feat add asio

3party/asio/COPYING

@@ -0,0 +1,4 @@
+Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+
+Distributed under the Boost Software License, Version 1.0. (See accompanying
+file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

3party/asio/INSTALL

@@ -0,0 +1,5 @@
+See doc/index.html for information on:
+  - External dependencies
+  - Using, building, and configuring Asio
+  - Supported platforms
+  - How to build the tests and examples

3party/asio/LICENSE_1_0.txt

@@ -0,0 +1,23 @@
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

3party/asio/Makefile.am

@@ -0,0 +1,21 @@
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+
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+	doc

3party/asio/Makefile.in

@@ -0,0 +1,845 @@
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+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
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+	test ! -s cscope.files \
+	  || $(CSCOPE) -b -q $(AM_CSCOPEFLAGS) $(CSCOPEFLAGS) -i cscope.files $(CSCOPE_ARGS)
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+
+cscopelist-am: $(am__tagged_files)
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+	-rm -f cscope.out cscope.in.out cscope.po.out cscope.files
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
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+	test -d "$(distdir)" || mkdir "$(distdir)"
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
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+		am__remove_distdir=: \
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+	-test -n "$(am__skip_mode_fix)" \
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+	  ! -type d ! -perm -444 -exec $(install_sh) -c -m a+r {} {} \; \
+	|| chmod -R a+r "$(distdir)"
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+	$(am__post_remove_distdir)
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+dist-tarZ: distdir
+	@echo WARNING: "Support for distribution archives compressed with" \
+		       "legacy program 'compress' is deprecated." >&2
+	@echo WARNING: "It will be removed altogether in Automake 2.0" >&2
+	tardir=$(distdir) && $(am__tar) | compress -c >$(distdir).tar.Z
+	$(am__post_remove_distdir)
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+dist-shar: distdir
+	@echo WARNING: "Support for shar distribution archives is" \
+	               "deprecated." >&2
+	@echo WARNING: "It will be removed altogether in Automake 2.0" >&2
+	shar $(distdir) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).shar.gz
+	$(am__post_remove_distdir)
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+	-rm -f $(distdir).zip
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+	$(am__post_remove_distdir)
+
+dist dist-all:
+	$(MAKE) $(AM_MAKEFLAGS) $(DIST_TARGETS) am__post_remove_distdir='@:'
+	$(am__post_remove_distdir)
+
+# This target untars the dist file and tries a VPATH configuration.  Then
+# it guarantees that the distribution is self-contained by making another
+# tarfile.
+distcheck: dist
+	case '$(DIST_ARCHIVES)' in \
+	*.tar.gz*) \
+	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).tar.gz | $(am__untar) ;;\
+	*.tar.bz2*) \
+	  bzip2 -dc $(distdir).tar.bz2 | $(am__untar) ;;\
+	*.tar.lz*) \
+	  lzip -dc $(distdir).tar.lz | $(am__untar) ;;\
+	*.tar.xz*) \
+	  xz -dc $(distdir).tar.xz | $(am__untar) ;;\
+	*.tar.Z*) \
+	  uncompress -c $(distdir).tar.Z | $(am__untar) ;;\
+	*.shar.gz*) \
+	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).shar.gz | unshar ;;\
+	*.zip*) \
+	  unzip $(distdir).zip ;;\
+	*.tar.zst*) \
+	  zstd -dc $(distdir).tar.zst | $(am__untar) ;;\
+	esac
+	chmod -R a-w $(distdir)
+	chmod u+w $(distdir)
+	mkdir $(distdir)/_build $(distdir)/_build/sub $(distdir)/_inst
+	chmod a-w $(distdir)
+	test -d $(distdir)/_build || exit 0; \
+	dc_install_base=`$(am__cd) $(distdir)/_inst && pwd | sed -e 's,^[^:\\/]:[\\/],/,'` \
+	  && dc_destdir="$${TMPDIR-/tmp}/am-dc-$$$$/" \
+	  && am__cwd=`pwd` \
+	  && $(am__cd) $(distdir)/_build/sub \
+	  && ../../configure \
+	    $(AM_DISTCHECK_CONFIGURE_FLAGS) \
+	    $(DISTCHECK_CONFIGURE_FLAGS) \
+	    --srcdir=../.. --prefix="$$dc_install_base" \
+	  && $(MAKE) $(AM_MAKEFLAGS) \
+	  && $(MAKE) $(AM_MAKEFLAGS) $(AM_DISTCHECK_DVI_TARGET) \
+	  && $(MAKE) $(AM_MAKEFLAGS) check \
+	  && $(MAKE) $(AM_MAKEFLAGS) install \
+	  && $(MAKE) $(AM_MAKEFLAGS) installcheck \
+	  && $(MAKE) $(AM_MAKEFLAGS) uninstall \
+	  && $(MAKE) $(AM_MAKEFLAGS) distuninstallcheck_dir="$$dc_install_base" \
+	        distuninstallcheck \
+	  && chmod -R a-w "$$dc_install_base" \
+	  && ({ \
+	       (cd ../.. && umask 077 && mkdir "$$dc_destdir") \
+	       && $(MAKE) $(AM_MAKEFLAGS) DESTDIR="$$dc_destdir" install \
+	       && $(MAKE) $(AM_MAKEFLAGS) DESTDIR="$$dc_destdir" uninstall \
+	       && $(MAKE) $(AM_MAKEFLAGS) DESTDIR="$$dc_destdir" \
+	            distuninstallcheck_dir="$$dc_destdir" distuninstallcheck; \
+	      } || { rm -rf "$$dc_destdir"; exit 1; }) \
+	  && rm -rf "$$dc_destdir" \
+	  && $(MAKE) $(AM_MAKEFLAGS) dist \
+	  && rm -rf $(DIST_ARCHIVES) \
+	  && $(MAKE) $(AM_MAKEFLAGS) distcleancheck \
+	  && cd "$$am__cwd" \
+	  || exit 1
+	$(am__post_remove_distdir)
+	@(echo "$(distdir) archives ready for distribution: "; \
+	  list='$(DIST_ARCHIVES)'; for i in $$list; do echo $$i; done) | \
+	  sed -e 1h -e 1s/./=/g -e 1p -e 1x -e '$$p' -e '$$x'
+distuninstallcheck:
+	@test -n '$(distuninstallcheck_dir)' || { \
+	  echo 'ERROR: trying to run $@ with an empty' \
+	       '$$(distuninstallcheck_dir)' >&2; \
+	  exit 1; \
+	}; \
+	$(am__cd) '$(distuninstallcheck_dir)' || { \
+	  echo 'ERROR: cannot chdir into $(distuninstallcheck_dir)' >&2; \
+	  exit 1; \
+	}; \
+	test `$(am__distuninstallcheck_listfiles) | wc -l` -eq 0 \
+	   || { echo "ERROR: files left after uninstall:" ; \
+	        if test -n "$(DESTDIR)"; then \
+	          echo "  (check DESTDIR support)"; \
+	        fi ; \
+	        $(distuninstallcheck_listfiles) ; \
+	        exit 1; } >&2
+distcleancheck: distclean
+	@if test '$(srcdir)' = . ; then \
+	  echo "ERROR: distcleancheck can only run from a VPATH build" ; \
+	  exit 1 ; \
+	fi
+	@test `$(distcleancheck_listfiles) | wc -l` -eq 0 \
+	  || { echo "ERROR: files left in build directory after distclean:" ; \
+	       $(distcleancheck_listfiles) ; \
+	       exit 1; } >&2
+check-am: all-am
+check: check-recursive
+all-am: Makefile $(DATA)
+installdirs: installdirs-recursive
+installdirs-am:
+	for dir in "$(DESTDIR)$(pkgconfigdir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
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+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-recursive
+
+clean-am: clean-generic mostlyclean-am
+
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+	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
+	-rm -f Makefile
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+
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+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
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+
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+
+install-dvi: install-dvi-recursive
+
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+
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+install-html: install-html-recursive
+
+install-html-am:
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+install-info: install-info-recursive
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+
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+	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
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+maintainer-clean-am: distclean-am maintainer-clean-generic
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+pdf: pdf-recursive
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+ps-am:
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+uninstall-am: uninstall-pkgconfigDATA
+
+.MAKE: $(am__recursive_targets) install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--refresh check check-am clean clean-cscope clean-generic \
+	cscope cscopelist-am ctags ctags-am dist dist-all dist-bzip2 \
+	dist-gzip dist-lzip dist-shar dist-tarZ dist-xz dist-zip \
+	dist-zstd distcheck distclean distclean-generic distclean-tags \
+	distcleancheck distdir distuninstallcheck dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-pkgconfigDATA install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs installdirs-am \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-generic pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am uninstall-pkgconfigDATA
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:

3party/asio/README

@@ -0,0 +1,4 @@
+asio version 1.28.0
+Released Wednesday, 26 April 2023.
+
+See doc/index.html for API documentation and a tutorial.

3party/asio/asio.pc.in

@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+includedir=@includedir@
+
+Name: @PACKAGE_NAME@
+Description: A cross-platform C++ library for network and low-level I/O programming that provides developers with a consistent asynchronous model using a modern C++ approach.
+Version: @PACKAGE_VERSION@
+Cflags: -I${includedir}
+Lflags:
+Requires:
+Requires.private:

3party/asio/compile

@@ -0,0 +1,348 @@
+#! /bin/sh
+# Wrapper for compilers which do not understand '-c -o'.
+
+scriptversion=2018-03-07.03; # UTC
+
+# Copyright (C) 1999-2021 Free Software Foundation, Inc.
+# Written by Tom Tromey <tromey@cygnus.com>.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that program.
+
+# This file is maintained in Automake, please report
+# bugs to <bug-automake@gnu.org> or send patches to
+# <automake-patches@gnu.org>.
+
+nl='
+'
+
+# We need space, tab and new line, in precisely that order.  Quoting is
+# there to prevent tools from complaining about whitespace usage.
+IFS=" ""	$nl"
+
+file_conv=
+
+# func_file_conv build_file lazy
+# Convert a $build file to $host form and store it in $file
+# Currently only supports Windows hosts. If the determined conversion
+# type is listed in (the comma separated) LAZY, no conversion will
+# take place.
+func_file_conv ()
+{
+  file=$1
+  case $file in
+    / | /[!/]*) # absolute file, and not a UNC file
+      if test -z "$file_conv"; then
+	# lazily determine how to convert abs files
+	case `uname -s` in
+	  MINGW*)
+	    file_conv=mingw
+	    ;;
+	  CYGWIN* | MSYS*)
+	    file_conv=cygwin
+	    ;;
+	  *)
+	    file_conv=wine
+	    ;;
+	esac
+      fi
+      case $file_conv/,$2, in
+	*,$file_conv,*)
+	  ;;
+	mingw/*)
+	  file=`cmd //C echo "$file " | sed -e 's/"\(.*\) " *$/\1/'`
+	  ;;
+	cygwin/* | msys/*)
+	  file=`cygpath -m "$file" || echo "$file"`
+	  ;;
+	wine/*)
+	  file=`winepath -w "$file" || echo "$file"`
+	  ;;
+      esac
+      ;;
+  esac
+}
+
+# func_cl_dashL linkdir
+# Make cl look for libraries in LINKDIR
+func_cl_dashL ()
+{
+  func_file_conv "$1"
+  if test -z "$lib_path"; then
+    lib_path=$file
+  else
+    lib_path="$lib_path;$file"
+  fi
+  linker_opts="$linker_opts -LIBPATH:$file"
+}
+
+# func_cl_dashl library
+# Do a library search-path lookup for cl
+func_cl_dashl ()
+{
+  lib=$1
+  found=no
+  save_IFS=$IFS
+  IFS=';'
+  for dir in $lib_path $LIB
+  do
+    IFS=$save_IFS
+    if $shared && test -f "$dir/$lib.dll.lib"; then
+      found=yes
+      lib=$dir/$lib.dll.lib
+      break
+    fi
+    if test -f "$dir/$lib.lib"; then
+      found=yes
+      lib=$dir/$lib.lib
+      break
+    fi
+    if test -f "$dir/lib$lib.a"; then
+      found=yes
+      lib=$dir/lib$lib.a
+      break
+    fi
+  done
+  IFS=$save_IFS
+
+  if test "$found" != yes; then
+    lib=$lib.lib
+  fi
+}
+
+# func_cl_wrapper cl arg...
+# Adjust compile command to suit cl
+func_cl_wrapper ()
+{
+  # Assume a capable shell
+  lib_path=
+  shared=:
+  linker_opts=
+  for arg
+  do
+    if test -n "$eat"; then
+      eat=
+    else
+      case $1 in
+	-o)
+	  # configure might choose to run compile as 'compile cc -o foo foo.c'.
+	  eat=1
+	  case $2 in
+	    *.o | *.[oO][bB][jJ])
+	      func_file_conv "$2"
+	      set x "$@" -Fo"$file"
+	      shift
+	      ;;
+	    *)
+	      func_file_conv "$2"
+	      set x "$@" -Fe"$file"
+	      shift
+	      ;;
+	  esac
+	  ;;
+	-I)
+	  eat=1
+	  func_file_conv "$2" mingw
+	  set x "$@" -I"$file"
+	  shift
+	  ;;
+	-I*)
+	  func_file_conv "${1#-I}" mingw
+	  set x "$@" -I"$file"
+	  shift
+	  ;;
+	-l)
+	  eat=1
+	  func_cl_dashl "$2"
+	  set x "$@" "$lib"
+	  shift
+	  ;;
+	-l*)
+	  func_cl_dashl "${1#-l}"
+	  set x "$@" "$lib"
+	  shift
+	  ;;
+	-L)
+	  eat=1
+	  func_cl_dashL "$2"
+	  ;;
+	-L*)
+	  func_cl_dashL "${1#-L}"
+	  ;;
+	-static)
+	  shared=false
+	  ;;
+	-Wl,*)
+	  arg=${1#-Wl,}
+	  save_ifs="$IFS"; IFS=','
+	  for flag in $arg; do
+	    IFS="$save_ifs"
+	    linker_opts="$linker_opts $flag"
+	  done
+	  IFS="$save_ifs"
+	  ;;
+	-Xlinker)
+	  eat=1
+	  linker_opts="$linker_opts $2"
+	  ;;
+	-*)
+	  set x "$@" "$1"
+	  shift
+	  ;;
+	*.cc | *.CC | *.cxx | *.CXX | *.[cC]++)
+	  func_file_conv "$1"
+	  set x "$@" -Tp"$file"
+	  shift
+	  ;;
+	*.c | *.cpp | *.CPP | *.lib | *.LIB | *.Lib | *.OBJ | *.obj | *.[oO])
+	  func_file_conv "$1" mingw
+	  set x "$@" "$file"
+	  shift
+	  ;;
+	*)
+	  set x "$@" "$1"
+	  shift
+	  ;;
+      esac
+    fi
+    shift
+  done
+  if test -n "$linker_opts"; then
+    linker_opts="-link$linker_opts"
+  fi
+  exec "$@" $linker_opts
+  exit 1
+}
+
+eat=
+
+case $1 in
+  '')
+     echo "$0: No command.  Try '$0 --help' for more information." 1>&2
+     exit 1;
+     ;;
+  -h | --h*)
+    cat <<\EOF
+Usage: compile [--help] [--version] PROGRAM [ARGS]
+
+Wrapper for compilers which do not understand '-c -o'.
+Remove '-o dest.o' from ARGS, run PROGRAM with the remaining
+arguments, and rename the output as expected.
+
+If you are trying to build a whole package this is not the
+right script to run: please start by reading the file 'INSTALL'.
+
+Report bugs to <bug-automake@gnu.org>.
+EOF
+    exit $?
+    ;;
+  -v | --v*)
+    echo "compile $scriptversion"
+    exit $?
+    ;;
+  cl | *[/\\]cl | cl.exe | *[/\\]cl.exe | \
+  icl | *[/\\]icl | icl.exe | *[/\\]icl.exe )
+    func_cl_wrapper "$@"      # Doesn't return...
+    ;;
+esac
+
+ofile=
+cfile=
+
+for arg
+do
+  if test -n "$eat"; then
+    eat=
+  else
+    case $1 in
+      -o)
+	# configure might choose to run compile as 'compile cc -o foo foo.c'.
+	# So we strip '-o arg' only if arg is an object.
+	eat=1
+	case $2 in
+	  *.o | *.obj)
+	    ofile=$2
+	    ;;
+	  *)
+	    set x "$@" -o "$2"
+	    shift
+	    ;;
+	esac
+	;;
+      *.c)
+	cfile=$1
+	set x "$@" "$1"
+	shift
+	;;
+      *)
+	set x "$@" "$1"
+	shift
+	;;
+    esac
+  fi
+  shift
+done
+
+if test -z "$ofile" || test -z "$cfile"; then
+  # If no '-o' option was seen then we might have been invoked from a
+  # pattern rule where we don't need one.  That is ok -- this is a
+  # normal compilation that the losing compiler can handle.  If no
+  # '.c' file was seen then we are probably linking.  That is also
+  # ok.
+  exec "$@"
+fi
+
+# Name of file we expect compiler to create.
+cofile=`echo "$cfile" | sed 's|^.*[\\/]||; s|^[a-zA-Z]:||; s/\.c$/.o/'`
+
+# Create the lock directory.
+# Note: use '[/\\:.-]' here to ensure that we don't use the same name
+# that we are using for the .o file.  Also, base the name on the expected
+# object file name, since that is what matters with a parallel build.
+lockdir=`echo "$cofile" | sed -e 's|[/\\:.-]|_|g'`.d
+while true; do
+  if mkdir "$lockdir" >/dev/null 2>&1; then
+    break
+  fi
+  sleep 1
+done
+# FIXME: race condition here if user kills between mkdir and trap.
+trap "rmdir '$lockdir'; exit 1" 1 2 15
+
+# Run the compile.
+"$@"
+ret=$?
+
+if test -f "$cofile"; then
+  test "$cofile" = "$ofile" || mv "$cofile" "$ofile"
+elif test -f "${cofile}bj"; then
+  test "${cofile}bj" = "$ofile" || mv "${cofile}bj" "$ofile"
+fi
+
+rmdir "$lockdir"
+exit $ret
+
+# Local Variables:
+# mode: shell-script
+# sh-indentation: 2
+# eval: (add-hook 'before-save-hook 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-time-zone: "UTC0"
+# time-stamp-end: "; # UTC"
+# End:

3party/asio/configure.ac

@@ -0,0 +1,259 @@
+AC_INIT(asio, [1.28.0])
+AC_CONFIG_SRCDIR(include/asio.hpp)
+AM_MAINTAINER_MODE
+AM_INIT_AUTOMAKE([tar-pax])
+
+AC_CANONICAL_HOST
+AM_PROG_CC_C_O
+AC_PROG_CXX
+AC_LANG(C++)
+AC_PROG_RANLIB
+PKG_INSTALLDIR
+
+AC_DEFINE(_REENTRANT, [1], [Define this])
+
+AC_ARG_WITH(boost,
+  AC_HELP_STRING([--with-boost=DIR],[location of boost distribution]),
+[
+  if test "${withval}" = no; then
+    STANDALONE="yes"
+  else
+    if test "${withval}" != system; then
+      CPPFLAGS="$CPPFLAGS -I${withval}"
+      LIBS="$LIBS -L${withval}/stage/lib"
+    fi
+    CPPFLAGS="$CPPFLAGS -DASIO_ENABLE_BOOST -DBOOST_CHRONO_HEADER_ONLY -DBOOST_CHRONO_DONT_PROVIDE_HYBRID_ERROR_HANDLING"
+  fi
+],
+[
+  STANDALONE="yes"
+])
+
+AC_ARG_ENABLE(separate-compilation,
+[  --enable-separate-compilation  separate compilation of asio source],
+[
+  SEPARATE_COMPILATION=yes
+])
+
+AC_ARG_ENABLE(boost-coroutine,
+[  --enable-boost-coroutine  use Boost.Coroutine to implement stackful coroutines],
+[
+  HAVE_BOOST_COROUTINE=yes
+])
+
+if test "$STANDALONE" != yes; then
+  AC_CHECK_HEADER([boost/noncopyable.hpp],,
+  [
+    echo "Can't find boost headers. Please check the location of the boost"
+    echo "distribution and rerun configure using the --with-boost=DIR option."
+    echo "Alternatively, run with --without-boost to enable standalone build."
+    exit 1
+  ],[])
+fi
+
+AC_ARG_WITH(openssl,
+  AC_HELP_STRING([--with-openssl=DIR],[location of openssl]),
+[
+  CPPFLAGS="$CPPFLAGS -I${withval}/include"
+  LIBS="$LIBS -L${withval}/lib"
+],[])
+
+AC_CHECK_HEADER([openssl/ssl.h],,
+[
+  OPENSSL_FOUND=no
+],[])
+
+if test x$OPENSSL_FOUND != xno; then
+  LIBS="$LIBS -lssl -lcrypto"
+fi
+
+AM_CONDITIONAL(HAVE_OPENSSL,test x$OPENSSL_FOUND != xno)
+
+WINDOWS=no
+case $host in
+  *-*-linux*)
+    CXXFLAGS="$CXXFLAGS -pthread"
+    LDFLAGS="$LDFLAGS -pthread"
+    LIBS="$LIBS -lrt"
+    ;;
+  *-*-solaris*)
+    if test "$GXX" = yes; then
+      CXXFLAGS="$CXXFLAGS -D_PTHREADS"
+    else
+      # We'll assume Sun's CC.
+      CXXFLAGS="$CXXFLAGS -mt"
+    fi
+    LIBS="$LIBS -lsocket -lnsl -lpthread"
+    ;;
+  *-*-mingw32*)
+    CXXFLAGS="$CXXFLAGS -mthreads"
+    LDFLAGS="$LDFLAGS -mthreads"
+    LIBS="$LIBS -lws2_32 -lmswsock"
+    WINDOWS=yes
+    ;;
+  *-*-mingw64*)
+    CXXFLAGS="$CXXFLAGS -mthreads"
+    LDFLAGS="$LDFLAGS -mthreads"
+    LIBS="$LIBS -lws2_32 -lmswsock"
+    WINDOWS=yes
+    ;;
+  *-pc-cygwin*)
+    CXXFLAGS="$CXXFLAGS -D__USE_W32_SOCKETS -D_WIN32_WINNT=0x0601"
+    LIBS="$LIBS -lws2_32 -lmswsock"
+    WINDOWS=yes
+    ;;
+  *-apple-darwin*)
+    CXXFLAGS="$CXXFLAGS"
+    LDFLAGS="$LDFLAGS"
+    ;;
+  *-*-freebsd*)
+    CXXFLAGS="$CXXFLAGS -pthread"
+    LDFLAGS="$LDFLAGS -pthread"
+    ;;
+  *-*-netbsd*)
+    CXXFLAGS="$CXXFLAGS -pthread"
+    LDFLAGS="$LDFLAGS -pthread"
+    ;;
+  *-*-haiku*)
+    CXXFLAGS="$CXXFLAGS -lnetwork"
+    LDFLAGS="$LDFLAGS -lnetwork"
+
+esac
+
+if test "$GXX" = yes; then
+  CXXFLAGS="$CXXFLAGS -ftemplate-depth-256"
+fi
+
+if test "$STANDALONE" = yes; then
+  CPPFLAGS="$CPPFLAGS -DASIO_STANDALONE"
+fi
+
+if test "$SEPARATE_COMPILATION" = yes; then
+  CPPFLAGS="$CPPFLAGS -DASIO_SEPARATE_COMPILATION"
+fi
+
+AC_MSG_CHECKING([whether C++11 is enabled])
+AC_COMPILE_IFELSE(
+  [AC_LANG_PROGRAM(
+    [[#if __cplusplus < 201103L]]
+    [[#error C++11 not available]]
+    [[#endif]])],
+  [AC_MSG_RESULT([yes])
+    HAVE_CXX11=yes;],
+  [AC_MSG_RESULT([no])
+    HAVE_CXX11=no;])
+
+AC_MSG_CHECKING([whether C++14 is enabled])
+AC_COMPILE_IFELSE(
+  [AC_LANG_PROGRAM(
+    [[#if defined(__GNUC__) && !defined(__clang__)]]
+    [[# if (__GNUC__ <= 6)]]
+    [[#  error C++14 support on this compiler not sufficiently compliant]]
+    [[# endif]]
+    [[#endif]]
+    [[#if __cplusplus < 201402L]]
+    [[#error C++14 not available]]
+    [[#endif]])],
+  [AC_MSG_RESULT([yes])
+    HAVE_CXX14=yes;],
+  [AC_MSG_RESULT([no])
+    HAVE_CXX14=no;])
+
+AC_MSG_CHECKING([whether C++17 is enabled])
+AC_COMPILE_IFELSE(
+  [AC_LANG_PROGRAM(
+    [[#if __cplusplus < 201703L]]
+    [[#error C++17 not available]]
+    [[#endif]])],
+  [AC_MSG_RESULT([yes])
+    HAVE_CXX17=yes;],
+  [AC_MSG_RESULT([no])
+    HAVE_CXX17=no;])
+
+AC_MSG_CHECKING([whether C++20 is enabled])
+AC_COMPILE_IFELSE(
+  [AC_LANG_PROGRAM(
+    [[#if __cplusplus < 202002L]]
+    [[#error C++20 not available]]
+    [[#endif]])],
+  [AC_MSG_RESULT([yes])
+    HAVE_CXX20=yes;],
+  [AC_MSG_RESULT([no])
+    HAVE_CXX20=no;])
+
+AC_MSG_CHECKING([whether coroutines are enabled])
+AC_COMPILE_IFELSE(
+  [AC_LANG_PROGRAM(
+    [[#if defined(__clang__)]]
+    [[# if (__clang_major__ >= 14)]]
+    [[#  if (__cplusplus >= 202002) && (__cpp_impl_coroutine >= 201902)]]
+    [[#   if __has_include(<coroutine>)]]
+    [[#    define ASIO_HAS_CO_AWAIT 1]]
+    [[#   endif]]
+    [[#  elif (__cplusplus >= 201703) && (__cpp_coroutines >= 201703)]]
+    [[#   if __has_include(<experimental/coroutine>)]]
+    [[#    define ASIO_HAS_CO_AWAIT 1]]
+    [[#   endif]]
+    [[#  endif]]
+    [[# else]]
+    [[#  if (__cplusplus >= 201703) && (__cpp_coroutines >= 201703)]]
+    [[#   if __has_include(<experimental/coroutine>)]]
+    [[#    define ASIO_HAS_CO_AWAIT 1]]
+    [[#   endif]]
+    [[#  endif]]
+    [[# endif]]
+    [[#elif defined(__GNUC__)]]
+    [[# if (__cplusplus >= 201709) && (__cpp_impl_coroutine >= 201902)]]
+    [[#  if __has_include(<coroutine>)]]
+    [[#   define ASIO_HAS_CO_AWAIT 1]]
+    [[#  endif]]
+    [[# endif]]
+    [[#endif]]
+    [[#ifndef ASIO_HAS_CO_AWAIT]]
+    [[# error coroutines not available]]
+    [[#endif]])],
+  [AC_MSG_RESULT([yes])
+    HAVE_COROUTINES=yes;],
+  [AC_MSG_RESULT([no])
+    HAVE_COROUTINES=no;])
+
+if test "$GXX" = yes; then
+  if test "$STANDALONE" = yes; then
+    if test "$HAVE_CXX11" = no; then
+      HAVE_CXX11=yes
+      CPPFLAGS="-std=c++0x $CPPFLAGS"
+    fi
+  fi
+fi
+
+AM_CONDITIONAL(STANDALONE,test x$STANDALONE = xyes)
+
+AM_CONDITIONAL(SEPARATE_COMPILATION,test x$SEPARATE_COMPILATION = xyes)
+
+AM_CONDITIONAL(HAVE_BOOST_COROUTINE,test x$HAVE_BOOST_COROUTINE = xyes)
+
+AM_CONDITIONAL(WINDOWS_TARGET,test x$WINDOWS != xno)
+
+AM_CONDITIONAL(HAVE_CXX11,test x$HAVE_CXX11 = xyes)
+
+AM_CONDITIONAL(HAVE_CXX14,test x$HAVE_CXX14 = xyes)
+
+AM_CONDITIONAL(HAVE_CXX17,test x$HAVE_CXX17 = xyes)
+
+AM_CONDITIONAL(HAVE_CXX20,test x$HAVE_CXX20 = xyes)
+
+AM_CONDITIONAL(HAVE_COROUTINES,test x$HAVE_COROUTINES = xyes)
+
+AC_CONFIG_FILES([asio.pc])
+
+AC_OUTPUT([
+  Makefile
+  include/Makefile
+  src/Makefile
+  src/tests/Makefile
+  src/tests/properties/Makefile
+  src/examples/cpp03/Makefile
+  src/examples/cpp11/Makefile
+  src/examples/cpp14/Makefile
+  src/examples/cpp17/Makefile
+  src/examples/cpp20/Makefile])

3party/asio/depcomp

@@ -0,0 +1,791 @@
+#! /bin/sh
+# depcomp - compile a program generating dependencies as side-effects
+
+scriptversion=2018-03-07.03; # UTC
+
+# Copyright (C) 1999-2021 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that program.
+
+# Originally written by Alexandre Oliva <oliva@dcc.unicamp.br>.
+
+case $1 in
+  '')
+    echo "$0: No command.  Try '$0 --help' for more information." 1>&2
+    exit 1;
+    ;;
+  -h | --h*)
+    cat <<\EOF
+Usage: depcomp [--help] [--version] PROGRAM [ARGS]
+
+Run PROGRAMS ARGS to compile a file, generating dependencies
+as side-effects.
+
+Environment variables:
+  depmode     Dependency tracking mode.
+  source      Source file read by 'PROGRAMS ARGS'.
+  object      Object file output by 'PROGRAMS ARGS'.
+  DEPDIR      directory where to store dependencies.
+  depfile     Dependency file to output.
+  tmpdepfile  Temporary file to use when outputting dependencies.
+  libtool     Whether libtool is used (yes/no).
+
+Report bugs to <bug-automake@gnu.org>.
+EOF
+    exit $?
+    ;;
+  -v | --v*)
+    echo "depcomp $scriptversion"
+    exit $?
+    ;;
+esac
+
+# Get the directory component of the given path, and save it in the
+# global variables '$dir'.  Note that this directory component will
+# be either empty or ending with a '/' character.  This is deliberate.
+set_dir_from ()
+{
+  case $1 in
+    */*) dir=`echo "$1" | sed -e 's|/[^/]*$|/|'`;;
+      *) dir=;;
+  esac
+}
+
+# Get the suffix-stripped basename of the given path, and save it the
+# global variable '$base'.
+set_base_from ()
+{
+  base=`echo "$1" | sed -e 's|^.*/||' -e 's/\.[^.]*$//'`
+}
+
+# If no dependency file was actually created by the compiler invocation,
+# we still have to create a dummy depfile, to avoid errors with the
+# Makefile "include basename.Plo" scheme.
+make_dummy_depfile ()
+{
+  echo "#dummy" > "$depfile"
+}
+
+# Factor out some common post-processing of the generated depfile.
+# Requires the auxiliary global variable '$tmpdepfile' to be set.
+aix_post_process_depfile ()
+{
+  # If the compiler actually managed to produce a dependency file,
+  # post-process it.
+  if test -f "$tmpdepfile"; then
+    # Each line is of the form 'foo.o: dependency.h'.
+    # Do two passes, one to just change these to
+    #   $object: dependency.h
+    # and one to simply output
+    #   dependency.h:
+    # which is needed to avoid the deleted-header problem.
+    { sed -e "s,^.*\.[$lower]*:,$object:," < "$tmpdepfile"
+      sed -e "s,^.*\.[$lower]*:[$tab ]*,," -e 's,$,:,' < "$tmpdepfile"
+    } > "$depfile"
+    rm -f "$tmpdepfile"
+  else
+    make_dummy_depfile
+  fi
+}
+
+# A tabulation character.
+tab='	'
+# A newline character.
+nl='
+'
+# Character ranges might be problematic outside the C locale.
+# These definitions help.
+upper=ABCDEFGHIJKLMNOPQRSTUVWXYZ
+lower=abcdefghijklmnopqrstuvwxyz
+digits=0123456789
+alpha=${upper}${lower}
+
+if test -z "$depmode" || test -z "$source" || test -z "$object"; then
+  echo "depcomp: Variables source, object and depmode must be set" 1>&2
+  exit 1
+fi
+
+# Dependencies for sub/bar.o or sub/bar.obj go into sub/.deps/bar.Po.
+depfile=${depfile-`echo "$object" |
+  sed 's|[^\\/]*$|'${DEPDIR-.deps}'/&|;s|\.\([^.]*\)$|.P\1|;s|Pobj$|Po|'`}
+tmpdepfile=${tmpdepfile-`echo "$depfile" | sed 's/\.\([^.]*\)$/.T\1/'`}
+
+rm -f "$tmpdepfile"
+
+# Avoid interferences from the environment.
+gccflag= dashmflag=
+
+# Some modes work just like other modes, but use different flags.  We
+# parameterize here, but still list the modes in the big case below,
+# to make depend.m4 easier to write.  Note that we *cannot* use a case
+# here, because this file can only contain one case statement.
+if test "$depmode" = hp; then
+  # HP compiler uses -M and no extra arg.
+  gccflag=-M
+  depmode=gcc
+fi
+
+if test "$depmode" = dashXmstdout; then
+  # This is just like dashmstdout with a different argument.
+  dashmflag=-xM
+  depmode=dashmstdout
+fi
+
+cygpath_u="cygpath -u -f -"
+if test "$depmode" = msvcmsys; then
+  # This is just like msvisualcpp but w/o cygpath translation.
+  # Just convert the backslash-escaped backslashes to single forward
+  # slashes to satisfy depend.m4
+  cygpath_u='sed s,\\\\,/,g'
+  depmode=msvisualcpp
+fi
+
+if test "$depmode" = msvc7msys; then
+  # This is just like msvc7 but w/o cygpath translation.
+  # Just convert the backslash-escaped backslashes to single forward
+  # slashes to satisfy depend.m4
+  cygpath_u='sed s,\\\\,/,g'
+  depmode=msvc7
+fi
+
+if test "$depmode" = xlc; then
+  # IBM C/C++ Compilers xlc/xlC can output gcc-like dependency information.
+  gccflag=-qmakedep=gcc,-MF
+  depmode=gcc
+fi
+
+case "$depmode" in
+gcc3)
+## gcc 3 implements dependency tracking that does exactly what
+## we want.  Yay!  Note: for some reason libtool 1.4 doesn't like
+## it if -MD -MP comes after the -MF stuff.  Hmm.
+## Unfortunately, FreeBSD c89 acceptance of flags depends upon
+## the command line argument order; so add the flags where they
+## appear in depend2.am.  Note that the slowdown incurred here
+## affects only configure: in makefiles, %FASTDEP% shortcuts this.
+  for arg
+  do
+    case $arg in
+    -c) set fnord "$@" -MT "$object" -MD -MP -MF "$tmpdepfile" "$arg" ;;
+    *)  set fnord "$@" "$arg" ;;
+    esac
+    shift # fnord
+    shift # $arg
+  done
+  "$@"
+  stat=$?
+  if test $stat -ne 0; then
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  mv "$tmpdepfile" "$depfile"
+  ;;
+
+gcc)
+## Note that this doesn't just cater to obsosete pre-3.x GCC compilers.
+## but also to in-use compilers like IMB xlc/xlC and the HP C compiler.
+## (see the conditional assignment to $gccflag above).
+## There are various ways to get dependency output from gcc.  Here's
+## why we pick this rather obscure method:
+## - Don't want to use -MD because we'd like the dependencies to end
+##   up in a subdir.  Having to rename by hand is ugly.
+##   (We might end up doing this anyway to support other compilers.)
+## - The DEPENDENCIES_OUTPUT environment variable makes gcc act like
+##   -MM, not -M (despite what the docs say).  Also, it might not be
+##   supported by the other compilers which use the 'gcc' depmode.
+## - Using -M directly means running the compiler twice (even worse
+##   than renaming).
+  if test -z "$gccflag"; then
+    gccflag=-MD,
+  fi
+  "$@" -Wp,"$gccflag$tmpdepfile"
+  stat=$?
+  if test $stat -ne 0; then
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  rm -f "$depfile"
+  echo "$object : \\" > "$depfile"
+  # The second -e expression handles DOS-style file names with drive
+  # letters.
+  sed -e 's/^[^:]*: / /' \
+      -e 's/^['$alpha']:\/[^:]*: / /' < "$tmpdepfile" >> "$depfile"
+## This next piece of magic avoids the "deleted header file" problem.
+## The problem is that when a header file which appears in a .P file
+## is deleted, the dependency causes make to die (because there is
+## typically no way to rebuild the header).  We avoid this by adding
+## dummy dependencies for each header file.  Too bad gcc doesn't do
+## this for us directly.
+## Some versions of gcc put a space before the ':'.  On the theory
+## that the space means something, we add a space to the output as
+## well.  hp depmode also adds that space, but also prefixes the VPATH
+## to the object.  Take care to not repeat it in the output.
+## Some versions of the HPUX 10.20 sed can't process this invocation
+## correctly.  Breaking it into two sed invocations is a workaround.
+  tr ' ' "$nl" < "$tmpdepfile" \
+    | sed -e 's/^\\$//' -e '/^$/d' -e "s|.*$object$||" -e '/:$/d' \
+    | sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+hp)
+  # This case exists only to let depend.m4 do its work.  It works by
+  # looking at the text of this script.  This case will never be run,
+  # since it is checked for above.
+  exit 1
+  ;;
+
+sgi)
+  if test "$libtool" = yes; then
+    "$@" "-Wp,-MDupdate,$tmpdepfile"
+  else
+    "$@" -MDupdate "$tmpdepfile"
+  fi
+  stat=$?
+  if test $stat -ne 0; then
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  rm -f "$depfile"
+
+  if test -f "$tmpdepfile"; then  # yes, the sourcefile depend on other files
+    echo "$object : \\" > "$depfile"
+    # Clip off the initial element (the dependent).  Don't try to be
+    # clever and replace this with sed code, as IRIX sed won't handle
+    # lines with more than a fixed number of characters (4096 in
+    # IRIX 6.2 sed, 8192 in IRIX 6.5).  We also remove comment lines;
+    # the IRIX cc adds comments like '#:fec' to the end of the
+    # dependency line.
+    tr ' ' "$nl" < "$tmpdepfile" \
+      | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' \
+      | tr "$nl" ' ' >> "$depfile"
+    echo >> "$depfile"
+    # The second pass generates a dummy entry for each header file.
+    tr ' ' "$nl" < "$tmpdepfile" \
+      | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' -e 's/$/:/' \
+      >> "$depfile"
+  else
+    make_dummy_depfile
+  fi
+  rm -f "$tmpdepfile"
+  ;;
+
+xlc)
+  # This case exists only to let depend.m4 do its work.  It works by
+  # looking at the text of this script.  This case will never be run,
+  # since it is checked for above.
+  exit 1
+  ;;
+
+aix)
+  # The C for AIX Compiler uses -M and outputs the dependencies
+  # in a .u file.  In older versions, this file always lives in the
+  # current directory.  Also, the AIX compiler puts '$object:' at the
+  # start of each line; $object doesn't have directory information.
+  # Version 6 uses the directory in both cases.
+  set_dir_from "$object"
+  set_base_from "$object"
+  if test "$libtool" = yes; then
+    tmpdepfile1=$dir$base.u
+    tmpdepfile2=$base.u
+    tmpdepfile3=$dir.libs/$base.u
+    "$@" -Wc,-M
+  else
+    tmpdepfile1=$dir$base.u
+    tmpdepfile2=$dir$base.u
+    tmpdepfile3=$dir$base.u
+    "$@" -M
+  fi
+  stat=$?
+  if test $stat -ne 0; then
+    rm -f "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3"
+    exit $stat
+  fi
+
+  for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3"
+  do
+    test -f "$tmpdepfile" && break
+  done
+  aix_post_process_depfile
+  ;;
+
+tcc)
+  # tcc (Tiny C Compiler) understand '-MD -MF file' since version 0.9.26
+  # FIXME: That version still under development at the moment of writing.
+  #        Make that this statement remains true also for stable, released
+  #        versions.
+  # It will wrap lines (doesn't matter whether long or short) with a
+  # trailing '\', as in:
+  #
+  #   foo.o : \
+  #    foo.c \
+  #    foo.h \
+  #
+  # It will put a trailing '\' even on the last line, and will use leading
+  # spaces rather than leading tabs (at least since its commit 0394caf7
+  # "Emit spaces for -MD").
+  "$@" -MD -MF "$tmpdepfile"
+  stat=$?
+  if test $stat -ne 0; then
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  rm -f "$depfile"
+  # Each non-empty line is of the form 'foo.o : \' or ' dep.h \'.
+  # We have to change lines of the first kind to '$object: \'.
+  sed -e "s|.*:|$object :|" < "$tmpdepfile" > "$depfile"
+  # And for each line of the second kind, we have to emit a 'dep.h:'
+  # dummy dependency, to avoid the deleted-header problem.
+  sed -n -e 's|^  *\(.*\) *\\$|\1:|p' < "$tmpdepfile" >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+## The order of this option in the case statement is important, since the
+## shell code in configure will try each of these formats in the order
+## listed in this file.  A plain '-MD' option would be understood by many
+## compilers, so we must ensure this comes after the gcc and icc options.
+pgcc)
+  # Portland's C compiler understands '-MD'.
+  # Will always output deps to 'file.d' where file is the root name of the
+  # source file under compilation, even if file resides in a subdirectory.
+  # The object file name does not affect the name of the '.d' file.
+  # pgcc 10.2 will output
+  #    foo.o: sub/foo.c sub/foo.h
+  # and will wrap long lines using '\' :
+  #    foo.o: sub/foo.c ... \
+  #     sub/foo.h ... \
+  #     ...
+  set_dir_from "$object"
+  # Use the source, not the object, to determine the base name, since
+  # that's sadly what pgcc will do too.
+  set_base_from "$source"
+  tmpdepfile=$base.d
+
+  # For projects that build the same source file twice into different object
+  # files, the pgcc approach of using the *source* file root name can cause
+  # problems in parallel builds.  Use a locking strategy to avoid stomping on
+  # the same $tmpdepfile.
+  lockdir=$base.d-lock
+  trap "
+    echo '$0: caught signal, cleaning up...' >&2
+    rmdir '$lockdir'
+    exit 1
+  " 1 2 13 15
+  numtries=100
+  i=$numtries
+  while test $i -gt 0; do
+    # mkdir is a portable test-and-set.
+    if mkdir "$lockdir" 2>/dev/null; then
+      # This process acquired the lock.
+      "$@" -MD
+      stat=$?
+      # Release the lock.
+      rmdir "$lockdir"
+      break
+    else
+      # If the lock is being held by a different process, wait
+      # until the winning process is done or we timeout.
+      while test -d "$lockdir" && test $i -gt 0; do
+        sleep 1
+        i=`expr $i - 1`
+      done
+    fi
+    i=`expr $i - 1`
+  done
+  trap - 1 2 13 15
+  if test $i -le 0; then
+    echo "$0: failed to acquire lock after $numtries attempts" >&2
+    echo "$0: check lockdir '$lockdir'" >&2
+    exit 1
+  fi
+
+  if test $stat -ne 0; then
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  rm -f "$depfile"
+  # Each line is of the form `foo.o: dependent.h',
+  # or `foo.o: dep1.h dep2.h \', or ` dep3.h dep4.h \'.
+  # Do two passes, one to just change these to
+  # `$object: dependent.h' and one to simply `dependent.h:'.
+  sed "s,^[^:]*:,$object :," < "$tmpdepfile" > "$depfile"
+  # Some versions of the HPUX 10.20 sed can't process this invocation
+  # correctly.  Breaking it into two sed invocations is a workaround.
+  sed 's,^[^:]*: \(.*\)$,\1,;s/^\\$//;/^$/d;/:$/d' < "$tmpdepfile" \
+    | sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+hp2)
+  # The "hp" stanza above does not work with aCC (C++) and HP's ia64
+  # compilers, which have integrated preprocessors.  The correct option
+  # to use with these is +Maked; it writes dependencies to a file named
+  # 'foo.d', which lands next to the object file, wherever that
+  # happens to be.
+  # Much of this is similar to the tru64 case; see comments there.
+  set_dir_from  "$object"
+  set_base_from "$object"
+  if test "$libtool" = yes; then
+    tmpdepfile1=$dir$base.d
+    tmpdepfile2=$dir.libs/$base.d
+    "$@" -Wc,+Maked
+  else
+    tmpdepfile1=$dir$base.d
+    tmpdepfile2=$dir$base.d
+    "$@" +Maked
+  fi
+  stat=$?
+  if test $stat -ne 0; then
+     rm -f "$tmpdepfile1" "$tmpdepfile2"
+     exit $stat
+  fi
+
+  for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2"
+  do
+    test -f "$tmpdepfile" && break
+  done
+  if test -f "$tmpdepfile"; then
+    sed -e "s,^.*\.[$lower]*:,$object:," "$tmpdepfile" > "$depfile"
+    # Add 'dependent.h:' lines.
+    sed -ne '2,${
+               s/^ *//
+               s/ \\*$//
+               s/$/:/
+               p
+             }' "$tmpdepfile" >> "$depfile"
+  else
+    make_dummy_depfile
+  fi
+  rm -f "$tmpdepfile" "$tmpdepfile2"
+  ;;
+
+tru64)
+  # The Tru64 compiler uses -MD to generate dependencies as a side
+  # effect.  'cc -MD -o foo.o ...' puts the dependencies into 'foo.o.d'.
+  # At least on Alpha/Redhat 6.1, Compaq CCC V6.2-504 seems to put
+  # dependencies in 'foo.d' instead, so we check for that too.
+  # Subdirectories are respected.
+  set_dir_from  "$object"
+  set_base_from "$object"
+
+  if test "$libtool" = yes; then
+    # Libtool generates 2 separate objects for the 2 libraries.  These
+    # two compilations output dependencies in $dir.libs/$base.o.d and
+    # in $dir$base.o.d.  We have to check for both files, because
+    # one of the two compilations can be disabled.  We should prefer
+    # $dir$base.o.d over $dir.libs/$base.o.d because the latter is
+    # automatically cleaned when .libs/ is deleted, while ignoring
+    # the former would cause a distcleancheck panic.
+    tmpdepfile1=$dir$base.o.d          # libtool 1.5
+    tmpdepfile2=$dir.libs/$base.o.d    # Likewise.
+    tmpdepfile3=$dir.libs/$base.d      # Compaq CCC V6.2-504
+    "$@" -Wc,-MD
+  else
+    tmpdepfile1=$dir$base.d
+    tmpdepfile2=$dir$base.d
+    tmpdepfile3=$dir$base.d
+    "$@" -MD
+  fi
+
+  stat=$?
+  if test $stat -ne 0; then
+    rm -f "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3"
+    exit $stat
+  fi
+
+  for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3"
+  do
+    test -f "$tmpdepfile" && break
+  done
+  # Same post-processing that is required for AIX mode.
+  aix_post_process_depfile
+  ;;
+
+msvc7)
+  if test "$libtool" = yes; then
+    showIncludes=-Wc,-showIncludes
+  else
+    showIncludes=-showIncludes
+  fi
+  "$@" $showIncludes > "$tmpdepfile"
+  stat=$?
+  grep -v '^Note: including file: ' "$tmpdepfile"
+  if test $stat -ne 0; then
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  rm -f "$depfile"
+  echo "$object : \\" > "$depfile"
+  # The first sed program below extracts the file names and escapes
+  # backslashes for cygpath.  The second sed program outputs the file
+  # name when reading, but also accumulates all include files in the
+  # hold buffer in order to output them again at the end.  This only
+  # works with sed implementations that can handle large buffers.
+  sed < "$tmpdepfile" -n '
+/^Note: including file:  *\(.*\)/ {
+  s//\1/
+  s/\\/\\\\/g
+  p
+}' | $cygpath_u | sort -u | sed -n '
+s/ /\\ /g
+s/\(.*\)/'"$tab"'\1 \\/p
+s/.\(.*\) \\/\1:/
+H
+$ {
+  s/.*/'"$tab"'/
+  G
+  p
+}' >> "$depfile"
+  echo >> "$depfile" # make sure the fragment doesn't end with a backslash
+  rm -f "$tmpdepfile"
+  ;;
+
+msvc7msys)
+  # This case exists only to let depend.m4 do its work.  It works by
+  # looking at the text of this script.  This case will never be run,
+  # since it is checked for above.
+  exit 1
+  ;;
+
+#nosideeffect)
+  # This comment above is used by automake to tell side-effect
+  # dependency tracking mechanisms from slower ones.
+
+dashmstdout)
+  # Important note: in order to support this mode, a compiler *must*
+  # always write the preprocessed file to stdout, regardless of -o.
+  "$@" || exit $?
+
+  # Remove the call to Libtool.
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+
+  # Remove '-o $object'.
+  IFS=" "
+  for arg
+  do
+    case $arg in
+    -o)
+      shift
+      ;;
+    $object)
+      shift
+      ;;
+    *)
+      set fnord "$@" "$arg"
+      shift # fnord
+      shift # $arg
+      ;;
+    esac
+  done
+
+  test -z "$dashmflag" && dashmflag=-M
+  # Require at least two characters before searching for ':'
+  # in the target name.  This is to cope with DOS-style filenames:
+  # a dependency such as 'c:/foo/bar' could be seen as target 'c' otherwise.
+  "$@" $dashmflag |
+    sed "s|^[$tab ]*[^:$tab ][^:][^:]*:[$tab ]*|$object: |" > "$tmpdepfile"
+  rm -f "$depfile"
+  cat < "$tmpdepfile" > "$depfile"
+  # Some versions of the HPUX 10.20 sed can't process this sed invocation
+  # correctly.  Breaking it into two sed invocations is a workaround.
+  tr ' ' "$nl" < "$tmpdepfile" \
+    | sed -e 's/^\\$//' -e '/^$/d' -e '/:$/d' \
+    | sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+dashXmstdout)
+  # This case only exists to satisfy depend.m4.  It is never actually
+  # run, as this mode is specially recognized in the preamble.
+  exit 1
+  ;;
+
+makedepend)
+  "$@" || exit $?
+  # Remove any Libtool call
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+  # X makedepend
+  shift
+  cleared=no eat=no
+  for arg
+  do
+    case $cleared in
+    no)
+      set ""; shift
+      cleared=yes ;;
+    esac
+    if test $eat = yes; then
+      eat=no
+      continue
+    fi
+    case "$arg" in
+    -D*|-I*)
+      set fnord "$@" "$arg"; shift ;;
+    # Strip any option that makedepend may not understand.  Remove
+    # the object too, otherwise makedepend will parse it as a source file.
+    -arch)
+      eat=yes ;;
+    -*|$object)
+      ;;
+    *)
+      set fnord "$@" "$arg"; shift ;;
+    esac
+  done
+  obj_suffix=`echo "$object" | sed 's/^.*\././'`
+  touch "$tmpdepfile"
+  ${MAKEDEPEND-makedepend} -o"$obj_suffix" -f"$tmpdepfile" "$@"
+  rm -f "$depfile"
+  # makedepend may prepend the VPATH from the source file name to the object.
+  # No need to regex-escape $object, excess matching of '.' is harmless.
+  sed "s|^.*\($object *:\)|\1|" "$tmpdepfile" > "$depfile"
+  # Some versions of the HPUX 10.20 sed can't process the last invocation
+  # correctly.  Breaking it into two sed invocations is a workaround.
+  sed '1,2d' "$tmpdepfile" \
+    | tr ' ' "$nl" \
+    | sed -e 's/^\\$//' -e '/^$/d' -e '/:$/d' \
+    | sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile" "$tmpdepfile".bak
+  ;;
+
+cpp)
+  # Important note: in order to support this mode, a compiler *must*
+  # always write the preprocessed file to stdout.
+  "$@" || exit $?
+
+  # Remove the call to Libtool.
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+
+  # Remove '-o $object'.
+  IFS=" "
+  for arg
+  do
+    case $arg in
+    -o)
+      shift
+      ;;
+    $object)
+      shift
+      ;;
+    *)
+      set fnord "$@" "$arg"
+      shift # fnord
+      shift # $arg
+      ;;
+    esac
+  done
+
+  "$@" -E \
+    | sed -n -e '/^# [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' \
+             -e '/^#line [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' \
+    | sed '$ s: \\$::' > "$tmpdepfile"
+  rm -f "$depfile"
+  echo "$object : \\" > "$depfile"
+  cat < "$tmpdepfile" >> "$depfile"
+  sed < "$tmpdepfile" '/^$/d;s/^ //;s/ \\$//;s/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+msvisualcpp)
+  # Important note: in order to support this mode, a compiler *must*
+  # always write the preprocessed file to stdout.
+  "$@" || exit $?
+
+  # Remove the call to Libtool.
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+
+  IFS=" "
+  for arg
+  do
+    case "$arg" in
+    -o)
+      shift
+      ;;
+    $object)
+      shift
+      ;;
+    "-Gm"|"/Gm"|"-Gi"|"/Gi"|"-ZI"|"/ZI")
+        set fnord "$@"
+        shift
+        shift
+        ;;
+    *)
+        set fnord "$@" "$arg"
+        shift
+        shift
+        ;;
+    esac
+  done
+  "$@" -E 2>/dev/null |
+  sed -n '/^#line [0-9][0-9]* "\([^"]*\)"/ s::\1:p' | $cygpath_u | sort -u > "$tmpdepfile"
+  rm -f "$depfile"
+  echo "$object : \\" > "$depfile"
+  sed < "$tmpdepfile" -n -e 's% %\\ %g' -e '/^\(.*\)$/ s::'"$tab"'\1 \\:p' >> "$depfile"
+  echo "$tab" >> "$depfile"
+  sed < "$tmpdepfile" -n -e 's% %\\ %g' -e '/^\(.*\)$/ s::\1\::p' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+msvcmsys)
+  # This case exists only to let depend.m4 do its work.  It works by
+  # looking at the text of this script.  This case will never be run,
+  # since it is checked for above.
+  exit 1
+  ;;
+
+none)
+  exec "$@"
+  ;;
+
+*)
+  echo "Unknown depmode $depmode" 1>&2
+  exit 1
+  ;;
+esac
+
+exit 0
+
+# Local Variables:
+# mode: shell-script
+# sh-indentation: 2
+# eval: (add-hook 'before-save-hook 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-time-zone: "UTC0"
+# time-stamp-end: "; # UTC"
+# End:

3party/asio/doc/asio/examples.html

@@ -0,0 +1,62 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Examples</title>
+<link rel="stylesheet" href="../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../index.html" title="Asio">
+<link rel="up" href="../index.html" title="Asio">
+<link rel="prev" href="tutorial/boost_bind.html" title="boost::bind">
+<link rel="next" href="examples/cpp03_examples.html" title="C++03 Examples">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="tutorial/boost_bind.html"><img src="../prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../home.png" alt="Home"></a><a accesskey="n" href="examples/cpp03_examples.html"><img src="../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h2 class="title" style="clear: both">
+<a name="asio.examples"></a><a class="link" href="examples.html" title="Examples">Examples</a>
+</h2></div></div></div>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+          <a class="link" href="examples/cpp03_examples.html" title="C++03 Examples">C++03 Examples</a>: Illustrates
+          the use of Asio using only C++03 language and library features. Where necessary,
+          the examples make use of selected Boost C++ libraries.
+        </li>
+<li class="listitem">
+          <a class="link" href="examples/cpp11_examples.html" title="C++11 Examples">C++11 Examples</a>: Contains
+          a limited set of the C++03 Asio examples, updated to use only C++11 library
+          and language facilities. These examples do not make direct use of Boost
+          C++ libraries. To show the changes between C++03 and C++11, these examples
+          include a diff between the C++03 and C++11 versions.
+        </li>
+<li class="listitem">
+          <a class="link" href="examples/cpp14_examples.html" title="C++14 Examples">C++14 Examples</a>: Contains
+          a limited set of the C++03 Asio examples, updated to use only C++14 library
+          and language facilities. These examples do not make direct use of Boost
+          C++ libraries.
+        </li>
+<li class="listitem">
+          <a class="link" href="examples/cpp17_examples.html" title="C++17 Examples">C++17 Examples</a>: Selected
+          examples illustrating C++17 usage in conjunction with Technical Specifications.
+        </li>
+<li class="listitem">
+          <a class="link" href="examples/cpp20_examples.html" title="C++20 Examples">C++20 Examples</a>: Selected
+          examples using C++20 language features.
+        </li>
+</ul></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="tutorial/boost_bind.html"><img src="../prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../home.png" alt="Home"></a><a accesskey="n" href="examples/cpp03_examples.html"><img src="../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/examples/cpp03_examples.html

@@ -0,0 +1,633 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>C++03 Examples</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../examples.html" title="Examples">
+<link rel="prev" href="../examples.html" title="Examples">
+<link rel="next" href="cpp11_examples.html" title="C++11 Examples">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../examples.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../examples.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="cpp11_examples.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.examples.cpp03_examples"></a><a class="link" href="cpp03_examples.html" title="C++03 Examples">C++03 Examples</a>
+</h3></div></div></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h0"></a>
+        <span><a name="asio.examples.cpp03_examples.allocation"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.allocation">Allocation</a>
+      </h5>
+<p>
+        This example shows how to customise the allocation of memory associated with
+        asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp03/allocation/server.cpp" target="_top">../src/examples/cpp03/allocation/server.cpp</a>
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h1"></a>
+        <span><a name="asio.examples.cpp03_examples.buffers"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.buffers">Buffers</a>
+      </h5>
+<p>
+        This example demonstrates how to create reference counted buffers that can
+        be used with socket read and write operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp03/buffers/reference_counted.cpp" target="_top">../src/examples/cpp03/buffers/reference_counted.cpp</a>
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h2"></a>
+        <span><a name="asio.examples.cpp03_examples.chat"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.chat">Chat</a>
+      </h5>
+<p>
+        This example implements a chat server and client. The programs use a custom
+        protocol with a fixed length message header and variable length message body.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/chat/chat_message.hpp" target="_top">../src/examples/cpp03/chat/chat_message.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/chat/chat_client.cpp" target="_top">../src/examples/cpp03/chat/chat_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/chat/chat_server.cpp" target="_top">../src/examples/cpp03/chat/chat_server.cpp</a>
+          </li>
+</ul></div>
+<p>
+        The following POSIX-specific chat client demonstrates how to use the <a class="link" href="../reference/posix__stream_descriptor.html" title="posix::stream_descriptor">posix::stream_descriptor</a>
+        class to perform console input and output.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp03/chat/posix_chat_client.cpp" target="_top">../src/examples/cpp03/chat/posix_chat_client.cpp</a>
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h3"></a>
+        <span><a name="asio.examples.cpp03_examples.echo"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.echo">Echo</a>
+      </h5>
+<p>
+        A collection of simple clients and servers, showing the use of both synchronous
+        and asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/echo/async_tcp_echo_server.cpp" target="_top">../src/examples/cpp03/echo/async_tcp_echo_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/echo/async_udp_echo_server.cpp" target="_top">../src/examples/cpp03/echo/async_udp_echo_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/echo/blocking_tcp_echo_client.cpp" target="_top">../src/examples/cpp03/echo/blocking_tcp_echo_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/echo/blocking_tcp_echo_server.cpp" target="_top">../src/examples/cpp03/echo/blocking_tcp_echo_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/echo/blocking_udp_echo_client.cpp" target="_top">../src/examples/cpp03/echo/blocking_udp_echo_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/echo/blocking_udp_echo_server.cpp" target="_top">../src/examples/cpp03/echo/blocking_udp_echo_server.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h4"></a>
+        <span><a name="asio.examples.cpp03_examples.fork"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.fork">Fork</a>
+      </h5>
+<p>
+        These POSIX-specific examples show how to use Asio in conjunction with the
+        <code class="computeroutput"><span class="identifier">fork</span><span class="special">()</span></code>
+        system call. The first example illustrates the steps required to start a
+        daemon process:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp03/fork/daemon.cpp" target="_top">../src/examples/cpp03/fork/daemon.cpp</a>
+          </li></ul></div>
+<p>
+        The second example demonstrates how it is possible to fork a process from
+        within a completion handler.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp03/fork/process_per_connection.cpp" target="_top">../src/examples/cpp03/fork/process_per_connection.cpp</a>
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h5"></a>
+        <span><a name="asio.examples.cpp03_examples.http_client"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.http_client">HTTP
+        Client</a>
+      </h5>
+<p>
+        Example programs implementing simple HTTP 1.0 clients. These examples show
+        how to use the <a class="link" href="../reference/read_until.html" title="read_until">read_until</a>
+        and <a class="link" href="../reference/async_read_until.html" title="async_read_until">async_read_until</a>
+        functions.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/client/sync_client.cpp" target="_top">../src/examples/cpp03/http/client/sync_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/client/async_client.cpp" target="_top">../src/examples/cpp03/http/client/async_client.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h6"></a>
+        <span><a name="asio.examples.cpp03_examples.http_server"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.http_server">HTTP
+        Server</a>
+      </h5>
+<p>
+        This example illustrates the use of asio in a simple single-threaded server
+        implementation of HTTP 1.0. It demonstrates how to perform a clean shutdown
+        by cancelling all outstanding asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/connection.cpp" target="_top">../src/examples/cpp03/http/server/connection.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/connection.hpp" target="_top">../src/examples/cpp03/http/server/connection.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/connection_manager.cpp" target="_top">../src/examples/cpp03/http/server/connection_manager.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/connection_manager.hpp" target="_top">../src/examples/cpp03/http/server/connection_manager.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/header.hpp" target="_top">../src/examples/cpp03/http/server/header.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/main.cpp" target="_top">../src/examples/cpp03/http/server/main.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/mime_types.cpp" target="_top">../src/examples/cpp03/http/server/mime_types.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/mime_types.hpp" target="_top">../src/examples/cpp03/http/server/mime_types.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/reply.cpp" target="_top">../src/examples/cpp03/http/server/reply.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/reply.hpp" target="_top">../src/examples/cpp03/http/server/reply.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/request.hpp" target="_top">../src/examples/cpp03/http/server/request.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/request_handler.cpp" target="_top">../src/examples/cpp03/http/server/request_handler.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/request_handler.hpp" target="_top">../src/examples/cpp03/http/server/request_handler.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/request_parser.cpp" target="_top">../src/examples/cpp03/http/server/request_parser.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/request_parser.hpp" target="_top">../src/examples/cpp03/http/server/request_parser.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/server.cpp" target="_top">../src/examples/cpp03/http/server/server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server/server.hpp" target="_top">../src/examples/cpp03/http/server/server.hpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h7"></a>
+        <span><a name="asio.examples.cpp03_examples.http_server_2"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.http_server_2">HTTP
+        Server 2</a>
+      </h5>
+<p>
+        An HTTP server using an io_context-per-CPU design.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/connection.cpp" target="_top">../src/examples/cpp03/http/server2/connection.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/connection.hpp" target="_top">../src/examples/cpp03/http/server2/connection.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/header.hpp" target="_top">../src/examples/cpp03/http/server2/header.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/io_context_pool.cpp" target="_top">../src/examples/cpp03/http/server2/io_context_pool.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/io_context_pool.hpp" target="_top">../src/examples/cpp03/http/server2/io_context_pool.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/main.cpp" target="_top">../src/examples/cpp03/http/server2/main.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/mime_types.cpp" target="_top">../src/examples/cpp03/http/server2/mime_types.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/mime_types.hpp" target="_top">../src/examples/cpp03/http/server2/mime_types.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/reply.cpp" target="_top">../src/examples/cpp03/http/server2/reply.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/reply.hpp" target="_top">../src/examples/cpp03/http/server2/reply.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/request.hpp" target="_top">../src/examples/cpp03/http/server2/request.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/request_handler.cpp" target="_top">../src/examples/cpp03/http/server2/request_handler.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/request_handler.hpp" target="_top">../src/examples/cpp03/http/server2/request_handler.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/request_parser.cpp" target="_top">../src/examples/cpp03/http/server2/request_parser.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/request_parser.hpp" target="_top">../src/examples/cpp03/http/server2/request_parser.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/server.cpp" target="_top">../src/examples/cpp03/http/server2/server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server2/server.hpp" target="_top">../src/examples/cpp03/http/server2/server.hpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h8"></a>
+        <span><a name="asio.examples.cpp03_examples.http_server_3"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.http_server_3">HTTP
+        Server 3</a>
+      </h5>
+<p>
+        An HTTP server using a single io_context and a thread pool calling <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/connection.cpp" target="_top">../src/examples/cpp03/http/server3/connection.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/connection.hpp" target="_top">../src/examples/cpp03/http/server3/connection.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/header.hpp" target="_top">../src/examples/cpp03/http/server3/header.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/main.cpp" target="_top">../src/examples/cpp03/http/server3/main.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/mime_types.cpp" target="_top">../src/examples/cpp03/http/server3/mime_types.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/mime_types.hpp" target="_top">../src/examples/cpp03/http/server3/mime_types.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/reply.cpp" target="_top">../src/examples/cpp03/http/server3/reply.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/reply.hpp" target="_top">../src/examples/cpp03/http/server3/reply.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/request.hpp" target="_top">../src/examples/cpp03/http/server3/request.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/request_handler.cpp" target="_top">../src/examples/cpp03/http/server3/request_handler.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/request_handler.hpp" target="_top">../src/examples/cpp03/http/server3/request_handler.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/request_parser.cpp" target="_top">../src/examples/cpp03/http/server3/request_parser.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/request_parser.hpp" target="_top">../src/examples/cpp03/http/server3/request_parser.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/server.cpp" target="_top">../src/examples/cpp03/http/server3/server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server3/server.hpp" target="_top">../src/examples/cpp03/http/server3/server.hpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h9"></a>
+        <span><a name="asio.examples.cpp03_examples.http_server_4"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.http_server_4">HTTP
+        Server 4</a>
+      </h5>
+<p>
+        A single-threaded HTTP server implemented using stackless coroutines.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/file_handler.cpp" target="_top">../src/examples/cpp03/http/server4/file_handler.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/file_handler.hpp" target="_top">../src/examples/cpp03/http/server4/file_handler.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/header.hpp" target="_top">../src/examples/cpp03/http/server4/header.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/main.cpp" target="_top">../src/examples/cpp03/http/server4/main.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/mime_types.cpp" target="_top">../src/examples/cpp03/http/server4/mime_types.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/mime_types.hpp" target="_top">../src/examples/cpp03/http/server4/mime_types.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/reply.cpp" target="_top">../src/examples/cpp03/http/server4/reply.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/reply.hpp" target="_top">../src/examples/cpp03/http/server4/reply.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/request.hpp" target="_top">../src/examples/cpp03/http/server4/request.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/request_parser.cpp" target="_top">../src/examples/cpp03/http/server4/request_parser.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/request_parser.hpp" target="_top">../src/examples/cpp03/http/server4/request_parser.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/server.cpp" target="_top">../src/examples/cpp03/http/server4/server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/http/server4/server.hpp" target="_top">../src/examples/cpp03/http/server4/server.hpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h10"></a>
+        <span><a name="asio.examples.cpp03_examples.icmp"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.icmp">ICMP</a>
+      </h5>
+<p>
+        This example shows how to use raw sockets with ICMP to ping a remote host.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/icmp/ping.cpp" target="_top">../src/examples/cpp03/icmp/ping.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/icmp/ipv4_header.hpp" target="_top">../src/examples/cpp03/icmp/ipv4_header.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/icmp/icmp_header.hpp" target="_top">../src/examples/cpp03/icmp/icmp_header.hpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h11"></a>
+        <span><a name="asio.examples.cpp03_examples.invocation"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.invocation">Invocation</a>
+      </h5>
+<p>
+        This example shows how to customise handler invocation. Completion handlers
+        are added to a priority queue rather than executed immediately.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp03/invocation/prioritised_handlers.cpp" target="_top">../src/examples/cpp03/invocation/prioritised_handlers.cpp</a>
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h12"></a>
+        <span><a name="asio.examples.cpp03_examples.iostreams"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.iostreams">Iostreams</a>
+      </h5>
+<p>
+        Two examples showing how to use <a class="link" href="../reference/ip__tcp/iostream.html" title="ip::tcp::iostream">ip::tcp::iostream</a>.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/iostreams/daytime_client.cpp" target="_top">../src/examples/cpp03/iostreams/daytime_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/iostreams/daytime_server.cpp" target="_top">../src/examples/cpp03/iostreams/daytime_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/iostreams/http_client.cpp" target="_top">../src/examples/cpp03/iostreams/http_client.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h13"></a>
+        <span><a name="asio.examples.cpp03_examples.multicast"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.multicast">Multicast</a>
+      </h5>
+<p>
+        An example showing the use of multicast to transmit packets to a group of
+        subscribers.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/multicast/receiver.cpp" target="_top">../src/examples/cpp03/multicast/receiver.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/multicast/sender.cpp" target="_top">../src/examples/cpp03/multicast/sender.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h14"></a>
+        <span><a name="asio.examples.cpp03_examples.serialization"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.serialization">Serialization</a>
+      </h5>
+<p>
+        This example shows how Boost.Serialization can be used with asio to encode
+        and decode structures for transmission over a socket.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/serialization/client.cpp" target="_top">../src/examples/cpp03/serialization/client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/serialization/connection.hpp" target="_top">../src/examples/cpp03/serialization/connection.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/serialization/server.cpp" target="_top">../src/examples/cpp03/serialization/server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/serialization/stock.hpp" target="_top">../src/examples/cpp03/serialization/stock.hpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h15"></a>
+        <span><a name="asio.examples.cpp03_examples.services"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.services">Services</a>
+      </h5>
+<p>
+        This example demonstrates how to integrate custom functionality (in this
+        case, for logging) into asio's <a class="link" href="../reference/io_context.html" title="io_context">io_context</a>,
+        and how to use a custom service with <a class="link" href="../reference/basic_stream_socket.html" title="basic_stream_socket">basic_stream_socket&lt;&gt;</a>.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/services/basic_logger.hpp" target="_top">../src/examples/cpp03/services/basic_logger.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/services/daytime_client.cpp" target="_top">../src/examples/cpp03/services/daytime_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/services/logger.hpp" target="_top">../src/examples/cpp03/services/logger.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/services/logger_service.cpp" target="_top">../src/examples/cpp03/services/logger_service.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/services/logger_service.hpp" target="_top">../src/examples/cpp03/services/logger_service.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/services/stream_socket_service.hpp" target="_top">../src/examples/cpp03/services/stream_socket_service.hpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h16"></a>
+        <span><a name="asio.examples.cpp03_examples.socks_4"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.socks_4">SOCKS
+        4</a>
+      </h5>
+<p>
+        Example client program implementing the SOCKS 4 protocol for communication
+        via a proxy.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/socks4/sync_client.cpp" target="_top">../src/examples/cpp03/socks4/sync_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/socks4/socks4.hpp" target="_top">../src/examples/cpp03/socks4/socks4.hpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h17"></a>
+        <span><a name="asio.examples.cpp03_examples.ssl"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.ssl">SSL</a>
+      </h5>
+<p>
+        Example client and server programs showing the use of the <a class="link" href="../reference/ssl__stream.html" title="ssl::stream">ssl::stream&lt;&gt;</a>
+        template with asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/ssl/client.cpp" target="_top">../src/examples/cpp03/ssl/client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/ssl/server.cpp" target="_top">../src/examples/cpp03/ssl/server.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h18"></a>
+        <span><a name="asio.examples.cpp03_examples.timeouts"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.timeouts">Timeouts</a>
+      </h5>
+<p>
+        A collection of examples showing how to cancel long running asynchronous
+        operations after a period of time.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/timeouts/async_tcp_client.cpp" target="_top">../src/examples/cpp03/timeouts/async_tcp_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/timeouts/blocking_tcp_client.cpp" target="_top">../src/examples/cpp03/timeouts/blocking_tcp_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/timeouts/blocking_token_tcp_client.cpp" target="_top">../src/examples/cpp03/timeouts/blocking_token_tcp_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/timeouts/blocking_udp_client.cpp" target="_top">../src/examples/cpp03/timeouts/blocking_udp_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/timeouts/server.cpp" target="_top">../src/examples/cpp03/timeouts/server.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h19"></a>
+        <span><a name="asio.examples.cpp03_examples.timers"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.timers">Timers</a>
+      </h5>
+<p>
+        Example showing how to customise basic_waitable_timer using a different clock
+        type.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp03/timers/time_t_timer.cpp" target="_top">../src/examples/cpp03/timers/time_t_timer.cpp</a>
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h20"></a>
+        <span><a name="asio.examples.cpp03_examples.porthopper"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.porthopper">Porthopper</a>
+      </h5>
+<p>
+        Example illustrating mixed synchronous and asynchronous operations, and how
+        to use Boost.Lambda with Asio.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/porthopper/protocol.hpp" target="_top">../src/examples/cpp03/porthopper/protocol.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/porthopper/client.cpp" target="_top">../src/examples/cpp03/porthopper/client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/porthopper/server.cpp" target="_top">../src/examples/cpp03/porthopper/server.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h21"></a>
+        <span><a name="asio.examples.cpp03_examples.nonblocking"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.nonblocking">Nonblocking</a>
+      </h5>
+<p>
+        Example demonstrating reactor-style operations for integrating a third-party
+        library that wants to perform the I/O operations itself.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp03/nonblocking/third_party_lib.cpp" target="_top">../src/examples/cpp03/nonblocking/third_party_lib.cpp</a>
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h22"></a>
+        <span><a name="asio.examples.cpp03_examples.spawn"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.spawn">Spawn</a>
+      </h5>
+<p>
+        Example of using the asio::spawn() function, a wrapper around the <a href="http://www.boost.org/doc/libs/release/libs/coroutine/index.html" target="_top">Boost.Coroutine</a>
+        library, to implement a chain of asynchronous operations using stackful coroutines.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp03/spawn/echo_server.cpp" target="_top">../src/examples/cpp03/spawn/echo_server.cpp</a>
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h23"></a>
+        <span><a name="asio.examples.cpp03_examples.unix_domain_sockets"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.unix_domain_sockets">UNIX
+        Domain Sockets</a>
+      </h5>
+<p>
+        Examples showing how to use UNIX domain (local) sockets.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/local/connect_pair.cpp" target="_top">../src/examples/cpp03/local/connect_pair.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/local/iostream_client.cpp" target="_top">../src/examples/cpp03/local/iostream_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/local/stream_server.cpp" target="_top">../src/examples/cpp03/local/stream_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp03/local/stream_client.cpp" target="_top">../src/examples/cpp03/local/stream_client.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp03_examples.h24"></a>
+        <span><a name="asio.examples.cpp03_examples.windows"></a></span><a class="link" href="cpp03_examples.html#asio.examples.cpp03_examples.windows">Windows</a>
+      </h5>
+<p>
+        An example showing how to use the Windows-specific function <code class="computeroutput"><span class="identifier">TransmitFile</span></code> with Asio.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp03/windows/transmit_file.cpp" target="_top">../src/examples/cpp03/windows/transmit_file.cpp</a>
+          </li></ul></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../examples.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../examples.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="cpp11_examples.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/examples/cpp11_examples.html

@@ -0,0 +1,524 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>C++11 Examples</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../examples.html" title="Examples">
+<link rel="prev" href="cpp03_examples.html" title="C++03 Examples">
+<link rel="next" href="cpp14_examples.html" title="C++14 Examples">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cpp03_examples.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../examples.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="cpp14_examples.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.examples.cpp11_examples"></a><a class="link" href="cpp11_examples.html" title="C++11 Examples">C++11 Examples</a>
+</h3></div></div></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h0"></a>
+        <span><a name="asio.examples.cpp11_examples.allocation"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.allocation">Allocation</a>
+      </h5>
+<p>
+        This example shows how to customise the allocation of memory associated with
+        asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp11/allocation/server.cpp" target="_top">../src/examples/cpp11/allocation/server.cpp</a>
+            (<a href="../../examples/diffs/allocation/server.cpp.html" target="_top">diff to C++03</a>)
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h1"></a>
+        <span><a name="asio.examples.cpp11_examples.buffers"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.buffers">Buffers</a>
+      </h5>
+<p>
+        This example demonstrates how to create reference counted buffers that can
+        be used with socket read and write operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp11/buffers/reference_counted.cpp" target="_top">../src/examples/cpp11/buffers/reference_counted.cpp</a>
+            (<a href="../../examples/diffs/buffers/reference_counted.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h2"></a>
+        <span><a name="asio.examples.cpp11_examples.chat"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.chat">Chat</a>
+      </h5>
+<p>
+        This example implements a chat server and client. The programs use a custom
+        protocol with a fixed length message header and variable length message body.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/chat/chat_message.hpp" target="_top">../src/examples/cpp11/chat/chat_message.hpp</a>
+            (<a href="../../examples/diffs/chat/chat_message.hpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/chat/chat_client.cpp" target="_top">../src/examples/cpp11/chat/chat_client.cpp</a>
+            (<a href="../../examples/diffs/chat/chat_client.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/chat/chat_server.cpp" target="_top">../src/examples/cpp11/chat/chat_server.cpp</a>
+            (<a href="../../examples/diffs/chat/chat_server.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h3"></a>
+        <span><a name="asio.examples.cpp11_examples.echo"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.echo">Echo</a>
+      </h5>
+<p>
+        A collection of simple clients and servers, showing the use of both synchronous
+        and asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/echo/async_tcp_echo_server.cpp" target="_top">../src/examples/cpp11/echo/async_tcp_echo_server.cpp</a>
+            (<a href="../../examples/diffs/echo/async_tcp_echo_server.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/echo/async_udp_echo_server.cpp" target="_top">../src/examples/cpp11/echo/async_udp_echo_server.cpp</a>
+            (<a href="../../examples/diffs/echo/async_udp_echo_server.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/echo/blocking_tcp_echo_client.cpp" target="_top">../src/examples/cpp11/echo/blocking_tcp_echo_client.cpp</a>
+            (<a href="../../examples/diffs/echo/blocking_tcp_echo_client.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/echo/blocking_tcp_echo_server.cpp" target="_top">../src/examples/cpp11/echo/blocking_tcp_echo_server.cpp</a>
+            (<a href="../../examples/diffs/echo/blocking_tcp_echo_server.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/echo/blocking_udp_echo_client.cpp" target="_top">../src/examples/cpp11/echo/blocking_udp_echo_client.cpp</a>
+            (<a href="../../examples/diffs/echo/blocking_udp_echo_client.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/echo/blocking_udp_echo_server.cpp" target="_top">../src/examples/cpp11/echo/blocking_udp_echo_server.cpp</a>
+            (<a href="../../examples/diffs/echo/blocking_udp_echo_server.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h4"></a>
+        <span><a name="asio.examples.cpp11_examples.deferred"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.deferred">Deferred</a>
+      </h5>
+<p>
+        Examples showing how to use the <a class="link" href="../reference/deferred.html" title="deferred"><code class="computeroutput"><span class="identifier">deferred</span></code></a> completion token.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/deferred/deferred_1.cpp" target="_top">../src/examples/cpp11/deferred/deferred_1.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/deferred/deferred_2.cpp" target="_top">../src/examples/cpp11/deferred/deferred_2.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h5"></a>
+        <span><a name="asio.examples.cpp11_examples.fork"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.fork">Fork</a>
+      </h5>
+<p>
+        These POSIX-specific examples show how to use Asio in conjunction with the
+        <code class="computeroutput"><span class="identifier">fork</span><span class="special">()</span></code>
+        system call. The first example illustrates the steps required to start a
+        daemon process:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp11/fork/daemon.cpp" target="_top">../src/examples/cpp11/fork/daemon.cpp</a>
+            (<a href="../../examples/diffs/fork/daemon.cpp.html" target="_top">diff to C++03</a>)
+          </li></ul></div>
+<p>
+        The second example demonstrates how it is possible to fork a process from
+        within a completion handler.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp11/fork/process_per_connection.cpp" target="_top">../src/examples/cpp11/fork/process_per_connection.cpp</a>
+            (<a href="../../examples/diffs/fork/process_per_connection.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h6"></a>
+        <span><a name="asio.examples.cpp11_examples.futures"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.futures">Futures</a>
+      </h5>
+<p>
+        This example demonstrates how to use std::future in conjunction with Asio's
+        asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp11/futures/daytime_client.cpp" target="_top">../src/examples/cpp11/futures/daytime_client.cpp</a>
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h7"></a>
+        <span><a name="asio.examples.cpp11_examples.handler_tracking"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.handler_tracking">Handler
+        Tracking</a>
+      </h5>
+<p>
+        This example header file shows how to implement custom handler tracking.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp11/handler_tracking/custom_tracking.hpp" target="_top">../src/examples/cpp11/handler_tracking/custom_tracking.hpp</a>
+          </li></ul></div>
+<p>
+        This example program shows how to include source location information in
+        the handler tracking output.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp11/handler_tracking/async_tcp_echo_server.cpp" target="_top">../src/examples/cpp11/handler_tracking/async_tcp_echo_server.cpp</a>
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h8"></a>
+        <span><a name="asio.examples.cpp11_examples.http_server"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.http_server">HTTP
+        Server</a>
+      </h5>
+<p>
+        This example illustrates the use of asio in a simple single-threaded server
+        implementation of HTTP 1.0. It demonstrates how to perform a clean shutdown
+        by cancelling all outstanding asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/connection.cpp" target="_top">../src/examples/cpp11/http/server/connection.cpp</a>
+            (<a href="../../examples/diffs/http/server/connection.cpp.html" target="_top">diff to
+            C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/connection.hpp" target="_top">../src/examples/cpp11/http/server/connection.hpp</a>
+            (<a href="../../examples/diffs/http/server/connection.hpp.html" target="_top">diff to
+            C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/connection_manager.cpp" target="_top">../src/examples/cpp11/http/server/connection_manager.cpp</a>
+            (<a href="../../examples/diffs/http/server/connection_manager.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/connection_manager.hpp" target="_top">../src/examples/cpp11/http/server/connection_manager.hpp</a>
+            (<a href="../../examples/diffs/http/server/connection_manager.hpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/header.hpp" target="_top">../src/examples/cpp11/http/server/header.hpp</a>
+            (<a href="../../examples/diffs/http/server/header.hpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/main.cpp" target="_top">../src/examples/cpp11/http/server/main.cpp</a>
+            (<a href="../../examples/diffs/http/server/main.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/mime_types.cpp" target="_top">../src/examples/cpp11/http/server/mime_types.cpp</a>
+            (<a href="../../examples/diffs/http/server/mime_types.cpp.html" target="_top">diff to
+            C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/mime_types.hpp" target="_top">../src/examples/cpp11/http/server/mime_types.hpp</a>
+            (<a href="../../examples/diffs/http/server/mime_types.hpp.html" target="_top">diff to
+            C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/reply.cpp" target="_top">../src/examples/cpp11/http/server/reply.cpp</a>
+            (<a href="../../examples/diffs/http/server/reply.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/reply.hpp" target="_top">../src/examples/cpp11/http/server/reply.hpp</a>
+            (<a href="../../examples/diffs/http/server/reply.hpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/request.hpp" target="_top">../src/examples/cpp11/http/server/request.hpp</a>
+            (<a href="../../examples/diffs/http/server/request.hpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/request_handler.cpp" target="_top">../src/examples/cpp11/http/server/request_handler.cpp</a>
+            (<a href="../../examples/diffs/http/server/request_handler.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/request_handler.hpp" target="_top">../src/examples/cpp11/http/server/request_handler.hpp</a>
+            (<a href="../../examples/diffs/http/server/request_handler.hpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/request_parser.cpp" target="_top">../src/examples/cpp11/http/server/request_parser.cpp</a>
+            (<a href="../../examples/diffs/http/server/request_parser.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/request_parser.hpp" target="_top">../src/examples/cpp11/http/server/request_parser.hpp</a>
+            (<a href="../../examples/diffs/http/server/request_parser.hpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/server.cpp" target="_top">../src/examples/cpp11/http/server/server.cpp</a>
+            (<a href="../../examples/diffs/http/server/server.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/http/server/server.hpp" target="_top">../src/examples/cpp11/http/server/server.hpp</a>
+            (<a href="../../examples/diffs/http/server/server.hpp.html" target="_top">diff to C++03</a>)
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h9"></a>
+        <span><a name="asio.examples.cpp11_examples.multicast"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.multicast">Multicast</a>
+      </h5>
+<p>
+        An example showing the use of multicast to transmit packets to a group of
+        subscribers.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/multicast/receiver.cpp" target="_top">../src/examples/cpp11/multicast/receiver.cpp</a>
+            (<a href="../../examples/diffs/multicast/receiver.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/multicast/sender.cpp" target="_top">../src/examples/cpp11/multicast/sender.cpp</a>
+            (<a href="../../examples/diffs/multicast/sender.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h10"></a>
+        <span><a name="asio.examples.cpp11_examples.nonblocking"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.nonblocking">Nonblocking</a>
+      </h5>
+<p>
+        Example demonstrating reactor-style operations for integrating a third-party
+        library that wants to perform the I/O operations itself.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp11/nonblocking/third_party_lib.cpp" target="_top">../src/examples/cpp11/nonblocking/third_party_lib.cpp</a>
+            (<a href="../../examples/diffs/nonblocking/third_party_lib.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h11"></a>
+        <span><a name="asio.examples.cpp11_examples.operations"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.operations">Operations</a>
+      </h5>
+<p>
+        Examples showing how to implement composed asynchronous operations as reusable
+        library functions.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/operations/composed_1.cpp" target="_top">../src/examples/cpp11/operations/composed_1.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/operations/composed_2.cpp" target="_top">../src/examples/cpp11/operations/composed_2.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/operations/composed_3.cpp" target="_top">../src/examples/cpp11/operations/composed_3.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/operations/composed_4.cpp" target="_top">../src/examples/cpp11/operations/composed_4.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/operations/composed_5.cpp" target="_top">../src/examples/cpp11/operations/composed_5.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/operations/composed_6.cpp" target="_top">../src/examples/cpp11/operations/composed_6.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/operations/composed_7.cpp" target="_top">../src/examples/cpp11/operations/composed_7.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/operations/composed_8.cpp" target="_top">../src/examples/cpp11/operations/composed_8.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h12"></a>
+        <span><a name="asio.examples.cpp11_examples.parallel_groups"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.parallel_groups">Parallel
+        Groups</a>
+      </h5>
+<p>
+        Examples showing how to use the <a class="link" href="../reference/experimental__make_parallel_group.html" title="experimental::make_parallel_group"><code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">make_parallel_group</span></code></a> operation.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/parallel_group/wait_for_all.cpp" target="_top">../src/examples/cpp11/parallel_group/wait_for_all.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/parallel_group/wait_for_one.cpp" target="_top">../src/examples/cpp11/parallel_group/wait_for_one.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/parallel_group/wait_for_one_error.cpp" target="_top">../src/examples/cpp11/parallel_group/wait_for_one_error.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/parallel_group/wait_for_one_success.cpp" target="_top">../src/examples/cpp11/parallel_group/wait_for_one_success.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/parallel_group/ranged_wait_for_all.cpp" target="_top">../src/examples/cpp11/parallel_group/ranged_wait_for_all.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h13"></a>
+        <span><a name="asio.examples.cpp11_examples.socks_4"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.socks_4">SOCKS
+        4</a>
+      </h5>
+<p>
+        Example client program implementing the SOCKS 4 protocol for communication
+        via a proxy.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/socks4/sync_client.cpp" target="_top">../src/examples/cpp11/socks4/sync_client.cpp</a>
+            (<a href="../../examples/diffs/socks4/sync_client.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/socks4/socks4.hpp" target="_top">../src/examples/cpp11/socks4/socks4.hpp</a>
+            (<a href="../../examples/diffs/socks4/socks4.hpp.html" target="_top">diff to C++03</a>)
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h14"></a>
+        <span><a name="asio.examples.cpp11_examples.spawn"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.spawn">Spawn</a>
+      </h5>
+<p>
+        Example of using the asio::spawn() function, a wrapper around the <a href="http://www.boost.org/doc/libs/release/libs/coroutine/index.html" target="_top">Boost.Coroutine</a>
+        library, to implement a chain of asynchronous operations using stackful coroutines.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp11/spawn/echo_server.cpp" target="_top">../src/examples/cpp11/spawn/echo_server.cpp</a>
+            (<a href="../../examples/diffs/spawn/echo_server.cpp.html" target="_top">diff to C++03</a>)
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h15"></a>
+        <span><a name="asio.examples.cpp11_examples.ssl"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.ssl">SSL</a>
+      </h5>
+<p>
+        Example client and server programs showing the use of the <a class="link" href="../reference/ssl__stream.html" title="ssl::stream">ssl::stream&lt;&gt;</a>
+        template with asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/ssl/client.cpp" target="_top">../src/examples/cpp11/ssl/client.cpp</a>
+            (<a href="../../examples/diffs/ssl/client.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/ssl/server.cpp" target="_top">../src/examples/cpp11/ssl/server.cpp</a>
+            (<a href="../../examples/diffs/ssl/server.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h16"></a>
+        <span><a name="asio.examples.cpp11_examples.timeouts"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.timeouts">Timeouts</a>
+      </h5>
+<p>
+        A collection of examples showing how to cancel long running asynchronous
+        operations after a period of time.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/timeouts/async_tcp_client.cpp" target="_top">../src/examples/cpp11/timeouts/async_tcp_client.cpp</a>
+            (<a href="../../examples/diffs/timeouts/async_tcp_client.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/timeouts/blocking_tcp_client.cpp" target="_top">../src/examples/cpp11/timeouts/blocking_tcp_client.cpp</a>
+            (<a href="../../examples/diffs/timeouts/blocking_tcp_client.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/timeouts/blocking_token_tcp_client.cpp" target="_top">../src/examples/cpp11/timeouts/blocking_token_tcp_client.cpp</a>
+            (<a href="../../examples/diffs/timeouts/blocking_token_tcp_client.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/timeouts/blocking_udp_client.cpp" target="_top">../src/examples/cpp11/timeouts/blocking_udp_client.cpp</a>
+            (<a href="../../examples/diffs/timeouts/blocking_udp_client.cpp.html" target="_top">diff
+            to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/timeouts/server.cpp" target="_top">../src/examples/cpp11/timeouts/server.cpp</a>
+            (<a href="../../examples/diffs/timeouts/server.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h17"></a>
+        <span><a name="asio.examples.cpp11_examples.timers"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.timers">Timers</a>
+      </h5>
+<p>
+        Example showing how to customise basic_waitable_timer using a different clock
+        type.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp11/timers/time_t_timer.cpp" target="_top">../src/examples/cpp11/timers/time_t_timer.cpp</a>
+            (<a href="../../examples/diffs/timers/time_t_timer.cpp.html" target="_top">diff to C++03</a>)
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h18"></a>
+        <span><a name="asio.examples.cpp11_examples.type_erasure"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.type_erasure">Type
+        Erasure</a>
+      </h5>
+<p>
+        Example showing how to use <a class="link" href="../reference/any_completion_handler.html" title="any_completion_handler"><code class="computeroutput"><span class="identifier">any_completion_handler</span></code></a> to enable
+        separate compilation of asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/type_erasure/main.cpp" target="_top">../src/examples/cpp11/type_erasure/main.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/type_erasure/line_reader.hpp" target="_top">../src/examples/cpp11/type_erasure/line_reader.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/type_erasure/stdin_line_reader.hpp" target="_top">../src/examples/cpp11/type_erasure/stdin_line_reader.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/type_erasure/stdin_line_reader.cpp" target="_top">../src/examples/cpp11/type_erasure/stdin_line_reader.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/type_erasure/sleep.hpp" target="_top">../src/examples/cpp11/type_erasure/sleep.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/type_erasure/sleep.cpp" target="_top">../src/examples/cpp11/type_erasure/sleep.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp11_examples.h19"></a>
+        <span><a name="asio.examples.cpp11_examples.unix_domain_sockets"></a></span><a class="link" href="cpp11_examples.html#asio.examples.cpp11_examples.unix_domain_sockets">UNIX
+        Domain Sockets</a>
+      </h5>
+<p>
+        Examples showing how to use UNIX domain (local) sockets.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/local/connect_pair.cpp" target="_top">../src/examples/cpp11/local/connect_pair.cpp</a>
+            (<a href="../../examples/diffs/local/connect_pair.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/local/iostream_client.cpp" target="_top">../src/examples/cpp11/local/iostream_client.cpp</a>
+            (<a href="../../examples/diffs/local/iostream_client.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/local/stream_server.cpp" target="_top">../src/examples/cpp11/local/stream_server.cpp</a>
+            (<a href="../../examples/diffs/local/stream_server.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/local/stream_client.cpp" target="_top">../src/examples/cpp11/local/stream_client.cpp</a>
+            (<a href="../../examples/diffs/local/stream_client.cpp.html" target="_top">diff to C++03</a>)
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/local/fd_passing_stream_server.cpp" target="_top">../src/examples/cpp11/local/fd_passing_stream_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp11/local/fd_passing_stream_client.cpp" target="_top">../src/examples/cpp11/local/fd_passing_stream_client.cpp</a>
+          </li>
+</ul></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cpp03_examples.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../examples.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="cpp14_examples.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

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+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>C++14 Examples</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
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+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cpp11_examples.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../examples.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="cpp17_examples.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.examples.cpp14_examples"></a><a class="link" href="cpp14_examples.html" title="C++14 Examples">C++14 Examples</a>
+</h3></div></div></div>
+<h5>
+<a name="asio.examples.cpp14_examples.h0"></a>
+        <span><a name="asio.examples.cpp14_examples.deferred"></a></span><a class="link" href="cpp14_examples.html#asio.examples.cpp14_examples.deferred">Deferred</a>
+      </h5>
+<p>
+        Examples showing how to use the <a class="link" href="../reference/deferred.html" title="deferred"><code class="computeroutput"><span class="identifier">deferred</span></code></a> completion token.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/deferred/deferred_1.cpp" target="_top">../src/examples/cpp14/deferred/deferred_1.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/deferred/deferred_2.cpp" target="_top">../src/examples/cpp14/deferred/deferred_2.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/deferred/deferred_3.cpp" target="_top">../src/examples/cpp14/deferred/deferred_3.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/deferred/deferred_4.cpp" target="_top">../src/examples/cpp14/deferred/deferred_4.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/deferred/deferred_5.cpp" target="_top">../src/examples/cpp14/deferred/deferred_5.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/deferred/deferred_6.cpp" target="_top">../src/examples/cpp14/deferred/deferred_6.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/deferred/deferred_7.cpp" target="_top">../src/examples/cpp14/deferred/deferred_7.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp14_examples.h1"></a>
+        <span><a name="asio.examples.cpp14_examples.echo"></a></span><a class="link" href="cpp14_examples.html#asio.examples.cpp14_examples.echo">Echo</a>
+      </h5>
+<p>
+        A collection of simple clients and servers, showing the use of both synchronous
+        and asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/echo/async_tcp_echo_server.cpp" target="_top">../src/examples/cpp14/echo/async_tcp_echo_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/echo/async_udp_echo_server.cpp" target="_top">../src/examples/cpp14/echo/async_udp_echo_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/echo/blocking_tcp_echo_client.cpp" target="_top">../src/examples/cpp14/echo/blocking_tcp_echo_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/echo/blocking_tcp_echo_server.cpp" target="_top">../src/examples/cpp14/echo/blocking_tcp_echo_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/echo/blocking_udp_echo_client.cpp" target="_top">../src/examples/cpp14/echo/blocking_udp_echo_client.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/echo/blocking_udp_echo_server.cpp" target="_top">../src/examples/cpp14/echo/blocking_udp_echo_server.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp14_examples.h2"></a>
+        <span><a name="asio.examples.cpp14_examples.executors"></a></span><a class="link" href="cpp14_examples.html#asio.examples.cpp14_examples.executors">Executors</a>
+      </h5>
+<p>
+        Examples showing how to use the executor-related facilities.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/executors/actor.cpp" target="_top">../src/examples/cpp14/executors/actor.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/executors/async_1.cpp" target="_top">../src/examples/cpp14/executors/async_1.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/executors/async_2.cpp" target="_top">../src/examples/cpp14/executors/async_2.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/executors/bank_account_1.cpp" target="_top">../src/examples/cpp14/executors/bank_account_1.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/executors/bank_account_2.cpp" target="_top">../src/examples/cpp14/executors/bank_account_2.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/executors/fork_join.cpp" target="_top">../src/examples/cpp14/executors/fork_join.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/executors/pipeline.cpp" target="_top">../src/examples/cpp14/executors/pipeline.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/executors/priority_scheduler.cpp" target="_top">../src/examples/cpp14/executors/priority_scheduler.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp14_examples.h3"></a>
+        <span><a name="asio.examples.cpp14_examples.iostreams"></a></span><a class="link" href="cpp14_examples.html#asio.examples.cpp14_examples.iostreams">Iostreams</a>
+      </h5>
+<p>
+        Two examples showing how to use <a class="link" href="../reference/ip__tcp/iostream.html" title="ip::tcp::iostream">ip::tcp::iostream</a>.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp14/iostreams/http_client.cpp" target="_top">../src/examples/cpp14/iostreams/http_client.cpp</a>
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp14_examples.h4"></a>
+        <span><a name="asio.examples.cpp14_examples.operations"></a></span><a class="link" href="cpp14_examples.html#asio.examples.cpp14_examples.operations">Operations</a>
+      </h5>
+<p>
+        Examples showing how to implement composed asynchronous operations as reusable
+        library functions.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/operations/composed_1.cpp" target="_top">../src/examples/cpp14/operations/composed_1.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/operations/composed_2.cpp" target="_top">../src/examples/cpp14/operations/composed_2.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/operations/composed_3.cpp" target="_top">../src/examples/cpp14/operations/composed_3.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/operations/composed_4.cpp" target="_top">../src/examples/cpp14/operations/composed_4.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/operations/composed_5.cpp" target="_top">../src/examples/cpp14/operations/composed_5.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/operations/composed_6.cpp" target="_top">../src/examples/cpp14/operations/composed_6.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/operations/composed_7.cpp" target="_top">../src/examples/cpp14/operations/composed_7.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/operations/composed_8.cpp" target="_top">../src/examples/cpp14/operations/composed_8.cpp</a>
+          </li>
+</ul></div>
+<p>
+        Examples showing how to expose callback-based APIs as asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/operations/callback_wrapper.cpp" target="_top">../src/examples/cpp14/operations/callback_wrapper.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/operations/c_callback_wrapper.cpp" target="_top">../src/examples/cpp14/operations/c_callback_wrapper.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp14_examples.h5"></a>
+        <span><a name="asio.examples.cpp14_examples.parallel_groups"></a></span><a class="link" href="cpp14_examples.html#asio.examples.cpp14_examples.parallel_groups">Parallel
+        Groups</a>
+      </h5>
+<p>
+        Examples showing how to use the <a class="link" href="../reference/experimental__make_parallel_group.html" title="experimental::make_parallel_group"><code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">make_parallel_group</span></code></a> operation.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/parallel_group/parallel_sort.cpp" target="_top">../src/examples/cpp14/parallel_group/parallel_sort.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/parallel_group/wait_for_all.cpp" target="_top">../src/examples/cpp14/parallel_group/wait_for_all.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/parallel_group/wait_for_one.cpp" target="_top">../src/examples/cpp14/parallel_group/wait_for_one.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/parallel_group/wait_for_one_error.cpp" target="_top">../src/examples/cpp14/parallel_group/wait_for_one_error.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/parallel_group/wait_for_one_success.cpp" target="_top">../src/examples/cpp14/parallel_group/wait_for_one_success.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp14/parallel_group/ranged_wait_for_all.cpp" target="_top">../src/examples/cpp14/parallel_group/ranged_wait_for_all.cpp</a>
+          </li>
+</ul></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cpp11_examples.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../examples.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="cpp17_examples.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/examples/cpp17_examples.html

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+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>C++17 Examples</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cpp14_examples.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../examples.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="cpp20_examples.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.examples.cpp17_examples"></a><a class="link" href="cpp17_examples.html" title="C++17 Examples">C++17 Examples</a>
+</h3></div></div></div>
+<h5>
+<a name="asio.examples.cpp17_examples.h0"></a>
+        <span><a name="asio.examples.cpp17_examples.coroutines_ts_support"></a></span><a class="link" href="cpp17_examples.html#asio.examples.cpp17_examples.coroutines_ts_support">Coroutines
+        TS Support</a>
+      </h5>
+<p>
+        Examples showing how to implement a chain of asynchronous operations using
+        the Coroutines TS.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp17/coroutines_ts/echo_server.cpp" target="_top">../src/examples/cpp17/coroutines_ts/echo_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp17/coroutines_ts/refactored_echo_server.cpp" target="_top">../src/examples/cpp17/coroutines_ts/refactored_echo_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp17/coroutines_ts/chat_server.cpp" target="_top">../src/examples/cpp17/coroutines_ts/chat_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp17/coroutines_ts/range_based_for.cpp" target="_top">../src/examples/cpp17/coroutines_ts/range_based_for.cpp</a>
+          </li>
+</ul></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cpp14_examples.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../examples.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="cpp20_examples.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/examples/cpp20_examples.html

@@ -0,0 +1,155 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>C++20 Examples</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../examples.html" title="Examples">
+<link rel="prev" href="cpp17_examples.html" title="C++17 Examples">
+<link rel="next" href="../reference.html" title="Reference">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cpp17_examples.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../examples.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="../reference.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.examples.cpp20_examples"></a><a class="link" href="cpp20_examples.html" title="C++20 Examples">C++20 Examples</a>
+</h3></div></div></div>
+<h5>
+<a name="asio.examples.cpp20_examples.h0"></a>
+        <span><a name="asio.examples.cpp20_examples.channels"></a></span><a class="link" href="cpp20_examples.html#asio.examples.cpp20_examples.channels">Channels</a>
+      </h5>
+<p>
+        Example showing how to use a channel in conjunction with C++20 coroutines.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a href="../../../src/examples/cpp20/channels/throttling_proxy.cpp" target="_top">../src/examples/cpp20/channels/throttling_proxy.cpp</a>
+          </li></ul></div>
+<h5>
+<a name="asio.examples.cpp20_examples.h1"></a>
+        <span><a name="asio.examples.cpp20_examples.coroutines"></a></span><a class="link" href="cpp20_examples.html#asio.examples.cpp20_examples.coroutines">Coroutines</a>
+      </h5>
+<p>
+        Examples showing how to implement a chain of asynchronous operations using
+        C++20 Coroutines.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/coroutines/echo_server.cpp" target="_top">../src/examples/cpp20/coroutines/echo_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/coroutines/echo_server_with_default.cpp" target="_top">../src/examples/cpp20/coroutines/echo_server_with_default.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/coroutines/echo_server_with_as_tuple_default.cpp" target="_top">../src/examples/cpp20/coroutines/echo_server_with_as_tuple_default.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/coroutines/echo_server_with_as_single_default.cpp" target="_top">../src/examples/cpp20/coroutines/echo_server_with_as_single_default.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/coroutines/echo_server_with_deferred.cpp" target="_top">../src/examples/cpp20/coroutines/echo_server_with_deferred.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/coroutines/echo_server_with_deferred_default.cpp" target="_top">../src/examples/cpp20/coroutines/echo_server_with_deferred_default.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/coroutines/refactored_echo_server.cpp" target="_top">../src/examples/cpp20/coroutines/refactored_echo_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/coroutines/chat_server.cpp" target="_top">../src/examples/cpp20/coroutines/chat_server.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/coroutines/timeout.cpp" target="_top">../src/examples/cpp20/coroutines/timeout.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp20_examples.h2"></a>
+        <span><a name="asio.examples.cpp20_examples.operations"></a></span><a class="link" href="cpp20_examples.html#asio.examples.cpp20_examples.operations">Operations</a>
+      </h5>
+<p>
+        Examples showing how to implement composed asynchronous operations as reusable
+        library functions.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/operations/composed_1.cpp" target="_top">../src/examples/cpp20/operations/composed_1.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/operations/composed_2.cpp" target="_top">../src/examples/cpp20/operations/composed_2.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/operations/composed_3.cpp" target="_top">../src/examples/cpp20/operations/composed_3.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/operations/composed_4.cpp" target="_top">../src/examples/cpp20/operations/composed_4.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/operations/composed_5.cpp" target="_top">../src/examples/cpp20/operations/composed_5.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/operations/composed_6.cpp" target="_top">../src/examples/cpp20/operations/composed_6.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/operations/composed_7.cpp" target="_top">../src/examples/cpp20/operations/composed_7.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/operations/composed_8.cpp" target="_top">../src/examples/cpp20/operations/composed_8.cpp</a>
+          </li>
+</ul></div>
+<p>
+        Examples showing how to expose callback-based APIs as asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/operations/callback_wrapper.cpp" target="_top">../src/examples/cpp20/operations/callback_wrapper.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/operations/c_callback_wrapper.cpp" target="_top">../src/examples/cpp20/operations/c_callback_wrapper.cpp</a>
+          </li>
+</ul></div>
+<h5>
+<a name="asio.examples.cpp20_examples.h3"></a>
+        <span><a name="asio.examples.cpp20_examples.type_erasure"></a></span><a class="link" href="cpp20_examples.html#asio.examples.cpp20_examples.type_erasure">Type
+        Erasure</a>
+      </h5>
+<p>
+        Example showing how to use <a class="link" href="../reference/any_completion_handler.html" title="any_completion_handler"><code class="computeroutput"><span class="identifier">any_completion_handler</span></code></a> to enable
+        separate compilation of asynchronous operations.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/type_erasure/main.cpp" target="_top">../src/examples/cpp20/type_erasure/main.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/type_erasure/line_reader.hpp" target="_top">../src/examples/cpp20/type_erasure/line_reader.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/type_erasure/stdin_line_reader.hpp" target="_top">../src/examples/cpp20/type_erasure/stdin_line_reader.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/type_erasure/stdin_line_reader.cpp" target="_top">../src/examples/cpp20/type_erasure/stdin_line_reader.cpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/type_erasure/sleep.hpp" target="_top">../src/examples/cpp20/type_erasure/sleep.hpp</a>
+          </li>
+<li class="listitem">
+            <a href="../../../src/examples/cpp20/type_erasure/sleep.cpp" target="_top">../src/examples/cpp20/type_erasure/sleep.cpp</a>
+          </li>
+</ul></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cpp17_examples.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../examples.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="../reference.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview.html

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+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Overview</title>
+<link rel="stylesheet" href="../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../index.html" title="Asio">
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+<link rel="next" href="overview/rationale.html" title="Rationale">
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+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../asio.png"></td></tr></table>
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+<a name="asio.overview"></a><a class="link" href="overview.html" title="Overview">Overview</a>
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+          <a class="link" href="overview/model.html" title="Asynchronous Model">Asynchronous Model</a>
+          <div class="itemizedlist"><ul class="itemizedlist" type="circle">
+<li class="listitem">
+                <a class="link" href="overview/model/async_ops.html" title="Asynchronous Operations">Asynchronous Operations</a>
+              </li>
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+                <a class="link" href="overview/model/async_agents.html" title="Asynchronous Agents">Asynchronous Agents</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/model/associators.html" title="Associated Characteristics and Associators">Associated Characteristics
+                and Associators</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/model/child_agents.html" title="Child Agents">Child Agents</a>
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+                <a class="link" href="overview/model/executors.html" title="Executors">Executors</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/model/allocators.html" title="Allocators">Allocators</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/model/cancellation.html" title="Cancellation">Cancellation</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/model/completion_tokens.html" title="Completion Tokens">Completion
+                Tokens</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/model/library_elements.html" title="Supporting Library Elements">Supporting Library
+                Elements</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/model/higher_levels.html" title="Higher Level Abstractions">Higher Level Abstractions</a>
+              </li>
+</ul></div>
+        </li>
+<li class="listitem">
+          <a class="link" href="overview/core.html" title="Core Concepts and Functionality">Core Concepts and Functionality</a>
+          <div class="itemizedlist"><ul class="itemizedlist" type="circle">
+<li class="listitem">
+                <a class="link" href="overview/core/async.html" title="The Proactor Design Pattern: Concurrency Without Threads">The Proactor Design Pattern:
+                Concurrency Without Threads</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/core/threads.html" title="Threads and Asio">Threads and Asio</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/core/strands.html" title="Strands: Use Threads Without Explicit Locking">Strands: Use Threads Without
+                Explicit Locking</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/core/buffers.html" title="Buffers">Buffers</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/core/streams.html" title="Streams, Short Reads and Short Writes">Streams, Short Reads and
+                Short Writes</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/core/reactor.html" title="Reactor-Style Operations">Reactor-Style Operations</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/core/line_based.html" title="Line-Based Operations">Line-Based Operations</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/core/allocation.html" title="Custom Memory Allocation">Custom Memory Allocation</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/core/cancellation.html" title="Per-Operation Cancellation">Per-Operation Cancellation</a>
+              </li>
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+              </li>
+<li class="listitem">
+                <a class="link" href="overview/core/concurrency_hint.html" title="Concurrency Hints">Concurrency Hints</a>
+              </li>
+</ul></div>
+        </li>
+<li class="listitem">
+          <a class="link" href="overview/composition.html" title="Composition and Completion Tokens">Composition and Completion Tokens</a>
+          <div class="itemizedlist"><ul class="itemizedlist" type="circle">
+<li class="listitem">
+                <a class="link" href="overview/composition/coroutine.html" title="Stackless Coroutines">Stackless Coroutines</a>
+              </li>
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+                <a class="link" href="overview/composition/spawn.html" title="Stackful Coroutines">Stackful Coroutines</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/composition/futures.html" title="Futures">Futures</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/composition/cpp20_coroutines.html" title="C++20 Coroutines Support">C++20
+                Coroutines Support</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/composition/coro.html" title="Resumable C++ 20 Coroutines">Resumable C++20 Coroutines
+                (experimental)</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/composition/deferred.html" title="Deferred Operations">Deferred Operations
+                (experimental)</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/composition/promises.html" title="Promises">Promises (experimental)</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/composition/parallel_group.html" title="Co-ordinating Parallel Operations">Co-ordinating
+                Parallel Operations (experimental)</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/composition/compose.html" title="Compositions as Asynchronous Operations">Compositions as
+                Asynchronous Operations</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/composition/token_adapters.html" title="Completion Token Adapters">Completion
+                Token Adapters</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/composition/type_erasure.html" title="Type Erasure, Separate Compilation and Virtual Functions">Type Erasure,
+                Separate Compilation and Virtual Functions</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/composition/immediate_completion.html" title="Customising Immediate Completion">Customising
+                Immediate Completion</a>
+              </li>
+</ul></div>
+        </li>
+<li class="listitem">
+          <a class="link" href="overview/networking.html" title="Networking">Networking</a>
+          <div class="itemizedlist"><ul class="itemizedlist" type="circle">
+<li class="listitem">
+                <a class="link" href="overview/networking/protocols.html" title="TCP, UDP and ICMP">TCP, UDP and ICMP</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/networking/other_protocols.html" title="Support for Other Protocols">Support
+                for Other Protocols</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/networking/iostreams.html" title="Socket Iostreams">Socket Iostreams</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/networking/bsd_sockets.html" title="The BSD Socket API and Asio">The BSD Socket
+                API and Asio</a>
+              </li>
+</ul></div>
+        </li>
+<li class="listitem">
+          <a class="link" href="overview/timers.html" title="Timers">Timers</a>
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+          <a class="link" href="overview/files.html" title="Files">Files</a>
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+          <a class="link" href="overview/serial_ports.html" title="Serial Ports">Serial Ports</a>
+        </li>
+<li class="listitem">
+          <a class="link" href="overview/signals.html" title="Signal Handling">Signal Handling</a>
+        </li>
+<li class="listitem">
+          <a class="link" href="overview/channels.html" title="Channels">Channels (experimental)</a>
+        </li>
+<li class="listitem">
+          <a class="link" href="overview/posix.html" title="POSIX-Specific Functionality">POSIX-Specific Functionality</a>
+          <div class="itemizedlist"><ul class="itemizedlist" type="circle">
+<li class="listitem">
+                <a class="link" href="overview/posix/local.html" title="UNIX Domain Sockets">UNIX Domain Sockets</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/posix/stream_descriptor.html" title="Stream-Oriented File Descriptors">Stream-Oriented
+                File Descriptors</a>
+              </li>
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+                <a class="link" href="overview/posix/fork.html" title="Fork">Fork</a>
+              </li>
+</ul></div>
+        </li>
+<li class="listitem">
+          <a class="link" href="overview/windows.html" title="Windows-Specific Functionality">Windows-Specific Functionality</a>
+          <div class="itemizedlist"><ul class="itemizedlist" type="circle">
+<li class="listitem">
+                <a class="link" href="overview/windows/stream_handle.html" title="Stream-Oriented HANDLEs">Stream-Oriented
+                HANDLEs</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/windows/random_access_handle.html" title="Random-Access HANDLEs">Random-Access
+                HANDLEs</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/windows/object_handle.html" title="Object HANDLEs">Object HANDLEs</a>
+              </li>
+</ul></div>
+        </li>
+<li class="listitem">
+          <a class="link" href="overview/ssl.html" title="SSL">SSL</a>
+        </li>
+<li class="listitem">
+          <a class="link" href="overview/cpp2011.html" title="C++ 2011 Support">C++ 2011 Support</a>
+          <div class="itemizedlist"><ul class="itemizedlist" type="circle">
+<li class="listitem">
+                <a class="link" href="overview/cpp2011/move_objects.html" title="Movable I/O Objects">Movable I/O Objects</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/cpp2011/move_handlers.html" title="Movable Handlers">Movable Handlers</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/cpp2011/variadic.html" title="Variadic Templates">Variadic Templates</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/cpp2011/array.html" title="Array Container">Array Container</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/cpp2011/atomic.html" title="Atomics">Atomics</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/cpp2011/shared_ptr.html" title="Shared Pointers">Shared Pointers</a>
+              </li>
+<li class="listitem">
+                <a class="link" href="overview/cpp2011/chrono.html" title="Chrono">Chrono</a>
+              </li>
+</ul></div>
+        </li>
+<li class="listitem">
+          <a class="link" href="overview/implementation.html" title="Platform-Specific Implementation Notes">Platform-Specific Implementation
+          Notes</a>
+        </li>
+</ul></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
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+</html>

3party/asio/doc/asio/overview/basics.html

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+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Basic Asio Anatomy</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
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+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="rationale.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="model.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.basics"></a><a class="link" href="basics.html" title="Basic Asio Anatomy">Basic Asio Anatomy</a>
+</h3></div></div></div>
+<p>
+        Asio may be used to perform both synchronous and asynchronous operations
+        on I/O objects such as sockets. Before using Asio it may be useful to get
+        a conceptual picture of the various parts of Asio, your program, and how
+        they work together.
+      </p>
+<p>
+        As an introductory example, let's consider what happens when you perform
+        a connect operation on a socket. We shall start by examining synchronous
+        operations.
+      </p>
+<p>
+        <span class="inlinemediaobject"><img src="../../sync_op.png"></span>
+      </p>
+<p>
+        <span class="bold"><strong>Your program</strong></span> will have at least one <span class="bold"><strong>I/O execution context</strong></span>, such as an <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span></code>
+        object, <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">thread_pool</span></code> object, or <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">system_context</span></code>.
+        This <span class="bold"><strong>I/O execution context</strong></span> represents <span class="bold"><strong>your program</strong></span>'s link to the <span class="bold"><strong>operating
+        system</strong></span>'s I/O services.
+      </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span> <span class="identifier">io_context</span><span class="special">;</span>
+</pre>
+<p>
+        To perform I/O operations <span class="bold"><strong>your program</strong></span> will
+        need an <span class="bold"><strong>I/O object</strong></span> such as a TCP socket:
+      </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">io_context</span><span class="special">);</span>
+</pre>
+<p>
+        When a synchronous connect operation is performed, the following sequence
+        of events occurs:
+      </p>
+<p>
+        1. <span class="bold"><strong>Your program</strong></span> initiates the connect operation
+        by calling the <span class="bold"><strong>I/O object</strong></span>:
+      </p>
+<pre class="programlisting"><span class="identifier">socket</span><span class="special">.</span><span class="identifier">connect</span><span class="special">(</span><span class="identifier">server_endpoint</span><span class="special">);</span>
+</pre>
+<p>
+        2. The <span class="bold"><strong>I/O object</strong></span> forwards the request to
+        the <span class="bold"><strong>I/O execution context</strong></span>.
+      </p>
+<p>
+        3. The <span class="bold"><strong>I/O execution context</strong></span> calls on the
+        <span class="bold"><strong>operating system</strong></span> to perform the connect
+        operation.
+      </p>
+<p>
+        4. The <span class="bold"><strong>operating system</strong></span> returns the result
+        of the operation to the <span class="bold"><strong>I/O execution context</strong></span>.
+      </p>
+<p>
+        5. The <span class="bold"><strong>I/O execution context</strong></span> translates
+        any error resulting from the operation into an object of type <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span></code>. An <code class="computeroutput"><span class="identifier">error_code</span></code>
+        may be compared with specific values, or tested as a boolean (where a <code class="computeroutput"><span class="keyword">false</span></code> result means that no error occurred).
+        The result is then forwarded back up to the <span class="bold"><strong>I/O object</strong></span>.
+      </p>
+<p>
+        6. The <span class="bold"><strong>I/O object</strong></span> throws an exception of
+        type <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">system_error</span></code> if the operation failed. If
+        the code to initiate the operation had instead been written as:
+      </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">;</span>
+<span class="identifier">socket</span><span class="special">.</span><span class="identifier">connect</span><span class="special">(</span><span class="identifier">server_endpoint</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span>
+</pre>
+<p>
+        then the <code class="computeroutput"><span class="identifier">error_code</span></code> variable
+        <code class="computeroutput"><span class="identifier">ec</span></code> would be set to the result
+        of the operation, and no exception would be thrown.
+      </p>
+<p>
+        When an asynchronous operation is used, a different sequence of events occurs.
+      </p>
+<p>
+        <span class="inlinemediaobject"><img src="../../async_op1.png"></span>
+      </p>
+<p>
+        1. <span class="bold"><strong>Your program</strong></span> initiates the connect operation
+        by calling the <span class="bold"><strong>I/O object</strong></span>:
+      </p>
+<pre class="programlisting"><span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_connect</span><span class="special">(</span><span class="identifier">server_endpoint</span><span class="special">,</span> <span class="identifier">your_completion_handler</span><span class="special">);</span>
+</pre>
+<p>
+        where <code class="computeroutput"><span class="identifier">your_completion_handler</span></code>
+        is a function or function object with the signature:
+      </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">your_completion_handler</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">);</span>
+</pre>
+<p>
+        The exact signature required depends on the asynchronous operation being
+        performed. The reference documentation indicates the appropriate form for
+        each operation.
+      </p>
+<p>
+        2. The <span class="bold"><strong>I/O object</strong></span> forwards the request to
+        the <span class="bold"><strong>I/O execution context</strong></span>.
+      </p>
+<p>
+        3. The <span class="bold"><strong>I/O execution context</strong></span> signals to
+        the <span class="bold"><strong>operating system</strong></span> that it should start
+        an asynchronous connect.
+      </p>
+<p>
+        Time passes. (In the synchronous case this wait would have been contained
+        entirely within the duration of the connect operation.)
+      </p>
+<p>
+        <span class="inlinemediaobject"><img src="../../async_op2.png"></span>
+      </p>
+<p>
+        4. The <span class="bold"><strong>operating system</strong></span> indicates that the
+        connect operation has completed by placing the result on a queue, ready to
+        be picked up by the <span class="bold"><strong>I/O execution context</strong></span>.
+      </p>
+<p>
+        5. When using an <code class="computeroutput"><span class="identifier">io_context</span></code>
+        as the <span class="bold"><strong>I/O execution context</strong></span>, <span class="bold"><strong>your program</strong></span> must make a call to <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>
+        (or to one of the similar <code class="computeroutput"><span class="identifier">io_context</span></code>
+        member functions) in order for the result to be retrieved. A call to <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code> blocks
+        while there are unfinished asynchronous operations, so you would typically
+        call it as soon as you have started your first asynchronous operation.
+      </p>
+<p>
+        6. While inside the call to <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>,
+        the <span class="bold"><strong>I/O execution context</strong></span> dequeues the result
+        of the operation, translates it into an <code class="computeroutput"><span class="identifier">error_code</span></code>,
+        and then passes it to <span class="bold"><strong>your completion handler</strong></span>.
+      </p>
+<p>
+        This is a simplified picture of how Asio operates. You will want to delve
+        further into the documentation if your needs are more advanced, such as extending
+        Asio to perform other types of asynchronous operations.
+      </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="rationale.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="model.html"><img src="../../next.png" alt="Next"></a>
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+</body>
+</html>

3party/asio/doc/asio/overview/channels.html

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+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Channels</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="signals.html" title="Signal Handling">
+<link rel="next" href="posix.html" title="POSIX-Specific Functionality">
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+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="signals.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="posix.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.channels"></a><a class="link" href="channels.html" title="Channels">Channels</a>
+</h3></div></div></div>
+<div class="note"><table border="0" summary="Note">
+<tr>
+<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../note.png"></td>
+<th align="left">Note</th>
+</tr>
+<tr><td align="left" valign="top"><p>
+          This is an experimental feature.
+        </p></td></tr>
+</table></div>
+<p>
+        The templates <a class="link" href="../reference/experimental__basic_channel.html" title="experimental::basic_channel">experimental::basic_channel</a>
+        and <a class="link" href="../reference/experimental__basic_concurrent_channel.html" title="experimental::basic_concurrent_channel">experimental::basic_concurrent_channel</a>,
+        with aliases <code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">channel</span></code>
+        and <code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">concurrent_channel</span></code>, may be used to send
+        messages between different parts of the same application. A <span class="emphasis"><em>message</em></span>
+        is defined as a collection of arguments to be passed to a completion handler,
+        and the set of messages supported by a channel is specified by its template
+        parameters. Messages may be sent and received using asynchronous or non-blocking
+        synchronous operations.
+      </p>
+<p>
+        For example:
+      </p>
+<pre class="programlisting"><span class="comment">// Create a channel with no buffer space.</span>
+<span class="identifier">channel</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">(</span><span class="identifier">error_code</span><span class="special">,</span> <span class="identifier">size_t</span><span class="special">)&gt;</span> <span class="identifier">ch</span><span class="special">(</span><span class="identifier">ctx</span><span class="special">);</span>
+
+<span class="comment">// The call to try_send fails as there is no buffer</span>
+<span class="comment">// space and no waiting receive operations.</span>
+<span class="keyword">bool</span> <span class="identifier">ok</span> <span class="special">=</span> <span class="identifier">ch</span><span class="special">.</span><span class="identifier">try_send</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error</span><span class="special">::</span><span class="identifier">eof</span><span class="special">,</span> <span class="number">123</span><span class="special">);</span>
+<span class="identifier">assert</span><span class="special">(!</span><span class="identifier">ok</span><span class="special">);</span>
+
+<span class="comment">// The async_send operation is outstanding until</span>
+<span class="comment">// a receive operation consumes the message.</span>
+<span class="identifier">ch</span><span class="special">.</span><span class="identifier">async_send</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error</span><span class="special">::</span><span class="identifier">eof</span><span class="special">,</span> <span class="number">123</span><span class="special">,</span>
+    <span class="special">[](</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="comment">// ...</span>
+    <span class="special">});</span>
+
+<span class="comment">// The async_receive consumes the message. Both the</span>
+<span class="comment">// async_send and async_receive operations complete</span>
+<span class="comment">// immediately.</span>
+<span class="identifier">ch</span><span class="special">.</span><span class="identifier">async_receive</span><span class="special">(</span>
+    <span class="special">[](</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="comment">// ...</span>
+    <span class="special">});</span>
+</pre>
+<h5>
+<a name="asio.overview.channels.h0"></a>
+        <span><a name="asio.overview.channels.see_also"></a></span><a class="link" href="channels.html#asio.overview.channels.see_also">See
+        Also</a>
+      </h5>
+<p>
+        <a class="link" href="../reference/experimental__basic_channel.html" title="experimental::basic_channel">experimental::basic_channel</a>,
+        <a class="link" href="../reference/experimental__basic_concurrent_channel.html" title="experimental::basic_concurrent_channel">experimental::basic_concurrent_channel</a>,
+        <a class="link" href="../examples/cpp20_examples.html#asio.examples.cpp20_examples.channels">Channels examples (C++20)</a>.
+      </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="signals.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="posix.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/composition.html

@@ -0,0 +1,81 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Composition and Completion Tokens</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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+<link rel="next" href="composition/coroutine.html" title="Stackless Coroutines">
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+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.composition"></a><a class="link" href="composition.html" title="Composition and Completion Tokens">Composition and Completion
+      Tokens</a>
+</h3></div></div></div>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a class="link" href="composition/coroutine.html" title="Stackless Coroutines">Stackless Coroutines</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="composition/spawn.html" title="Stackful Coroutines">Stackful Coroutines</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="composition/futures.html" title="Futures">Futures</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="composition/cpp20_coroutines.html" title="C++20 Coroutines Support">C++20 Coroutines
+            Support</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="composition/coro.html" title="Resumable C++ 20 Coroutines">Resumable C++20 Coroutines
+            (experimental)</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="composition/deferred.html" title="Deferred Operations">Deferred Operations
+            (experimental)</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="composition/promises.html" title="Promises">Promises (experimental)</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="composition/parallel_group.html" title="Co-ordinating Parallel Operations">Co-ordinating
+            Parallel Operations (experimental)</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="composition/compose.html" title="Compositions as Asynchronous Operations">Compositions as Asynchronous
+            Operations</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="composition/token_adapters.html" title="Completion Token Adapters">Completion Token
+            Adapters</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="composition/type_erasure.html" title="Type Erasure, Separate Compilation and Virtual Functions">Type Erasure,
+            Separate Compilation and Virtual Functions</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="composition/immediate_completion.html" title="Customising Immediate Completion">Customising
+            Immediate Completion</a>
+          </li>
+</ul></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="core/concurrency_hint.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="composition/coroutine.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/composition/compose.html

@@ -0,0 +1,136 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Compositions as Asynchronous Operations</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../composition.html" title="Composition and Completion Tokens">
+<link rel="prev" href="parallel_group.html" title="Co-ordinating Parallel Operations">
+<link rel="next" href="token_adapters.html" title="Completion Token Adapters">
+<meta name="viewport" content="width=device-width, initial-scale=1">
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+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="parallel_group.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="token_adapters.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.composition.compose"></a><a class="link" href="compose.html" title="Compositions as Asynchronous Operations">Compositions as
+        Asynchronous Operations</a>
+</h4></div></div></div>
+<p>
+          Application developers may wish to package their own compositions as conforming
+          <a class="link" href="../model/async_ops.html" title="Asynchronous Operations">asynchronous operations</a>
+          within the <a class="link" href="../model.html" title="Asynchronous Model">asynchronous model</a>.
+          Doing so facilitates seamless composition of these operations together
+          with the operations already provided by Asio.
+        </p>
+<p>
+          While these operations may be written from scratch to conform with the
+          <a class="link" href="../../reference/asynchronous_operations.html" title="Requirements on asynchronous operations">requirements on
+          asynchronous operations</a>, Asio includes the <a class="link" href="../../reference/async_compose.html" title="async_compose"><code class="computeroutput"><span class="identifier">async_compose</span></code></a> function to simplify
+          this process. The <code class="computeroutput"><span class="identifier">async_compose</span></code>
+          implementation automatically provides an intermediate completion handler
+          that correctly propagates the <a class="link" href="../model/associators.html" title="Associated Characteristics and Associators">associated
+          characteristics</a> and tracks outstanding work against the I/O executor
+          and completion executor.
+        </p>
+<p>
+          The following example illustrates an asynchronous echo loop (i.e. read,
+          followed by write, and so on), expressed as a simple state machine.
+        </p>
+<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">async_echo_implementation</span>
+<span class="special">{</span>
+  <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&amp;</span> <span class="identifier">socket_</span><span class="special">;</span>
+  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">mutable_buffer</span> <span class="identifier">buffer_</span><span class="special">;</span>
+  <span class="keyword">enum</span> <span class="special">{</span> <span class="identifier">starting</span><span class="special">,</span> <span class="identifier">reading</span><span class="special">,</span> <span class="identifier">writing</span> <span class="special">}</span> <span class="identifier">state_</span><span class="special">;</span>
+
+  <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Self</span><span class="special">&gt;</span>
+  <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">Self</span><span class="special">&amp;</span> <span class="identifier">self</span><span class="special">,</span>
+      <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">error</span> <span class="special">=</span> <span class="special">{},</span>
+      <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="keyword">switch</span> <span class="special">(</span><span class="identifier">state_</span><span class="special">)</span>
+    <span class="special">{</span>
+    <span class="keyword">case</span> <span class="identifier">starting</span><span class="special">:</span>
+      <span class="identifier">state_</span> <span class="special">=</span> <span class="identifier">reading</span><span class="special">;</span>
+      <span class="identifier">socket_</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span>
+          <span class="identifier">buffer_</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">self</span><span class="special">));</span>
+      <span class="keyword">break</span><span class="special">;</span>
+    <span class="keyword">case</span> <span class="identifier">reading</span><span class="special">:</span>
+      <span class="keyword">if</span> <span class="special">(</span><span class="identifier">error</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="identifier">self</span><span class="special">.</span><span class="identifier">complete</span><span class="special">(</span><span class="identifier">error</span><span class="special">,</span> <span class="number">0</span><span class="special">);</span>
+      <span class="special">}</span>
+      <span class="keyword">else</span>
+      <span class="special">{</span>
+        <span class="identifier">state_</span> <span class="special">=</span> <span class="identifier">writing</span><span class="special">;</span>
+        <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_write</span><span class="special">(</span><span class="identifier">socket_</span><span class="special">,</span> <span class="identifier">buffer_</span><span class="special">,</span>
+            <span class="identifier">asio</span><span class="special">::</span><span class="identifier">transfer_exactly</span><span class="special">(</span><span class="identifier">n</span><span class="special">),</span>
+            <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">self</span><span class="special">));</span>
+      <span class="special">}</span>
+      <span class="keyword">break</span><span class="special">;</span>
+    <span class="keyword">case</span> <span class="identifier">writing</span><span class="special">:</span>
+      <span class="identifier">self</span><span class="special">.</span><span class="identifier">complete</span><span class="special">(</span><span class="identifier">error</span><span class="special">,</span> <span class="identifier">n</span><span class="special">);</span>
+      <span class="keyword">break</span><span class="special">;</span>
+    <span class="special">}</span>
+  <span class="special">}</span>
+<span class="special">};</span>
+</pre>
+<p>
+          This implementation is then used in an initiating function, which trivially
+          wraps <code class="computeroutput"><span class="identifier">async_compose</span></code>:
+        </p>
+<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CompletionToken</span><span class="special">&gt;</span>
+<span class="keyword">auto</span> <span class="identifier">async_echo</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&amp;</span> <span class="identifier">socket</span><span class="special">,</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">mutable_buffer</span> <span class="identifier">buffer</span><span class="special">,</span>
+    <span class="identifier">CompletionToken</span><span class="special">&amp;&amp;</span> <span class="identifier">token</span><span class="special">)</span> <span class="special">-&gt;</span>
+  <span class="keyword">typename</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_result</span><span class="special">&lt;</span>
+    <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">decay</span><span class="special">&lt;</span><span class="identifier">CompletionToken</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span>
+      <span class="keyword">void</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">)&gt;::</span><span class="identifier">return_type</span>
+<span class="special">{</span>
+  <span class="keyword">return</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_compose</span><span class="special">&lt;</span><span class="identifier">CompletionToken</span><span class="special">,</span>
+    <span class="keyword">void</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">)&gt;(</span>
+      <span class="identifier">async_echo_implementation</span><span class="special">{</span><span class="identifier">socket</span><span class="special">,</span> <span class="identifier">buffer</span><span class="special">,</span>
+        <span class="identifier">async_echo_implementation</span><span class="special">::</span><span class="identifier">starting</span><span class="special">},</span>
+      <span class="identifier">token</span><span class="special">,</span> <span class="identifier">socket</span><span class="special">);</span>
+<span class="special">}</span>
+</pre>
+<p>
+          Here, <code class="computeroutput"><span class="identifier">async_compose</span></code> is
+          first passed the function object that contains the implementation of the
+          composed asynchronous operation. The first argument to the function object
+          is a non-const reference to the enclosing intermediate completion handler.
+          The remaining arguments are any arguments that originate from the completion
+          handlers of any asynchronous operations performed by the implementation.
+        </p>
+<p>
+          The <code class="computeroutput"><span class="identifier">async_compose</span></code> function
+          is also passed the completion token, and zero or more I/O objects or I/O
+          executors for which outstanding work must be maintained.
+        </p>
+<h6>
+<a name="asio.overview.composition.compose.h0"></a>
+          <span><a name="asio.overview.composition.compose.see_also"></a></span><a class="link" href="compose.html#asio.overview.composition.compose.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/async_compose.html" title="async_compose">async_compose</a>, <a class="link" href="../../examples/cpp11_examples.html#asio.examples.cpp11_examples.operations">Operations examples (C++11)</a>,
+          <a class="link" href="../../examples/cpp14_examples.html#asio.examples.cpp14_examples.operations">Operations examples
+          (C++14)</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="parallel_group.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="token_adapters.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/composition/coro.html

@@ -0,0 +1,587 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Resumable C++ 20 Coroutines</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../composition.html" title="Composition and Completion Tokens">
+<link rel="prev" href="cpp20_coroutines.html" title="C++20 Coroutines Support">
+<link rel="next" href="deferred.html" title="Deferred Operations">
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+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cpp20_coroutines.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="deferred.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.composition.coro"></a><a class="link" href="coro.html" title="Resumable C++ 20 Coroutines">Resumable C++ 20 Coroutines</a>
+</h4></div></div></div>
+<div class="note"><table border="0" summary="Note">
+<tr>
+<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../note.png"></td>
+<th align="left">Note</th>
+</tr>
+<tr><td align="left" valign="top"><p>
+            This is an experimental feature.
+          </p></td></tr>
+</table></div>
+<p>
+          The <a class="link" href="../../reference/experimental__coro.html" title="experimental::coro"><code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">coro</span></code></a>
+          class provides support for a universal C++20 coroutine. These coroutines
+          can be used as tasks, generators and transfomers, depending on their signature.
+        </p>
+<pre class="programlisting"><span class="identifier">coro</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string_view</span><span class="special">&gt;</span> <span class="identifier">line_reader</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">stream</span><span class="special">)</span>
+<span class="special">{</span>
+   <span class="keyword">while</span> <span class="special">(</span><span class="identifier">stream</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">())</span>
+   <span class="special">{</span>
+     <span class="identifier">std</span><span class="special">::</span><span class="identifier">array</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="number">4096</span><span class="special">&gt;</span> <span class="identifier">buf</span><span class="special">;</span>
+
+     <span class="keyword">auto</span> <span class="identifier">read</span> <span class="special">=</span> <span class="identifier">co_await</span> <span class="identifier">stream</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span>
+         <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">buf</span><span class="special">),</span> <span class="identifier">deferred</span><span class="special">);</span>
+
+     <span class="keyword">if</span> <span class="special">(</span><span class="identifier">read</span> <span class="special">==</span> <span class="number">0u</span><span class="special">)</span>
+       <span class="keyword">continue</span><span class="special">;</span>
+
+     <span class="identifier">co_yield</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string_view</span> <span class="special">{</span> <span class="identifier">buf</span><span class="special">.</span><span class="identifier">data</span><span class="special">(),</span> <span class="identifier">read</span> <span class="special">};</span>
+   <span class="special">}</span>
+<span class="special">}</span>
+
+<span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">&gt;</span> <span class="identifier">line_logger</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">stream</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">lines_read</span> <span class="special">=</span> <span class="number">0u</span><span class="special">;</span>
+  <span class="keyword">auto</span> <span class="identifier">reader</span> <span class="special">=</span> <span class="identifier">line_reader</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">stream</span><span class="special">));</span>
+  <span class="keyword">while</span> <span class="special">(</span><span class="keyword">auto</span> <span class="identifier">l</span> <span class="special">=</span> <span class="identifier">co_await</span> <span class="identifier">reader</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Read: '"</span> <span class="special">&lt;&lt;</span> <span class="special">*</span><span class="identifier">l</span> <span class="special">&lt;&lt;</span> <span class="string">"'"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
+    <span class="identifier">lines_read</span><span class="special">++;</span>
+  <span class="special">}</span>
+  <span class="identifier">co_return</span> <span class="identifier">lines_read</span><span class="special">;</span>
+<span class="special">}</span>
+
+<span class="keyword">void</span> <span class="identifier">read_lines</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">sock</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="identifier">co_spawn</span><span class="special">(</span><span class="identifier">line_logger</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">sock</span><span class="special">),</span>
+      <span class="special">[](</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">lines</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="identifier">std</span><span class="special">::</span><span class="identifier">clog</span> <span class="special">&lt;&lt;</span> <span class="string">"Read "</span> <span class="special">&lt;&lt;</span> <span class="identifier">lines</span> <span class="special">&lt;&lt;</span> <span class="string">" lines"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
+      <span class="special">}));</span>
+<span class="special">}</span>
+</pre>
+<p>
+          A <a class="link" href="../../reference/experimental__coro.html" title="experimental::coro"><code class="computeroutput"><span class="identifier">coro</span></code></a>
+          is highly configurable, so that it can cover a set of different use cases.
+        </p>
+<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
+    <span class="keyword">typename</span> <span class="identifier">Yield</span><span class="special">,</span>
+    <span class="keyword">typename</span> <span class="identifier">Return</span> <span class="special">=</span> <span class="keyword">void</span><span class="special">,</span>
+    <span class="keyword">typename</span> <span class="identifier">Executor</span> <span class="special">=</span> <span class="identifier">any_io_executor</span><span class="special">&gt;</span>
+<span class="keyword">struct</span> <span class="identifier">coro</span><span class="special">;</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.coro.h0"></a>
+          <span><a name="asio.overview.composition.coro.yield"></a></span><a class="link" href="coro.html#asio.overview.composition.coro.yield">Yield</a>
+        </h6>
+<p>
+          The <code class="computeroutput"><span class="identifier">Yield</span></code> parameter designates
+          how a <code class="computeroutput"><span class="identifier">co_yield</span></code> statement
+          behaves. It can either be a type, like <code class="computeroutput"><span class="keyword">int</span></code>
+          or a signature with zero or one types:
+        </p>
+<pre class="programlisting"><span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="comment">// A coroutine with no yield</span>
+<span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="comment">// A coroutine that can yield int</span>
+
+<span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">()&gt;</span> <span class="comment">// A coroutine with no yield</span>
+<span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">()&gt;</span> <span class="comment">// A coroutine that can yield int</span>
+
+<span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">(</span><span class="keyword">double</span><span class="special">)&gt;</span> <span class="comment">// A coroutine that can yield int and receive double</span>
+</pre>
+<p>
+          Receiving a value means that the <code class="computeroutput"><span class="identifier">co_yield</span></code>
+          statement returns a value.
+        </p>
+<pre class="programlisting"><span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">(</span><span class="keyword">int</span><span class="special">)&gt;</span> <span class="identifier">my_sum</span><span class="special">(</span><span class="identifier">any_io_executor</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">int</span> <span class="identifier">value</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
+  <span class="keyword">while</span> <span class="special">(</span><span class="keyword">true</span><span class="special">)</span>
+    <span class="identifier">value</span> <span class="special">+=</span> <span class="identifier">co_yield</span> <span class="identifier">value</span><span class="special">;</span> <span class="comment">//sum up all values</span>
+<span class="special">}</span>
+</pre>
+<p>
+          Putting values into a coroutine can be done it two ways: either by direct
+          resumption (from another coro) or through async_resume. The first value
+          gets ignored because the coroutines are lazy.
+        </p>
+<pre class="programlisting"><span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">c</span><span class="special">(</span><span class="identifier">any_io_executor</span> <span class="identifier">exec</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">auto</span> <span class="identifier">sum</span> <span class="special">=</span> <span class="identifier">my_sum</span><span class="special">(</span><span class="identifier">exec</span><span class="special">);</span>
+  <span class="identifier">assert</span><span class="special">(</span><span class="number">0</span>  <span class="special">==</span> <span class="identifier">co_await</span> <span class="identifier">sum</span><span class="special">(-</span><span class="number">1</span><span class="special">));</span>
+  <span class="identifier">assert</span><span class="special">(</span><span class="number">0</span>  <span class="special">==</span> <span class="identifier">co_await</span> <span class="identifier">sum</span><span class="special">(</span><span class="number">10</span><span class="special">));</span>
+  <span class="identifier">assert</span><span class="special">(</span><span class="number">10</span> <span class="special">==</span> <span class="identifier">co_await</span> <span class="identifier">sum</span><span class="special">(</span><span class="number">15</span><span class="special">));</span>
+  <span class="identifier">assert</span><span class="special">(</span><span class="number">25</span> <span class="special">==</span> <span class="identifier">co_await</span> <span class="identifier">sum</span><span class="special">(</span><span class="number">0</span><span class="special">));</span>
+<span class="special">}</span>
+
+<span class="identifier">awaitable</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">a</span><span class="special">()</span>
+<span class="special">{</span>
+  <span class="keyword">auto</span> <span class="identifier">sum</span> <span class="special">=</span> <span class="identifier">my_sum</span><span class="special">(</span><span class="identifier">co_await</span> <span class="identifier">this_coro</span><span class="special">::</span><span class="identifier">executor</span><span class="special">);</span>
+  <span class="identifier">assert</span><span class="special">(</span><span class="number">0</span>  <span class="special">==</span> <span class="identifier">co_await</span> <span class="identifier">sum</span><span class="special">.</span><span class="identifier">async_resume</span><span class="special">(-</span><span class="number">1</span><span class="special">,</span> <span class="identifier">use_awaitable</span><span class="special">));</span>
+  <span class="identifier">assert</span><span class="special">(</span><span class="number">0</span>  <span class="special">==</span> <span class="identifier">co_await</span> <span class="identifier">sum</span><span class="special">.</span><span class="identifier">async_resume</span><span class="special">(</span><span class="number">10</span><span class="special">,</span> <span class="identifier">use_awaitable</span><span class="special">));</span>
+  <span class="identifier">assert</span><span class="special">(</span><span class="number">10</span> <span class="special">==</span> <span class="identifier">co_await</span> <span class="identifier">sum</span><span class="special">.</span><span class="identifier">async_resume</span><span class="special">(</span><span class="number">15</span><span class="special">,</span> <span class="identifier">use_awaitable</span><span class="special">));</span>
+  <span class="identifier">assert</span><span class="special">(</span><span class="number">25</span> <span class="special">==</span> <span class="identifier">co_await</span> <span class="identifier">sum</span><span class="special">.</span><span class="identifier">async_resume</span><span class="special">(</span><span class="number">0</span><span class="special">,</span> <span class="identifier">use_awaitable</span><span class="special">));</span>
+<span class="special">}</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.coro.h1"></a>
+          <span><a name="asio.overview.composition.coro._code__phrase_role__keyword__noexcept__phrase___code_"></a></span><a class="link" href="coro.html#asio.overview.composition.coro._code__phrase_role__keyword__noexcept__phrase___code_"><code class="computeroutput"><span class="keyword">noexcept</span></code></a>
+        </h6>
+<p>
+          A coro may be noexcept:
+        </p>
+<pre class="programlisting"><span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">&gt;</span> <span class="identifier">c</span><span class="special">;</span>
+<span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">&gt;</span> <span class="identifier">c</span><span class="special">;</span>
+<span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">(</span><span class="keyword">double</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">&gt;</span> <span class="identifier">c</span><span class="special">;</span>
+</pre>
+<p>
+          This will change its @c async_resume signature, from <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span><span class="special">)</span></code> to <code class="computeroutput"><span class="keyword">void</span><span class="special">()</span></code> or <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span><span class="special">,</span> <span class="identifier">T</span><span class="special">)</span></code>
+          to <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span></code>. A
+          noexcept coro that ends with an exception will cause <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">terminate</span></code>
+          to be called.
+        </p>
+<p>
+          Furthermore, calls of <code class="computeroutput"><span class="identifier">async_resume</span></code>
+          and <code class="computeroutput"><span class="identifier">co_await</span></code> of an expired
+          noexcept coro will cause undefined behaviour.
+        </p>
+<h6>
+<a name="asio.overview.composition.coro.h2"></a>
+          <span><a name="asio.overview.composition.coro.return"></a></span><a class="link" href="coro.html#asio.overview.composition.coro.return">Return</a>
+        </h6>
+<p>
+          A coro can also define a type that can be used with <code class="computeroutput"><span class="identifier">co_return</span></code>:
+        </p>
+<pre class="programlisting"><span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">c</span><span class="special">(</span><span class="identifier">any_io_executor</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="identifier">co_return</span> <span class="number">42</span><span class="special">;</span>
+<span class="special">}</span>
+</pre>
+<p>
+          A coro can have both a <code class="computeroutput"><span class="identifier">Yield</span></code>
+          and <code class="computeroutput"><span class="identifier">Return</span></code> that are non
+          void at the same time.
+        </p>
+<h6>
+<a name="asio.overview.composition.coro.h3"></a>
+          <span><a name="asio.overview.composition.coro.result"></a></span><a class="link" href="coro.html#asio.overview.composition.coro.result">Result</a>
+        </h6>
+<p>
+          The result type of a coroutine is dermined by both <code class="computeroutput"><span class="identifier">Yield</span></code>
+          and <code class="computeroutput"><span class="identifier">Return</span></code>. Note that in
+          the follwing table only the yield output value is considered, i.e. <code class="computeroutput"><span class="identifier">T</span><span class="special">(</span><span class="identifier">U</span><span class="special">)</span></code> means <code class="computeroutput"><span class="identifier">T</span></code>.
+        </p>
+<div class="table">
+<a name="asio.overview.composition.coro.result_type"></a><p class="title"><b>Table 2. Result type deduction</b></p>
+<div class="table-contents"><table class="table" summary="Result type deduction">
+<colgroup>
+<col>
+<col>
+<col>
+<col>
+<col>
+</colgroup>
+<thead><tr>
+<th>
+                  <p>
+                    Yield
+                  </p>
+                </th>
+<th>
+                  <p>
+                    Return
+                  </p>
+                </th>
+<th>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">noexcept</span></code>
+                  </p>
+                </th>
+<th>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">result_type</span></code>
+                  </p>
+                </th>
+<th>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">completion_signature</span></code>
+                  </p>
+                </th>
+</tr></thead>
+<tbody>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">T</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">U</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">false</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">variant</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span>
+                    <span class="identifier">U</span><span class="special">&gt;</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span><span class="special">,</span>
+                    <span class="identifier">variant</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span>
+                    <span class="identifier">U</span><span class="special">&gt;)</span></code>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">T</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">U</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">true</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">variant</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span>
+                    <span class="identifier">U</span><span class="special">&gt;</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="identifier">variant</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span>
+                    <span class="identifier">U</span><span class="special">&gt;)</span></code>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">T</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">false</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span><span class="special">,</span>
+                    <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;)</span></code>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">T</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">true</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;)</span></code>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">false</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span><span class="special">)</span></code>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">true</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span><span class="special">()</span></code>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">T</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">false</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span><span class="special">,</span>
+                    <span class="identifier">T</span><span class="special">)</span></code>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">T</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">true</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span></code>
+                  </p>
+                </td>
+</tr>
+</tbody>
+</table></div>
+</div>
+<br class="table-break"><h6>
+<a name="asio.overview.composition.coro.h4"></a>
+          <span><a name="asio.overview.composition.coro.executor"></a></span><a class="link" href="coro.html#asio.overview.composition.coro.executor">Executor</a>
+        </h6>
+<p>
+          Every coroutine needs to have its own executor. Since the coroutine gets
+          called multiple times, it cannot take the executor from the caller like
+          an <code class="computeroutput"><span class="identifier">awaitable</span></code>. Therefore
+          a <code class="computeroutput"><span class="identifier">coro</span></code> requires to get
+          an executor or an execution_context passed in as the first parameter.
+        </p>
+<pre class="programlisting"><span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">with_executor</span><span class="special">(</span><span class="identifier">any_io_executor</span><span class="special">);</span>
+<span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">with_context</span><span class="special">(</span><span class="identifier">io_context</span> <span class="special">&amp;);</span>
+</pre>
+<p>
+          It is to note, that an execution_context is defined as loosely as possible.
+          An execution context is any object that has a <code class="computeroutput"><span class="identifier">get_executor</span><span class="special">()</span></code> function, which returns an executor that
+          can be transformed into the executor_type of the coroutine. This allows
+          most io_objects to be used as the source of the executor:
+        </p>
+<pre class="programlisting"><span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">with_socket</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">);</span>
+</pre>
+<p>
+          Additionally, a <code class="computeroutput"><span class="identifier">coro</span></code> that
+          is a member function will check the <code class="computeroutput"><span class="keyword">this</span></code>
+          pointer as well, either if it's an executor or an execution context:
+        </p>
+<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">my_io_object</span>
+<span class="special">{</span>
+  <span class="identifier">any_io_executor</span> <span class="identifier">get_executor</span><span class="special">();</span>
+
+  <span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">my_coro</span><span class="special">();</span>
+<span class="special">};</span>
+</pre>
+<p>
+          Finally, a member coro can be given an explicit executor or execution context,
+          to override the one of the object:
+        </p>
+<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">my_io_object</span>
+<span class="special">{</span>
+  <span class="identifier">any_io_executor</span> <span class="identifier">get_executor</span><span class="special">();</span>
+
+  <span class="identifier">coro</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">my_coro</span><span class="special">(</span><span class="identifier">any_io_executor</span> <span class="identifier">exec</span><span class="special">);</span> <span class="comment">// it will use exec</span>
+<span class="special">};</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.coro.h5"></a>
+          <span><a name="asio.overview.composition.coro._code__phrase_role__identifier__co_await__phrase___code_"></a></span><a class="link" href="coro.html#asio.overview.composition.coro._code__phrase_role__identifier__co_await__phrase___code_"><code class="computeroutput"><span class="identifier">co_await</span></code></a>
+        </h6>
+<p>
+          The @c co_await within a <code class="computeroutput"><span class="identifier">coro</span></code>
+          is not the same as <code class="computeroutput"><span class="identifier">async_resume</span><span class="special">(</span><span class="identifier">deferred</span><span class="special">)</span></code>, unless both coros use different executors.
+          If they use the same, the <code class="computeroutput"><span class="identifier">coro</span></code>
+          will direclty suspend and resume the executor, without any usage of the
+          executor.
+        </p>
+<p>
+          <code class="computeroutput"><span class="identifier">co_await</span> <span class="identifier">this_coro</span><span class="special">::</span></code> behaves the same as coroutines that use
+          @c asio::awaitable.
+        </p>
+<h6>
+<a name="asio.overview.composition.coro.h6"></a>
+          <span><a name="asio.overview.composition.coro.integrating_with_awaitable"></a></span><a class="link" href="coro.html#asio.overview.composition.coro.integrating_with_awaitable">Integrating
+          with awaitable</a>
+        </h6>
+<p>
+          As the <code class="computeroutput"><span class="identifier">coro</span></code> member function
+          <code class="computeroutput"><span class="identifier">async_resume</span></code> is an asynchronous
+          operation, it may also be used in conjunction with <code class="computeroutput"><span class="identifier">awaitable</span></code>
+          coroutines in a single control flow. For example:
+        </p>
+<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">asio</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
+<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">asio</span><span class="special">/</span><span class="identifier">experimental</span><span class="special">/</span><span class="identifier">coro</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
+
+<span class="keyword">using</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">;</span>
+
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">coro</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;</span> <span class="identifier">reader</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&amp;</span> <span class="identifier">sock</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">buf</span><span class="special">;</span>
+  <span class="keyword">while</span> <span class="special">(</span><span class="identifier">sock</span><span class="special">.</span><span class="identifier">is_open</span><span class="special">())</span>
+  <span class="special">{</span>
+    <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">co_await</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_read_until</span><span class="special">(</span>
+        <span class="identifier">sock</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">dynamic_buffer</span><span class="special">(</span><span class="identifier">buf</span><span class="special">),</span> <span class="char">'\n'</span><span class="special">,</span>
+        <span class="identifier">asio</span><span class="special">::</span><span class="identifier">deferred</span><span class="special">);</span>
+    <span class="identifier">co_yield</span> <span class="identifier">buf</span><span class="special">.</span><span class="identifier">substr</span><span class="special">(</span><span class="number">0</span><span class="special">,</span> <span class="identifier">n</span><span class="special">);</span>
+    <span class="identifier">buf</span><span class="special">.</span><span class="identifier">erase</span><span class="special">(</span><span class="number">0</span><span class="special">,</span> <span class="identifier">n</span><span class="special">);</span>
+  <span class="special">}</span>
+<span class="special">}</span>
+
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">consumer</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">sock</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">auto</span> <span class="identifier">r</span> <span class="special">=</span> <span class="identifier">reader</span><span class="special">(</span><span class="identifier">sock</span><span class="special">);</span>
+  <span class="keyword">auto</span> <span class="identifier">msg1</span> <span class="special">=</span> <span class="identifier">co_await</span> <span class="identifier">r</span><span class="special">.</span><span class="identifier">async_resume</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable</span><span class="special">);</span>
+  <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Message 1: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">msg1</span><span class="special">.</span><span class="identifier">value_or</span><span class="special">(</span><span class="string">"\n"</span><span class="special">);</span>
+  <span class="keyword">auto</span> <span class="identifier">msg2</span> <span class="special">=</span> <span class="identifier">co_await</span> <span class="identifier">r</span><span class="special">.</span><span class="identifier">async_resume</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable</span><span class="special">);</span>
+  <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Message 2: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">msg2</span><span class="special">.</span><span class="identifier">value_or</span><span class="special">(</span><span class="string">"\n"</span><span class="special">);</span>
+<span class="special">}</span>
+
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">listen</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">acceptor</span><span class="special">&amp;</span> <span class="identifier">acceptor</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">for</span> <span class="special">(;;)</span>
+  <span class="special">{</span>
+    <span class="identifier">co_spawn</span><span class="special">(</span>
+        <span class="identifier">acceptor</span><span class="special">.</span><span class="identifier">get_executor</span><span class="special">(),</span>
+        <span class="identifier">consumer</span><span class="special">(</span><span class="identifier">co_await</span> <span class="identifier">acceptor</span><span class="special">.</span><span class="identifier">async_accept</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable</span><span class="special">)),</span>
+        <span class="identifier">asio</span><span class="special">::</span><span class="identifier">detached</span><span class="special">);</span>
+  <span class="special">}</span>
+<span class="special">}</span>
+
+<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
+<span class="special">{</span>
+  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span> <span class="identifier">ctx</span><span class="special">;</span>
+  <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">acceptor</span> <span class="identifier">acceptor</span><span class="special">(</span><span class="identifier">ctx</span><span class="special">,</span> <span class="special">{</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">v4</span><span class="special">(),</span> <span class="number">54321</span><span class="special">});</span>
+  <span class="identifier">co_spawn</span><span class="special">(</span><span class="identifier">ctx</span><span class="special">,</span> <span class="identifier">listen</span><span class="special">(</span><span class="identifier">acceptor</span><span class="special">),</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">detached</span><span class="special">);</span>
+  <span class="identifier">ctx</span><span class="special">.</span><span class="identifier">run</span><span class="special">();</span>
+<span class="special">}</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.coro.h7"></a>
+          <span><a name="asio.overview.composition.coro.see_also"></a></span><a class="link" href="coro.html#asio.overview.composition.coro.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/co_spawn.html" title="co_spawn">co_spawn</a>, <a class="link" href="../../reference/experimental__coro.html" title="experimental::coro">experimental::coro</a>,
+          <a class="link" href="cpp20_coroutines.html" title="C++20 Coroutines Support">C++20 Coroutines</a>,
+          <a class="link" href="spawn.html" title="Stackful Coroutines">Stackful Coroutines</a>,
+          <a class="link" href="coroutine.html" title="Stackless Coroutines">Stackless Coroutines</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cpp20_coroutines.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="deferred.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

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@@ -0,0 +1,82 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Stackless Coroutines</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../composition.html" title="Composition and Completion Tokens">
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+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../composition.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="spawn.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.composition.coroutine"></a><a class="link" href="coroutine.html" title="Stackless Coroutines">Stackless Coroutines</a>
+</h4></div></div></div>
+<p>
+          The <a class="link" href="../../reference/coroutine.html" title="coroutine"><code class="computeroutput"><span class="identifier">coroutine</span></code></a>
+          class provides support for stackless coroutines. Stackless coroutines enable
+          programs to implement asynchronous logic in a synchronous manner, with
+          minimal overhead, as shown in the following example:
+        </p>
+<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">session</span> <span class="special">:</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">coroutine</span>
+<span class="special">{</span>
+  <span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&gt;</span> <span class="identifier">socket_</span><span class="special">;</span>
+  <span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">buffer_</span><span class="special">;</span>
+
+  <span class="identifier">session</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&gt;</span> <span class="identifier">socket</span><span class="special">)</span>
+    <span class="special">:</span> <span class="identifier">socket_</span><span class="special">(</span><span class="identifier">socket</span><span class="special">),</span>
+      <span class="identifier">buffer_</span><span class="special">(</span><span class="keyword">new</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">&gt;(</span><span class="number">1024</span><span class="special">))</span>
+  <span class="special">{</span>
+  <span class="special">}</span>
+
+  <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span> <span class="special">=</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">(),</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">ec</span><span class="special">)</span> <span class="identifier">reenter</span> <span class="special">(</span><span class="keyword">this</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="keyword">for</span> <span class="special">(;;)</span>
+      <span class="special">{</span>
+        <span class="identifier">yield</span> <span class="identifier">socket_</span><span class="special">-&gt;</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(*</span><span class="identifier">buffer_</span><span class="special">),</span> <span class="special">*</span><span class="keyword">this</span><span class="special">);</span>
+        <span class="identifier">yield</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_write</span><span class="special">(*</span><span class="identifier">socket_</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(*</span><span class="identifier">buffer_</span><span class="special">,</span> <span class="identifier">n</span><span class="special">),</span> <span class="special">*</span><span class="keyword">this</span><span class="special">);</span>
+      <span class="special">}</span>
+    <span class="special">}</span>
+  <span class="special">}</span>
+<span class="special">};</span>
+</pre>
+<p>
+          The <code class="computeroutput"><span class="identifier">coroutine</span></code> class is
+          used in conjunction with the pseudo-keywords <code class="computeroutput"><span class="identifier">reenter</span></code>,
+          <code class="computeroutput"><span class="identifier">yield</span></code> and <code class="computeroutput"><span class="identifier">fork</span></code>. These are preprocessor macros,
+          and are implemented in terms of a <code class="computeroutput"><span class="keyword">switch</span></code>
+          statement using a technique similar to Duff's Device. The <a class="link" href="../../reference/coroutine.html" title="coroutine"><code class="computeroutput"><span class="identifier">coroutine</span></code></a> class's documentation
+          provides a complete description of these pseudo-keywords.
+        </p>
+<h6>
+<a name="asio.overview.composition.coroutine.h0"></a>
+          <span><a name="asio.overview.composition.coroutine.see_also"></a></span><a class="link" href="coroutine.html#asio.overview.composition.coroutine.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/coroutine.html" title="coroutine">coroutine</a>, <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.http_server_4">HTTP
+          Server 4 example</a>, <a class="link" href="spawn.html" title="Stackful Coroutines">Stackful
+          Coroutines</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../composition.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="spawn.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/composition/cpp20_coroutines.html

@@ -0,0 +1,360 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>C++20 Coroutines Support</title>
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+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="futures.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="coro.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.composition.cpp20_coroutines"></a><a class="link" href="cpp20_coroutines.html" title="C++20 Coroutines Support">C++20 Coroutines
+        Support</a>
+</h4></div></div></div>
+<p>
+          Support for C++20 Coroutines is provided via the <a class="link" href="../../reference/awaitable.html" title="awaitable"><code class="computeroutput"><span class="identifier">awaitable</span></code></a> class template, the
+          <a class="link" href="../../reference/use_awaitable_t.html" title="use_awaitable_t"><code class="computeroutput"><span class="identifier">use_awaitable</span></code></a>
+          completion token, and the <a class="link" href="../../reference/co_spawn.html" title="co_spawn"><code class="computeroutput"><span class="identifier">co_spawn</span><span class="special">()</span></code></a>
+          function. These facilities allow programs to implement asynchronous logic
+          in a synchronous manner, in conjunction with the <code class="computeroutput"><span class="identifier">co_await</span></code>
+          keyword, as shown in the following example:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">co_spawn</span><span class="special">(</span><span class="identifier">executor</span><span class="special">,</span> <span class="identifier">echo</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">socket</span><span class="special">)),</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">detached</span><span class="special">);</span>
+
+<span class="comment">// ...</span>
+
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">echo</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">try</span>
+  <span class="special">{</span>
+    <span class="keyword">char</span> <span class="identifier">data</span><span class="special">[</span><span class="number">1024</span><span class="special">];</span>
+    <span class="keyword">for</span> <span class="special">(;;)</span>
+    <span class="special">{</span>
+      <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">co_await</span> <span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">),</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable</span><span class="special">);</span>
+      <span class="identifier">co_await</span> <span class="identifier">async_write</span><span class="special">(</span><span class="identifier">socket</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">,</span> <span class="identifier">n</span><span class="special">),</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable</span><span class="special">);</span>
+    <span class="special">}</span>
+  <span class="special">}</span>
+  <span class="keyword">catch</span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception</span><span class="special">&amp;</span> <span class="identifier">e</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="identifier">std</span><span class="special">::</span><span class="identifier">printf</span><span class="special">(</span><span class="string">"echo Exception: %s\n"</span><span class="special">,</span> <span class="identifier">e</span><span class="special">.</span><span class="identifier">what</span><span class="special">());</span>
+  <span class="special">}</span>
+<span class="special">}</span>
+</pre>
+<p>
+          The first argument to <code class="computeroutput"><span class="identifier">co_spawn</span><span class="special">()</span></code> is an <a class="link" href="../../reference/Executor1.html" title="Executor requirements">executor</a>
+          that determines the context in which the coroutine is permitted to execute.
+          For example, a server's per-client object may consist of multiple coroutines;
+          they should all run on the same <code class="computeroutput"><span class="identifier">strand</span></code>
+          so that no explicit synchronisation is required.
+        </p>
+<p>
+          The second argument is an <a class="link" href="../../reference/awaitable.html" title="awaitable"><code class="computeroutput"><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="identifier">R</span><span class="special">&gt;</span></code></a>,
+          that is the result of the coroutine's entry point function, and in the
+          above example is the result of the call to <code class="computeroutput"><span class="identifier">echo</span></code>.
+          (Alternatively, this argument can be a function object that returns the
+          <a class="link" href="../../reference/awaitable.html" title="awaitable"><code class="computeroutput"><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="identifier">R</span><span class="special">&gt;</span></code></a>.) The template parameter <code class="computeroutput"><span class="identifier">R</span></code> is the type of return value produced
+          by the coroutine. In the above example, the coroutine returns <code class="computeroutput"><span class="keyword">void</span></code>.
+        </p>
+<p>
+          The third argument is a completion token, and this is used by <code class="computeroutput"><span class="identifier">co_spawn</span><span class="special">()</span></code>
+          to produce a completion handler with signature <code class="computeroutput"><span class="keyword">void</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception_ptr</span><span class="special">,</span> <span class="identifier">R</span><span class="special">)</span></code>.
+          This completion handler is invoked with the result of the coroutine once
+          it has finished. In the above example we pass a completion token type,
+          <a class="link" href="../../reference/detached.html" title="detached"><code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">detached</span></code></a>,
+          which is used to explicitly ignore the result of an asynchronous operation.
+        </p>
+<p>
+          In this example the body of the coroutine is implemented in the <code class="computeroutput"><span class="identifier">echo</span></code> function. When the <code class="computeroutput"><span class="identifier">use_awaitable</span></code> completion token is passed
+          to an asynchronous operation, the operation's initiating function returns
+          an <code class="computeroutput"><span class="identifier">awaitable</span></code> that may be
+          used with the <code class="computeroutput"><span class="identifier">co_await</span></code>
+          keyword:
+        </p>
+<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">co_await</span> <span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">),</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable</span><span class="special">);</span>
+</pre>
+<p>
+          Where an asynchronous operation's handler signature has the form:
+        </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">,</span> <span class="identifier">result_type</span> <span class="identifier">result</span><span class="special">);</span>
+</pre>
+<p>
+          the resulting type of the <code class="computeroutput"><span class="identifier">co_await</span></code>
+          expression is <code class="computeroutput"><span class="identifier">result_type</span></code>.
+          In the <code class="computeroutput"><span class="identifier">async_read_some</span></code>
+          example above, this is <code class="computeroutput"><span class="identifier">size_t</span></code>.
+          If the asynchronous operation fails, the <code class="computeroutput"><span class="identifier">error_code</span></code>
+          is converted into a <code class="computeroutput"><span class="identifier">system_error</span></code>
+          exception and thrown.
+        </p>
+<p>
+          Where a handler signature has the form:
+        </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">);</span>
+</pre>
+<p>
+          the <code class="computeroutput"><span class="identifier">co_await</span></code> expression
+          produces a <code class="computeroutput"><span class="keyword">void</span></code> result. As
+          above, an error is passed back to the coroutine as a <code class="computeroutput"><span class="identifier">system_error</span></code>
+          exception.
+        </p>
+<h6>
+<a name="asio.overview.composition.cpp20_coroutines.h0"></a>
+          <span><a name="asio.overview.composition.cpp20_coroutines.error_handling"></a></span><a class="link" href="cpp20_coroutines.html#asio.overview.composition.cpp20_coroutines.error_handling">Error
+          Handling</a>
+        </h6>
+<p>
+          To perform explicit error handling, rather than the default exception-throwing
+          behaviour, use the <a class="link" href="../../reference/as_tuple.html" title="as_tuple"><code class="computeroutput"><span class="identifier">as_tuple</span></code></a> or <a class="link" href="../../reference/redirect_error.html" title="redirect_error"><code class="computeroutput"><span class="identifier">redirect_error</span></code></a> completion token
+          adapters.
+        </p>
+<p>
+          The <code class="computeroutput"><span class="identifier">as_tuple</span></code> completion
+          token adapter packages the completion handler arguments into a single tuple,
+          which is then returned as the result of the awaited operation. For example:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">echo</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">char</span> <span class="identifier">data</span><span class="special">[</span><span class="number">1024</span><span class="special">];</span>
+  <span class="keyword">for</span> <span class="special">(;;)</span>
+  <span class="special">{</span>
+    <span class="identifier">std</span><span class="special">::</span><span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">&gt;</span> <span class="identifier">result</span> <span class="special">=</span>
+      <span class="identifier">co_await</span> <span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">),</span>
+        <span class="identifier">asio</span><span class="special">::</span><span class="identifier">as_tuple</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable</span><span class="special">));</span>
+    <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">get</span><span class="special">&lt;</span><span class="number">0</span><span class="special">&gt;(</span><span class="identifier">result</span><span class="special">))</span>
+    <span class="special">{</span>
+      <span class="comment">// success</span>
+    <span class="special">}</span>
+
+    <span class="comment">// ...</span>
+  <span class="special">}</span>
+<span class="special">}</span>
+</pre>
+<p>
+          The result can also be captured directly into a structured binding:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">echo</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">char</span> <span class="identifier">data</span><span class="special">[</span><span class="number">1024</span><span class="special">];</span>
+  <span class="keyword">for</span> <span class="special">(;;)</span>
+  <span class="special">{</span>
+    <span class="keyword">auto</span> <span class="special">[</span><span class="identifier">ec</span><span class="special">,</span> <span class="identifier">n</span><span class="special">]</span> <span class="special">=</span> <span class="identifier">co_await</span> <span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span>
+        <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">),</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">as_tuple</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable</span><span class="special">));</span>
+    <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">ec</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="comment">// success</span>
+    <span class="special">}</span>
+
+    <span class="comment">// ...</span>
+  <span class="special">}</span>
+<span class="special">}</span>
+</pre>
+<p>
+          Alternatively, the <code class="computeroutput"><span class="identifier">redirect_error</span></code>
+          completion token adapter may be used to capture the error into a supplied
+          <code class="computeroutput"><span class="identifier">error_code</span></code> variable:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">echo</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">char</span> <span class="identifier">data</span><span class="special">[</span><span class="number">1024</span><span class="special">];</span>
+  <span class="keyword">for</span> <span class="special">(;;)</span>
+  <span class="special">{</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">;</span>
+    <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">co_await</span> <span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">),</span>
+        <span class="identifier">asio</span><span class="special">::</span><span class="identifier">redirect_error</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">));</span>
+    <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">ec</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="comment">// success</span>
+    <span class="special">}</span>
+
+    <span class="comment">// ...</span>
+  <span class="special">}</span>
+<span class="special">}</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.cpp20_coroutines.h1"></a>
+          <span><a name="asio.overview.composition.cpp20_coroutines.coroutines_and_per_operation_cancellation"></a></span><a class="link" href="cpp20_coroutines.html#asio.overview.composition.cpp20_coroutines.coroutines_and_per_operation_cancellation">Coroutines
+          and Per-Operation Cancellation</a>
+        </h6>
+<p>
+          All threads of execution created by <code class="computeroutput"><span class="identifier">co_spawn</span></code>
+          have a cancellation state that records the current state of any cancellation
+          requests made to the coroutine. To access this state, use <a class="link" href="../../reference/this_coro__cancellation_state.html" title="this_coro::cancellation_state"><code class="computeroutput"><span class="identifier">this_coro</span><span class="special">::</span><span class="identifier">cancellation_state</span></code></a> as follows:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">my_coroutine</span><span class="special">()</span>
+<span class="special">{</span>
+  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">cancellation_state</span> <span class="identifier">cs</span>
+    <span class="special">=</span> <span class="identifier">co_await</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">this_coro</span><span class="special">::</span><span class="identifier">cancellation_state</span><span class="special">;</span>
+
+  <span class="comment">// ...</span>
+
+  <span class="keyword">if</span> <span class="special">(</span><span class="identifier">cs</span><span class="special">.</span><span class="identifier">cancelled</span><span class="special">()</span> <span class="special">!=</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">cancellation_type</span><span class="special">::</span><span class="identifier">none</span><span class="special">)</span>
+    <span class="comment">// ...</span>
+<span class="special">}</span>
+</pre>
+<p>
+          When first created by <code class="computeroutput"><span class="identifier">co_spawn</span></code>,
+          the thread of execution has a cancellation state that supports <code class="computeroutput"><span class="identifier">cancellation_type</span><span class="special">::</span><span class="identifier">terminal</span></code> values only. To change the cancellation
+          state, call <a class="link" href="../../reference/this_coro__reset_cancellation_state.html" title="this_coro::reset_cancellation_state"><code class="computeroutput"><span class="identifier">this_coro</span><span class="special">::</span><span class="identifier">reset_cancellation_state</span></code></a>.
+        </p>
+<p>
+          By default, continued execution of a cancelled coroutine will trigger an
+          exception from any subsequent <code class="computeroutput"><span class="identifier">co_await</span></code>
+          of an <code class="computeroutput"><span class="identifier">awaitable</span><span class="special">&lt;&gt;</span></code>
+          object. This behaviour can be changed by using <a class="link" href="../../reference/this_coro__throw_if_cancelled.html" title="this_coro::throw_if_cancelled"><code class="computeroutput"><span class="identifier">this_coro</span><span class="special">::</span><span class="identifier">throw_if_cancelled</span></code></a>.
+        </p>
+<h6>
+<a name="asio.overview.composition.cpp20_coroutines.h2"></a>
+          <span><a name="asio.overview.composition.cpp20_coroutines.co_ordinating_parallel_coroutines"></a></span><a class="link" href="cpp20_coroutines.html#asio.overview.composition.cpp20_coroutines.co_ordinating_parallel_coroutines">Co-ordinating
+          Parallel Coroutines</a>
+        </h6>
+<div class="note"><table border="0" summary="Note">
+<tr>
+<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../note.png"></td>
+<th align="left">Note</th>
+</tr>
+<tr><td align="left" valign="top"><p>
+            This is an experimental feature.
+          </p></td></tr>
+</table></div>
+<p>
+          The logical operators <code class="computeroutput"><span class="special">||</span></code> and
+          <code class="computeroutput"><span class="special">&amp;&amp;</span></code> have been overloaded
+          for <code class="computeroutput"><span class="identifier">awaitable</span><span class="special">&lt;&gt;</span></code>,
+          to allow coroutines to be trivially awaited in parallel.
+        </p>
+<p>
+          When awaited using <code class="computeroutput"><span class="special">&amp;&amp;</span></code>,
+          the <code class="computeroutput"><span class="identifier">co_await</span></code> expression
+          waits until both operations have completed successfully. As a "short-circuit"
+          evaluation, if one operation fails with an exception, the other is immediately
+          cancelled. For example:
+        </p>
+<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">&gt;</span> <span class="identifier">results</span> <span class="special">=</span>
+  <span class="identifier">co_await</span> <span class="special">(</span>
+    <span class="identifier">async_read</span><span class="special">(</span><span class="identifier">socket</span><span class="special">,</span> <span class="identifier">input_buffer</span><span class="special">,</span> <span class="identifier">use_awaitable</span><span class="special">)</span>
+      <span class="special">&amp;&amp;</span> <span class="identifier">async_write</span><span class="special">(</span><span class="identifier">socket</span><span class="special">,</span> <span class="identifier">output_buffer</span><span class="special">,</span> <span class="identifier">use_awaitable</span><span class="special">)</span>
+  <span class="special">);</span>
+</pre>
+<p>
+          Following completion of a <code class="computeroutput"><span class="special">&amp;&amp;</span></code>
+          operation, the results of all operations are concatenated into a tuple.
+          In the above example, the first <code class="computeroutput"><span class="identifier">size_t</span></code>
+          represents the non-exceptional component of the <code class="computeroutput"><span class="identifier">async_read</span></code>
+          result, and the second <code class="computeroutput"><span class="identifier">size_t</span></code>
+          is the result of the <code class="computeroutput"><span class="identifier">async_write</span></code>.
+        </p>
+<p>
+          When awaited using <code class="computeroutput"><span class="special">||</span></code>, the
+          <code class="computeroutput"><span class="identifier">co_await</span></code> expression waits
+          until either operation succeeds. As a "short-circuit" evaluation,
+          if one operation succeeds without throwing an exception, the other is immediately
+          cancelled. For example:
+        </p>
+<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">variant</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">monostate</span><span class="special">&gt;</span> <span class="identifier">results</span> <span class="special">=</span>
+  <span class="identifier">co_await</span> <span class="special">(</span>
+    <span class="identifier">async_read</span><span class="special">(</span><span class="identifier">socket</span><span class="special">,</span> <span class="identifier">input_buffer</span><span class="special">,</span> <span class="identifier">use_awaitable</span><span class="special">)</span>
+      <span class="special">||</span> <span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">use_awaitable</span><span class="special">)</span>
+  <span class="special">);</span>
+</pre>
+<p>
+          Following completion of a <code class="computeroutput"><span class="special">||</span></code>
+          operation, the result of the first operation to complete non-exceptionally
+          is placed into a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">variant</span></code>. The active index of the variant
+          reflects which of the operations completed first. In the above example,
+          index <code class="computeroutput"><span class="number">0</span></code> corresponds to the
+          <code class="computeroutput"><span class="identifier">async_read</span></code> operation.
+        </p>
+<p>
+          These operators may be enabled by adding the <code class="computeroutput"><span class="preprocessor">#include</span></code>:
+        </p>
+<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">asio</span><span class="special">/</span><span class="identifier">experimental</span><span class="special">/</span><span class="identifier">awaitable_operators</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
+</pre>
+<p>
+          and then bringing the contents of the <code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">awaitable_operators</span></code>
+          namespace into scope:
+        </p>
+<pre class="programlisting"><span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">awaitable_operators</span><span class="special">;</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.cpp20_coroutines.h3"></a>
+          <span><a name="asio.overview.composition.cpp20_coroutines.lightweight_coroutines_implementing_asynchonous_operations"></a></span><a class="link" href="cpp20_coroutines.html#asio.overview.composition.cpp20_coroutines.lightweight_coroutines_implementing_asynchonous_operations">Lightweight
+          Coroutines Implementing Asynchonous Operations</a>
+        </h6>
+<p>
+          The <code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">co_composed</span></code> template facilitates a lightweight
+          implementation of user-defined asynchronous operations using C++20 coroutines.
+          The following example illustrates a simple asynchronous operation that
+          implements an echo protocol in terms of a coroutine:
+        </p>
+<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CompletionToken</span><span class="special">&gt;</span>
+<span class="keyword">auto</span> <span class="identifier">async_echo</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&amp;</span> <span class="identifier">socket</span><span class="special">,</span>
+    <span class="identifier">CompletionToken</span><span class="special">&amp;&amp;</span> <span class="identifier">token</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">return</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_initiate</span><span class="special">&lt;</span>
+    <span class="identifier">CompletionToken</span><span class="special">,</span> <span class="keyword">void</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">)&gt;(</span>
+      <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">co_composed</span><span class="special">&lt;</span>
+        <span class="keyword">void</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">)&gt;(</span>
+          <span class="special">[](</span><span class="keyword">auto</span> <span class="identifier">state</span><span class="special">,</span> <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&amp;</span> <span class="identifier">socket</span><span class="special">)</span> <span class="special">-&gt;</span> <span class="keyword">void</span>
+          <span class="special">{</span>
+            <span class="keyword">try</span>
+            <span class="special">{</span>
+              <span class="identifier">state</span><span class="special">.</span><span class="identifier">throw_if_cancelled</span><span class="special">(</span><span class="keyword">true</span><span class="special">);</span>
+              <span class="identifier">state</span><span class="special">.</span><span class="identifier">reset_cancellation_state</span><span class="special">(</span>
+                <span class="identifier">asio</span><span class="special">::</span><span class="identifier">enable_terminal_cancellation</span><span class="special">());</span>
+
+              <span class="keyword">for</span> <span class="special">(;;)</span>
+              <span class="special">{</span>
+                <span class="keyword">char</span> <span class="identifier">data</span><span class="special">[</span><span class="number">1024</span><span class="special">];</span>
+                <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">co_await</span> <span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span>
+                    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">),</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">deferred</span><span class="special">);</span>
+
+                <span class="identifier">co_await</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_write</span><span class="special">(</span><span class="identifier">socket</span><span class="special">,</span>
+                    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">,</span> <span class="identifier">n</span><span class="special">),</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">deferred</span><span class="special">);</span>
+              <span class="special">}</span>
+            <span class="special">}</span>
+            <span class="keyword">catch</span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">system_error</span><span class="special">&amp;</span> <span class="identifier">e</span><span class="special">)</span>
+            <span class="special">{</span>
+              <span class="identifier">co_return</span> <span class="special">{</span><span class="identifier">e</span><span class="special">.</span><span class="identifier">code</span><span class="special">()};</span>
+            <span class="special">}</span>
+          <span class="special">},</span> <span class="identifier">socket</span><span class="special">),</span>
+      <span class="identifier">token</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ref</span><span class="special">(</span><span class="identifier">socket</span><span class="special">));</span>
+<span class="special">}</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.cpp20_coroutines.h4"></a>
+          <span><a name="asio.overview.composition.cpp20_coroutines.see_also"></a></span><a class="link" href="cpp20_coroutines.html#asio.overview.composition.cpp20_coroutines.see_also">See Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/co_spawn.html" title="co_spawn">co_spawn</a>, <a class="link" href="../../reference/detached.html" title="detached">detached</a>,
+          <a class="link" href="../../reference/as_tuple.html" title="as_tuple">as_tuple</a>, <a class="link" href="../../reference/redirect_error.html" title="redirect_error">redirect_error</a>,
+          <a class="link" href="../../reference/awaitable.html" title="awaitable">awaitable</a>, <a class="link" href="../../reference/use_awaitable_t.html" title="use_awaitable_t">use_awaitable_t</a>,
+          <a class="link" href="../../reference/use_awaitable.html" title="use_awaitable">use_awaitable</a>, <a class="link" href="../../reference/this_coro__executor.html" title="this_coro::executor">this_coro::executor</a>,
+          <a class="link" href="../../reference/experimental__co_composed.html" title="experimental::co_composed">experimental::co_composed</a>,
+          <a class="link" href="../../examples/cpp17_examples.html#asio.examples.cpp17_examples.coroutines_ts_support">Coroutines
+          examples</a>, <a class="link" href="coro.html" title="Resumable C++ 20 Coroutines">Resumable
+          C++20 Coroutines</a>, <a class="link" href="spawn.html" title="Stackful Coroutines">Stackful
+          Coroutines</a>, <a class="link" href="coroutine.html" title="Stackless Coroutines">Stackless
+          Coroutines</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="futures.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="coro.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/composition/deferred.html

@@ -0,0 +1,86 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Deferred Operations</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../composition.html" title="Composition and Completion Tokens">
+<link rel="prev" href="coro.html" title="Resumable C++ 20 Coroutines">
+<link rel="next" href="promises.html" title="Promises">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="coro.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="promises.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.composition.deferred"></a><a class="link" href="deferred.html" title="Deferred Operations">Deferred Operations</a>
+</h4></div></div></div>
+<p>
+          The <a class="link" href="../../reference/deferred.html" title="deferred"><code class="computeroutput"><span class="identifier">deferred</span></code></a>,
+          completion token takes a call to an asynchronous operation's initiating
+          function and turns it into a function object that accepts a completion
+          token. For example:
+        </p>
+<pre class="programlisting"><span class="keyword">auto</span> <span class="identifier">deferred_op</span> <span class="special">=</span>
+  <span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">deferred</span><span class="special">);</span>
+<span class="special">...</span>
+<span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">deferred_op</span><span class="special">)(</span>
+    <span class="special">[](</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">){</span> <span class="special">...</span> <span class="special">});</span>
+</pre>
+<p>
+          or:
+        </p>
+<pre class="programlisting"><span class="keyword">auto</span> <span class="identifier">deferred_op</span> <span class="special">=</span>
+  <span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">deferred</span><span class="special">);</span>
+<span class="special">...</span>
+<span class="identifier">std</span><span class="special">::</span><span class="identifier">future</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="special">=</span>
+  <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">deferred_op</span><span class="special">)(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_future</span><span class="special">);</span>
+</pre>
+<p>
+          The deferred token also supports chaining, to create simple compositions:
+        </p>
+<pre class="programlisting"><span class="keyword">auto</span> <span class="identifier">deferred_op</span> <span class="special">=</span>
+  <span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">deferred</span><span class="special">(</span>
+      <span class="special">[&amp;](</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="identifier">timer</span><span class="special">.</span><span class="identifier">expires_after</span><span class="special">(</span>
+            <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">1</span><span class="special">));</span>
+
+        <span class="keyword">return</span> <span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
+            <span class="identifier">asio</span><span class="special">::</span><span class="identifier">deferred</span><span class="special">);</span>
+      <span class="special">});</span>
+<span class="special">...</span>
+<span class="identifier">std</span><span class="special">::</span><span class="identifier">future</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">deferred_op</span><span class="special">)(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_future</span><span class="special">);</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.deferred.h0"></a>
+          <span><a name="asio.overview.composition.deferred.see_also"></a></span><a class="link" href="deferred.html#asio.overview.composition.deferred.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/deferred.html" title="deferred">deferred</a>, <a class="link" href="../../reference/deferred_t.html" title="deferred_t">deferred_t</a>,
+          <a class="link" href="../../examples/cpp14_examples.html#asio.examples.cpp14_examples.deferred">Deferred examples
+          (C++11)</a>, <a class="link" href="../../examples/cpp14_examples.html#asio.examples.cpp14_examples.deferred">Deferred
+          examples (C++14)</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="coro.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="promises.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/composition/futures.html

@@ -0,0 +1,78 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Futures</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../composition.html" title="Composition and Completion Tokens">
+<link rel="prev" href="spawn.html" title="Stackful Coroutines">
+<link rel="next" href="cpp20_coroutines.html" title="C++20 Coroutines Support">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="spawn.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="cpp20_coroutines.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.composition.futures"></a><a class="link" href="futures.html" title="Futures">Futures</a>
+</h4></div></div></div>
+<p>
+          The <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_future</span></code> completion token provides
+          first-class support for returning a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">future</span></code>
+          from an asynchronous operation's initiating function.
+        </p>
+<p>
+          To use <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_future</span></code>, pass it to an asynchronous
+          operation instead of a completion handler. For example:
+        </p>
+<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">future</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">&gt;</span> <span class="identifier">length</span> <span class="special">=</span>
+  <span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_future</span><span class="special">);</span>
+</pre>
+<p>
+          Where a completion signature has the form:
+        </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">,</span> <span class="identifier">result_type</span> <span class="identifier">result</span><span class="special">);</span>
+</pre>
+<p>
+          the initiating function returns a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">future</span></code>
+          templated on <code class="computeroutput"><span class="identifier">result_type</span></code>.
+          In the above example, this is <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span></code>.
+          If the asynchronous operation fails, the <code class="computeroutput"><span class="identifier">error_code</span></code>
+          is converted into a <code class="computeroutput"><span class="identifier">system_error</span></code>
+          exception and passed back to the caller through the future.
+        </p>
+<p>
+          Where a completion signature has the form:
+        </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">);</span>
+</pre>
+<p>
+          the initiating function returns <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">future</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span></code>. As above, an error is passed back
+          in the future as a <code class="computeroutput"><span class="identifier">system_error</span></code>
+          exception.
+        </p>
+<h6>
+<a name="asio.overview.composition.futures.h0"></a>
+          <span><a name="asio.overview.composition.futures.see_also"></a></span><a class="link" href="futures.html#asio.overview.composition.futures.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/use_future.html" title="use_future">use_future</a>, <a class="link" href="../../reference/use_future_t.html" title="use_future_t">use_future_t</a>,
+          <a class="link" href="../../examples/cpp11_examples.html#asio.examples.cpp11_examples.futures">Futures example (C++11)</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="spawn.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="cpp20_coroutines.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/composition/immediate_completion.html

@@ -0,0 +1,82 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Customising Immediate Completion</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../composition.html" title="Composition and Completion Tokens">
+<link rel="prev" href="type_erasure.html" title="Type Erasure, Separate Compilation and Virtual Functions">
+<link rel="next" href="../networking.html" title="Networking">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="type_erasure.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../networking.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.composition.immediate_completion"></a><a class="link" href="immediate_completion.html" title="Customising Immediate Completion">Customising
+        Immediate Completion</a>
+</h4></div></div></div>
+<p>
+          The <code class="computeroutput"><span class="identifier">associated_immediate_executor</span></code>
+          associator trait, along with the <code class="computeroutput"><span class="identifier">bind_immediate_executor</span></code>
+          function, provide the ability to customise the execution of a completion
+          handler when an asynchronous operation completes immediately.
+        </p>
+<p>
+          When a supported operation completes immediately (that is, within the initiating
+          function) the associated immmediate executor is obtained, and the completion
+          handler is delivered through that executor as if by using <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">dispatch</span></code> on that executor. By default,
+          the immediate executor delivers the completion handler as if using <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">post</span></code> via the operation's I/O executor.
+        </p>
+<p>
+          For example, to allow a recursive call to the completion handler of an
+          <code class="computeroutput"><span class="identifier">async_read_some</span></code> operation,
+          we may specify that immediate completion is delivered via a <code class="computeroutput"><span class="identifier">system_executor</span></code>:
+        </p>
+<pre class="programlisting"><span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">,</span>
+    <span class="identifier">bind_immediate_executor</span><span class="special">(</span>
+      <span class="identifier">system_executor</span><span class="special">(),</span>
+      <span class="special">[](</span><span class="identifier">error_code</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="comment">// ...</span>
+      <span class="special">}</span>
+    <span class="special">)</span>
+  <span class="special">);</span>
+</pre>
+<p>
+          Immediate execution is currently supported for asynchronous operations
+          on reactor-based sockets and descriptors, and for asynchronous operations
+          on channels.
+        </p>
+<p>
+          <span class="bold"><strong>Note:</strong></span> When enabling the immediate execution
+          of completion handlers, care must be taken to ensure that unbounded recursion
+          and stack overflow do not occur. Furthermore, use of immediate completion
+          may impact the fairness of completion handler scheduling, with a potential
+          for starvation for other pending work.
+        </p>
+<h6>
+<a name="asio.overview.composition.immediate_completion.h0"></a>
+          <span><a name="asio.overview.composition.immediate_completion.see_also"></a></span><a class="link" href="immediate_completion.html#asio.overview.composition.immediate_completion.see_also">See Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/associated_immediate_executor.html" title="associated_immediate_executor">associated_immediate_executor</a>,
+          <a class="link" href="../../reference/bind_immediate_executor.html" title="bind_immediate_executor">bind_immediate_executor</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="type_erasure.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../networking.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/composition/parallel_group.html

@@ -0,0 +1,104 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Co-ordinating Parallel Operations</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../composition.html" title="Composition and Completion Tokens">
+<link rel="prev" href="promises.html" title="Promises">
+<link rel="next" href="compose.html" title="Compositions as Asynchronous Operations">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="promises.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="compose.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.composition.parallel_group"></a><a class="link" href="parallel_group.html" title="Co-ordinating Parallel Operations">Co-ordinating
+        Parallel Operations</a>
+</h4></div></div></div>
+<div class="note"><table border="0" summary="Note">
+<tr>
+<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../note.png"></td>
+<th align="left">Note</th>
+</tr>
+<tr><td align="left" valign="top"><p>
+            This is an experimental feature.
+          </p></td></tr>
+</table></div>
+<p>
+          The <a class="link" href="../../reference/experimental__make_parallel_group.html" title="experimental::make_parallel_group"><code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">make_parallel_group</span></code></a> function may
+          be used to launch work that is performed in parallel, and wait for one
+          or all of the operations to complete. A <code class="computeroutput"><span class="identifier">parallel_group</span></code>
+          implements automatic cancellation of incomplete operations. For example:
+        </p>
+<pre class="programlisting"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">make_parallel_group</span><span class="special">(</span>
+    <span class="special">[&amp;](</span><span class="keyword">auto</span> <span class="identifier">token</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="keyword">return</span> <span class="identifier">stream</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">),</span> <span class="identifier">token</span><span class="special">);</span>
+    <span class="special">},</span>
+    <span class="special">[&amp;](</span><span class="keyword">auto</span> <span class="identifier">token</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="keyword">return</span> <span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">token</span><span class="special">);</span>
+    <span class="special">}</span>
+  <span class="special">).</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">experimental</span><span class="special">::</span><span class="identifier">wait_for_one</span><span class="special">(),</span>
+    <span class="special">[](</span>
+        <span class="identifier">std</span><span class="special">::</span><span class="identifier">array</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="number">2</span><span class="special">&gt;</span> <span class="identifier">completion_order</span><span class="special">,</span>
+        <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec1</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n1</span><span class="special">,</span>
+        <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec2</span>
+    <span class="special">)</span>
+    <span class="special">{</span>
+      <span class="comment">// ...</span>
+    <span class="special">}</span>
+  <span class="special">);</span>
+</pre>
+<p>
+          The conditions for completion of the group may be specified using one of
+          the four provided function objects <a class="link" href="../../reference/experimental__wait_for_all.html" title="experimental::wait_for_all"><code class="computeroutput"><span class="identifier">wait_for_all</span></code></a>, <a class="link" href="../../reference/experimental__wait_for_one.html" title="experimental::wait_for_one"><code class="computeroutput"><span class="identifier">wait_for_one</span></code></a>, <a class="link" href="../../reference/experimental__wait_for_one_success.html" title="experimental::wait_for_one_success"><code class="computeroutput"><span class="identifier">wait_for_one_success</span></code></a>, <a class="link" href="../../reference/experimental__wait_for_one_error.html" title="experimental::wait_for_one_error"><code class="computeroutput"><span class="identifier">wait_for_one_error</span></code></a>, or with a
+          custom function.
+        </p>
+<p>
+          The <code class="computeroutput"><span class="identifier">parallel_group</span></code> facility
+          can also be combined with <a class="link" href="../../reference/deferred.html" title="deferred"><code class="computeroutput"><span class="identifier">deferred</span></code></a> as follows:
+        </p>
+<pre class="programlisting"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">make_parallel_group</span><span class="special">(</span>
+    <span class="identifier">stream</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">),</span> <span class="identifier">deferred</span><span class="special">),</span>
+    <span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">deferred</span><span class="special">)</span>
+  <span class="special">).</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="comment">// ...</span>
+  <span class="special">);</span>
+</pre>
+<p>
+          Note: for maximum flexibility, <code class="computeroutput"><span class="identifier">parallel_group</span></code>
+          does not propagate the executor automatically to the operations within
+          the group.
+        </p>
+<h6>
+<a name="asio.overview.composition.parallel_group.h0"></a>
+          <span><a name="asio.overview.composition.parallel_group.see_also"></a></span><a class="link" href="parallel_group.html#asio.overview.composition.parallel_group.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/experimental__make_parallel_group.html" title="experimental::make_parallel_group">experimental::make_parallel_group</a>,
+          <a class="link" href="../../reference/experimental__parallel_group.html" title="experimental::parallel_group">experimental::parallel_group</a>,
+          <a class="link" href="../../examples/cpp11_examples.html#asio.examples.cpp11_examples.parallel_groups">Parallel Groups
+          examples (C++11)</a>, <a class="link" href="../../examples/cpp14_examples.html#asio.examples.cpp14_examples.parallel_groups">Parallel
+          Groups examples (C++14)</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="promises.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="compose.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/composition/promises.html

@@ -0,0 +1,131 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Promises</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../composition.html" title="Composition and Completion Tokens">
+<link rel="prev" href="deferred.html" title="Deferred Operations">
+<link rel="next" href="parallel_group.html" title="Co-ordinating Parallel Operations">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="deferred.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="parallel_group.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.composition.promises"></a><a class="link" href="promises.html" title="Promises">Promises</a>
+</h4></div></div></div>
+<div class="note"><table border="0" summary="Note">
+<tr>
+<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../note.png"></td>
+<th align="left">Note</th>
+</tr>
+<tr><td align="left" valign="top"><p>
+            This is an experimental feature.
+          </p></td></tr>
+</table></div>
+<p>
+          The <a class="link" href="../../reference/experimental__promise.html" title="experimental::promise"><code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">promise</span></code></a> type and <a class="link" href="../../reference/experimental__use_promise.html" title="experimental::use_promise"><code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">use_promise</span></code></a> completion token allow
+          eager execution and synchronisation of asynchronous operations. For example:
+        </p>
+<pre class="programlisting"><span class="keyword">auto</span> <span class="identifier">promise</span> <span class="special">=</span> <span class="identifier">async_read</span><span class="special">(</span>
+    <span class="identifier">stream</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">),</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">use_promise</span><span class="special">);</span>
+
+<span class="special">...</span> <span class="keyword">do</span> <span class="identifier">other</span> <span class="identifier">stuff</span> <span class="keyword">while</span> <span class="identifier">the</span> <span class="identifier">read</span> <span class="identifier">is</span> <span class="identifier">going</span> <span class="identifier">on</span> <span class="special">...</span>
+
+<span class="identifier">promise</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span> <span class="comment">// completion the operation</span>
+    <span class="special">[](</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">bytes_read</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="special">...</span>
+    <span class="special">});</span>
+</pre>
+<p>
+          Promises can be safely disregarded if the result is no longer required.
+          Different operations can be combined to either wait for all to complete
+          or for one to complete (and cancel the rest). For example, to wait for
+          one to complete:
+        </p>
+<pre class="programlisting"><span class="keyword">auto</span> <span class="identifier">timeout_promise</span> <span class="special">=</span>
+  <span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">use_promise</span><span class="special">);</span>
+
+<span class="keyword">auto</span> <span class="identifier">read_promise</span> <span class="special">=</span> <span class="identifier">async_read</span><span class="special">(</span>
+    <span class="identifier">stream</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">),</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">use_promise</span><span class="special">);</span>
+
+<span class="keyword">auto</span> <span class="identifier">promise</span> <span class="special">=</span>
+  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">make_parallel_group</span><span class="special">(</span>
+    <span class="identifier">timeout_promise</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">deferred</span><span class="special">),</span>
+    <span class="identifier">read_promise</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">deferred</span><span class="special">)</span>
+  <span class="special">).</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">wait_for_one</span><span class="special">(),</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">use_promise</span><span class="special">);</span>
+
+<span class="identifier">promise</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="special">[](</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">array</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="number">2</span><span class="special">&gt;</span> <span class="identifier">order</span><span class="special">,</span>
+       <span class="identifier">error_code</span> <span class="identifier">timer_ec</span><span class="special">,</span>
+       <span class="identifier">error_code</span> <span class="identifier">read_ec</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">read_size</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="keyword">if</span> <span class="special">(</span><span class="identifier">order</span><span class="special">[</span><span class="number">0</span><span class="special">]</span> <span class="special">==</span> <span class="number">0</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="comment">// timed out</span>
+      <span class="special">}</span>
+      <span class="keyword">else</span>
+      <span class="special">{</span>
+        <span class="comment">// completed in time</span>
+      <span class="special">}</span>
+    <span class="special">});</span>
+</pre>
+<p>
+          or to wait for all to complete:
+        </p>
+<pre class="programlisting"><span class="keyword">auto</span> <span class="identifier">write_promise</span> <span class="special">=</span> <span class="identifier">async_write</span><span class="special">(</span>
+    <span class="identifier">stream</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">my_write_buffer</span><span class="special">),</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">use_promise</span><span class="special">);</span>
+
+<span class="keyword">auto</span> <span class="identifier">read_promise</span> <span class="special">=</span> <span class="identifier">async_read</span><span class="special">(</span>
+    <span class="identifier">stream</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">),</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">use_promise</span><span class="special">);</span>
+
+<span class="keyword">auto</span> <span class="identifier">promise</span> <span class="special">=</span>
+  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">make_parallel_group</span><span class="special">(</span>
+    <span class="identifier">timeout_promise</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">deferred</span><span class="special">),</span>
+    <span class="identifier">read_promise</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">deferred</span><span class="special">)</span>
+  <span class="special">).</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">wait_for_all</span><span class="special">(),</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">use_promise</span><span class="special">);</span>
+
+<span class="identifier">promise</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="special">[](</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">array</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="number">2</span><span class="special">&gt;</span> <span class="identifier">order</span><span class="special">,</span>
+       <span class="identifier">error_code</span> <span class="identifier">timer_ec</span><span class="special">,</span>
+       <span class="identifier">error_code</span> <span class="identifier">read_ec</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">read_size</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="comment">// ...</span>
+    <span class="special">});</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.promises.h0"></a>
+          <span><a name="asio.overview.composition.promises.see_also"></a></span><a class="link" href="promises.html#asio.overview.composition.promises.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/experimental__promise.html" title="experimental::promise">promise</a>, <a class="link" href="../../reference/experimental__use_promise.html" title="experimental::use_promise">use_promise</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="deferred.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="parallel_group.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/composition/spawn.html

@@ -0,0 +1,144 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Stackful Coroutines</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../composition.html" title="Composition and Completion Tokens">
+<link rel="prev" href="coroutine.html" title="Stackless Coroutines">
+<link rel="next" href="futures.html" title="Futures">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="coroutine.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="futures.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.composition.spawn"></a><a class="link" href="spawn.html" title="Stackful Coroutines">Stackful Coroutines</a>
+</h4></div></div></div>
+<p>
+          The <a class="link" href="../../reference/spawn.html" title="spawn"><code class="computeroutput"><span class="identifier">spawn</span><span class="special">()</span></code></a> function is a high-level wrapper
+          for running stackful coroutines. It is based on the Boost.Coroutine library.
+          The <code class="computeroutput"><span class="identifier">spawn</span><span class="special">()</span></code>
+          function enables programs to implement asynchronous logic in a synchronous
+          manner, as shown in the following example:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">spawn</span><span class="special">(</span><span class="identifier">my_strand</span><span class="special">,</span> <span class="identifier">do_echo</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">detached</span><span class="special">);</span>
+
+<span class="comment">// ...</span>
+
+<span class="keyword">void</span> <span class="identifier">do_echo</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">yield_context</span> <span class="identifier">yield</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">try</span>
+  <span class="special">{</span>
+    <span class="keyword">char</span> <span class="identifier">data</span><span class="special">[</span><span class="number">128</span><span class="special">];</span>
+    <span class="keyword">for</span> <span class="special">(;;)</span>
+    <span class="special">{</span>
+      <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">length</span> <span class="special">=</span>
+        <span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span>
+          <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">),</span> <span class="identifier">yield</span><span class="special">);</span>
+
+      <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_write</span><span class="special">(</span><span class="identifier">my_socket</span><span class="special">,</span>
+          <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">,</span> <span class="identifier">length</span><span class="special">),</span> <span class="identifier">yield</span><span class="special">);</span>
+    <span class="special">}</span>
+  <span class="special">}</span>
+  <span class="keyword">catch</span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception</span><span class="special">&amp;</span> <span class="identifier">e</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="comment">// ...</span>
+  <span class="special">}</span>
+<span class="special">}</span>
+</pre>
+<p>
+          The first argument to <code class="computeroutput"><span class="identifier">spawn</span><span class="special">()</span></code> may be an executor or execution context.
+          This argument determines the context in which the coroutine is permitted
+          to execute. For example, a server's per-client object may consist of multiple
+          coroutines; they should all run on the same <code class="computeroutput"><span class="identifier">strand</span></code>
+          so that no explicit synchronisation is required.
+        </p>
+<p>
+          The second argument is a function object with signature:
+        </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">coroutine</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">yield_context</span> <span class="identifier">yield</span><span class="special">);</span>
+</pre>
+<p>
+          that specifies the code to be run as part of the coroutine. The parameter
+          <code class="computeroutput"><span class="identifier">yield</span></code> may be passed to
+          an asynchronous operation in place of the completion handler, as in:
+        </p>
+<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">length</span> <span class="special">=</span>
+  <span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">),</span> <span class="identifier">yield</span><span class="special">);</span>
+</pre>
+<p>
+          This starts the asynchronous operation and suspends the coroutine. The
+          coroutine will be resumed automatically when the asynchronous operation
+          completes.
+        </p>
+<p>
+          Where an asynchronous operation's handler signature has the form:
+        </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">,</span> <span class="identifier">result_type</span> <span class="identifier">result</span><span class="special">);</span>
+</pre>
+<p>
+          the initiating function returns the result_type. In the <code class="computeroutput"><span class="identifier">async_read_some</span></code>
+          example above, this is <code class="computeroutput"><span class="identifier">size_t</span></code>.
+          If the asynchronous operation fails, the <code class="computeroutput"><span class="identifier">error_code</span></code>
+          is converted into a <code class="computeroutput"><span class="identifier">system_error</span></code>
+          exception and thrown.
+        </p>
+<p>
+          Where a handler signature has the form:
+        </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">);</span>
+</pre>
+<p>
+          the initiating function returns <code class="computeroutput"><span class="keyword">void</span></code>.
+          As above, an error is passed back to the coroutine as a <code class="computeroutput"><span class="identifier">system_error</span></code>
+          exception.
+        </p>
+<p>
+          To collect the <code class="computeroutput"><span class="identifier">error_code</span></code>
+          from an operation, rather than have it throw an exception, associate the
+          output variable with the <code class="computeroutput"><span class="identifier">yield_context</span></code>
+          as follows:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">;</span>
+<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">length</span> <span class="special">=</span>
+  <span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">),</span> <span class="identifier">yield</span><span class="special">[</span><span class="identifier">ec</span><span class="special">]);</span>
+</pre>
+<p>
+          <span class="bold"><strong>Note:</strong></span> if <code class="computeroutput"><span class="identifier">spawn</span><span class="special">()</span></code> is used with a specified executor of
+          type <code class="computeroutput"><span class="identifier">Executor</span></code>, the function
+          object signature is actually:
+        </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">coroutine</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">basic_yield_context</span><span class="special">&lt;</span><span class="identifier">Executor</span><span class="special">&gt;</span> <span class="identifier">yield</span><span class="special">);</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.spawn.h0"></a>
+          <span><a name="asio.overview.composition.spawn.see_also"></a></span><a class="link" href="spawn.html#asio.overview.composition.spawn.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/spawn.html" title="spawn">spawn</a>, <a class="link" href="../../reference/yield_context.html" title="yield_context">yield_context</a>,
+          <a class="link" href="../../reference/basic_yield_context.html" title="basic_yield_context">basic_yield_context</a>,
+          <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.spawn">Spawn example (C++03)</a>,
+          <a class="link" href="../../examples/cpp11_examples.html#asio.examples.cpp11_examples.spawn">Spawn example (C++11)</a>,
+          <a class="link" href="coroutine.html" title="Stackless Coroutines">Stackless Coroutines</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="coroutine.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="futures.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/composition/token_adapters.html

@@ -0,0 +1,316 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Completion Token Adapters</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../composition.html" title="Composition and Completion Tokens">
+<link rel="prev" href="compose.html" title="Compositions as Asynchronous Operations">
+<link rel="next" href="type_erasure.html" title="Type Erasure, Separate Compilation and Virtual Functions">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="compose.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="type_erasure.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.composition.token_adapters"></a><a class="link" href="token_adapters.html" title="Completion Token Adapters">Completion
+        Token Adapters</a>
+</h4></div></div></div>
+<p>
+          A <span class="emphasis"><em>completion token adapter</em></span> is a utility that can be
+          generically applied to a <a class="link" href="../model/completion_tokens.html" title="Completion Tokens">completion
+          token</a>, to produce a new completion token with modified behaviour.
+          Common uses of completion token adapters include:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              Automatically wrapping the completion handler to add <a class="link" href="../model/associators.html" title="Associated Characteristics and Associators">associated
+              characteristics</a>.
+            </li>
+<li class="listitem">
+              Transforming the completion signature and arguments passed to the completion
+              handler.
+            </li>
+</ul></div>
+<p>
+          Asio includes a number of completion token adapters as described below.
+        </p>
+<h6>
+<a name="asio.overview.composition.token_adapters.h0"></a>
+          <span><a name="asio.overview.composition.token_adapters.bind_executor__bind_allocator__and_bind_cancellation_slot"></a></span><a class="link" href="token_adapters.html#asio.overview.composition.token_adapters.bind_executor__bind_allocator__and_bind_cancellation_slot">bind_executor,
+          bind_allocator, and bind_cancellation_slot</a>
+        </h6>
+<p>
+          The <a class="link" href="../../reference/bind_executor.html" title="bind_executor"><code class="computeroutput"><span class="identifier">bind_executor</span></code></a>
+          function adapts a completion token to imbue the completion handler with
+          an <a class="link" href="../model/executors.html" title="Executors">associated executor</a>.
+        </p>
+<p>
+          This example shows the <code class="computeroutput"><span class="identifier">bind_executor</span></code>
+          adapter applied to a lambda, to specify that the handler should execute
+          in the specified strand. The arguments to the completion handler are passed
+          through as-is.
+        </p>
+<pre class="programlisting"><span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">,</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">bind_executor</span><span class="special">(</span><span class="identifier">my_strand</span><span class="special">,</span>
+      <span class="special">[](</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">error</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">bytes_transferred</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="comment">// ...</span>
+      <span class="special">}));</span>
+</pre>
+<p>
+          When applied to completion tokens that cause the initiating function to
+          produce a result, such as <a class="link" href="../../reference/use_awaitable.html" title="use_awaitable"><code class="computeroutput"><span class="identifier">use_awaitable</span></code></a>, the result is returned
+          unmodified.
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">my_coroutine</span><span class="special">()</span>
+<span class="special">{</span>
+  <span class="comment">// ...</span>
+  <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">bytes_transferred</span> <span class="special">=</span>
+    <span class="identifier">co_await</span> <span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">,</span>
+      <span class="identifier">asio</span><span class="special">::</span><span class="identifier">bind_executor</span><span class="special">(</span><span class="identifier">my_strand</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable</span><span class="special">));</span>
+  <span class="comment">// ...</span>
+<span class="special">}</span>
+</pre>
+<p>
+          The <a class="link" href="../../reference/bind_allocator.html" title="bind_allocator"><code class="computeroutput"><span class="identifier">bind_allocator</span></code></a>
+          and <a class="link" href="../../reference/bind_cancellation_slot.html" title="bind_cancellation_slot"><code class="computeroutput"><span class="identifier">bind_cancellation_slot</span></code></a> adapters
+          work similarly, to imbue the completion handler with an <a class="link" href="../model/allocators.html" title="Allocators">associated
+          allocator</a> or <a class="link" href="../model/cancellation.html" title="Cancellation">associated
+          cancellation slot</a> respectively.
+        </p>
+<h6>
+<a name="asio.overview.composition.token_adapters.h1"></a>
+          <span><a name="asio.overview.composition.token_adapters.redirect_error"></a></span><a class="link" href="token_adapters.html#asio.overview.composition.token_adapters.redirect_error">redirect_error</a>
+        </h6>
+<p>
+          The <a class="link" href="../../reference/redirect_error.html" title="redirect_error"><code class="computeroutput"><span class="identifier">redirect_error</span></code></a>
+          function adapts a completion token to capture the <code class="computeroutput"><span class="identifier">error_code</span></code>
+          produced by an operation into a specified variable. In doing so, it modifies
+          the completion signature to remove the initial <code class="computeroutput"><span class="identifier">error_code</span></code>
+          parameter.
+        </p>
+<p>
+          This example shows the <code class="computeroutput"><span class="identifier">redirect_error</span></code>
+          adapter applied to a lambda, to specify that the error should be captured
+          into <code class="computeroutput"><span class="identifier">my_error</span></code>. The <code class="computeroutput"><span class="identifier">error_code</span></code> is no longer passed to the
+          completion handler, but the remaining arguments are passed through as-is.
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">my_error</span><span class="special">;</span> <span class="comment">// N.B. must be valid until operation completes</span>
+<span class="comment">// ...</span>
+<span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">,</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">redirect_error</span><span class="special">(</span>
+      <span class="special">[](</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">bytes_transferred</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="comment">// ...</span>
+      <span class="special">},</span> <span class="identifier">my_error</span><span class="special">));</span>
+</pre>
+<p>
+          When applied to completion tokens that cause the initiating function to
+          produce a result, such as <a class="link" href="../../reference/use_awaitable.html" title="use_awaitable"><code class="computeroutput"><span class="identifier">use_awaitable</span></code></a>, the result is returned
+          unmodified. However, if the operation fails, the <code class="computeroutput"><span class="identifier">co_await</span></code>
+          expression will no longer throw an exception on resumption.
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">my_coroutine</span><span class="special">()</span>
+<span class="special">{</span>
+  <span class="comment">// ...</span>
+  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">my_error</span><span class="special">;</span>
+  <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">bytes_transferred</span> <span class="special">=</span>
+    <span class="identifier">co_await</span> <span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">,</span>
+      <span class="identifier">asio</span><span class="special">::</span><span class="identifier">redirect_error</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable</span><span class="special">,</span> <span class="identifier">my_error</span><span class="special">));</span>
+  <span class="comment">// ...</span>
+<span class="special">}</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.token_adapters.h2"></a>
+          <span><a name="asio.overview.composition.token_adapters.as_tuple"></a></span><a class="link" href="token_adapters.html#asio.overview.composition.token_adapters.as_tuple">as_tuple</a>
+        </h6>
+<p>
+          The <a class="link" href="../../reference/as_tuple.html" title="as_tuple"><code class="computeroutput"><span class="identifier">as_tuple</span></code></a>
+          adapter can be used to specify that the completion handler arguments should
+          be combined into a single tuple argument.
+        </p>
+<p>
+          For example, the <code class="computeroutput"><span class="identifier">as_tuple</span></code>
+          adapter may be used in conjunction with <a class="link" href="../../reference/use_awaitable.html" title="use_awaitable"><code class="computeroutput"><span class="identifier">use_awaitable</span></code></a> and structured bindings
+          as follows:
+        </p>
+<pre class="programlisting"><span class="keyword">auto</span> <span class="special">[</span><span class="identifier">e</span><span class="special">,</span> <span class="identifier">n</span><span class="special">]</span> <span class="special">=</span>
+  <span class="identifier">co_await</span> <span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">,</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">as_tuple</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable</span><span class="special">));</span>
+</pre>
+<p>
+          This adapter may also be used as a default completion token:
+        </p>
+<pre class="programlisting"><span class="keyword">using</span> <span class="identifier">default_token</span> <span class="special">=</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">as_tuple_t</span><span class="special">&lt;</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_awaitable_t</span><span class="special">&lt;&gt;&gt;;</span>
+<span class="keyword">using</span> <span class="identifier">tcp_socket</span> <span class="special">=</span> <span class="identifier">default_token</span><span class="special">::</span><span class="identifier">as_default_on_t</span><span class="special">&lt;</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&gt;;</span>
+<span class="comment">// ...</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">do_read</span><span class="special">(</span><span class="identifier">tcp_socket</span> <span class="identifier">my_socket</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="comment">// ...</span>
+  <span class="keyword">auto</span> <span class="special">[</span><span class="identifier">e</span><span class="special">,</span> <span class="identifier">n</span><span class="special">]</span> <span class="special">=</span> <span class="identifier">co_await</span> <span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">);</span>
+  <span class="comment">// ...</span>
+<span class="special">}</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.token_adapters.h3"></a>
+          <span><a name="asio.overview.composition.token_adapters.as_single"></a></span><a class="link" href="token_adapters.html#asio.overview.composition.token_adapters.as_single">as_single</a>
+        </h6>
+<div class="note"><table border="0" summary="Note">
+<tr>
+<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../note.png"></td>
+<th align="left">Note</th>
+</tr>
+<tr><td align="left" valign="top"><p>
+            This is an experimental feature.
+          </p></td></tr>
+</table></div>
+<p>
+          The <a class="link" href="../../reference/experimental__as_single.html" title="experimental::as_single"><code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">as_single</span></code></a> adapter can be used
+          to specify that the completion handler arguments should be combined into
+          a single argument. For completion signatures with a single parameter, the
+          argument is passed through as-is. For signatures with two or more parameters,
+          the arguments are combined into a tuple.
+        </p>
+<p>
+          For example, when applied to a timer wait operation, the single <code class="computeroutput"><span class="identifier">error_code</span></code> argument is passed directly
+          to the completion handler:
+        </p>
+<pre class="programlisting"><span class="identifier">my_timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">as_single</span><span class="special">(</span>
+      <span class="special">[](</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">error</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="comment">// ...</span>
+      <span class="special">}));</span>
+</pre>
+<p>
+          When applied to a socket read operation, where the completion signature
+          specifies two parameters, the handler is passed the result as a tuple:
+        </p>
+<pre class="programlisting"><span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">,</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">as_single</span><span class="special">,</span>
+      <span class="special">[](</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">tuple</span><span class="special">&lt;</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">&gt;</span> <span class="identifier">result</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="comment">// ...</span>
+      <span class="special">}));</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.token_adapters.h4"></a>
+          <span><a name="asio.overview.composition.token_adapters.append"></a></span><a class="link" href="token_adapters.html#asio.overview.composition.token_adapters.append">append</a>
+        </h6>
+<p>
+          The <a class="link" href="../../reference/append.html" title="append"><code class="computeroutput"><span class="identifier">append</span></code></a>
+          completion token adapter can be used to pass additional completion handler
+          arguments at the end of the completion signature.
+        </p>
+<p>
+          For example:
+        </p>
+<pre class="programlisting"><span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">append</span><span class="special">(</span>
+      <span class="special">[](</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">,</span> <span class="keyword">int</span> <span class="identifier">i</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="comment">// ...</span>
+      <span class="special">},</span>
+      <span class="number">42</span>
+    <span class="special">)</span>
+  <span class="special">);</span>
+
+<span class="identifier">std</span><span class="special">::</span><span class="identifier">future</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">append</span><span class="special">(</span>
+      <span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_future</span><span class="special">,</span>
+      <span class="number">42</span>
+    <span class="special">)</span>
+  <span class="special">);</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.token_adapters.h5"></a>
+          <span><a name="asio.overview.composition.token_adapters.prepend"></a></span><a class="link" href="token_adapters.html#asio.overview.composition.token_adapters.prepend">prepend</a>
+        </h6>
+<p>
+          The <a class="link" href="../../reference/prepend.html" title="prepend"><code class="computeroutput"><span class="identifier">prepend</span></code></a>
+          completion token adapter can be used to pass additional completion handler
+          arguments before the existing completion handler arguments.
+        </p>
+<p>
+          For example:
+        </p>
+<pre class="programlisting"><span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">prepend</span><span class="special">(</span>
+      <span class="special">[](</span><span class="keyword">int</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="comment">// ...</span>
+      <span class="special">},</span>
+      <span class="number">42</span>
+    <span class="special">)</span>
+  <span class="special">);</span>
+
+<span class="identifier">std</span><span class="special">::</span><span class="identifier">future</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">tuple</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&gt;&gt;</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">timer</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">prepend</span><span class="special">(</span>
+      <span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_future</span><span class="special">,</span>
+      <span class="number">42</span>
+    <span class="special">)</span>
+  <span class="special">);</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.token_adapters.h6"></a>
+          <span><a name="asio.overview.composition.token_adapters.consign"></a></span><a class="link" href="token_adapters.html#asio.overview.composition.token_adapters.consign">consign</a>
+        </h6>
+<p>
+          The <a class="link" href="../../reference/consign.html" title="consign"><code class="computeroutput"><span class="identifier">consign</span></code></a>
+          completion token adapter can be used to attach additional values to a completion
+          handler. This is typically used to keep at least one copy of an object,
+          such as a smart pointer, alive until the completion handler is called.
+        </p>
+<p>
+          For example:
+        </p>
+<pre class="programlisting"><span class="keyword">auto</span> <span class="identifier">timer1</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">make_shared</span><span class="special">&lt;</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">steady_timer</span><span class="special">&gt;(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">timer1</span><span class="special">-&gt;</span><span class="identifier">expires_after</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">1</span><span class="special">));</span>
+<span class="identifier">timer1</span><span class="special">-&gt;</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">consign</span><span class="special">(</span>
+      <span class="special">[](</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="comment">// ...</span>
+      <span class="special">},</span>
+      <span class="identifier">timer1</span>
+    <span class="special">)</span>
+  <span class="special">);</span>
+
+<span class="keyword">auto</span> <span class="identifier">timer2</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">make_shared</span><span class="special">&lt;</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">steady_timer</span><span class="special">&gt;(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">timer2</span><span class="special">-&gt;</span><span class="identifier">expires_after</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">30</span><span class="special">));</span>
+<span class="identifier">std</span><span class="special">::</span><span class="identifier">future</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">f</span> <span class="special">=</span>
+  <span class="identifier">timer2</span><span class="special">-&gt;</span><span class="identifier">async_wait</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">consign</span><span class="special">(</span>
+      <span class="identifier">asio</span><span class="special">::</span><span class="identifier">use_future</span><span class="special">,</span>
+      <span class="identifier">timer2</span>
+    <span class="special">)</span>
+  <span class="special">);</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.token_adapters.h7"></a>
+          <span><a name="asio.overview.composition.token_adapters.see_also"></a></span><a class="link" href="token_adapters.html#asio.overview.composition.token_adapters.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/bind_executor.html" title="bind_executor">bind_executor</a>, <a class="link" href="../../reference/bind_allocator.html" title="bind_allocator">bind_allocator</a>, <a class="link" href="../../reference/bind_cancellation_slot.html" title="bind_cancellation_slot">bind_cancellation_slot</a>,
+          <a class="link" href="../../reference/redirect_error.html" title="redirect_error">redirect_error</a>, <a class="link" href="../../reference/as_tuple.html" title="as_tuple">as_tuple</a>, <a class="link" href="../../reference/experimental__as_single.html" title="experimental::as_single">experimental::as_single</a>,
+          <a class="link" href="../../reference/append.html" title="append">append</a>, <a class="link" href="../../reference/prepend.html" title="prepend">prepend</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="compose.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="type_erasure.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/composition/type_erasure.html

@@ -0,0 +1,126 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Type Erasure, Separate Compilation and Virtual Functions</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../composition.html" title="Composition and Completion Tokens">
+<link rel="prev" href="token_adapters.html" title="Completion Token Adapters">
+<link rel="next" href="immediate_completion.html" title="Customising Immediate Completion">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="token_adapters.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="immediate_completion.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.composition.type_erasure"></a><a class="link" href="type_erasure.html" title="Type Erasure, Separate Compilation and Virtual Functions">Type Erasure,
+        Separate Compilation and Virtual Functions</a>
+</h4></div></div></div>
+<p>
+          The <code class="computeroutput"><span class="identifier">any_completion_handler</span><span class="special">&lt;&gt;</span></code> class template can be used to type-erase
+          completion handlers. This template stores a completion handler in a runtime-polymorphic
+          wrapper, and forwards the function call operator, associated executor,
+          associated allocator, and associated cancellation slot to the target handler.
+        </p>
+<p>
+          One use case is to enable separate compilation of asynchronous operation
+          implementations. For example, we can declare our implementation function
+          in a header file, and provide a thin asynchronous operation wrapper:
+        </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">async_sleep_impl</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">any_completion_handler</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">)&gt;</span> <span class="identifier">handler</span><span class="special">,</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">any_io_executor</span> <span class="identifier">ex</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">nanoseconds</span> <span class="identifier">duration</span><span class="special">);</span>
+
+<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CompletionToken</span><span class="special">&gt;</span>
+<span class="keyword">inline</span> <span class="keyword">auto</span> <span class="identifier">async_sleep</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">any_io_executor</span> <span class="identifier">ex</span><span class="special">,</span>
+    <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">nanoseconds</span> <span class="identifier">duration</span><span class="special">,</span> <span class="identifier">CompletionToken</span><span class="special">&amp;&amp;</span> <span class="identifier">token</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">return</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_initiate</span><span class="special">&lt;</span>
+    <span class="identifier">CompletionToken</span><span class="special">,</span> <span class="keyword">void</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">)&gt;(</span>
+      <span class="identifier">async_sleep_impl</span><span class="special">,</span> <span class="identifier">token</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">ex</span><span class="special">),</span> <span class="identifier">duration</span><span class="special">);</span>
+<span class="special">}</span>
+</pre>
+<p>
+          By wrapping a call to <code class="computeroutput"><span class="identifier">async_initiate</span></code>,
+          the <code class="computeroutput"><span class="identifier">async_sleep</span></code> template
+          function adds full support for completion tokens. The definition of <code class="computeroutput"><span class="identifier">async_sleep_impl</span></code> is then put into a separately
+          compiled source file:
+        </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">async_sleep_impl</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">any_completion_handler</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">)&gt;</span> <span class="identifier">handler</span><span class="special">,</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">any_io_executor</span> <span class="identifier">ex</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">nanoseconds</span> <span class="identifier">duration</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">auto</span> <span class="identifier">timer</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">make_shared</span><span class="special">&lt;</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">steady_timer</span><span class="special">&gt;(</span><span class="identifier">ex</span><span class="special">,</span> <span class="identifier">duration</span><span class="special">);</span>
+  <span class="identifier">timer</span><span class="special">-&gt;</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">consign</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">handler</span><span class="special">),</span> <span class="identifier">timer</span><span class="special">));</span>
+<span class="special">}</span>
+</pre>
+<p>
+          Another use for <code class="computeroutput"><span class="identifier">any_completion_handler</span><span class="special">&lt;&gt;</span></code> is to vary the implementation behind
+          an asynchronous operation at runtime, by using virtual functions:
+        </p>
+<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">line_reader</span>
+<span class="special">{</span>
+<span class="keyword">public</span><span class="special">:</span>
+  <span class="comment">// ...</span>
+
+  <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CompletionToken</span><span class="special">&gt;</span>
+  <span class="keyword">auto</span> <span class="identifier">async_read_line</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">prompt</span><span class="special">,</span> <span class="identifier">CompletionToken</span><span class="special">&amp;&amp;</span> <span class="identifier">token</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="keyword">return</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_initiate</span><span class="special">&lt;</span>
+      <span class="identifier">CompletionToken</span><span class="special">,</span> <span class="keyword">void</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;(</span>
+        <span class="special">[](</span><span class="keyword">auto</span> <span class="identifier">handler</span><span class="special">,</span> <span class="identifier">line_reader</span><span class="special">*</span> <span class="identifier">self</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">prompt</span><span class="special">)</span>
+        <span class="special">{</span>
+          <span class="identifier">self</span><span class="special">-&gt;</span><span class="identifier">async_read_line_impl</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">prompt</span><span class="special">),</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">handler</span><span class="special">));</span>
+        <span class="special">},</span> <span class="identifier">token</span><span class="special">,</span> <span class="keyword">this</span><span class="special">,</span> <span class="identifier">prompt</span><span class="special">);</span>
+  <span class="special">}</span>
+
+<span class="keyword">private</span><span class="special">:</span>
+  <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">async_read_line_impl</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">prompt</span><span class="special">,</span>
+      <span class="identifier">asio</span><span class="special">::</span><span class="identifier">any_completion_handler</span><span class="special">&lt;</span>
+        <span class="keyword">void</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;</span> <span class="identifier">handler</span><span class="special">)</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
+<span class="special">};</span>
+</pre>
+<p>
+          A derived class provides the implementation of the operation:
+        </p>
+<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">stdin_line_reader</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">line_reader</span>
+<span class="special">{</span>
+<span class="keyword">private</span><span class="special">:</span>
+  <span class="comment">// ...</span>
+
+  <span class="keyword">void</span> <span class="identifier">async_read_line_impl</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">prompt</span><span class="special">,</span>
+      <span class="identifier">asio</span><span class="special">::</span><span class="identifier">any_completion_handler</span><span class="special">&lt;</span>
+        <span class="keyword">void</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">)&gt;</span> <span class="identifier">handler</span><span class="special">)</span> <span class="identifier">override</span>
+  <span class="special">{</span>
+    <span class="comment">// ...</span>
+  <span class="special">}</span>
+<span class="special">};</span>
+</pre>
+<h6>
+<a name="asio.overview.composition.type_erasure.h0"></a>
+          <span><a name="asio.overview.composition.type_erasure.see_also"></a></span><a class="link" href="type_erasure.html#asio.overview.composition.type_erasure.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/any_completion_handler.html" title="any_completion_handler">any_completion_handler</a>,
+          <a class="link" href="../../examples/cpp11_examples.html#asio.examples.cpp11_examples.type_erasure">type erasure
+          examples (C++11)</a>, <a class="link" href="../../examples/cpp20_examples.html#asio.examples.cpp20_examples.type_erasure">type
+          erasure examples (C++20)</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="token_adapters.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../composition.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="immediate_completion.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/core.html

@@ -0,0 +1,72 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Core Concepts and Functionality</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="model/higher_levels.html" title="Higher Level Abstractions">
+<link rel="next" href="core/async.html" title="The Proactor Design Pattern: Concurrency Without Threads">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="model/higher_levels.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="core/async.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.core"></a><a class="link" href="core.html" title="Core Concepts and Functionality">Core Concepts and Functionality</a>
+</h3></div></div></div>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a class="link" href="core/async.html" title="The Proactor Design Pattern: Concurrency Without Threads">The Proactor Design Pattern:
+            Concurrency Without Threads</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="core/threads.html" title="Threads and Asio">Threads and Asio</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="core/strands.html" title="Strands: Use Threads Without Explicit Locking">Strands: Use Threads Without
+            Explicit Locking</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="core/buffers.html" title="Buffers">Buffers</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="core/streams.html" title="Streams, Short Reads and Short Writes">Streams, Short Reads and Short
+            Writes</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="core/reactor.html" title="Reactor-Style Operations">Reactor-Style Operations</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="core/line_based.html" title="Line-Based Operations">Line-Based Operations</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="core/allocation.html" title="Custom Memory Allocation">Custom Memory Allocation</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="core/cancellation.html" title="Per-Operation Cancellation">Per-Operation Cancellation</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="core/handler_tracking.html" title="Handler Tracking">Handler Tracking</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="core/concurrency_hint.html" title="Concurrency Hints">Concurrency Hints</a>
+          </li>
+</ul></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="model/higher_levels.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="core/async.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/core/allocation.html

@@ -0,0 +1,139 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Custom Memory Allocation</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../core.html" title="Core Concepts and Functionality">
+<link rel="prev" href="line_based.html" title="Line-Based Operations">
+<link rel="next" href="cancellation.html" title="Per-Operation Cancellation">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="line_based.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="cancellation.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.core.allocation"></a><a class="link" href="allocation.html" title="Custom Memory Allocation">Custom Memory Allocation</a>
+</h4></div></div></div>
+<p>
+          Many asynchronous operations need to allocate an object to store state
+          associated with the operation. For example, a Win32 implementation needs
+          <code class="computeroutput"><span class="identifier">OVERLAPPED</span></code>-derived objects
+          to pass to Win32 API functions.
+        </p>
+<p>
+          Furthermore, programs typically contain easily identifiable chains of asynchronous
+          operations. A half duplex protocol implementation (e.g. an HTTP server)
+          would have a single chain of operations per client (receives followed by
+          sends). A full duplex protocol implementation would have two chains executing
+          in parallel. Programs should be able to leverage this knowledge to reuse
+          memory for all asynchronous operations in a chain.
+        </p>
+<p>
+          Given a copy of a user-defined <code class="computeroutput"><span class="identifier">Handler</span></code>
+          object <code class="computeroutput"><span class="identifier">h</span></code>, if the implementation
+          needs to allocate memory associated with that handler it will obtain an
+          allocator using the <code class="computeroutput"><span class="identifier">get_associated_allocator</span></code>
+          function. For example:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">associated_allocator_t</span><span class="special">&lt;</span><span class="identifier">Handler</span><span class="special">&gt;</span> <span class="identifier">a</span> <span class="special">=</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">get_associated_allocator</span><span class="special">(</span><span class="identifier">h</span><span class="special">);</span>
+</pre>
+<p>
+          The associated allocator must satisfy the standard Allocator requirements.
+        </p>
+<p>
+          By default, handlers use the standard allocator (which is implemented in
+          terms of <code class="computeroutput"><span class="special">::</span><span class="keyword">operator</span>
+          <span class="keyword">new</span><span class="special">()</span></code>
+          and <code class="computeroutput"><span class="special">::</span><span class="keyword">operator</span>
+          <span class="keyword">delete</span><span class="special">()</span></code>).
+          The allocator may be customised for a particular handler type by specifying
+          a nested type <code class="computeroutput"><span class="identifier">allocator_type</span></code>
+          and member function <code class="computeroutput"><span class="identifier">get_allocator</span><span class="special">()</span></code>:
+        </p>
+<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">my_handler</span>
+<span class="special">{</span>
+<span class="keyword">public</span><span class="special">:</span>
+  <span class="comment">// Custom implementation of Allocator type requirements.</span>
+  <span class="keyword">typedef</span> <span class="identifier">my_allocator</span> <span class="identifier">allocator_type</span><span class="special">;</span>
+
+  <span class="comment">// Return a custom allocator implementation.</span>
+  <span class="identifier">allocator_type</span> <span class="identifier">get_allocator</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span>
+  <span class="special">{</span>
+    <span class="keyword">return</span> <span class="identifier">my_allocator</span><span class="special">();</span>
+  <span class="special">}</span>
+
+  <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()()</span> <span class="special">{</span> <span class="special">...</span> <span class="special">}</span>
+<span class="special">};</span>
+</pre>
+<p>
+          In more complex cases, the <code class="computeroutput"><span class="identifier">associated_allocator</span></code>
+          template may be partially specialised directly:
+        </p>
+<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">asio</span> <span class="special">{</span>
+
+  <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
+  <span class="keyword">struct</span> <span class="identifier">associated_allocator</span><span class="special">&lt;</span><span class="identifier">my_handler</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
+  <span class="special">{</span>
+    <span class="comment">// Custom implementation of Allocator type requirements.</span>
+    <span class="keyword">typedef</span> <span class="identifier">my_allocator</span> <span class="identifier">type</span><span class="special">;</span>
+
+    <span class="comment">// Return a custom allocator implementation.</span>
+    <span class="keyword">static</span> <span class="identifier">type</span> <span class="identifier">get</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">my_handler</span><span class="special">&amp;,</span>
+        <span class="keyword">const</span> <span class="identifier">Allocator</span><span class="special">&amp;</span> <span class="identifier">a</span> <span class="special">=</span> <span class="identifier">Allocator</span><span class="special">())</span> <span class="keyword">noexcept</span>
+    <span class="special">{</span>
+      <span class="keyword">return</span> <span class="identifier">my_allocator</span><span class="special">();</span>
+    <span class="special">}</span>
+  <span class="special">};</span>
+
+<span class="special">}</span> <span class="comment">// namespace asio</span>
+</pre>
+<p>
+          The implementation guarantees that the deallocation will occur before the
+          associated handler is invoked, which means the memory is ready to be reused
+          for any new asynchronous operations started by the handler.
+        </p>
+<p>
+          The custom memory allocation functions may be called from any user-created
+          thread that is calling an Asio library function. The implementation guarantees,
+          for the asynchronous operations included with the library, that within
+          the context of an individual operation the implementation will not make
+          concurrent calls to the memory allocation functions for that handler. The
+          implementation will insert appropriate memory barriers to ensure correct
+          memory visibility should an asynchronous operation need to call the allocation
+          functions from different threads. (Note: If the same allocator is shared
+          across multiple concurrent asynchronous operations, this can result in
+          concurrent calls to the memory allocation functions. Use of a <a class="link" href="strands.html" title="Strands: Use Threads Without Explicit Locking">strand</a>
+          does not prevent these concurrent calls, as an operation may need to allocate
+          memory from outside the strand. In this case, the shared allocator is responsible
+          for providing the necessary thread safety guarantees.)
+        </p>
+<h6>
+<a name="asio.overview.core.allocation.h0"></a>
+          <span><a name="asio.overview.core.allocation.see_also"></a></span><a class="link" href="allocation.html#asio.overview.core.allocation.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/associated_allocator.html" title="associated_allocator">associated_allocator</a>,
+          <a class="link" href="../../reference/get_associated_allocator.html" title="get_associated_allocator">get_associated_allocator</a>,
+          <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.allocation">custom memory allocation
+          example (C++03)</a>, <a class="link" href="../../examples/cpp11_examples.html#asio.examples.cpp11_examples.allocation">custom
+          memory allocation example (C++11)</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="line_based.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="cancellation.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/core/async.html

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+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>The Proactor Design Pattern: Concurrency Without Threads</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../core.html" title="Core Concepts and Functionality">
+<link rel="prev" href="../core.html" title="Core Concepts and Functionality">
+<link rel="next" href="threads.html" title="Threads and Asio">
+<meta name="viewport" content="width=device-width, initial-scale=1">
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+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../core.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="threads.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.core.async"></a><a class="link" href="async.html" title="The Proactor Design Pattern: Concurrency Without Threads">The Proactor Design Pattern:
+        Concurrency Without Threads</a>
+</h4></div></div></div>
+<p>
+          The Asio library offers side-by-side support for synchronous and asynchronous
+          operations. The asynchronous support is based on the Proactor design pattern
+          <a class="link" href="async.html#asio.overview.core.async.references">[POSA2]</a>. The
+          advantages and disadvantages of this approach, when compared to a synchronous-only
+          or Reactor approach, are outlined below.
+        </p>
+<h6>
+<a name="asio.overview.core.async.h0"></a>
+          <span><a name="asio.overview.core.async.proactor_and_asio"></a></span><a class="link" href="async.html#asio.overview.core.async.proactor_and_asio">Proactor
+          and Asio</a>
+        </h6>
+<p>
+          Let us examine how the Proactor design pattern is implemented in Asio,
+          without reference to platform-specific details.
+        </p>
+<p>
+          <span class="inlinemediaobject"><img src="../../../proactor.png"></span>
+        </p>
+<p>
+          <span class="bold"><strong>Proactor design pattern (adapted from [POSA2])</strong></span>
+        </p>
+<p>
+          — Asynchronous Operation
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Defines an operation that is executed asynchronously, such as an asynchronous
+            read or write on a socket.
+          </p></blockquote></div>
+<p>
+          — Asynchronous Operation Processor
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Executes asynchronous operations and queues events on a completion event
+            queue when operations complete. From a high-level point of view, internal
+            services like <code class="computeroutput"><span class="identifier">reactive_socket_service</span></code>
+            are asynchronous operation processors.
+          </p></blockquote></div>
+<p>
+          — Completion Event Queue
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Buffers completion events until they are dequeued by an asynchronous
+            event demultiplexer.
+          </p></blockquote></div>
+<p>
+          — Completion Handler
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Processes the result of an asynchronous operation. These are function
+            objects, often created using <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span></code>.
+          </p></blockquote></div>
+<p>
+          — Asynchronous Event Demultiplexer
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Blocks waiting for events to occur on the completion event queue, and
+            returns a completed event to its caller.
+          </p></blockquote></div>
+<p>
+          — Proactor
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Calls the asynchronous event demultiplexer to dequeue events, and dispatches
+            the completion handler (i.e. invokes the function object) associated
+            with the event. This abstraction is represented by the <code class="computeroutput"><span class="identifier">io_context</span></code> class.
+          </p></blockquote></div>
+<p>
+          — Initiator
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Application-specific code that starts asynchronous operations. The initiator
+            interacts with an asynchronous operation processor via a high-level interface
+            such as <code class="computeroutput"><span class="identifier">basic_stream_socket</span></code>,
+            which in turn delegates to a service like <code class="computeroutput"><span class="identifier">reactive_socket_service</span></code>.
+          </p></blockquote></div>
+<h6>
+<a name="asio.overview.core.async.h1"></a>
+          <span><a name="asio.overview.core.async.implementation_using_reactor"></a></span><a class="link" href="async.html#asio.overview.core.async.implementation_using_reactor">Implementation
+          Using Reactor</a>
+        </h6>
+<p>
+          On many platforms, Asio implements the Proactor design pattern in terms
+          of a Reactor, such as <code class="computeroutput"><span class="identifier">select</span></code>,
+          <code class="computeroutput"><span class="identifier">epoll</span></code> or <code class="computeroutput"><span class="identifier">kqueue</span></code>. This implementation approach
+          corresponds to the Proactor design pattern as follows:
+        </p>
+<p>
+          — Asynchronous Operation Processor
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            A reactor implemented using <code class="computeroutput"><span class="identifier">select</span></code>,
+            <code class="computeroutput"><span class="identifier">epoll</span></code> or <code class="computeroutput"><span class="identifier">kqueue</span></code>. When the reactor indicates
+            that the resource is ready to perform the operation, the processor executes
+            the asynchronous operation and enqueues the associated completion handler
+            on the completion event queue.
+          </p></blockquote></div>
+<p>
+          — Completion Event Queue
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            A linked list of completion handlers (i.e. function objects).
+          </p></blockquote></div>
+<p>
+          — Asynchronous Event Demultiplexer
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            This is implemented by waiting on an event or condition variable until
+            a completion handler is available in the completion event queue.
+          </p></blockquote></div>
+<h6>
+<a name="asio.overview.core.async.h2"></a>
+          <span><a name="asio.overview.core.async.implementation_using_windows_overlapped_i_o"></a></span><a class="link" href="async.html#asio.overview.core.async.implementation_using_windows_overlapped_i_o">Implementation
+          Using Windows Overlapped I/O</a>
+        </h6>
+<p>
+          On Windows NT, 2000 and XP, Vista, 7 and later, Asio takes advantage of
+          overlapped I/O to provide an efficient implementation of the Proactor design
+          pattern. This implementation approach corresponds to the Proactor design
+          pattern as follows:
+        </p>
+<p>
+          — Asynchronous Operation Processor
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            This is implemented by the operating system. Operations are initiated
+            by calling an overlapped function such as <code class="computeroutput"><span class="identifier">AcceptEx</span></code>.
+          </p></blockquote></div>
+<p>
+          — Completion Event Queue
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            This is implemented by the operating system, and is associated with an
+            I/O completion port. There is one I/O completion port for each <code class="computeroutput"><span class="identifier">io_context</span></code> instance.
+          </p></blockquote></div>
+<p>
+          — Asynchronous Event Demultiplexer
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Called by Asio to dequeue events and their associated completion handlers.
+          </p></blockquote></div>
+<h6>
+<a name="asio.overview.core.async.h3"></a>
+          <span><a name="asio.overview.core.async.advantages"></a></span><a class="link" href="async.html#asio.overview.core.async.advantages">Advantages</a>
+        </h6>
+<p>
+          — Portability.
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Many operating systems offer a native asynchronous I/O API (such as overlapped
+            I/O on <span class="emphasis"><em>Windows</em></span>) as the preferred option for developing
+            high performance network applications. The library may be implemented
+            in terms of native asynchronous I/O. However, if native support is not
+            available, the library may also be implemented using synchronous event
+            demultiplexors that typify the Reactor pattern, such as <span class="emphasis"><em>POSIX</em></span>
+            <code class="computeroutput"><span class="identifier">select</span><span class="special">()</span></code>.
+          </p></blockquote></div>
+<p>
+          — Decoupling threading from concurrency.
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Long-duration operations are performed asynchronously by the implementation
+            on behalf of the application. Consequently applications do not need to
+            spawn many threads in order to increase concurrency.
+          </p></blockquote></div>
+<p>
+          — Performance and scalability.
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Implementation strategies such as thread-per-connection (which a synchronous-only
+            approach would require) can degrade system performance, due to increased
+            context switching, synchronisation and data movement among CPUs. With
+            asynchronous operations it is possible to avoid the cost of context switching
+            by minimising the number of operating system threads — typically a limited
+            resource — and only activating the logical threads of control that have
+            events to process.
+          </p></blockquote></div>
+<p>
+          — Simplified application synchronisation.
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Asynchronous operation completion handlers can be written as though they
+            exist in a single-threaded environment, and so application logic can
+            be developed with little or no concern for synchronisation issues.
+          </p></blockquote></div>
+<p>
+          — Function composition.
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Function composition refers to the implementation of functions to provide
+            a higher-level operation, such as sending a message in a particular format.
+            Each function is implemented in terms of multiple calls to lower-level
+            read or write operations.
+          </p></blockquote></div>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            For example, consider a protocol where each message consists of a fixed-length
+            header followed by a variable length body, where the length of the body
+            is specified in the header. A hypothetical read_message operation could
+            be implemented using two lower-level reads, the first to receive the
+            header and, once the length is known, the second to receive the body.
+          </p></blockquote></div>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            To compose functions in an asynchronous model, asynchronous operations
+            can be chained together. That is, a completion handler for one operation
+            can initiate the next. Starting the first call in the chain can be encapsulated
+            so that the caller need not be aware that the higher-level operation
+            is implemented as a chain of asynchronous operations.
+          </p></blockquote></div>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            The ability to compose new operations in this way simplifies the development
+            of higher levels of abstraction above a networking library, such as functions
+            to support a specific protocol.
+          </p></blockquote></div>
+<h6>
+<a name="asio.overview.core.async.h4"></a>
+          <span><a name="asio.overview.core.async.disadvantages"></a></span><a class="link" href="async.html#asio.overview.core.async.disadvantages">Disadvantages</a>
+        </h6>
+<p>
+          — Program complexity.
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            It is more difficult to develop applications using asynchronous mechanisms
+            due to the separation in time and space between operation initiation
+            and completion. Applications may also be harder to debug due to the inverted
+            flow of control.
+          </p></blockquote></div>
+<p>
+          — Memory usage.
+        </p>
+<div class="blockquote"><blockquote class="blockquote"><p>
+            Buffer space must be committed for the duration of a read or write operation,
+            which may continue indefinitely, and a separate buffer is required for
+            each concurrent operation. The Reactor pattern, on the other hand, does
+            not require buffer space until a socket is ready for reading or writing.
+          </p></blockquote></div>
+<h6>
+<a name="asio.overview.core.async.h5"></a>
+          <span><a name="asio.overview.core.async.references"></a></span><a class="link" href="async.html#asio.overview.core.async.references">References</a>
+        </h6>
+<p>
+          [POSA2] D. Schmidt et al, <span class="emphasis"><em>Pattern Oriented Software Architecture,
+          Volume 2</em></span>. Wiley, 2000.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../core.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="threads.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/core/buffers.html

@@ -0,0 +1,258 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Buffers</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../core.html" title="Core Concepts and Functionality">
+<link rel="prev" href="strands.html" title="Strands: Use Threads Without Explicit Locking">
+<link rel="next" href="streams.html" title="Streams, Short Reads and Short Writes">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="strands.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="streams.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.core.buffers"></a><a class="link" href="buffers.html" title="Buffers">Buffers</a>
+</h4></div></div></div>
+<p>
+          Fundamentally, I/O involves the transfer of data to and from contiguous
+          regions of memory, called buffers. These buffers can be simply expressed
+          as a tuple consisting of a pointer and a size in bytes. However, to allow
+          the development of efficient network applications, Asio includes support
+          for scatter-gather operations. These operations involve one or more buffers:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              A scatter-read receives data into multiple buffers.
+            </li>
+<li class="listitem">
+              A gather-write transmits multiple buffers.
+            </li>
+</ul></div>
+<p>
+          Therefore we require an abstraction to represent a collection of buffers.
+          The approach used in Asio is to define a type (actually two types) to represent
+          a single buffer. These can be stored in a container, which may be passed
+          to the scatter-gather operations.
+        </p>
+<p>
+          In addition to specifying buffers as a pointer and size in bytes, Asio
+          makes a distinction between modifiable memory (called mutable) and non-modifiable
+          memory (where the latter is created from the storage for a const-qualified
+          variable). These two types could therefore be defined as follows:
+        </p>
+<pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">*,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">&gt;</span> <span class="identifier">mutable_buffer</span><span class="special">;</span>
+<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">&gt;</span> <span class="identifier">const_buffer</span><span class="special">;</span>
+</pre>
+<p>
+          Here, a mutable_buffer would be convertible to a const_buffer, but conversion
+          in the opposite direction is not valid.
+        </p>
+<p>
+          However, Asio does not use the above definitions as-is, but instead defines
+          two classes: <code class="computeroutput"><span class="identifier">mutable_buffer</span></code>
+          and <code class="computeroutput"><span class="identifier">const_buffer</span></code>. The goal
+          of these is to provide an opaque representation of contiguous memory, where:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              Types behave as std::pair would in conversions. That is, a <code class="computeroutput"><span class="identifier">mutable_buffer</span></code> is convertible to
+              a <code class="computeroutput"><span class="identifier">const_buffer</span></code>, but
+              the opposite conversion is disallowed.
+            </li>
+<li class="listitem">
+              There is protection against buffer overruns. Given a buffer instance,
+              a user can only create another buffer representing the same range of
+              memory or a sub-range of it. To provide further safety, the library
+              also includes mechanisms for automatically determining the size of
+              a buffer from an array, <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></code>
+              or <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span></code> of POD elements, or from a
+              <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>.
+            </li>
+<li class="listitem">
+              The underlying memory is explicitly accessed using the <code class="computeroutput"><span class="identifier">data</span><span class="special">()</span></code>
+              member function. In general an application should never need to do
+              this, but it is required by the library implementation to pass the
+              raw memory to the underlying operating system functions.
+            </li>
+</ul></div>
+<p>
+          Finally, multiple buffers can be passed to scatter-gather operations (such
+          as <a class="link" href="../../reference/read.html" title="read">read()</a> or <a class="link" href="../../reference/write.html" title="write">write()</a>)
+          by putting the buffer objects into a container. The <code class="computeroutput"><span class="identifier">MutableBufferSequence</span></code>
+          and <code class="computeroutput"><span class="identifier">ConstBufferSequence</span></code>
+          concepts have been defined so that containers such as <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span></code>,
+          <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">list</span></code>, <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">array</span></code>
+          or <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></code> can be used.
+        </p>
+<h6>
+<a name="asio.overview.core.buffers.h0"></a>
+          <span><a name="asio.overview.core.buffers.streambuf_for_integration_with_iostreams"></a></span><a class="link" href="buffers.html#asio.overview.core.buffers.streambuf_for_integration_with_iostreams">Streambuf
+          for Integration with Iostreams</a>
+        </h6>
+<p>
+          The class <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">basic_streambuf</span></code> is derived from <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_streambuf</span></code> to associate the input
+          sequence and output sequence with one or more objects of some character
+          array type, whose elements store arbitrary values. These character array
+          objects are internal to the streambuf object, but direct access to the
+          array elements is provided to permit them to be used with I/O operations,
+          such as the send or receive operations of a socket:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              The input sequence of the streambuf is accessible via the <a class="link" href="../../reference/basic_streambuf/data.html" title="basic_streambuf::data">data()</a>
+              member function. The return type of this function meets the <code class="computeroutput"><span class="identifier">ConstBufferSequence</span></code> requirements.
+            </li>
+<li class="listitem">
+              The output sequence of the streambuf is accessible via the <a class="link" href="../../reference/basic_streambuf/prepare.html" title="basic_streambuf::prepare">prepare()</a>
+              member function. The return type of this function meets the <code class="computeroutput"><span class="identifier">MutableBufferSequence</span></code> requirements.
+            </li>
+<li class="listitem">
+              Data is transferred from the front of the output sequence to the back
+              of the input sequence by calling the <a class="link" href="../../reference/basic_streambuf/commit.html" title="basic_streambuf::commit">commit()</a>
+              member function.
+            </li>
+<li class="listitem">
+              Data is removed from the front of the input sequence by calling the
+              <a class="link" href="../../reference/basic_streambuf/consume.html" title="basic_streambuf::consume">consume()</a>
+              member function.
+            </li>
+</ul></div>
+<p>
+          The streambuf constructor accepts a <code class="computeroutput"><span class="identifier">size_t</span></code>
+          argument specifying the maximum of the sum of the sizes of the input sequence
+          and output sequence. Any operation that would, if successful, grow the
+          internal data beyond this limit will throw a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">length_error</span></code>
+          exception.
+        </p>
+<h6>
+<a name="asio.overview.core.buffers.h1"></a>
+          <span><a name="asio.overview.core.buffers.bytewise_traversal_of_buffer_sequences"></a></span><a class="link" href="buffers.html#asio.overview.core.buffers.bytewise_traversal_of_buffer_sequences">Bytewise
+          Traversal of Buffer Sequences</a>
+        </h6>
+<p>
+          The <code class="computeroutput"><span class="identifier">buffers_iterator</span><span class="special">&lt;&gt;</span></code>
+          class template allows buffer sequences (i.e. types meeting <code class="computeroutput"><span class="identifier">MutableBufferSequence</span></code> or <code class="computeroutput"><span class="identifier">ConstBufferSequence</span></code> requirements) to
+          be traversed as though they were a contiguous sequence of bytes. Helper
+          functions called buffers_begin() and buffers_end() are also provided, where
+          the buffers_iterator&lt;&gt; template parameter is automatically deduced.
+        </p>
+<p>
+          As an example, to read a single line from a socket and into a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>, you may write:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">streambuf</span> <span class="identifier">sb</span><span class="special">;</span>
+<span class="special">...</span>
+<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">read_until</span><span class="special">(</span><span class="identifier">sock</span><span class="special">,</span> <span class="identifier">sb</span><span class="special">,</span> <span class="char">'\n'</span><span class="special">);</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">streambuf</span><span class="special">::</span><span class="identifier">const_buffers_type</span> <span class="identifier">bufs</span> <span class="special">=</span> <span class="identifier">sb</span><span class="special">.</span><span class="identifier">data</span><span class="special">();</span>
+<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">line</span><span class="special">(</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffers_begin</span><span class="special">(</span><span class="identifier">bufs</span><span class="special">),</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffers_begin</span><span class="special">(</span><span class="identifier">bufs</span><span class="special">)</span> <span class="special">+</span> <span class="identifier">n</span><span class="special">);</span>
+</pre>
+<h6>
+<a name="asio.overview.core.buffers.h2"></a>
+          <span><a name="asio.overview.core.buffers.buffer_literals"></a></span><a class="link" href="buffers.html#asio.overview.core.buffers.buffer_literals">Buffer
+          Literals</a>
+        </h6>
+<p>
+          The <code class="computeroutput"><span class="identifier">_buf</span></code> literal suffix,
+          defined in namespace <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_literals</span></code>,
+          may be used to create <code class="computeroutput"><span class="identifier">const_buffer</span></code>
+          objects from string, binary integer, and hexadecimal integer literals.
+          These buffer literals may be arbitrarily long. For example:
+        </p>
+<pre class="programlisting">using namespace asio::buffer_literals;
+
+asio::const_buffer b1 = "hello"_buf;
+asio::const_buffer b2 = 0xdeadbeef_buf;
+asio::const_buffer b3 = 0x01234567'89abcdef'01234567'89abcdef_buf;
+asio::const_buffer b4 = 0b1010101011001100_buf;
+</pre>
+<p>
+          The memory associated with a buffer literal is valid for the lifetime of
+          the program. This means that the buffer can be safely used with asynchronous
+          operations:
+        </p>
+<pre class="programlisting"><span class="identifier">async_write</span><span class="special">(</span><span class="identifier">my_socket</span><span class="special">,</span> <span class="string">"hello"</span><span class="identifier">_buf</span><span class="special">,</span> <span class="identifier">my_handler</span><span class="special">);</span>
+</pre>
+<h6>
+<a name="asio.overview.core.buffers.h3"></a>
+          <span><a name="asio.overview.core.buffers.buffer_debugging"></a></span><a class="link" href="buffers.html#asio.overview.core.buffers.buffer_debugging">Buffer
+          Debugging</a>
+        </h6>
+<p>
+          Some standard library implementations, such as the one that ships with
+          Microsoft Visual C++ 8.0 and later, provide a feature called iterator debugging.
+          What this means is that the validity of iterators is checked at runtime.
+          If a program tries to use an iterator that has been invalidated, an assertion
+          will be triggered. For example:
+        </p>
+<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">)</span>
+<span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">iterator</span> <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">v</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span>
+<span class="identifier">v</span><span class="special">.</span><span class="identifier">clear</span><span class="special">();</span> <span class="comment">// invalidates iterators</span>
+<span class="special">*</span><span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="comment">// assertion!</span>
+</pre>
+<p>
+          Asio takes advantage of this feature to add buffer debugging. Consider
+          the following code:
+        </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">dont_do_this</span><span class="special">()</span>
+<span class="special">{</span>
+ <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">msg</span> <span class="special">=</span> <span class="string">"Hello, world!"</span><span class="special">;</span>
+ <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_write</span><span class="special">(</span><span class="identifier">sock</span><span class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">msg</span><span class="special">),</span> <span class="identifier">my_handler</span><span class="special">);</span>
+<span class="special">}</span>
+</pre>
+<p>
+          When you call an asynchronous read or write you need to ensure that the
+          buffers for the operation are valid until the completion handler is called.
+          In the above example, the buffer is the <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code>
+          variable <code class="computeroutput"><span class="identifier">msg</span></code>. This variable
+          is on the stack, and so it goes out of scope before the asynchronous operation
+          completes. If you're lucky then the application will crash, but random
+          failures are more likely.
+        </p>
+<p>
+          When buffer debugging is enabled, Asio stores an iterator into the string
+          until the asynchronous operation completes, and then dereferences it to
+          check its validity. In the above example you would observe an assertion
+          failure just before Asio tries to call the completion handler.
+        </p>
+<p>
+          This feature is automatically made available for Microsoft Visual Studio
+          8.0 or later and for GCC when <code class="computeroutput"><span class="identifier">_GLIBCXX_DEBUG</span></code>
+          is defined. There is a performance cost to this checking, so buffer debugging
+          is only enabled in debug builds. For other compilers it may be enabled
+          by defining <code class="computeroutput"><span class="identifier">ASIO_ENABLE_BUFFER_DEBUGGING</span></code>.
+          It can also be explicitly disabled by defining <code class="computeroutput"><span class="identifier">ASIO_DISABLE_BUFFER_DEBUGGING</span></code>.
+        </p>
+<h6>
+<a name="asio.overview.core.buffers.h4"></a>
+          <span><a name="asio.overview.core.buffers.see_also"></a></span><a class="link" href="buffers.html#asio.overview.core.buffers.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/buffer.html" title="buffer">buffer</a>, <a class="link" href="../../reference/buffers_begin.html" title="buffers_begin">buffers_begin</a>,
+          <a class="link" href="../../reference/buffers_end.html" title="buffers_end">buffers_end</a>, <a class="link" href="../../reference/buffers_iterator.html" title="buffers_iterator">buffers_iterator</a>,
+          <a class="link" href="../../reference/const_buffer.html" title="const_buffer">const_buffer</a>, <a class="link" href="../../reference/const_buffers_1.html" title="const_buffers_1">const_buffers_1</a>, <a class="link" href="../../reference/mutable_buffer.html" title="mutable_buffer">mutable_buffer</a>, <a class="link" href="../../reference/mutable_buffers_1.html" title="mutable_buffers_1">mutable_buffers_1</a>,
+          <a class="link" href="../../reference/streambuf.html" title="streambuf">streambuf</a>, <a class="link" href="../../reference/ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>,
+          <a class="link" href="../../reference/MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>,
+          <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.buffers">buffers example (C++03)</a>,
+          <a class="link" href="../../examples/cpp11_examples.html#asio.examples.cpp11_examples.buffers">buffers example (c++11)</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="strands.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="streams.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/core/cancellation.html

@@ -0,0 +1,386 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Per-Operation Cancellation</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
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+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="allocation.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="handler_tracking.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.core.cancellation"></a><a class="link" href="cancellation.html" title="Per-Operation Cancellation">Per-Operation Cancellation</a>
+</h4></div></div></div>
+<div class="note"><table border="0" summary="Note">
+<tr>
+<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../note.png"></td>
+<th align="left">Note</th>
+</tr>
+<tr><td align="left" valign="top"><p>
+            These type requirements and classes are the low level building blocks
+            of cancellation. For most use cases, consider using a higher level abstraction,
+            such as <a class="link" href="../../reference/experimental__make_parallel_group.html" title="experimental::make_parallel_group">experimental::make_parallel_group</a>
+            or the <a class="link" href="../composition/cpp20_coroutines.html#asio.overview.composition.cpp20_coroutines.co_ordinating_parallel_coroutines">logical
+            operators</a> for <code class="computeroutput"><span class="identifier">awaitable</span></code>.
+          </p></td></tr>
+</table></div>
+<p>
+          I/O objects, such as sockets and timers, support object-wide cancellation
+          of outstanding asynchronous operations via their <code class="computeroutput"><span class="identifier">close</span></code>
+          or <code class="computeroutput"><span class="identifier">cancel</span></code> member functions.
+          However, certain asynchronous operations also support individual, targeted
+          cancellation. This per-operation cancellation is enabled by specifying
+          that a completion handler has an <a class="link" href="../../reference/associated_cancellation_slot.html" title="associated_cancellation_slot">associated
+          cancellation slot</a> which satisfies the <a class="link" href="../../reference/CancellationSlot.html" title="Cancellation slot requirements">CancellationSlot</a>
+          type requirements. A cancellation slot is a lightweight channel used for
+          delivering a cancellation request.
+        </p>
+<p>
+          Given a copy of a user-defined <code class="computeroutput"><span class="identifier">Handler</span></code>
+          object <code class="computeroutput"><span class="identifier">h</span></code>, if an asynchronous
+          operation supports cancellation it will obtain a cancellation slot using
+          the <code class="computeroutput"><span class="identifier">get_associated_cancellation_slot</span></code>
+          function. For example:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">associated_cancellation_slot_t</span><span class="special">&lt;</span><span class="identifier">Handler</span><span class="special">&gt;</span> <span class="identifier">s</span>
+  <span class="special">=</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">get_associated_cancellation_slot</span><span class="special">(</span><span class="identifier">h</span><span class="special">);</span>
+</pre>
+<p>
+          The associated cancellation slot must satisfy the CancellationSlot type
+          requirements.
+        </p>
+<p>
+          By default, handlers use a default-constructed <a class="link" href="../../reference/cancellation_slot.html" title="cancellation_slot"><code class="computeroutput"><span class="identifier">cancellation_slot</span></code></a>, which means
+          that per-operation cancellation is disabled. The cancellation slot may
+          be customised for a particular handler type by specifying a nested type
+          <code class="computeroutput"><span class="identifier">cancellation_slot_type</span></code>
+          and member function <code class="computeroutput"><span class="identifier">get_cancellation_slot</span><span class="special">()</span></code>:
+        </p>
+<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">my_handler</span>
+<span class="special">{</span>
+<span class="keyword">public</span><span class="special">:</span>
+  <span class="comment">// Custom implementation of CancellationSlot type requirements.</span>
+  <span class="keyword">typedef</span> <span class="identifier">my_cancellation_slot</span> <span class="identifier">cancellation_slot_type</span><span class="special">;</span>
+
+  <span class="comment">// Return a custom cancellation slot implementation.</span>
+  <span class="identifier">cancellation_slot_type</span> <span class="identifier">get_cancellation_slot</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span>
+  <span class="special">{</span>
+    <span class="keyword">return</span> <span class="identifier">my_cancellation_slot</span><span class="special">(...);</span>
+  <span class="special">}</span>
+
+  <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()()</span> <span class="special">{</span> <span class="special">...</span> <span class="special">}</span>
+<span class="special">};</span>
+</pre>
+<p>
+          In more complex cases, the <code class="computeroutput"><span class="identifier">associated_cancellation_slot</span></code>
+          template may be partially specialised directly:
+        </p>
+<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">asio</span> <span class="special">{</span>
+
+  <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">CancellationSlot</span><span class="special">&gt;</span>
+  <span class="keyword">struct</span> <span class="identifier">associated_cancellation_slot</span><span class="special">&lt;</span><span class="identifier">my_handler</span><span class="special">,</span> <span class="identifier">CancellationSlot</span><span class="special">&gt;</span>
+  <span class="special">{</span>
+    <span class="comment">// Custom implementation of CancellationSlot type requirements.</span>
+    <span class="keyword">typedef</span> <span class="identifier">my_cancellation_slot</span> <span class="identifier">type</span><span class="special">;</span>
+
+    <span class="comment">// Return a custom cancellation_slot implementation.</span>
+    <span class="keyword">static</span> <span class="identifier">type</span> <span class="identifier">get</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">my_handler</span><span class="special">&amp;,</span>
+        <span class="keyword">const</span> <span class="identifier">CancellationSlot</span><span class="special">&amp;</span> <span class="identifier">a</span> <span class="special">=</span> <span class="identifier">CancellationSlot</span><span class="special">())</span> <span class="keyword">noexcept</span>
+    <span class="special">{</span>
+      <span class="keyword">return</span> <span class="identifier">my_cancellation_slot</span><span class="special">(...);</span>
+    <span class="special">}</span>
+  <span class="special">};</span>
+
+<span class="special">}</span> <span class="comment">// namespace asio</span>
+</pre>
+<p>
+          For convenience, a cancellation slot may be associated with a handler by
+          using the <a class="link" href="../../reference/bind_cancellation_slot.html" title="bind_cancellation_slot"><code class="computeroutput"><span class="identifier">bind_cancellation_slot</span></code></a> function.
+          This is particularly useful when associating a cancellation slot with a
+          lambda:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_read</span><span class="special">(</span><span class="identifier">my_socket</span><span class="special">,</span> <span class="identifier">my_buffer</span><span class="special">,</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">bind_cancellation_slot</span><span class="special">(</span>
+      <span class="identifier">my_cancellation_slot</span><span class="special">,</span>
+      <span class="special">[](</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="special">...</span>
+      <span class="special">}</span>
+    <span class="special">)</span>
+  <span class="special">);</span>
+</pre>
+<p>
+          Asio provides a ready-to-use cancellation slot in the form of <a class="link" href="../../reference/cancellation_slot.html" title="cancellation_slot"><code class="computeroutput"><span class="identifier">cancellation_slot</span></code></a> and its counterpart
+          <a class="link" href="../../reference/cancellation_signal.html" title="cancellation_signal"><code class="computeroutput"><span class="identifier">cancellation_signal</span></code></a>.
+          These two classes implement a one-to-one pairing of producer (signal) and
+          consumer (slot) interfaces. The following example shows its use:
+        </p>
+<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">session</span>
+  <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">enable_shared_from_this</span><span class="special">&lt;</span><span class="identifier">proxy</span><span class="special">&gt;</span>
+<span class="special">{</span>
+  <span class="special">...</span>
+
+  <span class="keyword">void</span> <span class="identifier">do_read</span><span class="special">()</span>
+  <span class="special">{</span>
+    <span class="keyword">auto</span> <span class="identifier">self</span> <span class="special">=</span> <span class="identifier">shared_from_this</span><span class="special">();</span>
+    <span class="identifier">socket_</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span>
+        <span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data_</span><span class="special">),</span>
+        <span class="identifier">asio</span><span class="special">::</span><span class="identifier">bind_cancellation_slot</span><span class="special">(</span>
+          <span class="identifier">cancel_signal_</span><span class="special">.</span><span class="identifier">slot</span><span class="special">(),</span>
+          <span class="special">[</span><span class="identifier">self</span><span class="special">](</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">error</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">)</span>
+          <span class="special">{</span>
+            <span class="special">...</span>
+          <span class="special">}</span>
+        <span class="special">)</span>
+      <span class="special">);</span>
+  <span class="special">}</span>
+
+  <span class="special">...</span>
+
+  <span class="keyword">void</span> <span class="identifier">request_cancel</span><span class="special">()</span>
+  <span class="special">{</span>
+    <span class="identifier">cancel_signal_</span><span class="special">.</span><span class="identifier">emit</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">cancellation_type</span><span class="special">::</span><span class="identifier">total</span><span class="special">);</span>
+  <span class="special">}</span>
+
+  <span class="special">...</span>
+
+  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">cancellation_signal</span> <span class="identifier">cancel_signal_</span><span class="special">;</span>
+<span class="special">};</span>
+</pre>
+<p>
+          A <code class="computeroutput"><span class="identifier">cancellation_signal</span></code> contains
+          a single slot, and consequently a cancellation signal/slot pair may be
+          used with at most one operation at a time. However, the same slot may be
+          reused for subsequent operations.
+        </p>
+<p>
+          To support cancellation, an asynchronous operation installs a cancellation
+          handler into the slot by calling the slot's <code class="computeroutput"><span class="identifier">assign</span></code>
+          or <code class="computeroutput"><span class="identifier">emplace</span></code> functions. This
+          handler will be invoked when a cancellation signal is emitted. A slot holds
+          exactly one handler at a time, and installing a new handler will overwrite
+          any previously installed handler.
+        </p>
+<p>
+          When emitting a cancellation signal, the caller must specify a <a class="link" href="../../reference/cancellation_type.html" title="cancellation_type">cancellation
+          type</a>. This value is a bitmask that dictates what guarantees the
+          cancellation target must make if successful cancellation occurs. The possible
+          bit values are, from weakest to strongest guarantee, are:
+        </p>
+<div class="table">
+<a name="asio.overview.core.cancellation.t0"></a><p class="title"><b>Table 1. cancellation types</b></p>
+<div class="table-contents"><table class="table" summary="cancellation types">
+<colgroup>
+<col>
+<col>
+<col>
+</colgroup>
+<thead><tr>
+<th>
+                  <p>
+                    Bit
+                  </p>
+                </th>
+<th>
+                  <p>
+                    Guarantee if cancellation is successful
+                  </p>
+                </th>
+<th>
+                  <p>
+                    Examples where this is the strongest supported guarantee
+                  </p>
+                </th>
+</tr></thead>
+<tbody>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">terminal</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    The operation had unspecified side effects, and it is only safe
+                    to close or destroy the I/O object.
+                  </p>
+                </td>
+<td>
+                  <p>
+                    A stateful implementation of a message framing protocol, where
+                    an asynchronous operation sends or receives a complete message.
+                    If cancellation occurs part-way through the message body, it
+                    is not possible to report a sensible state to the completion
+                    handler.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">partial</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    The operation had well-defined side effects, and the completion
+                    handler for the operation indicates what these side effects were.
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Composed operations such as <code class="computeroutput"><span class="identifier">async_read</span></code>
+                    and <code class="computeroutput"><span class="identifier">async_write</span></code>.
+                    If cancellation occurs before all bytes are transferred, the
+                    completion handler is passed the total bytes transferred so far.
+                    The caller may use this information to start another operation
+                    to transfer the remaining bytes.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">total</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    The operation had no side effects that are observable through
+                    the API.
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Low level system calls that transfer either zero or non-zero
+                    bytes.<br> <br> Wait-for-readiness operations that have no
+                    side effects, even when successful.<br> <br> A fully buffered
+                    message framing protocol implementation, where partial messages
+                    are stored so that they may be reused on the next operation.
+                  </p>
+                </td>
+</tr>
+</tbody>
+</table></div>
+</div>
+<br class="table-break"><p>
+          For example, if application logic requires that an operation complete with
+          all-or-nothing side effects, it should emit only the <code class="computeroutput"><span class="identifier">total</span></code>
+          cancellation type. If this type is unsupported by the target operation,
+          no cancellation will occur.
+        </p>
+<p>
+          Furthermore, a stronger guarantee always satisfies the requirements of
+          a weaker guarantee. The <code class="computeroutput"><span class="identifier">partial</span></code>
+          guarantee still satisfies the <code class="computeroutput"><span class="identifier">terminal</span></code>
+          guarantee. The <code class="computeroutput"><span class="identifier">total</span></code> guarantee
+          satisfies both <code class="computeroutput"><span class="identifier">partial</span></code>
+          and <code class="computeroutput"><span class="identifier">total</span></code>. This means that
+          when an operation supports a given cancellation type as its strongest guarantee,
+          it should honour cancellation requests for any of the weaker guarantees.
+        </p>
+<p>
+          Cancellation requests should not be emitted during an asynchronous operation's
+          initiating function. Cancellation requests that are emitted before an operation
+          starts have no effect. Similarly, cancellation requests made after completion
+          have no effect.
+        </p>
+<p>
+          When emitting a cancellation signal, the thread safety rules apply as if
+          calling a member function on the target operation's I/O object. For non-composed
+          operations, this means that it is safe to emit the cancellation signal
+          from any thread provided there are no other concurrent calls to the I/O
+          object, and no other concurrent cancellation signal requests. For composed
+          operations, care must be taken to ensure the cancellation request does
+          not occur concurrently with the operation's intermediate completion handlers.
+        </p>
+<h6>
+<a name="asio.overview.core.cancellation.h0"></a>
+          <span><a name="asio.overview.core.cancellation.supported_operations"></a></span><a class="link" href="cancellation.html#asio.overview.core.cancellation.supported_operations">Supported
+          Operations</a>
+        </h6>
+<p>
+          Consult the documentation for individual asynchronous operations for their
+          supported cancellation types, if any. The ability to cancel individual
+          operations, or composed operations, is currently supported by:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              timers
+            </li>
+<li class="listitem">
+              sockets on POSIX and Windows
+            </li>
+<li class="listitem">
+              POSIX descriptors
+            </li>
+<li class="listitem">
+              Windows HANDLEs
+            </li>
+<li class="listitem">
+              signal sets
+            </li>
+<li class="listitem">
+              serial ports
+            </li>
+<li class="listitem">
+              SSL streams
+            </li>
+<li class="listitem">
+              all Asio-provided composed operations such as <code class="computeroutput"><span class="identifier">async_read</span></code>
+              and <code class="computeroutput"><span class="identifier">async_write</span></code>
+            </li>
+<li class="listitem">
+              compositions based on <code class="computeroutput"><span class="identifier">async_compose</span></code>
+            </li>
+<li class="listitem">
+              C++20 coroutines that use <code class="computeroutput"><span class="identifier">awaitable</span></code>
+            </li>
+<li class="listitem">
+              C++20 coroutines that use <code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">coro</span></code>
+            </li>
+<li class="listitem">
+              the <code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">parallel_group</span></code> operation
+            </li>
+<li class="listitem">
+              the <code class="computeroutput"><span class="identifier">experimental</span><span class="special">::</span><span class="identifier">promise</span></code> class
+            </li>
+</ul></div>
+<h6>
+<a name="asio.overview.core.cancellation.h1"></a>
+          <span><a name="asio.overview.core.cancellation.see_also"></a></span><a class="link" href="cancellation.html#asio.overview.core.cancellation.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/CancellationSlot.html" title="Cancellation slot requirements">CancellationSlot</a>,
+          <a class="link" href="../../reference/associated_cancellation_slot.html" title="associated_cancellation_slot">associated_cancellation_slot</a>,
+          <a class="link" href="../../reference/bind_cancellation_slot.html" title="bind_cancellation_slot">bind_cancellation_slot</a>,
+          <a class="link" href="../../reference/cancellation_signal.html" title="cancellation_signal">cancellation_signal</a>,
+          <a class="link" href="../../reference/cancellation_slot.html" title="cancellation_slot">cancellation_slot</a>,
+          <a class="link" href="../../reference/cancellation_state.html" title="cancellation_state">cancellation_state</a>,
+          <a class="link" href="../../reference/cancellation_type.html" title="cancellation_type">cancellation_type</a>,
+          <a class="link" href="../../reference/get_associated_cancellation_slot.html" title="get_associated_cancellation_slot">get_associated_cancellation_slot</a>,
+          <a class="link" href="../../reference/experimental__parallel_group.html" title="experimental::parallel_group">experimental::parallel_group</a>,
+          <a class="link" href="../../reference/experimental__make_parallel_group.html" title="experimental::make_parallel_group">experimental::make_parallel_group</a>
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="allocation.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="handler_tracking.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/core/concurrency_hint.html

@@ -0,0 +1,173 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Concurrency Hints</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../core.html" title="Core Concepts and Functionality">
+<link rel="prev" href="handler_tracking.html" title="Handler Tracking">
+<link rel="next" href="../composition.html" title="Composition and Completion Tokens">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="handler_tracking.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../composition.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.core.concurrency_hint"></a><a class="link" href="concurrency_hint.html" title="Concurrency Hints">Concurrency Hints</a>
+</h4></div></div></div>
+<p>
+          The <a class="link" href="../../reference/io_context/io_context.html" title="io_context::io_context"><code class="computeroutput"><span class="identifier">io_context</span></code> constructor</a> allows
+          programs to specify a concurrency hint. This is a suggestion to the <code class="computeroutput"><span class="identifier">io_context</span></code> implementation as to the number
+          of active threads that should be used for running completion handlers.
+        </p>
+<p>
+          When the Windows I/O completion port backend is in use, this value is passed
+          to <code class="literal">CreateIoCompletionPort</code>.
+        </p>
+<p>
+          When a reactor-based backend is used, the implementation recognises the
+          following special concurrency hint values:
+        </p>
+<div class="informaltable"><table class="table">
+<colgroup>
+<col>
+<col>
+</colgroup>
+<thead><tr>
+<th>
+                  <p>
+                    Value
+                  </p>
+                </th>
+<th>
+                  <p>
+                    Description
+                  </p>
+                </th>
+</tr></thead>
+<tbody>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="number">1</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    The implementation assumes that the <code class="computeroutput"><span class="identifier">io_context</span></code>
+                    will be run from a single thread, and applies several optimisations
+                    based on this assumption.
+                  </p>
+                  <p>
+                    For example, when a handler is posted from within another handler,
+                    the new handler is added to a fast thread-local queue (with the
+                    consequence that the new handler is held back until the currently
+                    executing handler finishes).
+                  </p>
+                  <p>
+                    The <code class="computeroutput"><span class="identifier">io_context</span></code>
+                    still provides full thread safety, and distinct I/O objects may
+                    be used from any thread.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_CONCURRENCY_HINT_UNSAFE</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    This special concurrency hint disables locking in both the scheduler
+                    and reactor I/O. This hint has the following restrictions:
+                  </p>
+                  <p>
+                    — Care must be taken to ensure that all operations on the <code class="computeroutput"><span class="identifier">io_context</span></code> and any of its associated
+                    I/O objects (such as sockets and timers) occur in only one thread
+                    at a time.
+                  </p>
+                  <p>
+                    — Asynchronous resolve operations fail with <code class="computeroutput"><span class="identifier">operation_not_supported</span></code>.
+                  </p>
+                  <p>
+                    — If a <code class="computeroutput"><span class="identifier">signal_set</span></code>
+                    is used with the <code class="computeroutput"><span class="identifier">io_context</span></code>,
+                    <code class="computeroutput"><span class="identifier">signal_set</span></code> objects
+                    cannot be used with any other io_context in the program.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_CONCURRENCY_HINT_UNSAFE_IO</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    This special concurrency hint disables locking in the reactor
+                    I/O. This hint has the following restrictions:
+                  </p>
+                  <p>
+                    — Care must be taken to ensure that the <span class="emphasis"><em>run functions</em></span>
+                    on the <code class="computeroutput"><span class="identifier">io_context</span></code>
+                    (i.e. <code class="computeroutput"><span class="identifier">run</span></code>, <code class="computeroutput"><span class="identifier">run_for</span></code>, <code class="computeroutput"><span class="identifier">run_until</span></code>,
+                    <code class="computeroutput"><span class="identifier">run_one</span></code>, <code class="computeroutput"><span class="identifier">run_one_for</span></code>, <code class="computeroutput"><span class="identifier">run_one_until</span></code>, <code class="computeroutput"><span class="identifier">poll</span></code>, and <code class="computeroutput"><span class="identifier">poll_one</span></code>),
+                    and all operations on the context's associated I/O objects (such
+                    as sockets and timers), occur in only one thread at a time.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_CONCURRENCY_HINT_SAFE</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    The default. The <code class="computeroutput"><span class="identifier">io_context</span></code>
+                    provides full thread safety, and distinct I/O objects may be
+                    used from any thread.
+                  </p>
+                </td>
+</tr>
+</tbody>
+</table></div>
+<p>
+          The concurrency hint used by default-constructed <code class="computeroutput">io_context</code>
+          objects can be overridden at compile time by defining the <code class="computeroutput">ASIO_CONCURRENCY_HINT_DEFAULT</code>
+          macro. For example, specifying
+        </p>
+<pre class="programlisting">-DASIO_CONCURRENCY_HINT_DEFAULT=1
+</pre>
+<p>
+          on the compiler command line means that a concurrency hint of <code class="computeroutput">1</code>
+          is used for all default-constructed <code class="computeroutput">io_context</code> objects in
+          the program. Similarly, the concurrency hint used by <code class="computeroutput">io_context</code>
+          objects constructed with <code class="computeroutput">1</code> can be overridden by defining
+          <code class="computeroutput">ASIO_CONCURRENCY_HINT_1</code>. For example, passing
+        </p>
+<pre class="programlisting">-DASIO_CONCURRENCY_HINT_1=ASIO_CONCURRENCY_HINT_UNSAFE
+</pre>
+<p>
+          to the compiler will disable thread safety for all of these objects.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="handler_tracking.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../composition.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/core/handler_tracking.html

@@ -0,0 +1,487 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Handler Tracking</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../core.html" title="Core Concepts and Functionality">
+<link rel="prev" href="cancellation.html" title="Per-Operation Cancellation">
+<link rel="next" href="concurrency_hint.html" title="Concurrency Hints">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cancellation.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="concurrency_hint.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.core.handler_tracking"></a><a class="link" href="handler_tracking.html" title="Handler Tracking">Handler Tracking</a>
+</h4></div></div></div>
+<p>
+          To aid in debugging asynchronous programs, Asio provides support for handler
+          tracking. When enabled by defining <code class="computeroutput"><span class="identifier">ASIO_ENABLE_HANDLER_TRACKING</span></code>,
+          Asio writes debugging output to the standard error stream. The output records
+          asynchronous operations and the relationships between their handlers.
+        </p>
+<p>
+          This feature is useful when debugging and you need to know how your asynchronous
+          operations are chained together, or what the pending asynchronous operations
+          are. As an illustration, here is the output when you run the HTTP Server
+          example, handle a single request, then shut down via Ctrl+C:
+        </p>
+<pre class="programlisting">@asio|1589424178.741850|0*1|signal_set@0x7ffee977d878.async_wait
+@asio|1589424178.742593|0*2|socket@0x7ffee977d8a8.async_accept
+@asio|1589424178.742619|.2|non_blocking_accept,ec=asio.system:11
+@asio|1589424178.742625|0|resolver@0x7ffee977d760.cancel
+@asio|1589424195.830382|.2|non_blocking_accept,ec=system:0
+@asio|1589424195.830413|&gt;2|ec=system:0
+@asio|1589424195.830473|2*3|socket@0x7fa71d808230.async_receive
+@asio|1589424195.830496|.3|non_blocking_recv,ec=system:0,bytes_transferred=151
+@asio|1589424195.830503|2*4|socket@0x7ffee977d8a8.async_accept
+@asio|1589424195.830507|.4|non_blocking_accept,ec=asio.system:11
+@asio|1589424195.830510|&lt;2|
+@asio|1589424195.830529|&gt;3|ec=system:0,bytes_transferred=151
+@asio|1589424195.831143|3^5|in 'async_write' (./../../../include/asio/impl/write.hpp:330)
+@asio|1589424195.831143|3*5|socket@0x7fa71d808230.async_send
+@asio|1589424195.831186|.5|non_blocking_send,ec=system:0,bytes_transferred=1090
+@asio|1589424195.831194|&lt;3|
+@asio|1589424195.831218|&gt;5|ec=system:0,bytes_transferred=1090
+@asio|1589424195.831263|5|socket@0x7fa71d808230.close
+@asio|1589424195.831298|&lt;5|
+@asio|1589424199.793770|&gt;1|ec=system:0,signal_number=2
+@asio|1589424199.793781|1|socket@0x7ffee977d8a8.close
+@asio|1589424199.793809|&lt;1|
+@asio|1589424199.793840|&gt;4|ec=asio.system:125
+@asio|1589424199.793854|&lt;4|
+@asio|1589424199.793883|0|signal_set@0x7ffee977d878.cancel
+</pre>
+<p>
+          Each line is of the form:
+        </p>
+<pre class="programlisting">&lt;tag&gt;|&lt;timestamp&gt;|&lt;action&gt;|&lt;description&gt;
+</pre>
+<p>
+          The <code class="computeroutput">&lt;tag&gt;</code> is always <code class="computeroutput">@asio</code>, and is used
+          to identify and extract the handler tracking messages from the program
+          output.
+        </p>
+<p>
+          The <code class="computeroutput">&lt;timestamp&gt;</code> is seconds and microseconds from 1 Jan
+          1970 UTC.
+        </p>
+<p>
+          The <code class="computeroutput">&lt;action&gt;</code> takes one of the following forms:
+        </p>
+<div class="variablelist">
+<p class="title"><b></b></p>
+<dl>
+<dt><span class="term">&gt;n</span></dt>
+<dd><p>
+                The program entered the handler number <code class="computeroutput">n</code>. The <code class="computeroutput">&lt;description&gt;</code>
+                shows the arguments to the handler.
+              </p></dd>
+<dt><span class="term">&lt;n</span></dt>
+<dd><p>
+                The program left handler number <code class="computeroutput">n</code>.
+              </p></dd>
+<dt><span class="term">!n</span></dt>
+<dd><p>
+                The program left handler number n due to an exception.
+              </p></dd>
+<dt><span class="term">~n</span></dt>
+<dd><p>
+                The handler number <code class="computeroutput">n</code> was destroyed without having been
+                invoked. This is usually the case for any unfinished asynchronous
+                operations when the <code class="computeroutput">io_context</code> is destroyed.
+              </p></dd>
+<dt><span class="term">n^m</span></dt>
+<dd><p>
+                The handler number <code class="computeroutput">n</code> is about to create a new asynchronous
+                operation with completion handler number <code class="computeroutput">m</code>. The <code class="computeroutput">&lt;description&gt;</code>
+                contains source location information to help identify where in the
+                program the asynchronous operation is being started.
+              </p></dd>
+<dt><span class="term">n*m</span></dt>
+<dd><p>
+                The handler number <code class="computeroutput">n</code> created a new asynchronous operation
+                with completion handler number <code class="computeroutput">m</code>. The <code class="computeroutput">&lt;description&gt;</code>
+                shows what asynchronous operation was started.
+              </p></dd>
+<dt><span class="term">n</span></dt>
+<dd><p>
+                The handler number <code class="computeroutput">n</code> performed some other operation.
+                The <code class="computeroutput">&lt;description&gt;</code> shows what function was called.
+                Currently only <code class="computeroutput">close()</code> and <code class="computeroutput">cancel()</code> operations
+                are logged, as these may affect the state of pending asynchronous
+                operations.
+              </p></dd>
+<dt><span class="term">.n</span></dt>
+<dd><p>
+                The implementation performed a system call as part of the asynchronous
+                operation for which handler number <code class="computeroutput">n</code> is the completion
+                handler. The <code class="computeroutput">&lt;description&gt;</code> shows what function
+                was called and its results. These tracking events are only emitted
+                when using a reactor-based implementation.
+              </p></dd>
+</dl>
+</div>
+<p>
+          Where the <code class="computeroutput">&lt;description&gt;</code> shows a synchronous or asynchronous
+          operation, the format is <code class="computeroutput">&lt;object-type&gt;@&lt;pointer&gt;.&lt;operation&gt;</code>.
+          For handler entry, it shows a comma-separated list of arguments and their
+          values.
+        </p>
+<p>
+          As shown above, Each handler is assigned a numeric identifier. Where the
+          handler tracking output shows a handler number of 0, it means that the
+          action was performed outside of any handler.
+        </p>
+<h6>
+<a name="asio.overview.core.handler_tracking.h0"></a>
+          <span><a name="asio.overview.core.handler_tracking.adding_location_information"></a></span><a class="link" href="handler_tracking.html#asio.overview.core.handler_tracking.adding_location_information">Adding
+          Location Information</a>
+        </h6>
+<p>
+          Programs may augment the handler tracking output's location information
+          by using the macro <code class="computeroutput"><span class="identifier">ASIO_HANDLER_LOCATION</span></code>
+          in the source code. For example:
+        </p>
+<pre class="programlisting"><span class="preprocessor">#define</span> <span class="identifier">HANDLER_LOCATION</span> <span class="special">\</span>
+  <span class="identifier">ASIO_HANDLER_LOCATION</span><span class="special">((</span><span class="identifier">__FILE__</span><span class="special">,</span> <span class="identifier">__LINE__</span><span class="special">,</span> <span class="identifier">__func__</span><span class="special">))</span>
+
+<span class="comment">// ...</span>
+
+<span class="keyword">void</span> <span class="identifier">do_read</span><span class="special">()</span>
+<span class="special">{</span>
+  <span class="identifier">HANDLER_LOCATION</span><span class="special">;</span>
+
+  <span class="keyword">auto</span> <span class="identifier">self</span><span class="special">(</span><span class="identifier">shared_from_this</span><span class="special">());</span>
+  <span class="identifier">socket_</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data_</span><span class="special">,</span> <span class="identifier">max_length</span><span class="special">),</span>
+      <span class="special">[</span><span class="keyword">this</span><span class="special">,</span> <span class="identifier">self</span><span class="special">](</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">length</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="identifier">HANDLER_LOCATION</span><span class="special">;</span>
+
+        <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">ec</span><span class="special">)</span>
+        <span class="special">{</span>
+          <span class="identifier">do_write</span><span class="special">(</span><span class="identifier">length</span><span class="special">);</span>
+        <span class="special">}</span>
+      <span class="special">});</span>
+<span class="special">}</span>
+</pre>
+<p>
+          With the additional location information available, the handler tracking
+          output may include a call stack of source locations:
+        </p>
+<pre class="programlisting">@asio|1589423304.861944|&gt;7|ec=system:0,bytes_transferred=5
+@asio|1589423304.861952|7^8|in 'async_write' (./../../../include/asio/impl/write.hpp:330)
+@asio|1589423304.861952|7^8|called from 'do_write' (handler_tracking/async_tcp_echo_server.cpp:62)
+@asio|1589423304.861952|7^8|called from 'operator()' (handler_tracking/async_tcp_echo_server.cpp:51)
+@asio|1589423304.861952|7*8|socket@0x7ff61c008230.async_send
+@asio|1589423304.861975|.8|non_blocking_send,ec=system:0,bytes_transferred=5
+@asio|1589423304.861980|&lt;7|
+</pre>
+<p>
+          Furthermore, if <code class="computeroutput">std::source_location</code> or <code class="computeroutput">std::experimental::source_location</code>
+          are available, the <a class="link" href="../../reference/use_awaitable_t.html" title="use_awaitable_t"><code class="computeroutput">use_awaitable_t</code></a>
+          token (when default-constructed or used as a default completion token)
+          will also cause handler tracking to output a source location for each newly
+          created asynchronous operation. A <code class="computeroutput">use_awaitable_t</code> object may
+          also be explicitly constructed with location information.
+        </p>
+<h6>
+<a name="asio.overview.core.handler_tracking.h1"></a>
+          <span><a name="asio.overview.core.handler_tracking.visual_representations"></a></span><a class="link" href="handler_tracking.html#asio.overview.core.handler_tracking.visual_representations">Visual
+          Representations</a>
+        </h6>
+<p>
+          The handler tracking output may be post-processed using the included <code class="literal">handlerviz.pl</code>
+          tool to create a visual representation of the handlers (requires the GraphViz
+          tool <code class="literal">dot</code>).
+        </p>
+<h6>
+<a name="asio.overview.core.handler_tracking.h2"></a>
+          <span><a name="asio.overview.core.handler_tracking.custom_tracking"></a></span><a class="link" href="handler_tracking.html#asio.overview.core.handler_tracking.custom_tracking">Custom Tracking</a>
+        </h6>
+<p>
+          Handling tracking may be customised by defining the <code class="computeroutput"><span class="identifier">ASIO_CUSTOM_HANDLER_TRACKING</span></code>
+          macro to the name of a header file (enclosed in <code class="computeroutput"><span class="string">""</span></code>
+          or <code class="computeroutput"><span class="special">&lt;&gt;</span></code>). This header
+          file must implement the following preprocessor macros:
+        </p>
+<div class="informaltable"><table class="table">
+<colgroup>
+<col>
+<col>
+</colgroup>
+<thead><tr>
+<th>
+                  <p>
+                    Macro
+                  </p>
+                </th>
+<th>
+                  <p>
+                    Description
+                  </p>
+                </th>
+</tr></thead>
+<tbody>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_INHERIT_TRACKED_HANDLER</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Specifies a base class for classes that implement asynchronous
+                    operations. When used, the macro immediately follows the class
+                    name, so it must have the form <code class="computeroutput"><span class="special">:</span>
+                    <span class="keyword">public</span> <span class="identifier">my_class</span></code>.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_ALSO_INHERIT_TRACKED_HANDLER</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Specifies a base class for classes that implement asynchronous
+                    operations. When used, the macro follows other base classes,
+                    so it must have the form <code class="computeroutput"><span class="special">,</span>
+                    <span class="keyword">public</span> <span class="identifier">my_class</span></code>.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_TRACKING_INIT</span><span class="special">(</span><span class="identifier">args</span><span class="special">)</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    An expression that is used to initialise the tracking mechanism.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_LOCATION</span><span class="special">(</span><span class="identifier">args</span><span class="special">)</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    A variable declaration that is used to define a source code location.
+                    <code class="computeroutput"><span class="identifier">args</span></code> is a parenthesised
+                    function argument list containing the file name, line number,
+                    and function name.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_CREATION</span><span class="special">(</span><span class="identifier">args</span><span class="special">)</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    An expression that is called on creation of an asynchronous operation.
+                    <code class="computeroutput"><span class="identifier">args</span></code> is a parenthesised
+                    function argument list containing the owning execution context,
+                    the tracked handler, the name of the object type, a pointer to
+                    the object, the object's native handle, and the operation name.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_COMPLETION</span><span class="special">(</span><span class="identifier">args</span><span class="special">)</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    An expression that is called on completion of an asynchronous
+                    operation. <code class="computeroutput"><span class="identifier">args</span></code>
+                    is a parenthesised function argument list containing the tracked
+                    handler.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_INVOCATION_BEGIN</span><span class="special">(</span><span class="identifier">args</span><span class="special">)</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    An expression that is called immediately before a completion
+                    handler is invoked. <code class="computeroutput"><span class="identifier">args</span></code>
+                    is a parenthesised function argument list containing the arguments
+                    to the completion handler.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_INVOCATION_END</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    An expression that is called immediately after a completion handler
+                    is invoked.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_OPERATION</span><span class="special">(</span><span class="identifier">args</span><span class="special">)</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    An expression that is called when some synchronous object operation
+                    is called (such as <code class="computeroutput"><span class="identifier">close</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">cancel</span><span class="special">()</span></code>). <code class="computeroutput"><span class="identifier">args</span></code>
+                    is a parenthesised function argument list containing the owning
+                    execution context, the name of the object type, a pointer to
+                    the object, the object's native handle, and the operation name.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_REACTOR_REGISTRATION</span><span class="special">(</span><span class="identifier">args</span><span class="special">)</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    An expression that is called when an object is registered with
+                    the reactor. <code class="computeroutput"><span class="identifier">args</span></code>
+                    is a parenthesised function argument list containing the owning
+                    execution context, the object's native handle, and a unique registration
+                    key.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_REACTOR_DEREGISTRATION</span><span class="special">(</span><span class="identifier">args</span><span class="special">)</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    An expression that is called when an object is deregistered from
+                    the reactor. <code class="computeroutput"><span class="identifier">args</span></code>
+                    is a parenthesised function argument list containing the owning
+                    execution context, the object's native handle, and a unique registration
+                    key.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_REACTOR_READ_EVENT</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    A bitmask constant used to identify reactor read readiness events.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_REACTOR_WRITE_EVENT</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    A bitmask constant used to identify reactor write readiness events.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_REACTOR_ERROR_EVENT</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    A bitmask constant used to identify reactor error readiness events.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_REACTOR_EVENTS</span><span class="special">(</span><span class="identifier">args</span><span class="special">)</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    An expression that is called when an object registered with the
+                    reactor becomes ready. <code class="computeroutput"><span class="identifier">args</span></code>
+                    is a parenthesised function argument list containing the owning
+                    execution context, the unique registration key, and a bitmask
+                    of the ready events.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ASIO_HANDLER_REACTOR_OPERATION</span><span class="special">(</span><span class="identifier">args</span><span class="special">)</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    An expression that is called when the implementation performs
+                    a system call as part of a reactor-based asynchronous operation.
+                    <code class="computeroutput"><span class="identifier">args</span></code> is a parenthesised
+                    function argument list containing the tracked handler, the operation
+                    name, the error code produced by the operation, and (optionally)
+                    the number of bytes transferred.
+                  </p>
+                </td>
+</tr>
+</tbody>
+</table></div>
+<h6>
+<a name="asio.overview.core.handler_tracking.h3"></a>
+          <span><a name="asio.overview.core.handler_tracking.see_also"></a></span><a class="link" href="handler_tracking.html#asio.overview.core.handler_tracking.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../examples/cpp11_examples.html#asio.examples.cpp11_examples.handler_tracking">Handler tracking
+          examples</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cancellation.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="concurrency_hint.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/core/line_based.html

@@ -0,0 +1,155 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Line-Based Operations</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../core.html" title="Core Concepts and Functionality">
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+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="reactor.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="allocation.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.core.line_based"></a><a class="link" href="line_based.html" title="Line-Based Operations">Line-Based Operations</a>
+</h4></div></div></div>
+<p>
+          Many commonly-used internet protocols are line-based, which means that
+          they have protocol elements that are delimited by the character sequence
+          <code class="computeroutput"><span class="string">"\r\n"</span></code>. Examples
+          include HTTP, SMTP and FTP. To more easily permit the implementation of
+          line-based protocols, as well as other protocols that use delimiters, Asio
+          includes the functions <code class="computeroutput"><span class="identifier">read_until</span><span class="special">()</span></code> and <code class="computeroutput"><span class="identifier">async_read_until</span><span class="special">()</span></code>.
+        </p>
+<p>
+          The following example illustrates the use of <code class="computeroutput"><span class="identifier">async_read_until</span><span class="special">()</span></code> in an HTTP server, to receive the first
+          line of an HTTP request from a client:
+        </p>
+<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">http_connection</span>
+<span class="special">{</span>
+  <span class="special">...</span>
+
+  <span class="keyword">void</span> <span class="identifier">start</span><span class="special">()</span>
+  <span class="special">{</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_read_until</span><span class="special">(</span><span class="identifier">socket_</span><span class="special">,</span> <span class="identifier">data_</span><span class="special">,</span> <span class="string">"\r\n"</span><span class="special">,</span>
+        <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">http_connection</span><span class="special">::</span><span class="identifier">handle_request_line</span><span class="special">,</span> <span class="keyword">this</span><span class="special">,</span> <span class="identifier">_1</span><span class="special">));</span>
+  <span class="special">}</span>
+
+  <span class="keyword">void</span> <span class="identifier">handle_request_line</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">ec</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">method</span><span class="special">,</span> <span class="identifier">uri</span><span class="special">,</span> <span class="identifier">version</span><span class="special">;</span>
+      <span class="keyword">char</span> <span class="identifier">sp1</span><span class="special">,</span> <span class="identifier">sp2</span><span class="special">,</span> <span class="identifier">cr</span><span class="special">,</span> <span class="identifier">lf</span><span class="special">;</span>
+      <span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span> <span class="identifier">is</span><span class="special">(&amp;</span><span class="identifier">data_</span><span class="special">);</span>
+      <span class="identifier">is</span><span class="special">.</span><span class="identifier">unsetf</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">skipws</span><span class="special">);</span>
+      <span class="identifier">is</span> <span class="special">&gt;&gt;</span> <span class="identifier">method</span> <span class="special">&gt;&gt;</span> <span class="identifier">sp1</span> <span class="special">&gt;&gt;</span> <span class="identifier">uri</span> <span class="special">&gt;&gt;</span> <span class="identifier">sp2</span> <span class="special">&gt;&gt;</span> <span class="identifier">version</span> <span class="special">&gt;&gt;</span> <span class="identifier">cr</span> <span class="special">&gt;&gt;</span> <span class="identifier">lf</span><span class="special">;</span>
+      <span class="special">...</span>
+    <span class="special">}</span>
+  <span class="special">}</span>
+
+  <span class="special">...</span>
+
+  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket_</span><span class="special">;</span>
+  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">streambuf</span> <span class="identifier">data_</span><span class="special">;</span>
+<span class="special">};</span>
+</pre>
+<p>
+          The <code class="computeroutput"><span class="identifier">streambuf</span></code> data member
+          serves as a place to store the data that has been read from the socket
+          before it is searched for the delimiter. It is important to remember that
+          there may be additional data <span class="emphasis"><em>after</em></span> the delimiter.
+          This surplus data should be left in the <code class="computeroutput"><span class="identifier">streambuf</span></code>
+          so that it may be inspected by a subsequent call to <code class="computeroutput"><span class="identifier">read_until</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">async_read_until</span><span class="special">()</span></code>.
+        </p>
+<p>
+          The delimiters may be specified as a single <code class="computeroutput"><span class="keyword">char</span></code>,
+          a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code> or a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex</span></code>.
+          The <code class="computeroutput"><span class="identifier">read_until</span><span class="special">()</span></code>
+          and <code class="computeroutput"><span class="identifier">async_read_until</span><span class="special">()</span></code>
+          functions also include overloads that accept a user-defined function object
+          called a match condition. For example, to read data into a streambuf until
+          whitespace is encountered:
+        </p>
+<pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffers_iterator</span><span class="special">&lt;</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">streambuf</span><span class="special">::</span><span class="identifier">const_buffers_type</span><span class="special">&gt;</span> <span class="identifier">iterator</span><span class="special">;</span>
+
+<span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="identifier">iterator</span><span class="special">,</span> <span class="keyword">bool</span><span class="special">&gt;</span>
+<span class="identifier">match_whitespace</span><span class="special">(</span><span class="identifier">iterator</span> <span class="identifier">begin</span><span class="special">,</span> <span class="identifier">iterator</span> <span class="identifier">end</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="identifier">iterator</span> <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">begin</span><span class="special">;</span>
+  <span class="keyword">while</span> <span class="special">(</span><span class="identifier">i</span> <span class="special">!=</span> <span class="identifier">end</span><span class="special">)</span>
+    <span class="keyword">if</span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">isspace</span><span class="special">(*</span><span class="identifier">i</span><span class="special">++))</span>
+      <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">make_pair</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="keyword">true</span><span class="special">);</span>
+  <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">make_pair</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="keyword">false</span><span class="special">);</span>
+<span class="special">}</span>
+<span class="special">...</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">streambuf</span> <span class="identifier">b</span><span class="special">;</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">read_until</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">b</span><span class="special">,</span> <span class="identifier">match_whitespace</span><span class="special">);</span>
+</pre>
+<p>
+          To read data into a streambuf until a matching character is found:
+        </p>
+<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">match_char</span>
+<span class="special">{</span>
+<span class="keyword">public</span><span class="special">:</span>
+  <span class="keyword">explicit</span> <span class="identifier">match_char</span><span class="special">(</span><span class="keyword">char</span> <span class="identifier">c</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">c_</span><span class="special">(</span><span class="identifier">c</span><span class="special">)</span> <span class="special">{}</span>
+
+  <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Iterator</span><span class="special">&gt;</span>
+  <span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special">&lt;</span><span class="identifier">Iterator</span><span class="special">,</span> <span class="keyword">bool</span><span class="special">&gt;</span> <span class="keyword">operator</span><span class="special">()(</span>
+      <span class="identifier">Iterator</span> <span class="identifier">begin</span><span class="special">,</span> <span class="identifier">Iterator</span> <span class="identifier">end</span><span class="special">)</span> <span class="keyword">const</span>
+  <span class="special">{</span>
+    <span class="identifier">Iterator</span> <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">begin</span><span class="special">;</span>
+    <span class="keyword">while</span> <span class="special">(</span><span class="identifier">i</span> <span class="special">!=</span> <span class="identifier">end</span><span class="special">)</span>
+      <span class="keyword">if</span> <span class="special">(</span><span class="identifier">c_</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">i</span><span class="special">++)</span>
+        <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">make_pair</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="keyword">true</span><span class="special">);</span>
+    <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">make_pair</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="keyword">false</span><span class="special">);</span>
+  <span class="special">}</span>
+
+<span class="keyword">private</span><span class="special">:</span>
+  <span class="keyword">char</span> <span class="identifier">c_</span><span class="special">;</span>
+<span class="special">};</span>
+
+<span class="keyword">namespace</span> <span class="identifier">asio</span> <span class="special">{</span>
+  <span class="keyword">template</span> <span class="special">&lt;&gt;</span> <span class="keyword">struct</span> <span class="identifier">is_match_condition</span><span class="special">&lt;</span><span class="identifier">match_char</span><span class="special">&gt;</span>
+    <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">true_type</span> <span class="special">{};</span>
+<span class="special">}</span> <span class="comment">// namespace asio</span>
+<span class="special">...</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">streambuf</span> <span class="identifier">b</span><span class="special">;</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">read_until</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">b</span><span class="special">,</span> <span class="identifier">match_char</span><span class="special">(</span><span class="char">'a'</span><span class="special">));</span>
+</pre>
+<p>
+          The <code class="computeroutput"><span class="identifier">is_match_condition</span><span class="special">&lt;&gt;</span></code> type trait automatically evaluates
+          to true for functions, and for function objects with a nested <code class="computeroutput"><span class="identifier">result_type</span></code> typedef. For other types
+          the trait must be explicitly specialised, as shown above.
+        </p>
+<h6>
+<a name="asio.overview.core.line_based.h0"></a>
+          <span><a name="asio.overview.core.line_based.see_also"></a></span><a class="link" href="line_based.html#asio.overview.core.line_based.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/async_read_until.html" title="async_read_until">async_read_until()</a>,
+          <a class="link" href="../../reference/is_match_condition.html" title="is_match_condition">is_match_condition</a>,
+          <a class="link" href="../../reference/read_until.html" title="read_until">read_until()</a>, <a class="link" href="../../reference/streambuf.html" title="streambuf">streambuf</a>,
+          <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.http_client">HTTP client example</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="reactor.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="allocation.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/core/reactor.html

@@ -0,0 +1,76 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Reactor-Style Operations</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../core.html" title="Core Concepts and Functionality">
+<link rel="prev" href="streams.html" title="Streams, Short Reads and Short Writes">
+<link rel="next" href="line_based.html" title="Line-Based Operations">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="streams.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="line_based.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.core.reactor"></a><a class="link" href="reactor.html" title="Reactor-Style Operations">Reactor-Style Operations</a>
+</h4></div></div></div>
+<p>
+          Sometimes a program must be integrated with a third-party library that
+          wants to perform the I/O operations itself. To facilitate this, Asio includes
+          synchronous and asynchronous operations that may be used to wait for a
+          socket to become ready to read, ready to write, or to have a pending error
+          condition.
+        </p>
+<p>
+          As an example, to perform a non-blocking read something like the following
+          may be used:
+        </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="special">...</span>
+<span class="identifier">socket</span><span class="special">.</span><span class="identifier">non_blocking</span><span class="special">(</span><span class="keyword">true</span><span class="special">);</span>
+<span class="special">...</span>
+<span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">::</span><span class="identifier">wait_read</span><span class="special">,</span> <span class="identifier">read_handler</span><span class="special">);</span>
+<span class="special">...</span>
+<span class="keyword">void</span> <span class="identifier">read_handler</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">ec</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">buf</span><span class="special">(</span><span class="identifier">socket</span><span class="special">.</span><span class="identifier">available</span><span class="special">());</span>
+    <span class="identifier">socket</span><span class="special">.</span><span class="identifier">read_some</span><span class="special">(</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">buf</span><span class="special">));</span>
+  <span class="special">}</span>
+<span class="special">}</span>
+</pre>
+<p>
+          These operations are supported for sockets on all platforms, and for the
+          POSIX stream-oriented descriptor classes.
+        </p>
+<h6>
+<a name="asio.overview.core.reactor.h0"></a>
+          <span><a name="asio.overview.core.reactor.see_also"></a></span><a class="link" href="reactor.html#asio.overview.core.reactor.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/basic_socket/wait.html" title="basic_socket::wait">basic_socket::wait()</a>,
+          <a class="link" href="../../reference/basic_socket/async_wait.html" title="basic_socket::async_wait">basic_socket::async_wait()</a>,
+          <a class="link" href="../../reference/basic_socket/non_blocking.html" title="basic_socket::non_blocking">basic_socket::non_blocking()</a>,
+          <a class="link" href="../../reference/basic_socket/native_non_blocking.html" title="basic_socket::native_non_blocking">basic_socket::native_non_blocking()</a>,
+          <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.nonblocking">nonblocking example</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="streams.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="line_based.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/core/strands.html

@@ -0,0 +1,158 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Strands: Use Threads Without Explicit Locking</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../core.html" title="Core Concepts and Functionality">
+<link rel="prev" href="threads.html" title="Threads and Asio">
+<link rel="next" href="buffers.html" title="Buffers">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="threads.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="buffers.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.core.strands"></a><a class="link" href="strands.html" title="Strands: Use Threads Without Explicit Locking">Strands: Use Threads Without
+        Explicit Locking</a>
+</h4></div></div></div>
+<p>
+          A strand is defined as a strictly sequential invocation of event handlers
+          (i.e. no concurrent invocation). Use of strands allows execution of code
+          in a multithreaded program without the need for explicit locking (e.g.
+          using mutexes).
+        </p>
+<p>
+          Strands may be either implicit or explicit, as illustrated by the following
+          alternative approaches:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              Calling io_context::run() from only one thread means all event handlers
+              execute in an implicit strand, due to the io_context's guarantee that
+              handlers are only invoked from inside run().
+            </li>
+<li class="listitem">
+              Where there is a single chain of asynchronous operations associated
+              with a connection (e.g. in a half duplex protocol implementation like
+              HTTP) there is no possibility of concurrent execution of the handlers.
+              This is an implicit strand.
+            </li>
+<li class="listitem">
+              An explicit strand is an instance of <code class="computeroutput"><span class="identifier">strand</span><span class="special">&lt;&gt;</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">strand</span></code>.
+              All event handler function objects need to be bound to the strand using
+              <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">bind_executor</span><span class="special">()</span></code>
+              or otherwise posted/dispatched through the strand object.
+            </li>
+</ul></div>
+<p>
+          In the case of composed asynchronous operations, such as <code class="computeroutput"><span class="identifier">async_read</span><span class="special">()</span></code>
+          or <code class="computeroutput"><span class="identifier">async_read_until</span><span class="special">()</span></code>,
+          if a completion handler goes through a strand, then all intermediate handlers
+          should also go through the same strand. This is needed to ensure thread
+          safe access for any objects that are shared between the caller and the
+          composed operation (in the case of <code class="computeroutput"><span class="identifier">async_read</span><span class="special">()</span></code> it's the socket, which the caller can
+          <code class="computeroutput"><span class="identifier">close</span><span class="special">()</span></code>
+          to cancel the operation).
+        </p>
+<p>
+          To achieve this, all asynchronous operations obtain the handler's associated
+          executor by using the <code class="computeroutput"><span class="identifier">get_associated_executor</span></code>
+          function. For example:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">associated_executor_t</span><span class="special">&lt;</span><span class="identifier">Handler</span><span class="special">&gt;</span> <span class="identifier">a</span> <span class="special">=</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">get_associated_executor</span><span class="special">(</span><span class="identifier">h</span><span class="special">);</span>
+</pre>
+<p>
+          The associated executor must satisfy the Executor requirements. It will
+          be used by the asynchronous operation to submit both intermediate and final
+          handlers for execution.
+        </p>
+<p>
+          The executor may be customised for a particular handler type by specifying
+          a nested type <code class="computeroutput"><span class="identifier">executor_type</span></code>
+          and member function <code class="computeroutput"><span class="identifier">get_executor</span><span class="special">()</span></code>:
+        </p>
+<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">my_handler</span>
+<span class="special">{</span>
+<span class="keyword">public</span><span class="special">:</span>
+  <span class="comment">// Custom implementation of Executor type requirements.</span>
+  <span class="keyword">typedef</span> <span class="identifier">my_executor</span> <span class="identifier">executor_type</span><span class="special">;</span>
+
+  <span class="comment">// Return a custom executor implementation.</span>
+  <span class="identifier">executor_type</span> <span class="identifier">get_executor</span><span class="special">()</span> <span class="keyword">const</span> <span class="keyword">noexcept</span>
+  <span class="special">{</span>
+    <span class="keyword">return</span> <span class="identifier">my_executor</span><span class="special">();</span>
+  <span class="special">}</span>
+
+  <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()()</span> <span class="special">{</span> <span class="special">...</span> <span class="special">}</span>
+<span class="special">};</span>
+</pre>
+<p>
+          In more complex cases, the <code class="computeroutput"><span class="identifier">associated_executor</span></code>
+          template may be partially specialised directly:
+        </p>
+<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">my_handler</span>
+<span class="special">{</span>
+  <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()()</span> <span class="special">{</span> <span class="special">...</span> <span class="special">}</span>
+<span class="special">};</span>
+
+<span class="keyword">namespace</span> <span class="identifier">asio</span> <span class="special">{</span>
+
+  <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Executor</span><span class="special">&gt;</span>
+  <span class="keyword">struct</span> <span class="identifier">associated_executor</span><span class="special">&lt;</span><span class="identifier">my_handler</span><span class="special">,</span> <span class="identifier">Executor</span><span class="special">&gt;</span>
+  <span class="special">{</span>
+    <span class="comment">// Custom implementation of Executor type requirements.</span>
+    <span class="keyword">typedef</span> <span class="identifier">my_executor</span> <span class="identifier">type</span><span class="special">;</span>
+
+    <span class="comment">// Return a custom executor implementation.</span>
+    <span class="keyword">static</span> <span class="identifier">type</span> <span class="identifier">get</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">my_handler</span><span class="special">&amp;,</span>
+        <span class="keyword">const</span> <span class="identifier">Executor</span><span class="special">&amp;</span> <span class="special">=</span> <span class="identifier">Executor</span><span class="special">())</span> <span class="keyword">noexcept</span>
+    <span class="special">{</span>
+      <span class="keyword">return</span> <span class="identifier">my_executor</span><span class="special">();</span>
+    <span class="special">}</span>
+  <span class="special">};</span>
+
+<span class="special">}</span> <span class="comment">// namespace asio</span>
+</pre>
+<p>
+          The <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">bind_executor</span><span class="special">()</span></code>
+          function is a helper to bind a specific executor object, such as a strand,
+          to a completion handler. This binding automatically associates an executor
+          as shown above. For example, to bind a strand to a completion handler we
+          would simply write:
+        </p>
+<pre class="programlisting"><span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">,</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">bind_executor</span><span class="special">(</span><span class="identifier">my_strand</span><span class="special">,</span>
+      <span class="special">[](</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">length</span><span class="special">)</span>
+      <span class="special">{</span>
+        <span class="comment">// ...</span>
+      <span class="special">}));</span>
+</pre>
+<h6>
+<a name="asio.overview.core.strands.h0"></a>
+          <span><a name="asio.overview.core.strands.see_also"></a></span><a class="link" href="strands.html#asio.overview.core.strands.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/associated_executor.html" title="associated_executor">associated_executor</a>,
+          <a class="link" href="../../reference/get_associated_executor.html" title="get_associated_executor">get_associated_executor</a>,
+          <a class="link" href="../../reference/bind_executor.html" title="bind_executor">bind_executor</a>, <a class="link" href="../../reference/strand.html" title="strand">strand</a>, <a class="link" href="../../reference/io_context__strand.html" title="io_context::strand">io_context::strand</a>,
+          <a class="link" href="../../tutorial/tuttimer5.html" title="Timer.5 - Synchronising completion handlers in multithreaded programs">tutorial Timer.5</a>, <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.http_server_3">HTTP server 3 example</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="threads.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="buffers.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/core/streams.html

@@ -0,0 +1,118 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Streams, Short Reads and Short Writes</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../core.html" title="Core Concepts and Functionality">
+<link rel="prev" href="buffers.html" title="Buffers">
+<link rel="next" href="reactor.html" title="Reactor-Style Operations">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="buffers.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="reactor.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.core.streams"></a><a class="link" href="streams.html" title="Streams, Short Reads and Short Writes">Streams, Short Reads and
+        Short Writes</a>
+</h4></div></div></div>
+<p>
+          Many I/O objects in Asio are stream-oriented. This means that:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              There are no message boundaries. The data being transferred is a continuous
+              sequence of bytes.
+            </li>
+<li class="listitem">
+              Read or write operations may transfer fewer bytes than requested. This
+              is referred to as a short read or short write.
+            </li>
+</ul></div>
+<p>
+          Objects that provide stream-oriented I/O model one or more of the following
+          type requirements:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              <code class="computeroutput"><span class="identifier">SyncReadStream</span></code>, where
+              synchronous read operations are performed using a member function called
+              <code class="computeroutput"><span class="identifier">read_some</span><span class="special">()</span></code>.
+            </li>
+<li class="listitem">
+              <code class="computeroutput"><span class="identifier">AsyncReadStream</span></code>, where
+              asynchronous read operations are performed using a member function
+              called <code class="computeroutput"><span class="identifier">async_read_some</span><span class="special">()</span></code>.
+            </li>
+<li class="listitem">
+              <code class="computeroutput"><span class="identifier">SyncWriteStream</span></code>, where
+              synchronous write operations are performed using a member function
+              called <code class="computeroutput"><span class="identifier">write_some</span><span class="special">()</span></code>.
+            </li>
+<li class="listitem">
+              <code class="computeroutput"><span class="identifier">AsyncWriteStream</span></code>, where
+              asynchronous write operations are performed using a member function
+              called <code class="computeroutput"><span class="identifier">async_write_some</span><span class="special">()</span></code>.
+            </li>
+</ul></div>
+<p>
+          Examples of stream-oriented I/O objects include <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span></code>,
+          <code class="computeroutput"><span class="identifier">ssl</span><span class="special">::</span><span class="identifier">stream</span><span class="special">&lt;&gt;</span></code>,
+          <code class="computeroutput"><span class="identifier">posix</span><span class="special">::</span><span class="identifier">stream_descriptor</span></code>, <code class="computeroutput"><span class="identifier">windows</span><span class="special">::</span><span class="identifier">stream_handle</span></code>,
+          etc.
+        </p>
+<p>
+          Programs typically want to transfer an exact number of bytes. When a short
+          read or short write occurs the program must restart the operation, and
+          continue to do so until the required number of bytes has been transferred.
+          Asio provides generic functions that do this automatically: <code class="computeroutput"><span class="identifier">read</span><span class="special">()</span></code>,
+          <code class="computeroutput"><span class="identifier">async_read</span><span class="special">()</span></code>,
+          <code class="computeroutput"><span class="identifier">write</span><span class="special">()</span></code>
+          and <code class="computeroutput"><span class="identifier">async_write</span><span class="special">()</span></code>.
+        </p>
+<h6>
+<a name="asio.overview.core.streams.h0"></a>
+          <span><a name="asio.overview.core.streams.why_eof_is_an_error"></a></span><a class="link" href="streams.html#asio.overview.core.streams.why_eof_is_an_error">Why
+          EOF is an Error</a>
+        </h6>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              The end of a stream can cause <code class="computeroutput"><span class="identifier">read</span></code>,
+              <code class="computeroutput"><span class="identifier">async_read</span></code>, <code class="computeroutput"><span class="identifier">read_until</span></code> or <code class="computeroutput"><span class="identifier">async_read_until</span></code>
+              functions to violate their contract. E.g. a read of N bytes may finish
+              early due to EOF.
+            </li>
+<li class="listitem">
+              An EOF error may be used to distinguish the end of a stream from a
+              successful read of size 0.
+            </li>
+</ul></div>
+<h6>
+<a name="asio.overview.core.streams.h1"></a>
+          <span><a name="asio.overview.core.streams.see_also"></a></span><a class="link" href="streams.html#asio.overview.core.streams.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/async_read.html" title="async_read">async_read()</a>, <a class="link" href="../../reference/async_write.html" title="async_write">async_write()</a>,
+          <a class="link" href="../../reference/read.html" title="read">read()</a>, <a class="link" href="../../reference/write.html" title="write">write()</a>,
+          <a class="link" href="../../reference/AsyncReadStream.html" title="Buffer-oriented asynchronous read stream requirements">AsyncReadStream</a>,
+          <a class="link" href="../../reference/AsyncWriteStream.html" title="Buffer-oriented asynchronous write stream requirements">AsyncWriteStream</a>,
+          <a class="link" href="../../reference/SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>, <a class="link" href="../../reference/SyncWriteStream.html" title="Buffer-oriented synchronous write stream requirements">SyncWriteStream</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="buffers.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="reactor.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/core/threads.html

@@ -0,0 +1,121 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Threads and Asio</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../core.html" title="Core Concepts and Functionality">
+<link rel="prev" href="async.html" title="The Proactor Design Pattern: Concurrency Without Threads">
+<link rel="next" href="strands.html" title="Strands: Use Threads Without Explicit Locking">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="async.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="strands.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.core.threads"></a><a class="link" href="threads.html" title="Threads and Asio">Threads and Asio</a>
+</h4></div></div></div>
+<h6>
+<a name="asio.overview.core.threads.h0"></a>
+          <span><a name="asio.overview.core.threads.thread_safety"></a></span><a class="link" href="threads.html#asio.overview.core.threads.thread_safety">Thread
+          Safety</a>
+        </h6>
+<p>
+          In general, it is safe to make concurrent use of distinct objects, but
+          unsafe to make concurrent use of a single object. However, types such as
+          <code class="computeroutput"><span class="identifier">io_context</span></code> provide a stronger
+          guarantee that it is safe to use a single object concurrently.
+        </p>
+<h6>
+<a name="asio.overview.core.threads.h1"></a>
+          <span><a name="asio.overview.core.threads.thread_pools"></a></span><a class="link" href="threads.html#asio.overview.core.threads.thread_pools">Thread
+          Pools</a>
+        </h6>
+<p>
+          Multiple threads may call <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code> to set up a pool of threads from which
+          completion handlers may be invoked. This approach may also be used with
+          <code class="computeroutput"><span class="identifier">post</span><span class="special">()</span></code>
+          as a means to perform arbitrary computational tasks across a thread pool.
+        </p>
+<p>
+          Note that all threads that have joined an <code class="computeroutput"><span class="identifier">io_context</span></code>'s
+          pool are considered equivalent, and the <code class="computeroutput"><span class="identifier">io_context</span></code>
+          may distribute work across them in an arbitrary fashion.
+        </p>
+<h6>
+<a name="asio.overview.core.threads.h2"></a>
+          <span><a name="asio.overview.core.threads.internal_threads"></a></span><a class="link" href="threads.html#asio.overview.core.threads.internal_threads">Internal
+          Threads</a>
+        </h6>
+<p>
+          The implementation of this library for a particular platform may make use
+          of one or more internal threads to emulate asynchronicity. As far as possible,
+          these threads must be invisible to the library user. In particular, the
+          threads:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              must not call the user's code directly; and
+            </li>
+<li class="listitem">
+              must block all signals.
+            </li>
+</ul></div>
+<p>
+          This approach is complemented by the following guarantee:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+              Asynchronous completion handlers will only be called from threads that
+              are currently calling <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>.
+            </li></ul></div>
+<p>
+          Consequently, it is the library user's responsibility to create and manage
+          all threads to which the notifications will be delivered.
+        </p>
+<p>
+          The reasons for this approach include:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              By only calling <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code> from a single thread, the user's
+              code can avoid the development complexity associated with synchronisation.
+              For example, a library user can implement scalable servers that are
+              single-threaded (from the user's point of view).
+            </li>
+<li class="listitem">
+              A library user may need to perform initialisation in a thread shortly
+              after the thread starts and before any other application code is executed.
+              For example, users of Microsoft's COM must call <code class="computeroutput"><span class="identifier">CoInitializeEx</span></code>
+              before any other COM operations can be called from that thread.
+            </li>
+<li class="listitem">
+              The library interface is decoupled from interfaces for thread creation
+              and management, and permits implementations on platforms where threads
+              are not available.
+            </li>
+</ul></div>
+<h6>
+<a name="asio.overview.core.threads.h3"></a>
+          <span><a name="asio.overview.core.threads.see_also"></a></span><a class="link" href="threads.html#asio.overview.core.threads.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/io_context.html" title="io_context">io_context</a>, <a class="link" href="../../reference/post.html" title="post">post</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="async.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../core.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="strands.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/cpp2011.html

@@ -0,0 +1,59 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>C++ 2011 Support</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="ssl.html" title="SSL">
+<link rel="next" href="cpp2011/system_error.html" title="System Errors and Error Codes">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="ssl.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="cpp2011/system_error.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.cpp2011"></a><a class="link" href="cpp2011.html" title="C++ 2011 Support">C++ 2011 Support</a>
+</h3></div></div></div>
+<p>
+        <a class="link" href="cpp2011/system_error.html" title="System Errors and Error Codes">System Errors and Error
+        Codes</a>
+      </p>
+<p>
+        <a class="link" href="cpp2011/move_objects.html" title="Movable I/O Objects">Movable I/O Objects</a>
+      </p>
+<p>
+        <a class="link" href="cpp2011/move_handlers.html" title="Movable Handlers">Movable Handlers</a>
+      </p>
+<p>
+        <a class="link" href="cpp2011/variadic.html" title="Variadic Templates">Variadic Templates</a>
+      </p>
+<p>
+        <a class="link" href="cpp2011/array.html" title="Array Container">Array Container</a>
+      </p>
+<p>
+        <a class="link" href="cpp2011/atomic.html" title="Atomics">Atomics</a>
+      </p>
+<p>
+        <a class="link" href="cpp2011/shared_ptr.html" title="Shared Pointers">Shared Pointers</a>
+      </p>
+<p>
+        <a class="link" href="cpp2011/chrono.html" title="Chrono">Chrono</a>
+      </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="ssl.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="cpp2011/system_error.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/cpp2011/array.html

@@ -0,0 +1,60 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Array Container</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../cpp2011.html" title="C++ 2011 Support">
+<link rel="prev" href="variadic.html" title="Variadic Templates">
+<link rel="next" href="atomic.html" title="Atomics">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="variadic.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="atomic.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.cpp2011.array"></a><a class="link" href="array.html" title="Array Container">Array Container</a>
+</h4></div></div></div>
+<p>
+          Where the standard library provides <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">array</span><span class="special">&lt;&gt;</span></code>, Asio:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              Provides overloads for the <a class="link" href="../../reference/buffer.html" title="buffer">buffer()</a>
+              function.
+            </li>
+<li class="listitem">
+              Uses it in preference to <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span><span class="special">&lt;&gt;</span></code> for the <a class="link" href="../../reference/ip__address_v4/bytes_type.html" title="ip::address_v4::bytes_type">ip::address_v4::bytes_type</a>
+              and <a class="link" href="../../reference/ip__address_v6/bytes_type.html" title="ip::address_v6::bytes_type">ip::address_v6::bytes_type</a>
+              types.
+            </li>
+<li class="listitem">
+              Uses it in preference to <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span><span class="special">&lt;&gt;</span></code> where a fixed size array type
+              is needed in the implementation.
+            </li>
+</ul></div>
+<p>
+          Support for <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">array</span><span class="special">&lt;&gt;</span></code>
+          is automatically enabled for <code class="literal">g++</code> 4.3 and later, when
+          the <code class="literal">-std=c++0x</code> or <code class="literal">-std=gnu++0x</code> compiler
+          options are used, as well as for Microsoft Visual C++ 10. It may be disabled
+          by defining <code class="computeroutput"><span class="identifier">ASIO_DISABLE_STD_ARRAY</span></code>,
+          or explicitly enabled for other compilers by defining <code class="computeroutput"><span class="identifier">ASIO_HAS_STD_ARRAY</span></code>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="variadic.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="atomic.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/cpp2011/atomic.html

@@ -0,0 +1,44 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Atomics</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../cpp2011.html" title="C++ 2011 Support">
+<link rel="prev" href="array.html" title="Array Container">
+<link rel="next" href="shared_ptr.html" title="Shared Pointers">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="array.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="shared_ptr.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.cpp2011.atomic"></a><a class="link" href="atomic.html" title="Atomics">Atomics</a>
+</h4></div></div></div>
+<p>
+          Asio's implementation can use <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">atomic</span><span class="special">&lt;&gt;</span></code> in preference to <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">detail</span><span class="special">::</span><span class="identifier">atomic_count</span></code>.
+        </p>
+<p>
+          Support for the standard atomic integer template is automatically enabled
+          for <code class="literal">g++</code> 4.5 and later, when the <code class="literal">-std=c++0x</code>
+          or <code class="literal">-std=gnu++0x</code> compiler options are used. It may be
+          disabled by defining <code class="computeroutput"><span class="identifier">ASIO_DISABLE_STD_ATOMIC</span></code>,
+          or explicitly enabled for other compilers by defining <code class="computeroutput"><span class="identifier">ASIO_HAS_STD_ATOMIC</span></code>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="array.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="shared_ptr.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/cpp2011/chrono.html

@@ -0,0 +1,56 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Chrono</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../cpp2011.html" title="C++ 2011 Support">
+<link rel="prev" href="shared_ptr.html" title="Shared Pointers">
+<link rel="next" href="../implementation.html" title="Platform-Specific Implementation Notes">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="shared_ptr.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../implementation.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.cpp2011.chrono"></a><a class="link" href="chrono.html" title="Chrono">Chrono</a>
+</h4></div></div></div>
+<p>
+          Asio provides timers based on the <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span></code>
+          facilities via the <a class="link" href="../../reference/basic_waitable_timer.html" title="basic_waitable_timer">basic_waitable_timer</a>
+          class template. The typedefs <a class="link" href="../../reference/system_timer.html" title="system_timer">system_timer</a>,
+          <a class="link" href="../../reference/steady_timer.html" title="steady_timer">steady_timer</a> and <a class="link" href="../../reference/high_resolution_timer.html" title="high_resolution_timer">high_resolution_timer</a>
+          utilise the standard clocks <code class="computeroutput"><span class="identifier">system_clock</span></code>,
+          <code class="computeroutput"><span class="identifier">steady_clock</span></code> and <code class="computeroutput"><span class="identifier">high_resolution_clock</span></code> respectively.
+        </p>
+<p>
+          Support for the <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span></code> facilities is automatically enabled
+          for <code class="literal">g++</code> 4.6 and later, when the <code class="literal">-std=c++0x</code>
+          or <code class="literal">-std=gnu++0x</code> compiler options are used. (Note that,
+          for <code class="literal">g++</code>, the draft-standard <code class="computeroutput"><span class="identifier">monotonic_clock</span></code>
+          is used in place of <code class="computeroutput"><span class="identifier">steady_clock</span></code>.)
+          Support may be disabled by defining <code class="computeroutput"><span class="identifier">ASIO_DISABLE_STD_CHRONO</span></code>,
+          or explicitly enabled for other compilers by defining <code class="computeroutput"><span class="identifier">ASIO_HAS_STD_CHRONO</span></code>.
+        </p>
+<p>
+          When standard <code class="computeroutput"><span class="identifier">chrono</span></code> is
+          unavailable, Asio will otherwise use the Boost.Chrono library. The <a class="link" href="../../reference/basic_waitable_timer.html" title="basic_waitable_timer">basic_waitable_timer</a>
+          class template may be used with either.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="shared_ptr.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../implementation.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/cpp2011/move_handlers.html

@@ -0,0 +1,77 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Movable Handlers</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../cpp2011.html" title="C++ 2011 Support">
+<link rel="prev" href="move_objects.html" title="Movable I/O Objects">
+<link rel="next" href="variadic.html" title="Variadic Templates">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="move_objects.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="variadic.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.cpp2011.move_handlers"></a><a class="link" href="move_handlers.html" title="Movable Handlers">Movable Handlers</a>
+</h4></div></div></div>
+<p>
+          With C++11 and later, user-defined completion handlers are only required
+          to be move constructible, and are not required to be copy constructible.
+        </p>
+<p>
+          When move support is enabled, asynchronous that are documented as follows:
+        </p>
+<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Handler</span><span class="special">&gt;</span>
+<span class="keyword">void</span> <span class="identifier">async_XYZ</span><span class="special">(...,</span> <span class="identifier">Handler</span> <span class="identifier">handler</span><span class="special">);</span>
+</pre>
+<p>
+          are actually declared as:
+        </p>
+<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Handler</span><span class="special">&gt;</span>
+<span class="keyword">void</span> <span class="identifier">async_XYZ</span><span class="special">(...,</span> <span class="identifier">Handler</span><span class="special">&amp;&amp;</span> <span class="identifier">handler</span><span class="special">);</span>
+</pre>
+<p>
+          The handler argument is perfectly forwarded and the move construction occurs
+          within the body of <code class="computeroutput"><span class="identifier">async_XYZ</span><span class="special">()</span></code>. This ensures that all other function
+          arguments are evaluated prior to the move. This is critical when the other
+          arguments to <code class="computeroutput"><span class="identifier">async_XYZ</span><span class="special">()</span></code> are members of the handler. For example:
+        </p>
+<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">my_operation</span>
+<span class="special">{</span>
+  <span class="identifier">unique_ptr</span><span class="special">&lt;</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&gt;</span> <span class="identifier">socket</span><span class="special">;</span>
+  <span class="identifier">unique_ptr</span><span class="special">&lt;</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">&gt;&gt;</span> <span class="identifier">buffer</span><span class="special">;</span>
+  <span class="special">...</span>
+  <span class="keyword">void</span> <span class="keyword">operator</span><span class="special">(</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">length</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="special">...</span>
+    <span class="identifier">socket</span><span class="special">-&gt;</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(*</span><span class="identifier">buffer</span><span class="special">),</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(*</span><span class="keyword">this</span><span class="special">));</span>
+    <span class="special">...</span>
+  <span class="special">}</span>
+<span class="special">};</span>
+</pre>
+<p>
+          Move support is automatically enabled for <code class="literal">g++</code> 4.5 and
+          later, when the <code class="literal">-std=c++0x</code> or <code class="literal">-std=gnu++0x</code>
+          compiler options are used. It may be disabled by defining <code class="computeroutput"><span class="identifier">ASIO_DISABLE_MOVE</span></code>, or explicitly enabled
+          for other compilers by defining <code class="computeroutput"><span class="identifier">ASIO_HAS_MOVE</span></code>.
+          Note that these macros also affect the availability of <a class="link" href="move_objects.html" title="Movable I/O Objects">movable
+          I/O objects</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="move_objects.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="variadic.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/cpp2011/move_objects.html

@@ -0,0 +1,99 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Movable I/O Objects</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../cpp2011.html" title="C++ 2011 Support">
+<link rel="prev" href="system_error.html" title="System Errors and Error Codes">
+<link rel="next" href="move_handlers.html" title="Movable Handlers">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="system_error.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="move_handlers.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.cpp2011.move_objects"></a><a class="link" href="move_objects.html" title="Movable I/O Objects">Movable I/O Objects</a>
+</h4></div></div></div>
+<p>
+          When move support is available (via rvalue references), Asio allows move
+          construction and assignment of sockets, serial ports, POSIX descriptors
+          and Windows handles.
+        </p>
+<p>
+          Move support allows you to write code like:
+        </p>
+<pre class="programlisting"><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">make_socket</span><span class="special">(</span><span class="identifier">io_context</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">s</span><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
+  <span class="special">...</span>
+  <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">s</span><span class="special">);</span>
+<span class="special">}</span>
+</pre>
+<p>
+          or:
+        </p>
+<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">connection</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">enable_shared_from_this</span><span class="special">&lt;</span><span class="identifier">connection</span><span class="special">&gt;</span>
+<span class="special">{</span>
+<span class="keyword">private</span><span class="special">:</span>
+  <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket_</span><span class="special">;</span>
+  <span class="special">...</span>
+<span class="keyword">public</span><span class="special">:</span>
+  <span class="identifier">connection</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&amp;&amp;</span> <span class="identifier">s</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">socket_</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">s</span><span class="special">))</span> <span class="special">{}</span>
+  <span class="special">...</span>
+<span class="special">};</span>
+
+<span class="special">...</span>
+
+<span class="keyword">class</span> <span class="identifier">server</span>
+<span class="special">{</span>
+<span class="keyword">private</span><span class="special">:</span>
+  <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">acceptor</span> <span class="identifier">acceptor_</span><span class="special">;</span>
+  <span class="special">...</span>
+  <span class="keyword">void</span> <span class="identifier">handle_accept</span><span class="special">(</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">,</span> <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">ec</span><span class="special">)</span>
+      <span class="identifier">std</span><span class="special">::</span><span class="identifier">make_shared</span><span class="special">&lt;</span><span class="identifier">connection</span><span class="special">&gt;(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">socket</span><span class="special">))-&gt;</span><span class="identifier">go</span><span class="special">();</span>
+    <span class="identifier">acceptor_</span><span class="special">.</span><span class="identifier">async_accept</span><span class="special">(...);</span>
+  <span class="special">}</span>
+  <span class="special">...</span>
+<span class="special">};</span>
+</pre>
+<p>
+          as well as:
+        </p>
+<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&gt;</span> <span class="identifier">sockets</span><span class="special">;</span>
+<span class="identifier">sockets</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">(...));</span>
+</pre>
+<p>
+          A word of warning: There is nothing stopping you from moving these objects
+          while there are pending asynchronous operations, but it is unlikely to
+          be a good idea to do so. In particular, composed operations like <a class="link" href="../../reference/async_read.html" title="async_read">async_read()</a> store a reference
+          to the stream object. Moving during the composed operation means that the
+          composed operation may attempt to access a moved-from object.
+        </p>
+<p>
+          Move support is automatically enabled for <code class="literal">g++</code> 4.5 and
+          later, when the <code class="literal">-std=c++0x</code> or <code class="literal">-std=gnu++0x</code>
+          compiler options are used. It may be disabled by defining <code class="computeroutput"><span class="identifier">ASIO_DISABLE_MOVE</span></code>, or explicitly enabled
+          for other compilers by defining <code class="computeroutput"><span class="identifier">ASIO_HAS_MOVE</span></code>.
+          Note that these macros also affect the availability of <a class="link" href="move_handlers.html" title="Movable Handlers">movable
+          handlers</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="system_error.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="move_handlers.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/cpp2011/shared_ptr.html

@@ -0,0 +1,44 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Shared Pointers</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../cpp2011.html" title="C++ 2011 Support">
+<link rel="prev" href="atomic.html" title="Atomics">
+<link rel="next" href="chrono.html" title="Chrono">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="atomic.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="chrono.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.cpp2011.shared_ptr"></a><a class="link" href="shared_ptr.html" title="Shared Pointers">Shared Pointers</a>
+</h4></div></div></div>
+<p>
+          Asio's implementation can use <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">shared_ptr</span><span class="special">&lt;&gt;</span></code> and <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">weak_ptr</span><span class="special">&lt;&gt;</span></code> in preference to the Boost equivalents.
+        </p>
+<p>
+          Support for the standard smart pointers is automatically enabled for <code class="literal">g++</code>
+          4.3 and later, when the <code class="literal">-std=c++0x</code> or <code class="literal">-std=gnu++0x</code>
+          compiler options are used, as well as for Microsoft Visual C++ 10. It may
+          be disabled by defining <code class="computeroutput"><span class="identifier">ASIO_DISABLE_STD_SHARED_PTR</span></code>,
+          or explicitly enabled for other compilers by defining <code class="computeroutput"><span class="identifier">ASIO_HAS_STD_SHARED_PTR</span></code>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="atomic.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="chrono.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/cpp2011/system_error.html

@@ -0,0 +1,48 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>System Errors and Error Codes</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../cpp2011.html" title="C++ 2011 Support">
+<link rel="prev" href="../cpp2011.html" title="C++ 2011 Support">
+<link rel="next" href="move_objects.html" title="Movable I/O Objects">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../cpp2011.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="move_objects.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.cpp2011.system_error"></a><a class="link" href="system_error.html" title="System Errors and Error Codes">System Errors and
+        Error Codes</a>
+</h4></div></div></div>
+<p>
+          When available, Asio can use the <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span></code>
+          and <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">system_error</span></code> classes for reporting errors.
+          In this case, the names <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span></code>
+          and <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">system_error</span></code> will be typedefs for these
+          standard classes.
+        </p>
+<p>
+          System error support is automatically enabled for <code class="literal">g++</code>
+          4.6 and later, when the <code class="literal">-std=c++0x</code> or <code class="literal">-std=gnu++0x</code>
+          compiler options are used. It may be disabled by defining <code class="computeroutput"><span class="identifier">ASIO_DISABLE_STD_SYSTEM_ERROR</span></code>, or explicitly
+          enabled for other compilers by defining <code class="computeroutput"><span class="identifier">ASIO_HAS_STD_SYSTEM_ERROR</span></code>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../cpp2011.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="move_objects.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/cpp2011/variadic.html

@@ -0,0 +1,46 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Variadic Templates</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../cpp2011.html" title="C++ 2011 Support">
+<link rel="prev" href="move_handlers.html" title="Movable Handlers">
+<link rel="next" href="array.html" title="Array Container">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="move_handlers.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="array.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.cpp2011.variadic"></a><a class="link" href="variadic.html" title="Variadic Templates">Variadic Templates</a>
+</h4></div></div></div>
+<p>
+          When supported by a compiler, Asio can use variadic templates to implement
+          the <a class="link" href="../../reference/basic_socket_streambuf/connect.html" title="basic_socket_streambuf::connect">basic_socket_streambuf::connect()</a>
+          and <a class="link" href="../../reference/basic_socket_iostream/connect.html" title="basic_socket_iostream::connect">basic_socket_iostream::connect()</a>
+          functions.
+        </p>
+<p>
+          Support for variadic templates is automatically enabled for <code class="literal">g++</code>
+          4.3 and later, when the <code class="literal">-std=c++0x</code> or <code class="literal">-std=gnu++0x</code>
+          compiler options are used. It may be disabled by defining <code class="computeroutput"><span class="identifier">ASIO_DISABLE_VARIADIC_TEMPLATES</span></code>, or explicitly
+          enabled for other compilers by defining <code class="computeroutput"><span class="identifier">ASIO_HAS_VARIADIC_TEMPLATES</span></code>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="move_handlers.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../cpp2011.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="array.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/files.html

@@ -0,0 +1,85 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Files</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="timers.html" title="Timers">
+<link rel="next" href="pipes.html" title="Pipes">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="timers.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="pipes.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.files"></a><a class="link" href="files.html" title="Files">Files</a>
+</h3></div></div></div>
+<div class="note"><table border="0" summary="Note">
+<tr>
+<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../note.png"></td>
+<th align="left">Note</th>
+</tr>
+<tr><td align="left" valign="top"><p>
+          This feature requires I/O completion ports on Windows, and io_uring on
+          Linux (define <code class="computeroutput"><span class="identifier">ASIO_HAS_IO_URING</span></code>
+          to enable).
+        </p></td></tr>
+</table></div>
+<p>
+        Asio provides support for manipulating stream-oriented and random-access
+        files. For example, to write to a newly created stream-oriented file:
+      </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">stream_file</span> <span class="identifier">file</span><span class="special">(</span>
+    <span class="identifier">my_io_context</span><span class="special">,</span> <span class="string">"/path/to/file"</span><span class="special">,</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">stream_file</span><span class="special">::</span><span class="identifier">write_only</span>
+      <span class="special">|</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">stream_file</span><span class="special">::</span><span class="identifier">create</span>
+      <span class="special">|</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">stream_file</span><span class="special">::</span><span class="identifier">truncate</span><span class="special">);</span>
+
+<span class="identifier">file</span><span class="special">.</span><span class="identifier">async_write_some</span><span class="special">(</span><span class="identifier">my_buffer</span><span class="special">,</span>
+    <span class="special">[](</span><span class="identifier">error_code</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="comment">// ...</span>
+    <span class="special">});</span>
+</pre>
+<p>
+        or to read from a random-access file:
+      </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">random_access_file</span> <span class="identifier">file</span><span class="special">(</span>
+    <span class="identifier">my_io_context</span><span class="special">,</span> <span class="string">"/path/to/file"</span><span class="special">,</span>
+    <span class="identifier">asio</span><span class="special">::</span><span class="identifier">random_access_file</span><span class="special">::</span><span class="identifier">read_only</span><span class="special">);</span>
+
+<span class="identifier">file</span><span class="special">.</span><span class="identifier">async_read_some_at</span><span class="special">(</span><span class="number">1234</span><span class="special">,</span> <span class="identifier">my_buffer</span><span class="special">,</span>
+    <span class="special">[](</span><span class="identifier">error_code</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="comment">// ...</span>
+    <span class="special">});</span>
+</pre>
+<h5>
+<a name="asio.overview.files.h0"></a>
+        <span><a name="asio.overview.files.see_also"></a></span><a class="link" href="files.html#asio.overview.files.see_also">See
+        Also</a>
+      </h5>
+<p>
+        <a class="link" href="../reference/basic_file.html" title="basic_file">basic_file</a>, <a class="link" href="../reference/basic_random_access_file.html" title="basic_random_access_file">basic_random_access_file</a>,
+        <a class="link" href="../reference/basic_stream_file.html" title="basic_stream_file">basic_stream_file</a>,
+        <a class="link" href="../reference/file_base.html" title="file_base">file_base</a>, <a class="link" href="../reference/random_access_file.html" title="random_access_file">random_access_file</a>,
+        <a class="link" href="../reference/stream_file.html" title="stream_file">stream_file</a>.
+      </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="timers.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="pipes.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/implementation.html

@@ -0,0 +1,553 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Platform-Specific Implementation Notes</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="cpp2011/chrono.html" title="Chrono">
+<link rel="next" href="../using.html" title="Using, Building, and Configuring Asio">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cpp2011/chrono.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="../using.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.implementation"></a><a class="link" href="implementation.html" title="Platform-Specific Implementation Notes">Platform-Specific Implementation
+      Notes</a>
+</h3></div></div></div>
+<p>
+        This section lists platform-specific implementation details, such as the
+        default demultiplexing mechanism, the number of threads created internally,
+        and when threads are created.
+      </p>
+<h5>
+<a name="asio.overview.implementation.h0"></a>
+        <span><a name="asio.overview.implementation.linux_kernel_2_4"></a></span><a class="link" href="implementation.html#asio.overview.implementation.linux_kernel_2_4">Linux
+        Kernel 2.4</a>
+      </h5>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            Uses <code class="computeroutput"><span class="identifier">select</span></code> for demultiplexing.
+            This means that the number of file descriptors in the process cannot
+            be permitted to exceed <code class="computeroutput"><span class="identifier">FD_SETSIZE</span></code>.
+          </li></ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Demultiplexing using <code class="computeroutput"><span class="identifier">select</span></code>
+            is performed in one of the threads that calls <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run_one</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll_one</span><span class="special">()</span></code>.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to emulate asynchronous host resolution. This thread is created
+            on the first call to either <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code>.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            At most <code class="computeroutput"><span class="identifier">min</span><span class="special">(</span><span class="number">64</span><span class="special">,</span><span class="identifier">IOV_MAX</span><span class="special">)</span></code> buffers may be transferred in a single
+            operation.
+          </li></ul></div>
+<h5>
+<a name="asio.overview.implementation.h1"></a>
+        <span><a name="asio.overview.implementation.linux_kernel_2_6"></a></span><a class="link" href="implementation.html#asio.overview.implementation.linux_kernel_2_6">Linux
+        Kernel 2.6</a>
+      </h5>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            Uses <code class="computeroutput"><span class="identifier">epoll</span></code> for demultiplexing.
+          </li></ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Demultiplexing using <code class="computeroutput"><span class="identifier">epoll</span></code>
+            is performed in one of the threads that calls <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run_one</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll_one</span><span class="special">()</span></code>.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to emulate asynchronous host resolution. This thread is created
+            on the first call to either <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code>.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            At most <code class="computeroutput"><span class="identifier">min</span><span class="special">(</span><span class="number">64</span><span class="special">,</span><span class="identifier">IOV_MAX</span><span class="special">)</span></code> buffers may be transferred in a single
+            operation.
+          </li></ul></div>
+<h5>
+<a name="asio.overview.implementation.h2"></a>
+        <span><a name="asio.overview.implementation.linux_kernel_5_10"></a></span><a class="link" href="implementation.html#asio.overview.implementation.linux_kernel_5_10">Linux
+        Kernel 5.10</a>
+      </h5>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            If <code class="computeroutput"><span class="identifier">ASIO_HAS_IO_URING</span></code>
+            is defined, uses <code class="computeroutput"><span class="identifier">io_uring</span></code>
+            for file-related asynchonous operations.
+          </li>
+<li class="listitem">
+            Uses <code class="computeroutput"><span class="identifier">epoll</span></code> for demultiplexing
+            other event sources.
+          </li>
+<li class="listitem">
+            Optionally uses <code class="computeroutput"><span class="identifier">io_uring</span></code>
+            for all asynchronous operations if, in addition to <code class="computeroutput"><span class="identifier">ASIO_HAS_IO_URING</span></code>,
+            <code class="computeroutput"><span class="identifier">ASIO_DISABLE_EPOLL</span></code> is
+            defined to disable <code class="computeroutput"><span class="identifier">epoll</span></code>.
+          </li>
+</ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Demultiplexing using <code class="computeroutput"><span class="identifier">epoll</span></code>
+            and <code class="computeroutput"><span class="identifier">io_uring</span></code> is performed
+            in one of the threads that calls <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run_one</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll_one</span><span class="special">()</span></code>.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to emulate asynchronous host resolution. This thread is created
+            on the first call to either <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code>.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            At most <code class="computeroutput"><span class="identifier">min</span><span class="special">(</span><span class="number">64</span><span class="special">,</span><span class="identifier">IOV_MAX</span><span class="special">)</span></code> buffers may be transferred in a single
+            operation.
+          </li></ul></div>
+<h5>
+<a name="asio.overview.implementation.h3"></a>
+        <span><a name="asio.overview.implementation.solaris"></a></span><a class="link" href="implementation.html#asio.overview.implementation.solaris">Solaris</a>
+      </h5>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            Uses <code class="literal">/dev/poll</code> for demultiplexing.
+          </li></ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Demultiplexing using <code class="literal">/dev/poll</code> is performed in one
+            of the threads that calls <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run_one</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll_one</span><span class="special">()</span></code>.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to emulate asynchronous host resolution. This thread is created
+            on the first call to either <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code>.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            At most <code class="computeroutput"><span class="identifier">min</span><span class="special">(</span><span class="number">64</span><span class="special">,</span><span class="identifier">IOV_MAX</span><span class="special">)</span></code> buffers may be transferred in a single
+            operation.
+          </li></ul></div>
+<h5>
+<a name="asio.overview.implementation.h4"></a>
+        <span><a name="asio.overview.implementation.qnx_neutrino"></a></span><a class="link" href="implementation.html#asio.overview.implementation.qnx_neutrino">QNX
+        Neutrino</a>
+      </h5>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            Uses <code class="computeroutput"><span class="identifier">select</span></code> for demultiplexing.
+            This means that the number of file descriptors in the process cannot
+            be permitted to exceed <code class="computeroutput"><span class="identifier">FD_SETSIZE</span></code>.
+          </li></ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Demultiplexing using <code class="computeroutput"><span class="identifier">select</span></code>
+            is performed in one of the threads that calls <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run_one</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll_one</span><span class="special">()</span></code>.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to emulate asynchronous host resolution. This thread is created
+            on the first call to either <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code>.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            At most <code class="computeroutput"><span class="identifier">min</span><span class="special">(</span><span class="number">64</span><span class="special">,</span><span class="identifier">IOV_MAX</span><span class="special">)</span></code> buffers may be transferred in a single
+            operation.
+          </li></ul></div>
+<h5>
+<a name="asio.overview.implementation.h5"></a>
+        <span><a name="asio.overview.implementation.mac_os_x"></a></span><a class="link" href="implementation.html#asio.overview.implementation.mac_os_x">Mac
+        OS X</a>
+      </h5>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            Uses <code class="computeroutput"><span class="identifier">kqueue</span></code> for demultiplexing.
+          </li></ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Demultiplexing using <code class="computeroutput"><span class="identifier">kqueue</span></code>
+            is performed in one of the threads that calls <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run_one</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll_one</span><span class="special">()</span></code>.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to emulate asynchronous host resolution. This thread is created
+            on the first call to either <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code>.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            At most <code class="computeroutput"><span class="identifier">min</span><span class="special">(</span><span class="number">64</span><span class="special">,</span><span class="identifier">IOV_MAX</span><span class="special">)</span></code> buffers may be transferred in a single
+            operation.
+          </li></ul></div>
+<h5>
+<a name="asio.overview.implementation.h6"></a>
+        <span><a name="asio.overview.implementation.freebsd"></a></span><a class="link" href="implementation.html#asio.overview.implementation.freebsd">FreeBSD</a>
+      </h5>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            Uses <code class="computeroutput"><span class="identifier">kqueue</span></code> for demultiplexing.
+          </li></ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Demultiplexing using <code class="computeroutput"><span class="identifier">kqueue</span></code>
+            is performed in one of the threads that calls <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run_one</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll_one</span><span class="special">()</span></code>.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to emulate asynchronous host resolution. This thread is created
+            on the first call to either <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code>.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            At most <code class="computeroutput"><span class="identifier">min</span><span class="special">(</span><span class="number">64</span><span class="special">,</span><span class="identifier">IOV_MAX</span><span class="special">)</span></code> buffers may be transferred in a single
+            operation.
+          </li></ul></div>
+<h5>
+<a name="asio.overview.implementation.h7"></a>
+        <span><a name="asio.overview.implementation.aix"></a></span><a class="link" href="implementation.html#asio.overview.implementation.aix">AIX</a>
+      </h5>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            Uses <code class="computeroutput"><span class="identifier">select</span></code> for demultiplexing.
+            This means that the number of file descriptors in the process cannot
+            be permitted to exceed <code class="computeroutput"><span class="identifier">FD_SETSIZE</span></code>.
+          </li></ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Demultiplexing using <code class="computeroutput"><span class="identifier">select</span></code>
+            is performed in one of the threads that calls <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run_one</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll_one</span><span class="special">()</span></code>.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to emulate asynchronous host resolution. This thread is created
+            on the first call to either <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code>.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            At most <code class="computeroutput"><span class="identifier">min</span><span class="special">(</span><span class="number">64</span><span class="special">,</span><span class="identifier">IOV_MAX</span><span class="special">)</span></code> buffers may be transferred in a single
+            operation.
+          </li></ul></div>
+<h5>
+<a name="asio.overview.implementation.h8"></a>
+        <span><a name="asio.overview.implementation.hp_ux"></a></span><a class="link" href="implementation.html#asio.overview.implementation.hp_ux">HP-UX</a>
+      </h5>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            Uses <code class="computeroutput"><span class="identifier">select</span></code> for demultiplexing.
+            This means that the number of file descriptors in the process cannot
+            be permitted to exceed <code class="computeroutput"><span class="identifier">FD_SETSIZE</span></code>.
+          </li></ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Demultiplexing using <code class="computeroutput"><span class="identifier">select</span></code>
+            is performed in one of the threads that calls <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run_one</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll_one</span><span class="special">()</span></code>.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to emulate asynchronous host resolution. This thread is created
+            on the first call to either <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code>.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            At most <code class="computeroutput"><span class="identifier">min</span><span class="special">(</span><span class="number">64</span><span class="special">,</span><span class="identifier">IOV_MAX</span><span class="special">)</span></code> buffers may be transferred in a single
+            operation.
+          </li></ul></div>
+<h5>
+<a name="asio.overview.implementation.h9"></a>
+        <span><a name="asio.overview.implementation.tru64"></a></span><a class="link" href="implementation.html#asio.overview.implementation.tru64">Tru64</a>
+      </h5>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            Uses <code class="computeroutput"><span class="identifier">select</span></code> for demultiplexing.
+            This means that the number of file descriptors in the process cannot
+            be permitted to exceed <code class="computeroutput"><span class="identifier">FD_SETSIZE</span></code>.
+          </li></ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Demultiplexing using <code class="computeroutput"><span class="identifier">select</span></code>
+            is performed in one of the threads that calls <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run_one</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll_one</span><span class="special">()</span></code>.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to emulate asynchronous host resolution. This thread is created
+            on the first call to either <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code>.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            At most <code class="computeroutput"><span class="identifier">min</span><span class="special">(</span><span class="number">64</span><span class="special">,</span><span class="identifier">IOV_MAX</span><span class="special">)</span></code> buffers may be transferred in a single
+            operation.
+          </li></ul></div>
+<h5>
+<a name="asio.overview.implementation.h10"></a>
+        <span><a name="asio.overview.implementation.windows_95__98_and_me"></a></span><a class="link" href="implementation.html#asio.overview.implementation.windows_95__98_and_me">Windows
+        95, 98 and Me</a>
+      </h5>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            Uses <code class="computeroutput"><span class="identifier">select</span></code> for demultiplexing.
+          </li></ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Demultiplexing using <code class="computeroutput"><span class="identifier">select</span></code>
+            is performed in one of the threads that calls <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run_one</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll_one</span><span class="special">()</span></code>.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to emulate asynchronous host resolution. This thread is created
+            on the first call to either <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code>.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            For sockets, at most 16 buffers may be transferred in a single operation.
+          </li></ul></div>
+<h5>
+<a name="asio.overview.implementation.h11"></a>
+        <span><a name="asio.overview.implementation.windows_nt__2000__xp__2003__vista__7__8__10_and_11"></a></span><a class="link" href="implementation.html#asio.overview.implementation.windows_nt__2000__xp__2003__vista__7__8__10_and_11">Windows
+        NT, 2000, XP, 2003, Vista, 7, 8, 10 and 11</a>
+      </h5>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Uses overlapped I/O and I/O completion ports for all asynchronous socket
+            operations except for asynchronous connect.
+          </li>
+<li class="listitem">
+            Uses <code class="computeroutput"><span class="identifier">select</span></code> for emulating
+            asynchronous connect.
+          </li>
+</ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Demultiplexing using I/O completion ports is performed in all threads
+            that call <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">run_one</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">poll_one</span><span class="special">()</span></code>.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to trigger timers. This thread is created on construction of
+            the first <code class="computeroutput"><span class="identifier">basic_deadline_timer</span></code>
+            or <code class="computeroutput"><span class="identifier">basic_waitable_timer</span></code>
+            objects.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            may be used for <code class="computeroutput"><span class="identifier">select</span></code>
+            demultiplexing. This thread is created on the first call to:
+            <div class="itemizedlist"><ul class="itemizedlist" type="circle">
+<li class="listitem">
+                  A socket <code class="computeroutput"><span class="identifier">async_wait</span><span class="special">()</span></code> function, except when using
+                  <code class="computeroutput"><span class="identifier">wait_read</span></code> on a
+                  stream-oriented socket. (For <code class="computeroutput"><span class="identifier">wait_read</span></code>
+                  on a stream-oriented socket, the overlapped I/O operation <code class="computeroutput"><span class="identifier">WSARecv</span></code> is used and no additional
+                  thread is required.)
+                </li>
+<li class="listitem">
+                  A socket <code class="computeroutput"><span class="identifier">async_connect</span><span class="special">()</span></code> operation, if the overlapped
+                  I/O operation <code class="computeroutput"><span class="identifier">ConnectEx</span></code>
+                  is unavailable. (On recent versions of Windows, <code class="computeroutput"><span class="identifier">ConnectEx</span></code>
+                  is used and no additional thread is required.)
+                </li>
+</ul></div>
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to emulate asynchronous host resolution. This thread is created
+            on the first call to either <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">async_resolve</span><span class="special">()</span></code>.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            For sockets, at most 64 buffers may be transferred in a single operation.
+          </li>
+<li class="listitem">
+            For stream-oriented handles, only one buffer may be transferred in a
+            single operation.
+          </li>
+</ul></div>
+<h5>
+<a name="asio.overview.implementation.h12"></a>
+        <span><a name="asio.overview.implementation.windows_runtime"></a></span><a class="link" href="implementation.html#asio.overview.implementation.windows_runtime">Windows
+        Runtime</a>
+      </h5>
+<p>
+        Asio provides limited support for the Windows Runtime. It requires that the
+        language extensions be enabled. Due to the restricted facilities exposed
+        by the Windows Runtime API, the support comes with the following caveats:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            The core facilities such as the <code class="computeroutput"><span class="identifier">io_context</span></code>,
+            <code class="computeroutput"><span class="identifier">strand</span></code>, buffers, composed
+            operations, timers, etc., should all work as normal.
+          </li>
+<li class="listitem">
+            For sockets, only client-side TCP is supported.
+          </li>
+<li class="listitem">
+            Explicit binding of a client-side TCP socket is not supported.
+          </li>
+<li class="listitem">
+            The <code class="computeroutput"><span class="identifier">cancel</span><span class="special">()</span></code>
+            function is not supported for sockets. Asynchronous operations may only
+            be cancelled by closing the socket.
+          </li>
+<li class="listitem">
+            Operations that use <code class="computeroutput"><span class="identifier">null_buffers</span></code>
+            are not supported.
+          </li>
+<li class="listitem">
+            Only <code class="computeroutput"><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">no_delay</span></code> and <code class="computeroutput"><span class="identifier">socket_base</span><span class="special">::</span><span class="identifier">keep_alive</span></code>
+            options are supported.
+          </li>
+<li class="listitem">
+            Resolvers do not support service names, only numbers. I.e. you must use
+            "80" rather than "http".
+          </li>
+<li class="listitem">
+            Most resolver query flags have no effect.
+          </li>
+</ul></div>
+<p>
+        Demultiplexing mechanism:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            Uses the <code class="computeroutput"><span class="identifier">Windows</span><span class="special">::</span><span class="identifier">Networking</span><span class="special">::</span><span class="identifier">Sockets</span><span class="special">::</span><span class="identifier">StreamSocket</span></code> class to implement asynchronous
+            TCP socket operations.
+          </li></ul></div>
+<p>
+        Threads:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            Event completions are delivered to the Windows thread pool and posted
+            to the <code class="computeroutput"><span class="identifier">io_context</span></code> for
+            the handler to be executed.
+          </li>
+<li class="listitem">
+            An additional thread per <code class="computeroutput"><span class="identifier">io_context</span></code>
+            is used to trigger timers. This thread is created on construction of
+            the first timer objects.
+          </li>
+</ul></div>
+<p>
+        Scatter-Gather:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            For sockets, at most one buffer may be transferred in a single operation.
+          </li></ul></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cpp2011/chrono.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="../using.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/model.html

@@ -0,0 +1,77 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Asynchronous Model</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="basics.html" title="Basic Asio Anatomy">
+<link rel="next" href="model/async_ops.html" title="Asynchronous Operations">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="basics.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="model/async_ops.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.model"></a><a class="link" href="model.html" title="Asynchronous Model">Asynchronous Model</a>
+</h3></div></div></div>
+<p>
+        This section presents a high-level overview of the asynchronous model at
+        the core of the Asio library. This model enshrines asynchronous operations
+        as the fundamental building block of asynchronous composition, but in a way
+        that decouples them from the composition mechanism. The asynchronous operations
+        in Asio support callbacks, futures (both eager and lazy), fibers, coroutines,
+        and approaches yet to be imagined. This allows the application programmer
+        to select an approach based on appropriate trade-offs.
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a class="link" href="model/async_ops.html" title="Asynchronous Operations">Asynchronous Operations</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="model/async_agents.html" title="Asynchronous Agents">Asynchronous Agents</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="model/associators.html" title="Associated Characteristics and Associators">Associated Characteristics
+            and Associators</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="model/child_agents.html" title="Child Agents">Child Agents</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="model/executors.html" title="Executors">Executors</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="model/allocators.html" title="Allocators">Allocators</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="model/cancellation.html" title="Cancellation">Cancellation</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="model/completion_tokens.html" title="Completion Tokens">Completion Tokens</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="model/library_elements.html" title="Supporting Library Elements">Supporting Library
+            Elements</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="model/higher_levels.html" title="Higher Level Abstractions">Higher Level Abstractions</a>
+          </li>
+</ul></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="basics.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="model/async_ops.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/model/allocators.html

@@ -0,0 +1,113 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Allocators</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../model.html" title="Asynchronous Model">
+<link rel="prev" href="executors.html" title="Executors">
+<link rel="next" href="cancellation.html" title="Cancellation">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="executors.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="cancellation.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.model.allocators"></a><a class="link" href="allocators.html" title="Allocators">Allocators</a>
+</h4></div></div></div>
+<p>
+          Every asynchronous agent has an associated <span class="emphasis"><em>allocator</em></span>.
+          An agent's allocator is an interface used by the agent's asynchronous operations
+          to obtain <span class="emphasis"><em>per-operation stable memory</em></span> resources (POSMs).
+          This name reflects the fact that the memory is per-operation because the
+          memory is only retained for the lifetime of that operation, and stable,
+          because the memory is guaranteed to be available at that location throughout
+          the operation.
+        </p>
+<p>
+          Asynchronous operations may utilise POSMs in a number of different ways:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              The operation doesn't require any POSMs. For example, the operation
+              wraps an existing API that performs its own memory management, or is
+              copying the long lived state into existing memory like a circular buffer.
+            </li>
+<li class="listitem">
+              The operation uses a single, fixed-size POSM for as long as the operation
+              is outstanding. For example, the operation stores some state in a linked
+              list.
+            </li>
+<li class="listitem">
+              The operation uses a single, runtime-sized POSM. For example, the operation
+              stores a copy of a user-supplied buffer, or a runtime-sized array of
+              iovec structures.
+            </li>
+<li class="listitem">
+              The operation uses multiple POSMs concurrently. For example, a fixed
+              size POSM for a linked list plus a runtime-sized POSM for a buffer.
+            </li>
+<li class="listitem">
+              The operation uses multiple POSMs serially, which may vary in size.
+            </li>
+</ul></div>
+<p>
+          Associated allocators allow users to treat POSM optimisation as a cross-cutting
+          concern to the composition of asynchronous operations. Furthermore, using
+          allocators as the interface to obtain POSMs grant substantial flexibility
+          to both the implementers and users of asynchronous operations:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              Users can ignore the allocator and accept whatever default strategy
+              is employed by the application.
+            </li>
+<li class="listitem">
+              Implementers can ignore the allocator, especially if the operation
+              is not considered performance-sensitive.
+            </li>
+<li class="listitem">
+              Users can co-locate POSMs for related asynchronous operations, for
+              better locality of reference.
+            </li>
+<li class="listitem">
+              For compositions that involve serial POSMs of different sizes, memory
+              usage need only be as great as the currently extant POSM. For example,
+              consider a composition that contains a short-lived operation that uses
+              large POSMs (connection establishment and handshake) followed by a
+              long-lived operation that uses small POSMs (transferring data to and
+              from the peer).
+            </li>
+</ul></div>
+<p>
+          As noted previously, all resources must be released prior to calling the
+          completion handler. This enables memory to be recycled for subsequent asynchronous
+          operations within an agent. This allows applications with long-lived asynchronous
+          agents to have no hot-path memory allocations, even though the user code
+          is unaware of associated allocators.
+        </p>
+<h6>
+<a name="asio.overview.model.allocators.h0"></a>
+          <span><a name="asio.overview.model.allocators.see_also"></a></span><a class="link" href="allocators.html#asio.overview.model.allocators.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../core/allocation.html" title="Custom Memory Allocation">Custom Memory Allocation</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="executors.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="cancellation.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/model/associators.html

@@ -0,0 +1,150 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Associated Characteristics and Associators</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../model.html" title="Asynchronous Model">
+<link rel="prev" href="async_agents.html" title="Asynchronous Agents">
+<link rel="next" href="child_agents.html" title="Child Agents">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="async_agents.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="child_agents.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.model.associators"></a><a class="link" href="associators.html" title="Associated Characteristics and Associators">Associated Characteristics
+        and Associators</a>
+</h4></div></div></div>
+<p>
+          An asynchronous agent has <span class="emphasis"><em>associated characteristics</em></span>
+          that specify how asynchronous operations should behave when composed as
+          part of that agent, such as:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              An allocator, which determines how the agent's asynchronous operations
+              obtain memory resources.
+            </li>
+<li class="listitem">
+              A cancellation slot, which determines how the agent's asynchronous
+              operations support cancellation.
+            </li>
+<li class="listitem">
+              An executor, which determines how the agent's completion handlers will
+              be queued and run.
+            </li>
+</ul></div>
+<p>
+          When an asynchronous operation is run within an asynchronous agent, its
+          implementation may query these associated characteristics and use them
+          to satisfy the requirements or preferences they represent. The asynchronous
+          operation performs these queries by applying <span class="emphasis"><em>associator</em></span>
+          traits to the completion handler. Each characteristic has a corresponding
+          associator trait.
+        </p>
+<p>
+          An associator trait may be specialised for concrete completion handler
+          types to:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              accept the default characteristic supplied by the asynchronous operation,
+              returning this default as-is
+            </li>
+<li class="listitem">
+              return an unrelated implementation of the characteristic, or
+            </li>
+<li class="listitem">
+              adapt the supplied default to introduce additional behaviour required
+              by the completion handler.
+            </li>
+</ul></div>
+<h6>
+<a name="asio.overview.model.associators.h0"></a>
+          <span><a name="asio.overview.model.associators.specification_of_an_associator"></a></span><a class="link" href="associators.html#asio.overview.model.associators.specification_of_an_associator">Specification
+          of an Associator</a>
+        </h6>
+<p>
+          Given an associator trait named<sup>[<a name="asio.overview.model.associators.f0" href="#ftn.asio.overview.model.associators.f0" class="footnote">2</a>]</sup> <code class="computeroutput"><span class="identifier">associated_R</span></code>,
+          having:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              a source value <code class="computeroutput"><span class="identifier">s</span></code> of
+              type <code class="computeroutput"><span class="identifier">S</span></code>, in this case
+              the completion handler and its type,
+            </li>
+<li class="listitem">
+              a set of type requirements (or a concept) <code class="computeroutput"><span class="identifier">R</span></code>
+              that define the syntactic and semantic requirements of the associated
+              characteristic, and
+            </li>
+<li class="listitem">
+              a candidate value <code class="computeroutput"><span class="identifier">c</span></code>
+              of type <code class="computeroutput"><span class="identifier">C</span></code> that meets
+              the type requirements <code class="computeroutput"><span class="identifier">R</span></code>,
+              which represents a default implementation of the associated characteristic,
+              supplied by the asynchronous operation
+            </li>
+</ul></div>
+<p>
+          the asynchronous operation uses the associator trait to compute:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              the type <code class="computeroutput"><span class="identifier">associated_R</span><span class="special">&lt;</span><span class="identifier">S</span><span class="special">,</span> <span class="identifier">C</span><span class="special">&gt;::</span><span class="identifier">type</span></code>,
+              and
+            </li>
+<li class="listitem">
+              the value <code class="computeroutput"><span class="identifier">associated_R</span><span class="special">&lt;</span><span class="identifier">S</span><span class="special">,</span> <span class="identifier">C</span><span class="special">&gt;::</span><span class="identifier">get</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">c</span><span class="special">)</span></code>
+            </li>
+</ul></div>
+<p>
+          that meet the requirements defined in <code class="computeroutput"><span class="identifier">R</span></code>.
+          For convenience, these are also accessible via type alias <code class="computeroutput"><span class="identifier">associated_R_t</span><span class="special">&lt;</span><span class="identifier">S</span><span class="special">,</span> <span class="identifier">C</span><span class="special">&gt;</span></code> and free function <code class="computeroutput"><span class="identifier">get_associated_R</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span>
+          <span class="identifier">c</span><span class="special">)</span></code>,
+          respectively.
+        </p>
+<p>
+          The trait's primary template is specified such that:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              if <code class="computeroutput"><span class="identifier">S</span><span class="special">::</span><span class="identifier">R_type</span></code> is well-formed, defines a
+              nested type alias type as <code class="computeroutput"><span class="identifier">S</span><span class="special">::</span><span class="identifier">R_type</span></code>,
+              and a static member function get that returns <code class="computeroutput"><span class="identifier">s</span><span class="special">.</span><span class="identifier">get_R</span><span class="special">()</span></code>
+            </li>
+<li class="listitem">
+              otherwise, if <code class="computeroutput"><span class="identifier">associator</span><span class="special">&lt;</span><span class="identifier">associated_R</span><span class="special">,</span> <span class="identifier">S</span><span class="special">,</span> <span class="identifier">C</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
+              is well-formed and denotes a type, inherits from <code class="computeroutput"><span class="identifier">associator</span><span class="special">&lt;</span><span class="identifier">associated_R</span><span class="special">,</span> <span class="identifier">S</span><span class="special">,</span> <span class="identifier">C</span><span class="special">&gt;</span></code>
+            </li>
+<li class="listitem">
+              otherwise, defines a nested type alias type as <code class="computeroutput"><span class="identifier">C</span></code>,
+              and a static member function get that returns <code class="computeroutput"><span class="identifier">c</span></code>.
+            </li>
+</ul></div>
+<div class="footnotes">
+<br><hr width="100" align="left">
+<div class="footnote"><p><sup>[<a name="ftn.asio.overview.model.associators.f0" href="#asio.overview.model.associators.f0" class="para">2</a>] </sup>
+            The associator traits are named <a class="link" href="../../reference/associated_allocator.html" title="associated_allocator"><code class="computeroutput"><span class="identifier">associated_allocator</span></code></a>, <a class="link" href="../../reference/associated_executor.html" title="associated_executor"><code class="computeroutput"><span class="identifier">associated_executor</span></code></a>,
+            and <a class="link" href="../../reference/associated_cancellation_slot.html" title="associated_cancellation_slot"><code class="computeroutput"><span class="identifier">associated_cancellation_slot</span></code></a>.
+          </p></div>
+</div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="async_agents.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="child_agents.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/model/async_agents.html

@@ -0,0 +1,69 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Asynchronous Agents</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../model.html" title="Asynchronous Model">
+<link rel="prev" href="async_ops.html" title="Asynchronous Operations">
+<link rel="next" href="associators.html" title="Associated Characteristics and Associators">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="async_ops.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="associators.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.model.async_agents"></a><a class="link" href="async_agents.html" title="Asynchronous Agents">Asynchronous Agents</a>
+</h4></div></div></div>
+<p>
+          <span class="inlinemediaobject"><img src="../../../async_agent_model.png" width="931"></span>
+        </p>
+<p>
+          An <span class="emphasis"><em>asynchronous agent</em></span> is a sequential composition
+          of asynchronous operations. Every asynchronous operation is considered
+          to run as a part of an asynchronous agent, even if that agent contains
+          only that single operation. An asynchronous agent is an entity that may
+          perform work concurrently with other agents. Asynchronous agents are to
+          asynchronous operations as threads are to synchronous operations.
+        </p>
+<p>
+          However, an asynchronous agent is a purely notional construct that allows
+          us to reason about the context for, and composition of, asynchronous operations
+          in a program. The name “asynchronous agent” does not appear in the
+          library, nor is it important which concrete mechanism<sup>[<a name="asio.overview.model.async_agents.f0" href="#ftn.asio.overview.model.async_agents.f0" class="footnote">1</a>]</sup> is used to compose the asynchronous operations in an agent.
+        </p>
+<p>
+          We can visualise an asynchronous agent as follows:
+        </p>
+<p>
+          <span class="inlinemediaobject"><img src="../../../async_agent_chain.png" width="738"></span>
+        </p>
+<p>
+          Asynchronous agents alternately wait for an asynchronous operation to complete,
+          and then run a completion handler for that operation. Within the context
+          of an agent, these completion handlers represent indivisible units of schedulable
+          work.
+        </p>
+<div class="footnotes">
+<br><hr width="100" align="left">
+<div class="footnote"><p><sup>[<a name="ftn.asio.overview.model.async_agents.f0" href="#asio.overview.model.async_agents.f0" class="para">1</a>] </sup>
+            Such as chains of lambdas, coroutines, fibers, state machines, etc.
+          </p></div>
+</div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="async_ops.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="associators.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/model/async_ops.html

@@ -0,0 +1,139 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Asynchronous Operations</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../model.html" title="Asynchronous Model">
+<link rel="prev" href="../model.html" title="Asynchronous Model">
+<link rel="next" href="async_agents.html" title="Asynchronous Agents">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../model.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="async_agents.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.model.async_ops"></a><a class="link" href="async_ops.html" title="Asynchronous Operations">Asynchronous Operations</a>
+</h4></div></div></div>
+<p>
+          <span class="inlinemediaobject"><img src="../../../async_op_model.png" width="421"></span>
+        </p>
+<p>
+          An <span class="emphasis"><em>asynchronous operation</em></span> is the basic unit of composition
+          in the Asio asynchronous model. Asynchronous operations represent work
+          that is launched and performed in the background, while the user's code
+          that initiated the work can continue with other things.
+        </p>
+<p>
+          Conceptually, the lifecycle of an asynchronous operation can be described
+          in terms of the following events and phases:
+        </p>
+<p>
+          <span class="inlinemediaobject"><img src="../../../async_op_phases.png" width="861"></span>
+        </p>
+<p>
+          An <span class="emphasis"><em>initiating function</em></span> is a function which may be
+          called by the user to start an asynchronous operation.
+        </p>
+<p>
+          A <span class="emphasis"><em>completion handler</em></span> is a user-provided, move-only
+          function object that will be invoked, at most once, with the result of
+          the asynchronous operation. The invocation of the completion handler tells
+          the user about something that has already happened: the operation completed,
+          and the side effects of the operation were established.
+        </p>
+<p>
+          The initiating function and completion handler are incorporated into the
+          user's code as follows:
+        </p>
+<p>
+          <span class="inlinemediaobject"><img src="../../../async_op_init_complete.png" width="496"></span>
+        </p>
+<p>
+          Synchronous operations, being embodied as single functions, have several
+          inherent semantic properties as a consequence. Asynchronous operations
+          adopt some of these semantic properties from their synchronous counterparts,
+          in order to facilitate flexible and efficient composition.
+        </p>
+<div class="informaltable"><table class="table">
+<colgroup>
+<col>
+<col>
+</colgroup>
+<thead><tr>
+<th>
+                  <p>
+                    Property of synchronous operations
+                  </p>
+                </th>
+<th>
+                  <p>
+                    Equivalent property of asynchronous operations
+                  </p>
+                </th>
+</tr></thead>
+<tbody>
+<tr>
+<td>
+                  <p>
+                    When a synchronous operation is generic (i.e. a template) the
+                    return type is deterministically derived from the function and
+                    its arguments.
+                  </p>
+                </td>
+<td>
+                  <p>
+                    When an asynchronous operation is generic, the completion handler's
+                    arguments' types and order are deterministically derived from
+                    the initiating function and its arguments.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    If a synchronous operation requires a temporary resource (such
+                    as memory, a file descriptor, or a thread), this resource is
+                    released before returning from the function.
+                  </p>
+                </td>
+<td>
+                  <p>
+                    If an asynchronous operation requires a temporary resource (such
+                    as memory, a file descriptor, or a thread), this resource is
+                    released before calling the completion handler.
+                  </p>
+                </td>
+</tr>
+</tbody>
+</table></div>
+<p>
+          The latter is an important property of asynchronous operations, in that
+          it allows a completion handler to initiate further asynchronous operations
+          without overlapping resource usage. Consider the trivial (and relatively
+          common) case of the same operation being repeated over and over in a chain:
+        </p>
+<p>
+          <span class="inlinemediaobject"><img src="../../../async_op_trivial_chain.png" width="375"></span>
+        </p>
+<p>
+          By ensuring that resources are released before the completion handler runs,
+          we avoid doubling the peak resource usage of the chain of operations.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../model.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="async_agents.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/model/cancellation.html

@@ -0,0 +1,64 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Cancellation</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../model.html" title="Asynchronous Model">
+<link rel="prev" href="allocators.html" title="Allocators">
+<link rel="next" href="completion_tokens.html" title="Completion Tokens">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="allocators.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="completion_tokens.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.model.cancellation"></a><a class="link" href="cancellation.html" title="Cancellation">Cancellation</a>
+</h4></div></div></div>
+<p>
+          In Asio, many objects, such as sockets and timers, support object-wide
+          cancellation of outstanding asynchronous operations via their close or
+          cancel member functions. However, certain asynchronous operations also
+          support individual, targeted cancellation. This per-operation cancellation
+          is enabled by specifying that every asynchronous agent has an associated
+          <span class="emphasis"><em>cancellation slot</em></span>.
+        </p>
+<p>
+          To support cancellation, an asynchronous operation installs a cancellation
+          handler into the agent's slot. The cancellation handler is a function object
+          that will be invoked when a cancellation signal is emitted by the user
+          into the slot. Since a cancellation slot is associated with a single agent,
+          the slot holds at most one handler at a time, and installing a new handler
+          will overwrite any previously installed handler. Thus, the same slot is
+          reused for subsequent asynchronous operations within the agent.
+        </p>
+<p>
+          Cancellation is particularly useful when an asynchronous operation contains
+          multiple child agents. For example, one child agent may be complete and
+          the other is then cancelled, as its side effects are no longer required.
+        </p>
+<h6>
+<a name="asio.overview.model.cancellation.h0"></a>
+          <span><a name="asio.overview.model.cancellation.see_also"></a></span><a class="link" href="cancellation.html#asio.overview.model.cancellation.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../core/cancellation.html" title="Per-Operation Cancellation">Per-Operation Cancellation</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="allocators.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="completion_tokens.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/model/child_agents.html

@@ -0,0 +1,108 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Child Agents</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../model.html" title="Asynchronous Model">
+<link rel="prev" href="associators.html" title="Associated Characteristics and Associators">
+<link rel="next" href="executors.html" title="Executors">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="associators.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="executors.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.model.child_agents"></a><a class="link" href="child_agents.html" title="Child Agents">Child Agents</a>
+</h4></div></div></div>
+<p>
+          The asynchronous operations within an agent may themselves be implemented
+          in terms of child agents.<sup>[<a name="asio.overview.model.child_agents.f0" href="#ftn.asio.overview.model.child_agents.f0" class="footnote">3</a>]</sup> As far as the parent agent is concerned, it is waiting for
+          the completion of a single asynchronous operation. The asynchronous operations
+          that constitute the child agent run in sequence, and when the final completion
+          handler runs the parent agent is resumed.
+        </p>
+<p>
+          <span class="inlinemediaobject"><img src="../../../async_child_agent_chain.png" width="802"></span>
+        </p>
+<p>
+          As with individual asynchronous operations, the asynchronous operations
+          built on child agents must release their temporary resources prior to calling
+          the completion handler. We may also think of these child agents as resources
+          that end their lifetimes before the completion handler is invoked.
+        </p>
+<p>
+          When an asynchronous operation creates a child agent, it may propagate<sup>[<a name="asio.overview.model.child_agents.f1" href="#ftn.asio.overview.model.child_agents.f1" class="footnote">4</a>]</sup> the associated characteristics of the parent agent to the child
+          agent. These associated characteristics may then be recursively propagated
+          through further layers of asynchronous operations and child agents. This
+          stacking of asynchronous operations replicates another property of synchronous
+          operations.
+        </p>
+<div class="informaltable"><table class="table">
+<colgroup>
+<col>
+<col>
+</colgroup>
+<thead><tr>
+<th>
+                  <p>
+                    Property of synchronous operations
+                  </p>
+                </th>
+<th>
+                  <p>
+                    Equivalent property of asynchronous operations
+                  </p>
+                </th>
+</tr></thead>
+<tbody><tr>
+<td>
+                  <p>
+                    Compositions of synchronous operations may be refactored to use
+                    child functions that run on the same thread (i.e. are simply
+                    called) without altering functionality.
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Asynchronous agents may be refactored to use asynchronous operations
+                    and child agents that share the associated characteristics of
+                    the parent agent, without altering functionality.
+                  </p>
+                </td>
+</tr></tbody>
+</table></div>
+<p>
+          Finally, some asynchronous operations may be implemented in terms of multiple
+          child agents that run concurrently. In this case, the asynchronous operation
+          may choose to selectively propagate the associated characteristics of the
+          parent agent.
+        </p>
+<div class="footnotes">
+<br><hr width="100" align="left">
+<div class="footnote"><p><sup>[<a name="ftn.asio.overview.model.child_agents.f0" href="#asio.overview.model.child_agents.f0" class="para">3</a>] </sup>
+            In Asio these asynchronous operations are referred to as <span class="emphasis"><em>composed
+            operations</em></span>.
+          </p></div>
+<div class="footnote"><p><sup>[<a name="ftn.asio.overview.model.child_agents.f1" href="#asio.overview.model.child_agents.f1" class="para">4</a>] </sup>
+            Typically, by specialising the associator trait and forwarding to the
+            outer completion handler.
+          </p></div>
+</div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="associators.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="executors.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/model/completion_tokens.html

@@ -0,0 +1,325 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Completion Tokens</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../model.html" title="Asynchronous Model">
+<link rel="prev" href="cancellation.html" title="Cancellation">
+<link rel="next" href="library_elements.html" title="Supporting Library Elements">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="cancellation.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="library_elements.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.model.completion_tokens"></a><a class="link" href="completion_tokens.html" title="Completion Tokens">Completion Tokens</a>
+</h4></div></div></div>
+<p>
+          <span class="inlinemediaobject"><img src="../../../completion_token_model.png" width="436"></span>
+        </p>
+<p>
+          A key goal of Asio's asynchronous model is to support multiple composition
+          mechanisms. This is achieved via a <span class="emphasis"><em>completion token</em></span>,
+          which the user passes to an asynchronous operation's initiating function
+          to customise the API surface of the library. By convention, the completion
+          token is the final argument to an asynchronous operation's initiating function.
+        </p>
+<p>
+          For example, if the user passes a lambda (or other function object) as
+          the completion token, the asynchronous operation behaves as previously
+          described: the operation begins, and when the operation completes the result
+          is passed to the lambda.
+        </p>
+<pre class="programlisting"><span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">buffer</span><span class="special">,</span>
+    <span class="special">[](</span><span class="identifier">error_code</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">size_t</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="comment">// ...</span>
+    <span class="special">}</span>
+  <span class="special">);</span>
+</pre>
+<p>
+          When the user passes the <a class="link" href="../../reference/use_future.html" title="use_future">use_future</a>
+          completion token, the operation behaves as though implemented in terms
+          of a <code class="computeroutput"><span class="identifier">promise</span></code> and <code class="computeroutput"><span class="identifier">future</span></code> pair. The initiating function
+          does not just launch the operation, but also returns a future that may
+          be used to await the result.
+        </p>
+<pre class="programlisting"><span class="identifier">future</span><span class="special">&lt;</span><span class="identifier">size_t</span><span class="special">&gt;</span> <span class="identifier">f</span> <span class="special">=</span>
+  <span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span>
+      <span class="identifier">buffer</span><span class="special">,</span> <span class="identifier">use_future</span>
+    <span class="special">);</span>
+<span class="comment">// ...</span>
+<span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">f</span><span class="special">.</span><span class="identifier">get</span><span class="special">();</span>
+</pre>
+<p>
+          Similarly, when the user passes the <a class="link" href="../../reference/use_awaitable.html" title="use_awaitable">use_awaitable</a>
+          completion token, the initiating function behaves as though it is an <code class="computeroutput"><span class="identifier">awaitable</span></code>-based coroutine <sup>[<a name="asio.overview.model.completion_tokens.f0" href="#ftn.asio.overview.model.completion_tokens.f0" class="footnote">6</a>]</sup>. However, in this case the initiating function does not launch
+          the asynchronous operation directly. It only returns the <code class="computeroutput"><span class="identifier">awaitable</span></code>, which in turn launches the
+          operation when it is co_await-ed.
+        </p>
+<pre class="programlisting"><span class="identifier">awaitable</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="identifier">foo</span><span class="special">()</span>
+<span class="special">{</span>
+  <span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span>
+    <span class="identifier">co_await</span> <span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span>
+        <span class="identifier">buffer</span><span class="special">,</span> <span class="identifier">use_awaitable</span>
+      <span class="special">);</span>
+
+  <span class="comment">// ...</span>
+<span class="special">}</span>
+</pre>
+<p>
+          Finally, the <a class="link" href="../../reference/yield_context.html" title="yield_context">yield_context</a>
+          completion token causes the initiating function to behave as a synchronous
+          operation within the context of a stackful coroutine. It not only begins
+          the asynchronous operation, but blocks the stackful coroutine until it
+          is complete. From the point of the stackful coroutine, it is a synchronous
+          operation.
+        </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">foo</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">yield_context</span> <span class="identifier">yield</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">buffer</span><span class="special">,</span> <span class="identifier">yield</span><span class="special">);</span>
+
+  <span class="comment">// ...</span>
+<span class="special">}</span>
+</pre>
+<p>
+          All of these uses are supported by a single implementation of the <code class="computeroutput"><span class="identifier">async_read_some</span></code> initiating function.
+        </p>
+<p>
+          To achieve this, an asynchronous operation must first specify a <span class="emphasis"><em>completion
+          signature</em></span> (or, possibly, signatures) that describes the arguments
+          that will be passed to its completion handler.
+        </p>
+<p>
+          Then, the operation's initiating function takes the completion signature,
+          completion token, and its internal implementation and passes them to the
+          <span class="emphasis"><em>async_result</em></span> trait. The <code class="computeroutput"><span class="identifier">async_result</span></code>
+          trait is a customisation point that combines these to first produce a concrete
+          completion handler, and then launch the operation.
+        </p>
+<p>
+          <span class="inlinemediaobject"><img src="../../../completion_token_transform.png" width="856"></span>
+        </p>
+<p>
+          To see this in practice, let's use a detached thread to adapt a synchronous
+          operation into an asynchronous one:<sup>[<a name="asio.overview.model.completion_tokens.f1" href="#ftn.asio.overview.model.completion_tokens.f1" class="footnote">7</a>]</sup>
+        </p>
+<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span>
+    <span class="identifier">completion_token_for</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">(</span><span class="identifier">error_code</span><span class="special">,</span> <span class="identifier">size_t</span><span class="special">)&gt;</span> <a class="co" name="asio.overview.model.completion_tokens.c0" href="completion_tokens.html#asio.overview.model.completion_tokens.c1"><img src="../../../1.png" alt="1" border="0"></a>
+      <span class="identifier">CompletionToken</span><span class="special">&gt;</span>
+<span class="keyword">auto</span> <span class="identifier">async_read_some</span><span class="special">(</span>
+    <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">,</span>
+    <span class="keyword">const</span> <span class="identifier">mutable_buffer</span><span class="special">&amp;</span> <span class="identifier">b</span><span class="special">,</span>
+    <span class="identifier">CompletionToken</span><span class="special">&amp;&amp;</span> <span class="identifier">token</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">auto</span> <span class="identifier">init</span> <span class="special">=</span> <span class="special">[](</span> <a class="co" name="asio.overview.model.completion_tokens.c2" href="completion_tokens.html#asio.overview.model.completion_tokens.c3"><img src="../../../2.png" alt="2" border="0"></a>
+      <span class="keyword">auto</span> <span class="identifier">completion_handler</span><span class="special">,</span>
+      <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">*</span> <span class="identifier">s</span><span class="special">,</span>
+      <span class="keyword">const</span> <span class="identifier">mutable_buffer</span><span class="special">&amp;</span> <span class="identifier">b</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="identifier">std</span><span class="special">::</span><span class="identifier">thread</span><span class="special">(</span> <a class="co" name="asio.overview.model.completion_tokens.c4" href="completion_tokens.html#asio.overview.model.completion_tokens.c5"><img src="../../../3.png" alt="3" border="0"></a>
+        <span class="special">[](</span>
+            <span class="keyword">auto</span> <span class="identifier">completion_handler</span><span class="special">,</span>
+            <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">*</span> <span class="identifier">s</span><span class="special">,</span>
+            <span class="keyword">const</span> <span class="identifier">mutable_buffer</span><span class="special">&amp;</span> <span class="identifier">b</span>
+          <span class="special">)</span>
+        <span class="special">{</span>
+          <span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">;</span>
+          <span class="identifier">size_t</span> <span class="identifier">n</span> <span class="special">=</span> <span class="identifier">s</span><span class="special">-&gt;</span><span class="identifier">read_some</span><span class="special">(</span><span class="identifier">b</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span>
+          <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">completion_handler</span><span class="special">)(</span><span class="identifier">ec</span><span class="special">,</span> <span class="identifier">n</span><span class="special">);</span> <a class="co" name="asio.overview.model.completion_tokens.c6" href="completion_tokens.html#asio.overview.model.completion_tokens.c7"><img src="../../../4.png" alt="4" border="0"></a>
+        <span class="special">},</span>
+        <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">completion_handler</span><span class="special">),</span>
+        <span class="identifier">s</span><span class="special">,</span>
+        <span class="identifier">b</span>
+      <span class="special">).</span><span class="identifier">detach</span><span class="special">();</span>
+  <span class="special">};</span>
+
+  <span class="keyword">return</span> <span class="identifier">async_result</span><span class="special">&lt;</span> <a class="co" name="asio.overview.model.completion_tokens.c8" href="completion_tokens.html#asio.overview.model.completion_tokens.c9"><img src="../../../5.png" alt="5" border="0"></a>
+      <span class="identifier">decay_t</span><span class="special">&lt;</span><span class="identifier">CompletionToken</span><span class="special">&gt;,</span>
+      <span class="keyword">void</span><span class="special">(</span><span class="identifier">error_code</span><span class="special">,</span> <span class="identifier">size_t</span><span class="special">)</span>
+    <span class="special">&gt;::</span><span class="identifier">initiate</span><span class="special">(</span>
+        <span class="identifier">init</span><span class="special">,</span> <a class="co" name="asio.overview.model.completion_tokens.c10" href="completion_tokens.html#asio.overview.model.completion_tokens.c11"><img src="../../../6.png" alt="6" border="0"></a>
+        <span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special">&lt;</span><span class="identifier">CompletionToken</span><span class="special">&gt;(</span><span class="identifier">token</span><span class="special">),</span> <a class="co" name="asio.overview.model.completion_tokens.c12" href="completion_tokens.html#asio.overview.model.completion_tokens.c13"><img src="../../../7.png" alt="7" border="0"></a>
+        <span class="special">&amp;</span><span class="identifier">s</span><span class="special">,</span> <a class="co" name="asio.overview.model.completion_tokens.c14" href="completion_tokens.html#asio.overview.model.completion_tokens.c15"><img src="../../../8.png" alt="8" border="0"></a>
+        <span class="identifier">b</span>
+      <span class="special">);</span>
+<span class="special">}</span>
+</pre>
+<div class="calloutlist"><table border="0" summary="Callout list">
+<tr>
+<td width="5%" valign="top" align="left"><p><a name="asio.overview.model.completion_tokens.c1"></a><a href="#asio.overview.model.completion_tokens.c0"><img src="../../../1.png" alt="1" border="0"></a> </p></td>
+<td valign="top" align="left"><p>
+              The <code class="computeroutput"><span class="identifier">completion_token_for</span></code>
+              concept checks whether the user-supplied completion token will satisfy
+              the specified completion signature. For older versions of C++, simply
+              use <code class="computeroutput"><span class="keyword">typename</span></code> here instead.
+            </p></td>
+</tr>
+<tr>
+<td width="5%" valign="top" align="left"><p><a name="asio.overview.model.completion_tokens.c3"></a><a href="#asio.overview.model.completion_tokens.c2"><img src="../../../2.png" alt="2" border="0"></a> </p></td>
+<td valign="top" align="left"><p>
+              Define a function object that contains the code to launch the asynchronous
+              operation. This is passed the concrete completion handler, followed
+              by any additional arguments that were passed through the <code class="computeroutput"><span class="identifier">async_result</span></code> trait.
+            </p></td>
+</tr>
+<tr>
+<td width="5%" valign="top" align="left"><p><a name="asio.overview.model.completion_tokens.c5"></a><a href="#asio.overview.model.completion_tokens.c4"><img src="../../../3.png" alt="3" border="0"></a> </p></td>
+<td valign="top" align="left"><p>
+              The body of the function object spawns a new thread to perform the
+              operation.
+            </p></td>
+</tr>
+<tr>
+<td width="5%" valign="top" align="left"><p><a name="asio.overview.model.completion_tokens.c7"></a><a href="#asio.overview.model.completion_tokens.c6"><img src="../../../4.png" alt="4" border="0"></a> </p></td>
+<td valign="top" align="left"><p>
+              Once the operation completes, the completion handler is passed the
+              result.
+            </p></td>
+</tr>
+<tr>
+<td width="5%" valign="top" align="left"><p><a name="asio.overview.model.completion_tokens.c9"></a><a href="#asio.overview.model.completion_tokens.c8"><img src="../../../5.png" alt="5" border="0"></a> </p></td>
+<td valign="top" align="left"><p>
+              The <code class="computeroutput"><span class="identifier">async_result</span></code> trait
+              is passed the (decayed) completion token type, and the completion signatures
+              of the asynchronous operation.
+            </p></td>
+</tr>
+<tr>
+<td width="5%" valign="top" align="left"><p><a name="asio.overview.model.completion_tokens.c11"></a><a href="#asio.overview.model.completion_tokens.c10"><img src="../../../6.png" alt="6" border="0"></a> </p></td>
+<td valign="top" align="left"><p>
+              Call the trait’s <code class="computeroutput"><span class="identifier">initiate</span></code>
+              member function, first passing the function object that launches the
+              operation.
+            </p></td>
+</tr>
+<tr>
+<td width="5%" valign="top" align="left"><p><a name="asio.overview.model.completion_tokens.c13"></a><a href="#asio.overview.model.completion_tokens.c12"><img src="../../../7.png" alt="7" border="0"></a> </p></td>
+<td valign="top" align="left"><p>
+              Next comes the forwarded completion token. The trait implementation
+              will convert this into a concrete completion handler.
+            </p></td>
+</tr>
+<tr>
+<td width="5%" valign="top" align="left"><p><a name="asio.overview.model.completion_tokens.c15"></a><a href="#asio.overview.model.completion_tokens.c14"><img src="../../../8.png" alt="8" border="0"></a> </p></td>
+<td valign="top" align="left"><p>
+              Finally, pass any additional arguments for the function object. Assume
+              that these may be decay-copied and moved by the trait implementation.
+            </p></td>
+</tr>
+</table></div>
+<p>
+          In practice we should call the <a class="link" href="../../reference/async_initiate.html" title="async_initiate">async_initiate</a>
+          helper function, rather than use the <code class="computeroutput"><span class="identifier">async_result</span></code>
+          trait directly. The <code class="computeroutput"><span class="identifier">async_initiate</span></code>
+          function automatically performs the necessary decay and forward of the
+          completion token, and also enables backwards compatibility with legacy
+          completion token implementations.
+        </p>
+<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span>
+    <span class="identifier">completion_token_for</span><span class="special">&lt;</span><span class="keyword">void</span><span class="special">(</span><span class="identifier">error_code</span><span class="special">,</span> <span class="identifier">size_t</span><span class="special">)&gt;</span>
+      <span class="identifier">CompletionToken</span><span class="special">&gt;</span>
+<span class="keyword">auto</span> <span class="identifier">async_read_some</span><span class="special">(</span>
+    <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&amp;</span> <span class="identifier">s</span><span class="special">,</span>
+    <span class="keyword">const</span> <span class="identifier">mutable_buffer</span><span class="special">&amp;</span> <span class="identifier">b</span><span class="special">,</span>
+    <span class="identifier">CompletionToken</span><span class="special">&amp;&amp;</span> <span class="identifier">token</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">auto</span> <span class="identifier">init</span> <span class="special">=</span> <span class="comment">/* ... as above ... */</span><span class="special">;</span>
+
+  <span class="keyword">return</span> <span class="identifier">async_initiate</span><span class="special">&lt;</span>
+      <span class="identifier">CompletionToken</span><span class="special">,</span>
+      <span class="keyword">void</span><span class="special">(</span><span class="identifier">error_code</span><span class="special">,</span> <span class="identifier">size_t</span><span class="special">)</span>
+    <span class="special">&gt;(</span><span class="identifier">init</span><span class="special">,</span> <span class="identifier">token</span><span class="special">,</span> <span class="special">&amp;</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">b</span><span class="special">);</span>
+<span class="special">}</span>
+</pre>
+<p>
+          We can think of the completion token as a kind of proto completion handler.
+          In the case where we pass a function object (like a lambda) as the completion
+          token, it already satisfies the completion handler requirements. The async_result
+          primary template handles this case by trivially forwarding the arguments
+          through:
+        </p>
+<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">CompletionToken</span><span class="special">,</span> <span class="identifier">completion_signature</span><span class="special">...</span> <span class="identifier">Signatures</span><span class="special">&gt;</span>
+<span class="keyword">struct</span> <span class="identifier">async_result</span>
+<span class="special">{</span>
+  <span class="keyword">template</span> <span class="special">&lt;</span>
+      <span class="keyword">class</span> <span class="identifier">Initiation</span><span class="special">,</span>
+      <span class="identifier">completion_handler_for</span><span class="special">&lt;</span><span class="identifier">Signatures</span><span class="special">...&gt;</span> <span class="identifier">CompletionHandler</span><span class="special">,</span>
+      <span class="keyword">class</span><span class="special">...</span> <span class="identifier">Args</span><span class="special">&gt;</span>
+  <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">initiate</span><span class="special">(</span>
+      <span class="identifier">Initiation</span><span class="special">&amp;&amp;</span> <span class="identifier">initiation</span><span class="special">,</span>
+      <span class="identifier">CompletionHandler</span><span class="special">&amp;&amp;</span> <span class="identifier">completion_handler</span><span class="special">,</span>
+      <span class="identifier">Args</span><span class="special">&amp;&amp;...</span> <span class="identifier">args</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special">&lt;</span><span class="identifier">Initiation</span><span class="special">&gt;(</span><span class="identifier">initiation</span><span class="special">)(</span>
+        <span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special">&lt;</span><span class="identifier">CompletionHandler</span><span class="special">&gt;(</span><span class="identifier">completion_handler</span><span class="special">),</span>
+        <span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special">&lt;</span><span class="identifier">Args</span><span class="special">&gt;(</span><span class="identifier">args</span><span class="special">)...);</span>
+  <span class="special">}</span>
+<span class="special">};</span>
+</pre>
+<p>
+          We can see here that this default implementation avoids copies of all arguments,
+          thus ensuring that eager initiation is as efficient as possible.
+        </p>
+<p>
+          On the other hand, a lazy completion token (such as <code class="computeroutput"><span class="identifier">use_awaitable</span></code>
+          above) may capture these arguments for deferred launching of the operation.
+          For example, a specialisation for a trivial <a class="link" href="../../reference/deferred.html" title="deferred">deferred</a>
+          token (that simply packages the operation for later) might look something
+          like this:
+        </p>
+<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="identifier">completion_signature</span><span class="special">...</span> <span class="identifier">Signatures</span><span class="special">&gt;</span>
+<span class="keyword">struct</span> <span class="identifier">async_result</span><span class="special">&lt;</span><span class="identifier">deferred_t</span><span class="special">,</span> <span class="identifier">Signatures</span><span class="special">...&gt;</span>
+<span class="special">{</span>
+  <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Initiation</span><span class="special">,</span> <span class="keyword">class</span><span class="special">...</span> <span class="identifier">Args</span><span class="special">&gt;</span>
+  <span class="keyword">static</span> <span class="keyword">auto</span> <span class="identifier">initiate</span><span class="special">(</span><span class="identifier">Initiation</span> <span class="identifier">initiation</span><span class="special">,</span> <span class="identifier">deferred_t</span><span class="special">,</span> <span class="identifier">Args</span><span class="special">...</span> <span class="identifier">args</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="keyword">return</span> <span class="special">[</span>
+        <span class="identifier">initiation</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">initiation</span><span class="special">),</span>
+        <span class="identifier">arg_pack</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">make_tuple</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">args</span><span class="special">)...)</span>
+      <span class="special">](</span><span class="keyword">auto</span><span class="special">&amp;&amp;</span> <span class="identifier">token</span><span class="special">)</span> <span class="keyword">mutable</span>
+    <span class="special">{</span>
+      <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">apply</span><span class="special">(</span>
+          <span class="special">[&amp;](</span><span class="keyword">auto</span><span class="special">&amp;&amp;...</span> <span class="identifier">args</span><span class="special">)</span>
+          <span class="special">{</span>
+            <span class="keyword">return</span> <span class="identifier">async_result</span><span class="special">&lt;</span><span class="identifier">decay_t</span><span class="special">&lt;</span><span class="keyword">decltype</span><span class="special">(</span><span class="identifier">token</span><span class="special">)&gt;,</span> <span class="identifier">Signatures</span><span class="special">...&gt;::</span><span class="identifier">initiate</span><span class="special">(</span>
+                <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">initiation</span><span class="special">),</span>
+                <span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special">&lt;</span><span class="keyword">decltype</span><span class="special">(</span><span class="identifier">token</span><span class="special">)&gt;(</span><span class="identifier">token</span><span class="special">),</span>
+                <span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special">&lt;</span><span class="keyword">decltype</span><span class="special">(</span><span class="identifier">args</span><span class="special">)&gt;(</span><span class="identifier">args</span><span class="special">)...</span>
+              <span class="special">);</span>
+          <span class="special">},</span>
+          <span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">arg_pack</span><span class="special">)</span>
+        <span class="special">);</span>
+    <span class="special">};</span>
+  <span class="special">}</span>
+<span class="special">};</span>
+</pre>
+<div class="footnotes">
+<br><hr width="100" align="left">
+<div class="footnote"><p><sup>[<a name="ftn.asio.overview.model.completion_tokens.f0" href="#asio.overview.model.completion_tokens.f0" class="para">6</a>] </sup>
+            The <a class="link" href="../../reference/awaitable.html" title="awaitable">awaitable</a> class template
+            is included with the Asio library as a return type for C++20 coroutines.
+            These coroutines can be trivially implemented in terms of other <code class="computeroutput"><span class="identifier">awaitable</span></code>-based coroutines.
+          </p></div>
+<div class="footnote"><p><sup>[<a name="ftn.asio.overview.model.completion_tokens.f1" href="#asio.overview.model.completion_tokens.f1" class="para">7</a>] </sup>
+            For illustrative purposes only. Not recommended for real world use!
+          </p></div>
+</div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
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+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="child_agents.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="allocators.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.model.executors"></a><a class="link" href="executors.html" title="Executors">Executors</a>
+</h4></div></div></div>
+<p>
+          Every asynchronous agent has an associated <span class="emphasis"><em>executor</em></span>.
+          An agent's executor determines how the agent's completion handlers are
+          queued and ultimately run.
+        </p>
+<p>
+          Example uses of executors include:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              Coordinating a group of asynchronous agents that operate on shared
+              data structures, ensuring that the agents' completion handlers never
+              run concurrently<sup>[<a name="asio.overview.model.executors.f0" href="#ftn.asio.overview.model.executors.f0" class="footnote">5</a>]</sup>.
+            </li>
+<li class="listitem">
+              Ensuring that agents are run on specified execution resource (e.g.
+              a CPU) that is proximal to data or an event source (e.g. a NIC).
+            </li>
+<li class="listitem">
+              Denoting a group of related agents, and so enabling dynamic thread
+              pools to make smarter scheduling decisions (such as moving the agents
+              between execution resources as a unit).
+            </li>
+<li class="listitem">
+              Queuing all completion handlers to run on a GUI application thread,
+              so that they may safely update user interface elements.
+            </li>
+<li class="listitem">
+              Returning an asynchronous operation's default executor as-is, to run
+              completion handlers as close as possible to the event that triggered
+              the operation's completion.
+            </li>
+<li class="listitem">
+              Adapting an asynchronous operation's default executor, to run code
+              before and after every completion handler, such as logging, user authorisation,
+              or exception handling.
+            </li>
+<li class="listitem">
+              Specifying a priority for an asynchronous agent and its completion
+              handlers.
+            </li>
+</ul></div>
+<p>
+          The asynchronous operations within an asynchronous agent use the agent's
+          associated executor to:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              Track the existence of the work that the asynchronous operation represents,
+              while the operation is outstanding.
+            </li>
+<li class="listitem">
+              Enqueue the completion handler for execution on completion of an operation.
+            </li>
+<li class="listitem">
+              Ensure that completion handlers do not run re-entrantly, if doing so
+              might lead to inadvertent recursion and stack overflow.
+            </li>
+</ul></div>
+<p>
+          Thus, an asynchronous agent's associated executor represents a policy of
+          how, where, and when the agent should run, specified as a cross-cutting
+          concern to the code that makes up the agent.
+        </p>
+<div class="footnotes">
+<br><hr width="100" align="left">
+<div class="footnote"><p><sup>[<a name="ftn.asio.overview.model.executors.f0" href="#asio.overview.model.executors.f0" class="para">5</a>] </sup>
+                In Asio, this kind of executor is called a <a class="link" href="../core/strands.html" title="Strands: Use Threads Without Explicit Locking">strand</a>.
+              </p></div>
+</div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="child_agents.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="allocators.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/model/higher_levels.html

@@ -0,0 +1,71 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Higher Level Abstractions</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../model.html" title="Asynchronous Model">
+<link rel="prev" href="library_elements.html" title="Supporting Library Elements">
+<link rel="next" href="../core.html" title="Core Concepts and Functionality">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="library_elements.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../core.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.model.higher_levels"></a><a class="link" href="higher_levels.html" title="Higher Level Abstractions">Higher Level Abstractions</a>
+</h4></div></div></div>
+<p>
+          <span class="inlinemediaobject"><img src="../../../higher_level_model.png" width="940"></span>
+        </p>
+<p>
+          The asynchronous model presented in this section provides a basis for defining
+          higher level abstractions. Asio builds on this core model to provide additional
+          facilities, such as:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              I/O objects such as <a class="link" href="../networking.html" title="Networking">sockets</a>
+              and <a class="link" href="../timers.html" title="Timers">timers</a> that expose
+              asynchronous operations on top of this model.
+            </li>
+<li class="listitem">
+              Concrete executors, such as the <a class="link" href="../../reference/io_context.html" title="io_context">io_context</a>
+              executor, <a class="link" href="../../reference/thread_pool.html" title="thread_pool">thread_pool</a>
+              executor, and the <a class="link" href="../../reference/strand.html" title="strand">strand</a>
+              adapter which guarantees non-concurrent execution of completion handlers.
+            </li>
+<li class="listitem">
+              Completion tokens that facilitate different composition mechanisms,
+              such as <a class="link" href="../composition/cpp20_coroutines.html" title="C++20 Coroutines Support">C++
+              coroutines</a>, <a class="link" href="../composition/spawn.html" title="Stackful Coroutines">stackful
+              coroutines</a>, <a class="link" href="../composition/futures.html" title="Futures">futures</a>,
+              and <a class="link" href="../../reference/deferred.html" title="deferred">deferred operations</a>.
+            </li>
+<li class="listitem">
+              High level support for C++ coroutines that combines support executors
+              and cancellation slots to allow for <a class="link" href="../composition/cpp20_coroutines.html#asio.overview.composition.cpp20_coroutines.co_ordinating_parallel_coroutines">easy
+              coordination of concurrent asynchronous agents</a>.
+            </li>
+</ul></div>
+<p>
+          To allow users to more easily write their own asynchronous operations that
+          adhere to this model, Asio also provides the helper function <a class="link" href="../../reference/async_compose.html" title="async_compose">async_compose</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="library_elements.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../core.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/model/library_elements.html

@@ -0,0 +1,185 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Supporting Library Elements</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../model.html" title="Asynchronous Model">
+<link rel="prev" href="completion_tokens.html" title="Completion Tokens">
+<link rel="next" href="higher_levels.html" title="Higher Level Abstractions">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="completion_tokens.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="higher_levels.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.model.library_elements"></a><a class="link" href="library_elements.html" title="Supporting Library Elements">Supporting Library
+        Elements</a>
+</h4></div></div></div>
+<p>
+          The Asio asynchronous model is enabled by the library elements listed in
+          the table below.
+        </p>
+<div class="informaltable"><table class="table">
+<colgroup>
+<col>
+<col>
+</colgroup>
+<thead><tr>
+<th>
+                  <p>
+                    Library Element
+                  </p>
+                </th>
+<th>
+                  <p>
+                    Description
+                  </p>
+                </th>
+</tr></thead>
+<tbody>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">completion_signature</span></code>
+                    concept
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Defines valid completion signature forms.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">completion_handler_for</span></code>
+                    concept
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Determines whether a completion handler is callable with a given
+                    set of completion signatures.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <a class="link" href="../../reference/async_result.html" title="async_result">async_result</a>
+                    trait
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Converts a completion signature and completion token into a concrete
+                    completion handler, and launches the operation.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <a class="link" href="../../reference/async_initiate.html" title="async_initiate">async_initiate</a>
+                    function
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Helper function to simplify use of the <code class="computeroutput"><span class="identifier">async_result</span></code>
+                    trait.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">completion_token_for</span></code>
+                    concept
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Determines whether a completion token produces a completion handler
+                    for a given set of completion signatures.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <a class="link" href="../../reference/associator.html" title="associator">associator</a> trait
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Automatically propagates all associators through layers of abstraction.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <a class="link" href="../../reference/associated_executor.html" title="associated_executor">associated_executor</a>
+                    trait, <code class="computeroutput"><span class="identifier">associated_executor_t</span></code>
+                    type alias, and <a class="link" href="../../reference/get_associated_executor.html" title="get_associated_executor">get_associated_executor</a>
+                    function
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Defines an asynchronous agent’s associated executor.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <a class="link" href="../../reference/associated_allocator.html" title="associated_allocator">associated_allocator</a>
+                    trait, <code class="computeroutput"><span class="identifier">associated_allocator_t</span></code>
+                    type alias, and <a class="link" href="../../reference/get_associated_allocator.html" title="get_associated_allocator">get_associated_allocator</a>
+                    function
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Defines an asynchronous agent’s associated allocator.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <a class="link" href="../../reference/associated_cancellation_slot.html" title="associated_cancellation_slot">associated_cancellation_slot</a>
+                    trait, <code class="computeroutput"><span class="identifier">associated_cancellation_slot_t</span></code>
+                    type alias, and <a class="link" href="../../reference/get_associated_cancellation_slot.html" title="get_associated_cancellation_slot">get_associated_cancellation_slot</a>
+                    function
+                  </p>
+                </td>
+<td>
+                  <p>
+                    Defines an asynchronous agent’s associated cancellation slot.
+                  </p>
+                </td>
+</tr>
+</tbody>
+</table></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="completion_tokens.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../model.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="higher_levels.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/networking.html

@@ -0,0 +1,50 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Networking</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="composition/immediate_completion.html" title="Customising Immediate Completion">
+<link rel="next" href="networking/protocols.html" title="TCP, UDP and ICMP">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="composition/immediate_completion.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="networking/protocols.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.networking"></a><a class="link" href="networking.html" title="Networking">Networking</a>
+</h3></div></div></div>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a class="link" href="networking/protocols.html" title="TCP, UDP and ICMP">TCP, UDP and ICMP</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="networking/other_protocols.html" title="Support for Other Protocols">Support for
+            Other Protocols</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="networking/iostreams.html" title="Socket Iostreams">Socket Iostreams</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="networking/bsd_sockets.html" title="The BSD Socket API and Asio">The BSD Socket API
+            and Asio</a>
+          </li>
+</ul></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="composition/immediate_completion.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="networking/protocols.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/networking/bsd_sockets.html

@@ -0,0 +1,554 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>The BSD Socket API and Asio</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../networking.html" title="Networking">
+<link rel="prev" href="iostreams.html" title="Socket Iostreams">
+<link rel="next" href="../timers.html" title="Timers">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="iostreams.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../networking.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../timers.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.networking.bsd_sockets"></a><a class="link" href="bsd_sockets.html" title="The BSD Socket API and Asio">The BSD Socket
+        API and Asio</a>
+</h4></div></div></div>
+<p>
+          The Asio library includes a low-level socket interface based on the BSD
+          socket API, which is widely implemented and supported by extensive literature.
+          It is also used as the basis for networking APIs in other languages, like
+          Java. This low-level interface is designed to support the development of
+          efficient and scalable applications. For example, it permits programmers
+          to exert finer control over the number of system calls, avoid redundant
+          data copying, minimise the use of resources like threads, and so on.
+        </p>
+<p>
+          Unsafe and error prone aspects of the BSD socket API are not included.
+          For example, the use of <code class="computeroutput"><span class="keyword">int</span></code>
+          to represent all sockets lacks type safety. The socket representation in
+          Asio uses a distinct type for each protocol, e.g. for TCP one would use
+          <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span></code>, and for UDP one uses <code class="computeroutput"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">socket</span></code>.
+        </p>
+<p>
+          The following table shows the mapping between the BSD socket API and Asio:
+        </p>
+<div class="informaltable"><table class="table">
+<colgroup>
+<col>
+<col>
+</colgroup>
+<thead><tr>
+<th>
+                  <p>
+                    BSD Socket API Elements
+                  </p>
+                </th>
+<th>
+                  <p>
+                    Equivalents in Asio
+                  </p>
+                </th>
+</tr></thead>
+<tbody>
+<tr>
+<td>
+                  <p>
+                    socket descriptor - <code class="computeroutput"><span class="keyword">int</span></code>
+                    (POSIX) or <code class="computeroutput"><span class="identifier">SOCKET</span></code>
+                    (Windows)
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/ip__tcp/socket.html" title="ip::tcp::socket">ip::tcp::socket</a>,
+                    <a class="link" href="../../reference/ip__tcp/acceptor.html" title="ip::tcp::acceptor">ip::tcp::acceptor</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/ip__udp/socket.html" title="ip::udp::socket">ip::udp::socket</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket.html" title="basic_socket">basic_socket</a>,
+                    <a class="link" href="../../reference/basic_stream_socket.html" title="basic_stream_socket">basic_stream_socket</a>,
+                    <a class="link" href="../../reference/basic_datagram_socket.html" title="basic_datagram_socket">basic_datagram_socket</a>,
+                    <a class="link" href="../../reference/basic_raw_socket.html" title="basic_raw_socket">basic_raw_socket</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">in_addr</span></code>, <code class="computeroutput"><span class="identifier">in6_addr</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <a class="link" href="../../reference/ip__address.html" title="ip::address">ip::address</a>,
+                    <a class="link" href="../../reference/ip__address.html" title="ip::address">ip::address_v4</a>,
+                    <a class="link" href="../../reference/ip__address.html" title="ip::address">ip::address_v6</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">sockaddr_in</span></code>,
+                    <code class="computeroutput"><span class="identifier">sockaddr_in6</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/ip__tcp/endpoint.html" title="ip::tcp::endpoint">ip::tcp::endpoint</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/ip__udp/endpoint.html" title="ip::udp::endpoint">ip::udp::endpoint</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/ip__basic_endpoint.html" title="ip::basic_endpoint">ip::basic_endpoint</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">accept</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket_acceptor/accept.html" title="basic_socket_acceptor::accept">ip::tcp::acceptor::accept()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket_acceptor/accept.html" title="basic_socket_acceptor::accept">basic_socket_acceptor::accept()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">bind</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket/bind.html" title="basic_socket::bind">ip::tcp::acceptor::bind()</a>,
+                    <a class="link" href="../../reference/basic_socket/bind.html" title="basic_socket::bind">ip::tcp::socket::bind()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_socket/bind.html" title="basic_socket::bind">ip::udp::socket::bind()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket/bind.html" title="basic_socket::bind">basic_socket::bind()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">close</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket/close.html" title="basic_socket::close">ip::tcp::acceptor::close()</a>,
+                    <a class="link" href="../../reference/basic_socket/close.html" title="basic_socket::close">ip::tcp::socket::close()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_socket/close.html" title="basic_socket::close">ip::udp::socket::close()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket/close.html" title="basic_socket::close">basic_socket::close()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">connect</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket/connect.html" title="basic_socket::connect">ip::tcp::socket::connect()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_socket/connect.html" title="basic_socket::connect">ip::udp::socket::connect()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket/connect.html" title="basic_socket::connect">basic_socket::connect()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">getaddrinfo</span><span class="special">()</span></code>,
+                    <code class="computeroutput"><span class="identifier">gethostbyaddr</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">gethostbyname</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">getnameinfo</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">getservbyname</span><span class="special">()</span></code>, <code class="computeroutput"><span class="identifier">getservbyport</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/ip__basic_resolver/resolve.html" title="ip::basic_resolver::resolve">ip::tcp::resolver::resolve()</a>,
+                    <a class="link" href="../../reference/ip__basic_resolver/async_resolve.html" title="ip::basic_resolver::async_resolve">ip::tcp::resolver::async_resolve()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/ip__basic_resolver/resolve.html" title="ip::basic_resolver::resolve">ip::udp::resolver::resolve()</a>,
+                    <a class="link" href="../../reference/ip__basic_resolver/async_resolve.html" title="ip::basic_resolver::async_resolve">ip::udp::resolver::async_resolve()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/ip__basic_resolver/resolve.html" title="ip::basic_resolver::resolve">ip::basic_resolver::resolve()</a>,
+                    <a class="link" href="../../reference/ip__basic_resolver/async_resolve.html" title="ip::basic_resolver::async_resolve">ip::basic_resolver::async_resolve()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">gethostname</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <a class="link" href="../../reference/ip__host_name.html" title="ip::host_name">ip::host_name()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">getpeername</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket/remote_endpoint.html" title="basic_socket::remote_endpoint">ip::tcp::socket::remote_endpoint()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_socket/remote_endpoint.html" title="basic_socket::remote_endpoint">ip::udp::socket::remote_endpoint()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket/remote_endpoint.html" title="basic_socket::remote_endpoint">basic_socket::remote_endpoint()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">getsockname</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket/local_endpoint.html" title="basic_socket::local_endpoint">ip::tcp::acceptor::local_endpoint()</a>,
+                    <a class="link" href="../../reference/basic_socket/local_endpoint.html" title="basic_socket::local_endpoint">ip::tcp::socket::local_endpoint()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_socket/local_endpoint.html" title="basic_socket::local_endpoint">ip::udp::socket::local_endpoint()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket/local_endpoint.html" title="basic_socket::local_endpoint">basic_socket::local_endpoint()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">getsockopt</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket/get_option.html" title="basic_socket::get_option">ip::tcp::acceptor::get_option()</a>,
+                    <a class="link" href="../../reference/basic_socket/get_option.html" title="basic_socket::get_option">ip::tcp::socket::get_option()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_socket/get_option.html" title="basic_socket::get_option">ip::udp::socket::get_option()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket/get_option.html" title="basic_socket::get_option">basic_socket::get_option()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">inet_addr</span><span class="special">()</span></code>,
+                    <code class="computeroutput"><span class="identifier">inet_aton</span><span class="special">()</span></code>,
+                    <code class="computeroutput"><span class="identifier">inet_pton</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <a class="link" href="../../reference/ip__address/from_string.html" title="ip::address::from_string">ip::address::from_string()</a>,
+                    <a class="link" href="../../reference/ip__address/from_string.html" title="ip::address::from_string">ip::address_v4::from_string()</a>,
+                    <a class="link" href="../../reference/ip__address/from_string.html" title="ip::address::from_string">ip_address_v6::from_string()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">inet_ntoa</span><span class="special">()</span></code>,
+                    <code class="computeroutput"><span class="identifier">inet_ntop</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <a class="link" href="../../reference/ip__address/to_string.html" title="ip::address::to_string">ip::address::to_string()</a>,
+                    <a class="link" href="../../reference/ip__address/to_string.html" title="ip::address::to_string">ip::address_v4::to_string()</a>,
+                    <a class="link" href="../../reference/ip__address/to_string.html" title="ip::address::to_string">ip_address_v6::to_string()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">ioctl</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket/io_control.html" title="basic_socket::io_control">ip::tcp::socket::io_control()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_socket/io_control.html" title="basic_socket::io_control">ip::udp::socket::io_control()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket/io_control.html" title="basic_socket::io_control">basic_socket::io_control()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">listen</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket_acceptor/listen.html" title="basic_socket_acceptor::listen">ip::tcp::acceptor::listen()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket_acceptor/listen.html" title="basic_socket_acceptor::listen">basic_socket_acceptor::listen()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">poll</span><span class="special">()</span></code>,
+                    <code class="computeroutput"><span class="identifier">select</span><span class="special">()</span></code>,
+                    <code class="computeroutput"><span class="identifier">pselect</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <a class="link" href="../../reference/io_context/run.html" title="io_context::run">io_context::run()</a>,
+                    <a class="link" href="../../reference/io_context/run_one.html" title="io_context::run_one">io_context::run_one()</a>,
+                    <a class="link" href="../../reference/io_context/poll.html" title="io_context::poll">io_context::poll()</a>,
+                    <a class="link" href="../../reference/io_context/poll_one.html" title="io_context::poll_one">io_context::poll_one()</a>
+                  </p>
+                  <p>
+                    Note: in conjunction with asynchronous operations.
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">readv</span><span class="special">()</span></code>,
+                    <code class="computeroutput"><span class="identifier">recv</span><span class="special">()</span></code>,
+                    <code class="computeroutput"><span class="identifier">read</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_stream_socket/read_some.html" title="basic_stream_socket::read_some">ip::tcp::socket::read_some()</a>,
+                    <a class="link" href="../../reference/basic_stream_socket/async_read_some.html" title="basic_stream_socket::async_read_some">ip::tcp::socket::async_read_some()</a>,
+                    <a class="link" href="../../reference/basic_stream_socket/receive.html" title="basic_stream_socket::receive">ip::tcp::socket::receive()</a>,
+                    <a class="link" href="../../reference/basic_stream_socket/async_receive.html" title="basic_stream_socket::async_receive">ip::tcp::socket::async_receive()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_datagram_socket/receive.html" title="basic_datagram_socket::receive">ip::udp::socket::receive()</a>,
+                    <a class="link" href="../../reference/basic_datagram_socket/async_receive.html" title="basic_datagram_socket::async_receive">ip::udp::socket::async_receive()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_stream_socket/read_some.html" title="basic_stream_socket::read_some">basic_stream_socket::read_some()</a>,
+                    <a class="link" href="../../reference/basic_stream_socket/async_read_some.html" title="basic_stream_socket::async_read_some">basic_stream_socket::async_read_some()</a>,
+                    <a class="link" href="../../reference/basic_stream_socket/receive.html" title="basic_stream_socket::receive">basic_stream_socket::receive()</a>,
+                    <a class="link" href="../../reference/basic_stream_socket/async_receive.html" title="basic_stream_socket::async_receive">basic_stream_socket::async_receive()</a>,
+                    <a class="link" href="../../reference/basic_datagram_socket/receive.html" title="basic_datagram_socket::receive">basic_datagram_socket::receive()</a>,
+                    <a class="link" href="../../reference/basic_datagram_socket/async_receive.html" title="basic_datagram_socket::async_receive">basic_datagram_socket::async_receive()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">recvfrom</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_datagram_socket/receive_from.html" title="basic_datagram_socket::receive_from">ip::udp::socket::receive_from()</a>,
+                    <a class="link" href="../../reference/basic_datagram_socket/async_receive_from.html" title="basic_datagram_socket::async_receive_from">ip::udp::socket::async_receive_from()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_datagram_socket/receive_from.html" title="basic_datagram_socket::receive_from">basic_datagram_socket::receive_from()</a>,
+                    <a class="link" href="../../reference/basic_datagram_socket/async_receive_from.html" title="basic_datagram_socket::async_receive_from">basic_datagram_socket::async_receive_from()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">send</span><span class="special">()</span></code>,
+                    <code class="computeroutput"><span class="identifier">write</span><span class="special">()</span></code>,
+                    <code class="computeroutput"><span class="identifier">writev</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_stream_socket/write_some.html" title="basic_stream_socket::write_some">ip::tcp::socket::write_some()</a>,
+                    <a class="link" href="../../reference/basic_stream_socket/async_write_some.html" title="basic_stream_socket::async_write_some">ip::tcp::socket::async_write_some()</a>,
+                    <a class="link" href="../../reference/basic_stream_socket/send.html" title="basic_stream_socket::send">ip::tcp::socket::send()</a>,
+                    <a class="link" href="../../reference/basic_stream_socket/async_send.html" title="basic_stream_socket::async_send">ip::tcp::socket::async_send()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_datagram_socket/send.html" title="basic_datagram_socket::send">ip::udp::socket::send()</a>,
+                    <a class="link" href="../../reference/basic_datagram_socket/async_send.html" title="basic_datagram_socket::async_send">ip::udp::socket::async_send()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_stream_socket/write_some.html" title="basic_stream_socket::write_some">basic_stream_socket::write_some()</a>,
+                    <a class="link" href="../../reference/basic_stream_socket/async_write_some.html" title="basic_stream_socket::async_write_some">basic_stream_socket::async_write_some()</a>,
+                    <a class="link" href="../../reference/basic_stream_socket/send.html" title="basic_stream_socket::send">basic_stream_socket::send()</a>,
+                    <a class="link" href="../../reference/basic_stream_socket/async_send.html" title="basic_stream_socket::async_send">basic_stream_socket::async_send()</a>,
+                    <a class="link" href="../../reference/basic_datagram_socket/send.html" title="basic_datagram_socket::send">basic_datagram_socket::send()</a>,
+                    <a class="link" href="../../reference/basic_datagram_socket/async_send.html" title="basic_datagram_socket::async_send">basic_datagram_socket::async_send()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">sendto</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_datagram_socket/send_to.html" title="basic_datagram_socket::send_to">ip::udp::socket::send_to()</a>,
+                    <a class="link" href="../../reference/basic_datagram_socket/async_send_to.html" title="basic_datagram_socket::async_send_to">ip::udp::socket::async_send_to()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_datagram_socket/send_to.html" title="basic_datagram_socket::send_to">basic_datagram_socket::send_to()</a>,
+                    <a class="link" href="../../reference/basic_datagram_socket/async_send_to.html" title="basic_datagram_socket::async_send_to">basic_datagram_socket::async_send_to()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">setsockopt</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket/set_option.html" title="basic_socket::set_option">ip::tcp::acceptor::set_option()</a>,
+                    <a class="link" href="../../reference/basic_socket/set_option.html" title="basic_socket::set_option">ip::tcp::socket::set_option()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_socket/set_option.html" title="basic_socket::set_option">ip::udp::socket::set_option()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket/set_option.html" title="basic_socket::set_option">basic_socket::set_option()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">shutdown</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket/shutdown.html" title="basic_socket::shutdown">ip::tcp::socket::shutdown()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_socket/shutdown.html" title="basic_socket::shutdown">ip::udp::socket::shutdown()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket/shutdown.html" title="basic_socket::shutdown">basic_socket::shutdown()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">sockatmark</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket/at_mark.html" title="basic_socket::at_mark">ip::tcp::socket::at_mark()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket/at_mark.html" title="basic_socket::at_mark">basic_socket::at_mark()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">socket</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    For TCP: <a class="link" href="../../reference/basic_socket/open.html" title="basic_socket::open">ip::tcp::acceptor::open()</a>,
+                    <a class="link" href="../../reference/basic_socket/open.html" title="basic_socket::open">ip::tcp::socket::open()</a>
+                  </p>
+                  <p>
+                    For UDP: <a class="link" href="../../reference/basic_socket/open.html" title="basic_socket::open">ip::udp::socket::open()</a>
+                  </p>
+                  <p>
+                    <a class="link" href="../../reference/basic_socket/open.html" title="basic_socket::open">basic_socket::open()</a>
+                  </p>
+                </td>
+</tr>
+<tr>
+<td>
+                  <p>
+                    <code class="computeroutput"><span class="identifier">socketpair</span><span class="special">()</span></code>
+                  </p>
+                </td>
+<td>
+                  <p>
+                    <a class="link" href="../../reference/local__connect_pair.html" title="local::connect_pair">local::connect_pair()</a>
+                  </p>
+                  <p>
+                    Note: POSIX operating systems only.
+                  </p>
+                </td>
+</tr>
+</tbody>
+</table></div>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="iostreams.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../networking.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../timers.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

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+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Socket Iostreams</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../networking.html" title="Networking">
+<link rel="prev" href="other_protocols.html" title="Support for Other Protocols">
+<link rel="next" href="bsd_sockets.html" title="The BSD Socket API and Asio">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="other_protocols.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../networking.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="bsd_sockets.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.networking.iostreams"></a><a class="link" href="iostreams.html" title="Socket Iostreams">Socket Iostreams</a>
+</h4></div></div></div>
+<p>
+          Asio includes classes that implement iostreams on top of sockets. These
+          hide away the complexities associated with endpoint resolution, protocol
+          independence, etc. To create a connection one might simply write:
+        </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">iostream</span> <span class="identifier">stream</span><span class="special">(</span><span class="string">"www.boost.org"</span><span class="special">,</span> <span class="string">"http"</span><span class="special">);</span>
+<span class="keyword">if</span> <span class="special">(!</span><span class="identifier">stream</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="comment">// Can't connect.</span>
+<span class="special">}</span>
+</pre>
+<p>
+          The iostream class can also be used in conjunction with an acceptor to
+          create simple servers. For example:
+        </p>
+<pre class="programlisting"><span class="identifier">io_context</span> <span class="identifier">ioc</span><span class="special">;</span>
+
+<span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">endpoint</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">v4</span><span class="special">(),</span> <span class="number">80</span><span class="special">);</span>
+<span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">acceptor</span> <span class="identifier">acceptor</span><span class="special">(</span><span class="identifier">ios</span><span class="special">,</span> <span class="identifier">endpoint</span><span class="special">);</span>
+
+<span class="keyword">for</span> <span class="special">(;;)</span>
+<span class="special">{</span>
+  <span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">iostream</span> <span class="identifier">stream</span><span class="special">;</span>
+  <span class="identifier">acceptor</span><span class="special">.</span><span class="identifier">accept</span><span class="special">(</span><span class="identifier">stream</span><span class="special">.</span><span class="identifier">socket</span><span class="special">());</span>
+  <span class="special">...</span>
+<span class="special">}</span>
+</pre>
+<p>
+          Timeouts may be set by calling <code class="computeroutput"><span class="identifier">expires_at</span><span class="special">()</span></code> or <code class="computeroutput"><span class="identifier">expires_from_now</span><span class="special">()</span></code> to establish a deadline. Any socket operations
+          that occur past the deadline will put the iostream into a "bad"
+          state.
+        </p>
+<p>
+          For example, a simple client program like this:
+        </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">iostream</span> <span class="identifier">stream</span><span class="special">;</span>
+<span class="identifier">stream</span><span class="special">.</span><span class="identifier">expires_from_now</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">60</span><span class="special">));</span>
+<span class="identifier">stream</span><span class="special">.</span><span class="identifier">connect</span><span class="special">(</span><span class="string">"www.boost.org"</span><span class="special">,</span> <span class="string">"http"</span><span class="special">);</span>
+<span class="identifier">stream</span> <span class="special">&lt;&lt;</span> <span class="string">"GET /LICENSE_1_0.txt HTTP/1.0\r\n"</span><span class="special">;</span>
+<span class="identifier">stream</span> <span class="special">&lt;&lt;</span> <span class="string">"Host: www.boost.org\r\n"</span><span class="special">;</span>
+<span class="identifier">stream</span> <span class="special">&lt;&lt;</span> <span class="string">"Accept: */*\r\n"</span><span class="special">;</span>
+<span class="identifier">stream</span> <span class="special">&lt;&lt;</span> <span class="string">"Connection: close\r\n\r\n"</span><span class="special">;</span>
+<span class="identifier">stream</span><span class="special">.</span><span class="identifier">flush</span><span class="special">();</span>
+<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">stream</span><span class="special">.</span><span class="identifier">rdbuf</span><span class="special">();</span>
+</pre>
+<p>
+          will fail if all the socket operations combined take longer than 60 seconds.
+        </p>
+<p>
+          If an error does occur, the iostream's <code class="computeroutput"><span class="identifier">error</span><span class="special">()</span></code> member function may be used to retrieve
+          the error code from the most recent system call:
+        </p>
+<pre class="programlisting"><span class="keyword">if</span> <span class="special">(!</span><span class="identifier">stream</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Error: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">stream</span><span class="special">.</span><span class="identifier">error</span><span class="special">().</span><span class="identifier">message</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">"\n"</span><span class="special">;</span>
+<span class="special">}</span>
+</pre>
+<h6>
+<a name="asio.overview.networking.iostreams.h0"></a>
+          <span><a name="asio.overview.networking.iostreams.see_also"></a></span><a class="link" href="iostreams.html#asio.overview.networking.iostreams.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/ip__tcp/iostream.html" title="ip::tcp::iostream">ip::tcp::iostream</a>,
+          <a class="link" href="../../reference/basic_socket_iostream.html" title="basic_socket_iostream">basic_socket_iostream</a>,
+          <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.iostreams">iostreams examples</a>.
+        </p>
+<h6>
+<a name="asio.overview.networking.iostreams.h1"></a>
+          <span><a name="asio.overview.networking.iostreams.notes"></a></span><a class="link" href="iostreams.html#asio.overview.networking.iostreams.notes">Notes</a>
+        </h6>
+<p>
+          These iostream templates only support <code class="computeroutput"><span class="keyword">char</span></code>,
+          not <code class="computeroutput"><span class="keyword">wchar_t</span></code>, and do not perform
+          any code conversion.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="other_protocols.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../networking.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="bsd_sockets.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/networking/other_protocols.html

@@ -0,0 +1,147 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Support for Other Protocols</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../networking.html" title="Networking">
+<link rel="prev" href="protocols.html" title="TCP, UDP and ICMP">
+<link rel="next" href="iostreams.html" title="Socket Iostreams">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="protocols.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../networking.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="iostreams.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.networking.other_protocols"></a><a class="link" href="other_protocols.html" title="Support for Other Protocols">Support for
+        Other Protocols</a>
+</h4></div></div></div>
+<p>
+          Support for other socket protocols (such as Bluetooth or IRCOMM sockets)
+          can be added by implementing the <a class="link" href="../../reference/Protocol.html" title="Protocol requirements">protocol
+          type requirements</a>. However, in many cases these protocols may also
+          be used with Asio's generic protocol support. For this, Asio provides the
+          following four classes:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              <a class="link" href="../../reference/generic__datagram_protocol.html" title="generic::datagram_protocol"><code class="computeroutput"><span class="identifier">generic</span><span class="special">::</span><span class="identifier">datagram_protocol</span></code></a>
+            </li>
+<li class="listitem">
+              <a class="link" href="../../reference/generic__raw_protocol.html" title="generic::raw_protocol"><code class="computeroutput"><span class="identifier">generic</span><span class="special">::</span><span class="identifier">raw_protocol</span></code></a>
+            </li>
+<li class="listitem">
+              <a class="link" href="../../reference/generic__seq_packet_protocol.html" title="generic::seq_packet_protocol"><code class="computeroutput"><span class="identifier">generic</span><span class="special">::</span><span class="identifier">seq_packet_protocol</span></code></a>
+            </li>
+<li class="listitem">
+              <a class="link" href="../../reference/generic__stream_protocol.html" title="generic::stream_protocol"><code class="computeroutput"><span class="identifier">generic</span><span class="special">::</span><span class="identifier">stream_protocol</span></code></a>
+            </li>
+</ul></div>
+<p>
+          These classes implement the <a class="link" href="../../reference/Protocol.html" title="Protocol requirements">protocol
+          type requirements</a>, but allow the user to specify the address family
+          (e.g. <code class="computeroutput"><span class="identifier">AF_INET</span></code>) and protocol
+          type (e.g. <code class="computeroutput"><span class="identifier">IPPROTO_TCP</span></code>)
+          at runtime. For example:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">generic</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">my_socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">open</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">generic</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">(</span><span class="identifier">AF_INET</span><span class="special">,</span> <span class="identifier">IPPROTO_TCP</span><span class="special">));</span>
+<span class="special">...</span>
+</pre>
+<p>
+          An endpoint class template, <a class="link" href="../../reference/generic__basic_endpoint.html" title="generic::basic_endpoint"><code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">generic</span><span class="special">::</span><span class="identifier">basic_endpoint</span></code></a>, is included to
+          support these protocol classes. This endpoint can hold any other endpoint
+          type, provided its native representation fits into a <code class="computeroutput"><span class="identifier">sockaddr_storage</span></code>
+          object. This class will also convert from other types that implement the
+          <a class="link" href="../../reference/Endpoint.html" title="Endpoint requirements">endpoint</a> type requirements:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">my_endpoint1</span> <span class="special">=</span> <span class="special">...;</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">generic</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">my_endpoint2</span><span class="special">(</span><span class="identifier">my_endpoint1</span><span class="special">);</span>
+</pre>
+<p>
+          The conversion is implicit, so as to support the following use cases:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">generic</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">my_socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">my_endpoint</span> <span class="special">=</span> <span class="special">...;</span>
+<span class="identifier">my_socket</span><span class="special">.</span><span class="identifier">connect</span><span class="special">(</span><span class="identifier">my_endpoint</span><span class="special">);</span>
+</pre>
+<h6>
+<a name="asio.overview.networking.other_protocols.h0"></a>
+          <span><a name="asio.overview.networking.other_protocols.c__11_move_construction"></a></span><a class="link" href="other_protocols.html#asio.overview.networking.other_protocols.c__11_move_construction">C++11
+          Move Construction</a>
+        </h6>
+<p>
+          When using C++11, it is possible to perform move construction from a socket
+          (or acceptor) object to convert to the more generic protocol's socket (or
+          acceptor) type. If the protocol conversion is valid:
+        </p>
+<pre class="programlisting"><span class="identifier">Protocol1</span> <span class="identifier">p1</span> <span class="special">=</span> <span class="special">...;</span>
+<span class="identifier">Protocol2</span> <span class="identifier">p2</span><span class="special">(</span><span class="identifier">p1</span><span class="special">);</span>
+</pre>
+<p>
+          then the corresponding socket conversion is allowed:
+        </p>
+<pre class="programlisting"><span class="identifier">Protocol1</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">my_socket1</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="special">...</span>
+<span class="identifier">Protocol2</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">my_socket2</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">my_socket1</span><span class="special">));</span>
+</pre>
+<p>
+          For example, one possible conversion is from a TCP socket to a generic
+          stream-oriented socket:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">my_socket1</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="special">...</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">generic</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">my_socket2</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">move</span><span class="special">(</span><span class="identifier">my_socket1</span><span class="special">));</span>
+</pre>
+<p>
+          These conversions are also available for move-assignment.
+        </p>
+<p>
+          These conversions are not limited to the above generic protocol classes.
+          User-defined protocols may take advantage of this feature by similarly
+          ensuring the conversion from <code class="computeroutput"><span class="identifier">Protocol1</span></code>
+          to <code class="computeroutput"><span class="identifier">Protocol2</span></code> is valid,
+          as above.
+        </p>
+<h6>
+<a name="asio.overview.networking.other_protocols.h1"></a>
+          <span><a name="asio.overview.networking.other_protocols.accepting_generic_sockets"></a></span><a class="link" href="other_protocols.html#asio.overview.networking.other_protocols.accepting_generic_sockets">Accepting
+          Generic Sockets</a>
+        </h6>
+<p>
+          As a convenience, a socket acceptor's <code class="computeroutput"><span class="identifier">accept</span><span class="special">()</span></code> and <code class="computeroutput"><span class="identifier">async_accept</span><span class="special">()</span></code> functions can directly accept into a
+          different protocol's socket type, provided the corresponding protocol conversion
+          is valid. For example, the following is supported because the protocol
+          <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span></code> is convertible to <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">generic</span><span class="special">::</span><span class="identifier">stream_protocol</span></code>:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">acceptor</span> <span class="identifier">my_acceptor</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="special">...</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">generic</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">my_socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">my_acceptor</span><span class="special">.</span><span class="identifier">accept</span><span class="special">(</span><span class="identifier">my_socket</span><span class="special">);</span>
+</pre>
+<h6>
+<a name="asio.overview.networking.other_protocols.h2"></a>
+          <span><a name="asio.overview.networking.other_protocols.see_also"></a></span><a class="link" href="other_protocols.html#asio.overview.networking.other_protocols.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/generic__datagram_protocol.html" title="generic::datagram_protocol"><code class="computeroutput"><span class="identifier">generic</span><span class="special">::</span><span class="identifier">datagram_protocol</span></code></a>, <a class="link" href="../../reference/generic__raw_protocol.html" title="generic::raw_protocol"><code class="computeroutput"><span class="identifier">generic</span><span class="special">::</span><span class="identifier">raw_protocol</span></code></a>, <a class="link" href="../../reference/generic__seq_packet_protocol.html" title="generic::seq_packet_protocol"><code class="computeroutput"><span class="identifier">generic</span><span class="special">::</span><span class="identifier">seq_packet_protocol</span></code></a>, <a class="link" href="../../reference/generic__stream_protocol.html" title="generic::stream_protocol"><code class="computeroutput"><span class="identifier">generic</span><span class="special">::</span><span class="identifier">stream_protocol</span></code></a>, <a class="link" href="../../reference/Protocol.html" title="Protocol requirements">protocol
+          type requirements</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="protocols.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../networking.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="iostreams.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/networking/protocols.html

@@ -0,0 +1,201 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>TCP, UDP and ICMP</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../networking.html" title="Networking">
+<link rel="prev" href="../networking.html" title="Networking">
+<link rel="next" href="other_protocols.html" title="Support for Other Protocols">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../networking.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../networking.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="other_protocols.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.networking.protocols"></a><a class="link" href="protocols.html" title="TCP, UDP and ICMP">TCP, UDP and ICMP</a>
+</h4></div></div></div>
+<p>
+          Asio provides off-the-shelf support for the internet protocols TCP, UDP
+          and ICMP.
+        </p>
+<h6>
+<a name="asio.overview.networking.protocols.h0"></a>
+          <span><a name="asio.overview.networking.protocols.tcp_clients"></a></span><a class="link" href="protocols.html#asio.overview.networking.protocols.tcp_clients">TCP
+          Clients</a>
+        </h6>
+<p>
+          Hostname resolution is performed using a resolver, where host and service
+          names are looked up and converted into one or more endpoints:
+        </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span> <span class="identifier">resolver</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">query</span> <span class="identifier">query</span><span class="special">(</span><span class="string">"www.boost.org"</span><span class="special">,</span> <span class="string">"http"</span><span class="special">);</span>
+<span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">iter</span> <span class="special">=</span> <span class="identifier">resolver</span><span class="special">.</span><span class="identifier">resolve</span><span class="special">(</span><span class="identifier">query</span><span class="special">);</span>
+<span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">end</span><span class="special">;</span> <span class="comment">// End marker.</span>
+<span class="keyword">while</span> <span class="special">(</span><span class="identifier">iter</span> <span class="special">!=</span> <span class="identifier">end</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">endpoint</span> <span class="special">=</span> <span class="special">*</span><span class="identifier">iter</span><span class="special">++;</span>
+  <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">endpoint</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
+<span class="special">}</span>
+</pre>
+<p>
+          The list of endpoints obtained above could contain both IPv4 and IPv6 endpoints,
+          so a program should try each of them until it finds one that works. This
+          keeps the client program independent of a specific IP version.
+        </p>
+<p>
+          To simplify the development of protocol-independent programs, TCP clients
+          may establish connections using the free functions <a class="link" href="../../reference/connect.html" title="connect">connect()</a>
+          and <a class="link" href="../../reference/async_connect.html" title="async_connect">async_connect()</a>.
+          These operations try each endpoint in a list until the socket is successfully
+          connected. For example, a single call:
+        </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">connect</span><span class="special">(</span><span class="identifier">socket</span><span class="special">,</span> <span class="identifier">resolver</span><span class="special">.</span><span class="identifier">resolve</span><span class="special">(</span><span class="identifier">query</span><span class="special">));</span>
+</pre>
+<p>
+          will synchronously try all endpoints until one is successfully connected.
+          Similarly, an asynchronous connect may be performed by writing:
+        </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_connect</span><span class="special">(</span><span class="identifier">socket_</span><span class="special">,</span> <span class="identifier">iter</span><span class="special">,</span>
+    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">client</span><span class="special">::</span><span class="identifier">handle_connect</span><span class="special">,</span> <span class="keyword">this</span><span class="special">,</span>
+      <span class="identifier">asio</span><span class="special">::</span><span class="identifier">placeholders</span><span class="special">::</span><span class="identifier">error</span><span class="special">));</span>
+
+<span class="comment">// ...</span>
+
+<span class="keyword">void</span> <span class="identifier">handle_connect</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">error</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">error</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="comment">// Start read or write operations.</span>
+  <span class="special">}</span>
+  <span class="keyword">else</span>
+  <span class="special">{</span>
+    <span class="comment">// Handle error.</span>
+  <span class="special">}</span>
+<span class="special">}</span>
+</pre>
+<p>
+          When a specific endpoint is available, a socket can be created and connected:
+        </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">socket</span><span class="special">.</span><span class="identifier">connect</span><span class="special">(</span><span class="identifier">endpoint</span><span class="special">);</span>
+</pre>
+<p>
+          Data may be read from or written to a connected TCP socket using the <a class="link" href="../../reference/basic_stream_socket/receive.html" title="basic_stream_socket::receive">receive()</a>,
+          <a class="link" href="../../reference/basic_stream_socket/async_receive.html" title="basic_stream_socket::async_receive">async_receive()</a>,
+          <a class="link" href="../../reference/basic_stream_socket/send.html" title="basic_stream_socket::send">send()</a> or
+          <a class="link" href="../../reference/basic_stream_socket/async_send.html" title="basic_stream_socket::async_send">async_send()</a>
+          member functions. However, as these could result in <a class="link" href="../core/streams.html" title="Streams, Short Reads and Short Writes">short
+          writes or reads</a>, an application will typically use the following
+          operations instead: <a class="link" href="../../reference/read.html" title="read">read()</a>,
+          <a class="link" href="../../reference/async_read.html" title="async_read">async_read()</a>, <a class="link" href="../../reference/write.html" title="write">write()</a>
+          and <a class="link" href="../../reference/async_write.html" title="async_write">async_write()</a>.
+        </p>
+<h6>
+<a name="asio.overview.networking.protocols.h1"></a>
+          <span><a name="asio.overview.networking.protocols.tcp_servers"></a></span><a class="link" href="protocols.html#asio.overview.networking.protocols.tcp_servers">TCP
+          Servers</a>
+        </h6>
+<p>
+          A program uses an acceptor to accept incoming TCP connections:
+        </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">acceptor</span> <span class="identifier">acceptor</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">,</span> <span class="identifier">my_endpoint</span><span class="special">);</span>
+<span class="special">...</span>
+<span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">acceptor</span><span class="special">.</span><span class="identifier">accept</span><span class="special">(</span><span class="identifier">socket</span><span class="special">);</span>
+</pre>
+<p>
+          After a socket has been successfully accepted, it may be read from or written
+          to as illustrated for TCP clients above.
+        </p>
+<h6>
+<a name="asio.overview.networking.protocols.h2"></a>
+          <span><a name="asio.overview.networking.protocols.udp"></a></span><a class="link" href="protocols.html#asio.overview.networking.protocols.udp">UDP</a>
+        </h6>
+<p>
+          UDP hostname resolution is also performed using a resolver:
+        </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span> <span class="identifier">resolver</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">query</span> <span class="identifier">query</span><span class="special">(</span><span class="string">"localhost"</span><span class="special">,</span> <span class="string">"daytime"</span><span class="special">);</span>
+<span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">iter</span> <span class="special">=</span> <span class="identifier">resolver</span><span class="special">.</span><span class="identifier">resolve</span><span class="special">(</span><span class="identifier">query</span><span class="special">);</span>
+<span class="special">...</span>
+</pre>
+<p>
+          A UDP socket is typically bound to a local endpoint. The following code
+          will create an IP version 4 UDP socket and bind it to the "any"
+          address on port <code class="computeroutput"><span class="number">12345</span></code>:
+        </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">endpoint</span><span class="special">(</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">v4</span><span class="special">(),</span> <span class="number">12345</span><span class="special">);</span>
+<span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">,</span> <span class="identifier">endpoint</span><span class="special">);</span>
+</pre>
+<p>
+          Data may be read from or written to an unconnected UDP socket using the
+          <a class="link" href="../../reference/basic_datagram_socket/receive_from.html" title="basic_datagram_socket::receive_from">receive_from()</a>,
+          <a class="link" href="../../reference/basic_datagram_socket/async_receive_from.html" title="basic_datagram_socket::async_receive_from">async_receive_from()</a>,
+          <a class="link" href="../../reference/basic_datagram_socket/send_to.html" title="basic_datagram_socket::send_to">send_to()</a>
+          or <a class="link" href="../../reference/basic_datagram_socket/async_send_to.html" title="basic_datagram_socket::async_send_to">async_send_to()</a>
+          member functions. For a connected UDP socket, use the <a class="link" href="../../reference/basic_datagram_socket/receive.html" title="basic_datagram_socket::receive">receive()</a>,
+          <a class="link" href="../../reference/basic_datagram_socket/async_receive.html" title="basic_datagram_socket::async_receive">async_receive()</a>,
+          <a class="link" href="../../reference/basic_datagram_socket/send.html" title="basic_datagram_socket::send">send()</a>
+          or <a class="link" href="../../reference/basic_datagram_socket/async_send.html" title="basic_datagram_socket::async_send">async_send()</a>
+          member functions.
+        </p>
+<h6>
+<a name="asio.overview.networking.protocols.h3"></a>
+          <span><a name="asio.overview.networking.protocols.icmp"></a></span><a class="link" href="protocols.html#asio.overview.networking.protocols.icmp">ICMP</a>
+        </h6>
+<p>
+          As with TCP and UDP, ICMP hostname resolution is performed using a resolver:
+        </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">icmp</span><span class="special">::</span><span class="identifier">resolver</span> <span class="identifier">resolver</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">ip</span><span class="special">::</span><span class="identifier">icmp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">query</span> <span class="identifier">query</span><span class="special">(</span><span class="string">"localhost"</span><span class="special">,</span> <span class="string">""</span><span class="special">);</span>
+<span class="identifier">ip</span><span class="special">::</span><span class="identifier">icmp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">iter</span> <span class="special">=</span> <span class="identifier">resolver</span><span class="special">.</span><span class="identifier">resolve</span><span class="special">(</span><span class="identifier">query</span><span class="special">);</span>
+<span class="special">...</span>
+</pre>
+<p>
+          An ICMP socket may be bound to a local endpoint. The following code will
+          create an IP version 6 ICMP socket and bind it to the "any" address:
+        </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">icmp</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">endpoint</span><span class="special">(</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">icmp</span><span class="special">::</span><span class="identifier">v6</span><span class="special">(),</span> <span class="number">0</span><span class="special">);</span>
+<span class="identifier">ip</span><span class="special">::</span><span class="identifier">icmp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">,</span> <span class="identifier">endpoint</span><span class="special">);</span>
+</pre>
+<p>
+          The port number is not used for ICMP.
+        </p>
+<p>
+          Data may be read from or written to an unconnected ICMP socket using the
+          <a class="link" href="../../reference/basic_raw_socket/receive_from.html" title="basic_raw_socket::receive_from">receive_from()</a>,
+          <a class="link" href="../../reference/basic_raw_socket/async_receive_from.html" title="basic_raw_socket::async_receive_from">async_receive_from()</a>,
+          <a class="link" href="../../reference/basic_raw_socket/send_to.html" title="basic_raw_socket::send_to">send_to()</a>
+          or <a class="link" href="../../reference/basic_raw_socket/async_send_to.html" title="basic_raw_socket::async_send_to">async_send_to()</a>
+          member functions.
+        </p>
+<h6>
+<a name="asio.overview.networking.protocols.h4"></a>
+          <span><a name="asio.overview.networking.protocols.see_also"></a></span><a class="link" href="protocols.html#asio.overview.networking.protocols.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/ip__tcp.html" title="ip::tcp">ip::tcp</a>, <a class="link" href="../../reference/ip__udp.html" title="ip::udp">ip::udp</a>,
+          <a class="link" href="../../reference/ip__icmp.html" title="ip::icmp">ip::icmp</a>, <a class="link" href="../../tutorial/tutdaytime1.html" title="Daytime.1 - A synchronous TCP daytime client">daytime
+          protocol tutorials</a>, <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.icmp">ICMP
+          ping example</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../networking.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../networking.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="other_protocols.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/pipes.html

@@ -0,0 +1,66 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Pipes</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="files.html" title="Files">
+<link rel="next" href="serial_ports.html" title="Serial Ports">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="files.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="serial_ports.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.pipes"></a><a class="link" href="pipes.html" title="Pipes">Pipes</a>
+</h3></div></div></div>
+<p>
+        Asio provides support for portable anonymous pipes on POSIX and Windows (when
+        I/O completion ports are available). For example, to create and use a connected
+        pair of pipe objects:
+      </p>
+<pre class="programlisting"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">readable_pipe</span> <span class="identifier">read_end</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">writable_pipe</span> <span class="identifier">write_end</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">connect_pipe</span><span class="special">(</span><span class="identifier">read_end</span><span class="special">,</span> <span class="identifier">write_end</span><span class="special">);</span>
+
+<span class="identifier">write_end</span><span class="special">.</span><span class="identifier">async_write_some</span><span class="special">(</span><span class="identifier">my_write_buffer</span><span class="special">,</span>
+    <span class="special">[](</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="comment">// ...</span>
+    <span class="special">});</span>
+
+<span class="identifier">read_end</span><span class="special">.</span><span class="identifier">async_read_some</span><span class="special">(</span><span class="identifier">my_read_buffer</span><span class="special">,</span>
+    <span class="special">[](</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">e</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">)</span>
+    <span class="special">{</span>
+      <span class="comment">// ...</span>
+    <span class="special">});</span>
+</pre>
+<h5>
+<a name="asio.overview.pipes.h0"></a>
+        <span><a name="asio.overview.pipes.see_also"></a></span><a class="link" href="pipes.html#asio.overview.pipes.see_also">See
+        Also</a>
+      </h5>
+<p>
+        <a class="link" href="../reference/basic_readable_pipe.html" title="basic_readable_pipe">basic_readable_pipe</a>,
+        <a class="link" href="../reference/basic_writable_pipe.html" title="basic_writable_pipe">basic_writable_pipe</a>,
+        <a class="link" href="../reference/connect_pipe.html" title="connect_pipe">connect_pipe</a>, <a class="link" href="../reference/readable_pipe.html" title="readable_pipe">readable_pipe</a>,
+        <a class="link" href="../reference/writable_pipe.html" title="writable_pipe">writable_pipe</a>.
+      </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="files.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="serial_ports.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/posix.html

@@ -0,0 +1,44 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>POSIX-Specific Functionality</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="channels.html" title="Channels">
+<link rel="next" href="posix/local.html" title="UNIX Domain Sockets">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="channels.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="posix/local.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.posix"></a><a class="link" href="posix.html" title="POSIX-Specific Functionality">POSIX-Specific Functionality</a>
+</h3></div></div></div>
+<p>
+        <a class="link" href="posix/local.html" title="UNIX Domain Sockets">UNIX Domain Sockets</a>
+      </p>
+<p>
+        <a class="link" href="posix/stream_descriptor.html" title="Stream-Oriented File Descriptors">Stream-Oriented File
+        Descriptors</a>
+      </p>
+<p>
+        <a class="link" href="posix/fork.html" title="Fork">Fork</a>
+      </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="channels.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="posix/local.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/posix/fork.html

@@ -0,0 +1,74 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Fork</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../posix.html" title="POSIX-Specific Functionality">
+<link rel="prev" href="stream_descriptor.html" title="Stream-Oriented File Descriptors">
+<link rel="next" href="../windows.html" title="Windows-Specific Functionality">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="stream_descriptor.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../posix.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../windows.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.posix.fork"></a><a class="link" href="fork.html" title="Fork">Fork</a>
+</h4></div></div></div>
+<p>
+          Asio supports programs that utilise the <code class="computeroutput"><span class="identifier">fork</span><span class="special">()</span></code> system call. Provided the program calls
+          <code class="computeroutput"><span class="identifier">io_context</span><span class="special">.</span><span class="identifier">notify_fork</span><span class="special">()</span></code>
+          at the appropriate times, Asio will recreate any internal file descriptors
+          (such as the "self-pipe trick" descriptor used for waking up
+          a reactor). The notification is usually performed as follows:
+        </p>
+<pre class="programlisting"><span class="identifier">io_context_</span><span class="special">.</span><span class="identifier">notify_fork</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">fork_prepare</span><span class="special">);</span>
+<span class="keyword">if</span> <span class="special">(</span><span class="identifier">fork</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="identifier">io_context_</span><span class="special">.</span><span class="identifier">notify_fork</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">fork_child</span><span class="special">);</span>
+  <span class="special">...</span>
+<span class="special">}</span>
+<span class="keyword">else</span>
+<span class="special">{</span>
+  <span class="identifier">io_context_</span><span class="special">.</span><span class="identifier">notify_fork</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">fork_parent</span><span class="special">);</span>
+  <span class="special">...</span>
+<span class="special">}</span>
+</pre>
+<p>
+          User-defined services can also be made fork-aware by overriding the <code class="computeroutput"><span class="identifier">io_context</span><span class="special">::</span><span class="identifier">service</span><span class="special">::</span><span class="identifier">notify_fork</span><span class="special">()</span></code>
+          virtual function.
+        </p>
+<p>
+          Note that any file descriptors accessible via Asio's public API (e.g. the
+          descriptors underlying <code class="computeroutput"><span class="identifier">basic_socket</span><span class="special">&lt;&gt;</span></code>, <code class="computeroutput"><span class="identifier">posix</span><span class="special">::</span><span class="identifier">stream_descriptor</span></code>,
+          etc.) are not altered during a fork. It is the program's responsibility
+          to manage these as required.
+        </p>
+<h6>
+<a name="asio.overview.posix.fork.h0"></a>
+          <span><a name="asio.overview.posix.fork.see_also"></a></span><a class="link" href="fork.html#asio.overview.posix.fork.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/io_context/notify_fork.html" title="io_context::notify_fork">io_context::notify_fork()</a>,
+          <a class="link" href="../../reference/io_context/fork_event.html" title="io_context::fork_event">io_context::fork_event</a>,
+          <a class="link" href="../../reference/execution_context__service/notify_fork.html" title="execution_context::service::notify_fork">io_context::service::notify_fork()</a>,
+          <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.fork">Fork examples</a>.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="stream_descriptor.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../posix.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../windows.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/posix/local.html

@@ -0,0 +1,101 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>UNIX Domain Sockets</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../posix.html" title="POSIX-Specific Functionality">
+<link rel="prev" href="../posix.html" title="POSIX-Specific Functionality">
+<link rel="next" href="stream_descriptor.html" title="Stream-Oriented File Descriptors">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../posix.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../posix.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="stream_descriptor.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.posix.local"></a><a class="link" href="local.html" title="UNIX Domain Sockets">UNIX Domain Sockets</a>
+</h4></div></div></div>
+<p>
+          Asio provides basic support for UNIX domain sockets (also known as local
+          sockets). The simplest use involves creating a pair of connected sockets.
+          The following code:
+        </p>
+<pre class="programlisting"><span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket1</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket2</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">local</span><span class="special">::</span><span class="identifier">connect_pair</span><span class="special">(</span><span class="identifier">socket1</span><span class="special">,</span> <span class="identifier">socket2</span><span class="special">);</span>
+</pre>
+<p>
+          will create a pair of stream-oriented sockets. To do the same for datagram-oriented
+          sockets, use:
+        </p>
+<pre class="programlisting"><span class="identifier">local</span><span class="special">::</span><span class="identifier">datagram_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket1</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">local</span><span class="special">::</span><span class="identifier">datagram_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket2</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">local</span><span class="special">::</span><span class="identifier">connect_pair</span><span class="special">(</span><span class="identifier">socket1</span><span class="special">,</span> <span class="identifier">socket2</span><span class="special">);</span>
+</pre>
+<p>
+          A UNIX domain socket server may be created by binding an acceptor to an
+          endpoint, in much the same way as one does for a TCP server:
+        </p>
+<pre class="programlisting"><span class="special">::</span><span class="identifier">unlink</span><span class="special">(</span><span class="string">"/tmp/foobar"</span><span class="special">);</span> <span class="comment">// Remove previous binding.</span>
+<span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">ep</span><span class="special">(</span><span class="string">"/tmp/foobar"</span><span class="special">);</span>
+<span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">acceptor</span> <span class="identifier">acceptor</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">,</span> <span class="identifier">ep</span><span class="special">);</span>
+<span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">acceptor</span><span class="special">.</span><span class="identifier">accept</span><span class="special">(</span><span class="identifier">socket</span><span class="special">);</span>
+</pre>
+<p>
+          A client that connects to this server might look like:
+        </p>
+<pre class="programlisting"><span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">ep</span><span class="special">(</span><span class="string">"/tmp/foobar"</span><span class="special">);</span>
+<span class="identifier">local</span><span class="special">::</span><span class="identifier">stream_protocol</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">socket</span><span class="special">.</span><span class="identifier">connect</span><span class="special">(</span><span class="identifier">ep</span><span class="special">);</span>
+</pre>
+<p>
+          Transmission of file descriptors or credentials across UNIX domain sockets
+          is not directly supported within Asio, but may be achieved by accessing
+          the socket's underlying descriptor using the <a class="link" href="../../reference/basic_socket/native_handle.html" title="basic_socket::native_handle">native_handle()</a>
+          member function.
+        </p>
+<h6>
+<a name="asio.overview.posix.local.h0"></a>
+          <span><a name="asio.overview.posix.local.see_also"></a></span><a class="link" href="local.html#asio.overview.posix.local.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/local__connect_pair.html" title="local::connect_pair">local::connect_pair</a>,
+          <a class="link" href="../../reference/local__datagram_protocol.html" title="local::datagram_protocol">local::datagram_protocol</a>,
+          <a class="link" href="../../reference/local__datagram_protocol/endpoint.html" title="local::datagram_protocol::endpoint">local::datagram_protocol::endpoint</a>,
+          <a class="link" href="../../reference/local__datagram_protocol/socket.html" title="local::datagram_protocol::socket">local::datagram_protocol::socket</a>,
+          <a class="link" href="../../reference/local__stream_protocol.html" title="local::stream_protocol">local::stream_protocol</a>,
+          <a class="link" href="../../reference/local__stream_protocol/acceptor.html" title="local::stream_protocol::acceptor">local::stream_protocol::acceptor</a>,
+          <a class="link" href="../../reference/local__stream_protocol/endpoint.html" title="local::stream_protocol::endpoint">local::stream_protocol::endpoint</a>,
+          <a class="link" href="../../reference/local__stream_protocol/iostream.html" title="local::stream_protocol::iostream">local::stream_protocol::iostream</a>,
+          <a class="link" href="../../reference/local__stream_protocol/socket.html" title="local::stream_protocol::socket">local::stream_protocol::socket</a>,
+          <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.unix_domain_sockets">UNIX domain
+          sockets examples</a>.
+        </p>
+<h6>
+<a name="asio.overview.posix.local.h1"></a>
+          <span><a name="asio.overview.posix.local.notes"></a></span><a class="link" href="local.html#asio.overview.posix.local.notes">Notes</a>
+        </h6>
+<p>
+          UNIX domain sockets are only available at compile time if supported by
+          the target operating system. A program may test for the macro <code class="computeroutput"><span class="identifier">ASIO_HAS_LOCAL_SOCKETS</span></code> to determine whether
+          they are supported.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../posix.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../posix.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="stream_descriptor.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/posix/stream_descriptor.html

@@ -0,0 +1,83 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Stream-Oriented File Descriptors</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../posix.html" title="POSIX-Specific Functionality">
+<link rel="prev" href="local.html" title="UNIX Domain Sockets">
+<link rel="next" href="fork.html" title="Fork">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="local.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../posix.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="fork.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.posix.stream_descriptor"></a><a class="link" href="stream_descriptor.html" title="Stream-Oriented File Descriptors">Stream-Oriented
+        File Descriptors</a>
+</h4></div></div></div>
+<p>
+          Asio includes classes added to permit synchronous and asynchronous read
+          and write operations to be performed on POSIX file descriptors, such as
+          pipes, standard input and output, and various devices.
+        </p>
+<p>
+          These classes also provide limited support for regular files. This support
+          assumes that the underlying read and write operations provided by the operating
+          system never fail with <code class="computeroutput"><span class="identifier">EAGAIN</span></code>
+          or <code class="computeroutput"><span class="identifier">EWOULDBLOCK</span></code>. (This assumption
+          normally holds for buffered file I/O.) Synchronous and asynchronous read
+          and write operations on file descriptors will succeed but the I/O will
+          always be performed immediately. Wait operations, and operations involving
+          <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">null_buffers</span></code>, are not portably supported.
+        </p>
+<p>
+          For example, to perform read and write operations on standard input and
+          output, the following objects may be created:
+        </p>
+<pre class="programlisting"><span class="identifier">posix</span><span class="special">::</span><span class="identifier">stream_descriptor</span> <span class="identifier">in</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">,</span> <span class="special">::</span><span class="identifier">dup</span><span class="special">(</span><span class="identifier">STDIN_FILENO</span><span class="special">));</span>
+<span class="identifier">posix</span><span class="special">::</span><span class="identifier">stream_descriptor</span> <span class="identifier">out</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">,</span> <span class="special">::</span><span class="identifier">dup</span><span class="special">(</span><span class="identifier">STDOUT_FILENO</span><span class="special">));</span>
+</pre>
+<p>
+          These are then used as synchronous or asynchronous read and write streams.
+          This means the objects can be used with any of the <a class="link" href="../../reference/read.html" title="read">read()</a>,
+          <a class="link" href="../../reference/async_read.html" title="async_read">async_read()</a>, <a class="link" href="../../reference/write.html" title="write">write()</a>,
+          <a class="link" href="../../reference/async_write.html" title="async_write">async_write()</a>, <a class="link" href="../../reference/read_until.html" title="read_until">read_until()</a> or <a class="link" href="../../reference/async_read_until.html" title="async_read_until">async_read_until()</a>
+          free functions.
+        </p>
+<h6>
+<a name="asio.overview.posix.stream_descriptor.h0"></a>
+          <span><a name="asio.overview.posix.stream_descriptor.see_also"></a></span><a class="link" href="stream_descriptor.html#asio.overview.posix.stream_descriptor.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/posix__stream_descriptor.html" title="posix::stream_descriptor">posix::stream_descriptor</a>,
+          <a class="link" href="../../examples/cpp03_examples.html#asio.examples.cpp03_examples.chat">Chat example (C++03)</a>,
+          <a class="link" href="../../examples/cpp11_examples.html#asio.examples.cpp11_examples.chat">Chat example (C++11)</a>.
+        </p>
+<h6>
+<a name="asio.overview.posix.stream_descriptor.h1"></a>
+          <span><a name="asio.overview.posix.stream_descriptor.notes"></a></span><a class="link" href="stream_descriptor.html#asio.overview.posix.stream_descriptor.notes">Notes</a>
+        </h6>
+<p>
+          POSIX stream descriptors are only available at compile time if supported
+          by the target operating system. A program may test for the macro <code class="computeroutput"><span class="identifier">ASIO_HAS_POSIX_STREAM_DESCRIPTOR</span></code> to determine
+          whether they are supported.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="local.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../posix.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="fork.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/rationale.html

@@ -0,0 +1,94 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Rationale</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="../overview.html" title="Overview">
+<link rel="next" href="basics.html" title="Basic Asio Anatomy">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../overview.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="basics.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.rationale"></a><a class="link" href="rationale.html" title="Rationale">Rationale</a>
+</h3></div></div></div>
+<p>
+        Most programs interact with the outside world in some way, whether it be
+        via a file, a network, a serial cable, or the console. Sometimes, as is the
+        case with networking, individual I/O operations can take a long time to complete.
+        This poses particular challenges to application development.
+      </p>
+<p>
+        Asio provides the tools to manage these long running operations, without
+        requiring programs to use concurrency models based on threads and explicit
+        locking.
+      </p>
+<p>
+        The Asio library is intended for programmers using C++ for systems programming,
+        where access to operating system functionality such as networking is often
+        required. In particular, Asio addresses the following goals:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <span class="bold"><strong>Portability.</strong></span> The library should support
+            a range of commonly used operating systems, and provide consistent behaviour
+            across these operating systems.
+          </li>
+<li class="listitem">
+            <span class="bold"><strong>Scalability.</strong></span> The library should facilitate
+            the development of network applications that scale to thousands of concurrent
+            connections. The library implementation for each operating system should
+            use the mechanism that best enables this scalability.
+          </li>
+<li class="listitem">
+            <span class="bold"><strong>Efficiency.</strong></span> The library should support
+            techniques such as scatter-gather I/O, and allow programs to minimise
+            data copying.
+          </li>
+<li class="listitem">
+            <span class="bold"><strong>Model concepts from established APIs, such as BSD
+            sockets.</strong></span> The BSD socket API is widely implemented and understood,
+            and is covered in much literature. Other programming languages often
+            use a similar interface for networking APIs. As far as is reasonable,
+            Asio should leverage existing practice.
+          </li>
+<li class="listitem">
+            <span class="bold"><strong>Ease of use.</strong></span> The library should provide
+            a lower entry barrier for new users by taking a toolkit, rather than
+            framework, approach. That is, it should try to minimise the up-front
+            investment in time to just learning a few basic rules and guidelines.
+            After that, a library user should only need to understand the specific
+            functions that are being used.
+          </li>
+<li class="listitem">
+            <span class="bold"><strong>Basis for further abstraction.</strong></span> The library
+            should permit the development of other libraries that provide higher
+            levels of abstraction. For example, implementations of commonly used
+            protocols such as HTTP.
+          </li>
+</ul></div>
+<p>
+        Although Asio started life focused primarily on networking, its concepts
+        of asynchronous I/O have been extended to include other operating system
+        resources such as serial ports, file descriptors, and so on.
+      </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="../overview.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="basics.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/serial_ports.html

@@ -0,0 +1,81 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Serial Ports</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="pipes.html" title="Pipes">
+<link rel="next" href="signals.html" title="Signal Handling">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="pipes.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="signals.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.serial_ports"></a><a class="link" href="serial_ports.html" title="Serial Ports">Serial Ports</a>
+</h3></div></div></div>
+<p>
+        Asio includes classes for creating and manipulating serial ports in a portable
+        manner. For example, a serial port may be opened using:
+      </p>
+<pre class="programlisting"><span class="identifier">serial_port</span> <span class="identifier">port</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">,</span> <span class="identifier">name</span><span class="special">);</span>
+</pre>
+<p>
+        where name is something like <code class="computeroutput"><span class="string">"COM1"</span></code>
+        on Windows, and <code class="computeroutput"><span class="string">"/dev/ttyS0"</span></code>
+        on POSIX platforms.
+      </p>
+<p>
+        Once opened, the serial port may be used as a <a class="link" href="core/streams.html" title="Streams, Short Reads and Short Writes">stream</a>.
+        This means the objects can be used with any of the <a class="link" href="../reference/read.html" title="read">read()</a>,
+        <a class="link" href="../reference/async_read.html" title="async_read">async_read()</a>, <a class="link" href="../reference/write.html" title="write">write()</a>,
+        <a class="link" href="../reference/async_write.html" title="async_write">async_write()</a>, <a class="link" href="../reference/read_until.html" title="read_until">read_until()</a>
+        or <a class="link" href="../reference/async_read_until.html" title="async_read_until">async_read_until()</a>
+        free functions.
+      </p>
+<p>
+        The serial port implementation also includes option classes for configuring
+        the port's baud rate, flow control type, parity, stop bits and character
+        size.
+      </p>
+<h5>
+<a name="asio.overview.serial_ports.h0"></a>
+        <span><a name="asio.overview.serial_ports.see_also"></a></span><a class="link" href="serial_ports.html#asio.overview.serial_ports.see_also">See
+        Also</a>
+      </h5>
+<p>
+        <a class="link" href="../reference/serial_port.html" title="serial_port">serial_port</a>, <a class="link" href="../reference/serial_port_base.html" title="serial_port_base">serial_port_base</a>,
+        <a class="link" href="../reference/serial_port_base__baud_rate.html" title="serial_port_base::baud_rate">serial_port_base::baud_rate</a>,
+        <a class="link" href="../reference/serial_port_base__flow_control.html" title="serial_port_base::flow_control">serial_port_base::flow_control</a>,
+        <a class="link" href="../reference/serial_port_base__parity.html" title="serial_port_base::parity">serial_port_base::parity</a>,
+        <a class="link" href="../reference/serial_port_base__stop_bits.html" title="serial_port_base::stop_bits">serial_port_base::stop_bits</a>,
+        <a class="link" href="../reference/serial_port_base__character_size.html" title="serial_port_base::character_size">serial_port_base::character_size</a>.
+      </p>
+<h5>
+<a name="asio.overview.serial_ports.h1"></a>
+        <span><a name="asio.overview.serial_ports.notes"></a></span><a class="link" href="serial_ports.html#asio.overview.serial_ports.notes">Notes</a>
+      </h5>
+<p>
+        Serial ports are available on all POSIX platforms. For Windows, serial ports
+        are only available at compile time when the I/O completion port backend is
+        used (which is the default). A program may test for the macro <code class="computeroutput"><span class="identifier">ASIO_HAS_SERIAL_PORT</span></code> to determine whether
+        they are supported.
+      </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="pipes.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="signals.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/signals.html

@@ -0,0 +1,73 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Signal Handling</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="serial_ports.html" title="Serial Ports">
+<link rel="next" href="channels.html" title="Channels">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="serial_ports.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="channels.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.signals"></a><a class="link" href="signals.html" title="Signal Handling">Signal Handling</a>
+</h3></div></div></div>
+<p>
+        Asio supports signal handling using a class called <a class="link" href="../reference/signal_set.html" title="signal_set">signal_set</a>.
+        Programs may add one or more signals to the set, and then perform an <code class="computeroutput"><span class="identifier">async_wait</span><span class="special">()</span></code>
+        operation. The specified handler will be called when one of the signals occurs.
+        The same signal number may be registered with multiple <a class="link" href="../reference/signal_set.html" title="signal_set">signal_set</a>
+        objects, however the signal number must be used only with Asio.
+      </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span>
+    <span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">error</span><span class="special">,</span>
+    <span class="keyword">int</span> <span class="identifier">signal_number</span><span class="special">)</span>
+<span class="special">{</span>
+  <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">error</span><span class="special">)</span>
+  <span class="special">{</span>
+    <span class="comment">// A signal occurred.</span>
+  <span class="special">}</span>
+<span class="special">}</span>
+
+<span class="special">...</span>
+
+<span class="comment">// Construct a signal set registered for process termination.</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">signal_set</span> <span class="identifier">signals</span><span class="special">(</span><span class="identifier">io_context</span><span class="special">,</span> <span class="identifier">SIGINT</span><span class="special">,</span> <span class="identifier">SIGTERM</span><span class="special">);</span>
+
+<span class="comment">// Start an asynchronous wait for one of the signals to occur.</span>
+<span class="identifier">signals</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">handler</span><span class="special">);</span>
+</pre>
+<p>
+        Signal handling also works on Windows, as the Microsoft Visual C++ runtime
+        library maps console events like Ctrl+C to the equivalent signal.
+      </p>
+<h5>
+<a name="asio.overview.signals.h0"></a>
+        <span><a name="asio.overview.signals.see_also"></a></span><a class="link" href="signals.html#asio.overview.signals.see_also">See
+        Also</a>
+      </h5>
+<p>
+        <a class="link" href="../reference/signal_set.html" title="signal_set">signal_set</a>, <a class="link" href="../examples/cpp03_examples.html#asio.examples.cpp03_examples.http_server">HTTP
+        server example (C++03)</a>, <a class="link" href="../examples/cpp11_examples.html#asio.examples.cpp11_examples.http_server">HTTP
+        server example (C++11)</a>.
+      </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="serial_ports.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="channels.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/ssl.html

@@ -0,0 +1,185 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>SSL</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="windows/object_handle.html" title="Object HANDLEs">
+<link rel="next" href="cpp2011.html" title="C++ 2011 Support">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="windows/object_handle.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="cpp2011.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.ssl"></a><a class="link" href="ssl.html" title="SSL">SSL</a>
+</h3></div></div></div>
+<p>
+        Asio contains classes and class templates for basic SSL support. These classes
+        allow encrypted communication to be layered on top of an existing stream,
+        such as a TCP socket.
+      </p>
+<p>
+        Before creating an encrypted stream, an application must construct an SSL
+        context object. This object is used to set SSL options such as verification
+        mode, certificate files, and so on. As an illustration, client-side initialisation
+        may look something like:
+      </p>
+<pre class="programlisting"><span class="identifier">ssl</span><span class="special">::</span><span class="identifier">context</span> <span class="identifier">ctx</span><span class="special">(</span><span class="identifier">ssl</span><span class="special">::</span><span class="identifier">context</span><span class="special">::</span><span class="identifier">sslv23</span><span class="special">);</span>
+<span class="identifier">ctx</span><span class="special">.</span><span class="identifier">set_verify_mode</span><span class="special">(</span><span class="identifier">ssl</span><span class="special">::</span><span class="identifier">verify_peer</span><span class="special">);</span>
+<span class="identifier">ctx</span><span class="special">.</span><span class="identifier">load_verify_file</span><span class="special">(</span><span class="string">"ca.pem"</span><span class="special">);</span>
+</pre>
+<p>
+        To use SSL with a TCP socket, one may write:
+      </p>
+<pre class="programlisting"><span class="identifier">ssl</span><span class="special">::</span><span class="identifier">stream</span><span class="special">&lt;</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&gt;</span> <span class="identifier">ssl_sock</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">,</span> <span class="identifier">ctx</span><span class="special">);</span>
+</pre>
+<p>
+        To perform socket-specific operations, such as establishing an outbound connection
+        or accepting an incoming one, the underlying socket must first be obtained
+        using the <code class="computeroutput"><span class="identifier">ssl</span><span class="special">::</span><span class="identifier">stream</span></code> template's <a class="link" href="../reference/ssl__stream/lowest_layer.html" title="ssl::stream::lowest_layer"><code class="computeroutput"><span class="identifier">lowest_layer</span><span class="special">()</span></code></a>
+        member function:
+      </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">::</span><span class="identifier">lowest_layer_type</span><span class="special">&amp;</span> <span class="identifier">sock</span> <span class="special">=</span> <span class="identifier">ssl_sock</span><span class="special">.</span><span class="identifier">lowest_layer</span><span class="special">();</span>
+<span class="identifier">sock</span><span class="special">.</span><span class="identifier">connect</span><span class="special">(</span><span class="identifier">my_endpoint</span><span class="special">);</span>
+</pre>
+<p>
+        In some use cases the underlying stream object will need to have a longer
+        lifetime than the SSL stream, in which case the template parameter should
+        be a reference to the stream type:
+      </p>
+<pre class="programlisting"><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">sock</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">);</span>
+<span class="identifier">ssl</span><span class="special">::</span><span class="identifier">stream</span><span class="special">&lt;</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&amp;&gt;</span> <span class="identifier">ssl_sock</span><span class="special">(</span><span class="identifier">sock</span><span class="special">,</span> <span class="identifier">ctx</span><span class="special">);</span>
+</pre>
+<p>
+        SSL handshaking must be performed prior to transmitting or receiving data
+        over an encrypted connection. This is accomplished using the <code class="computeroutput"><span class="identifier">ssl</span><span class="special">::</span><span class="identifier">stream</span></code>
+        template's <a class="link" href="../reference/ssl__stream/handshake.html" title="ssl::stream::handshake">handshake()</a>
+        or <a class="link" href="../reference/ssl__stream/async_handshake.html" title="ssl::stream::async_handshake">async_handshake()</a>
+        member functions.
+      </p>
+<p>
+        Once connected, SSL stream objects are used as synchronous or asynchronous
+        read and write streams. This means the objects can be used with any of the
+        <a class="link" href="../reference/read.html" title="read">read()</a>, <a class="link" href="../reference/async_read.html" title="async_read">async_read()</a>,
+        <a class="link" href="../reference/write.html" title="write">write()</a>, <a class="link" href="../reference/async_write.html" title="async_write">async_write()</a>,
+        <a class="link" href="../reference/read_until.html" title="read_until">read_until()</a> or <a class="link" href="../reference/async_read_until.html" title="async_read_until">async_read_until()</a>
+        free functions.
+      </p>
+<h5>
+<a name="asio.overview.ssl.h0"></a>
+        <span><a name="asio.overview.ssl.certificate_verification"></a></span><a class="link" href="ssl.html#asio.overview.ssl.certificate_verification">Certificate
+        Verification</a>
+      </h5>
+<p>
+        Asio provides various methods for configuring the way SSL certificates are
+        verified:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+            <a class="link" href="../reference/ssl__context/set_default_verify_paths.html" title="ssl::context::set_default_verify_paths">ssl::context::set_default_verify_paths()</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="../reference/ssl__context/set_verify_mode.html" title="ssl::context::set_verify_mode">ssl::context::set_verify_mode()</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="../reference/ssl__context/set_verify_callback.html" title="ssl::context::set_verify_callback">ssl::context::set_verify_callback()</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="../reference/ssl__context/load_verify_file.html" title="ssl::context::load_verify_file">ssl::context::load_verify_file()</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="../reference/ssl__stream/set_verify_mode.html" title="ssl::stream::set_verify_mode">ssl::stream::set_verify_mode()</a>
+          </li>
+<li class="listitem">
+            <a class="link" href="../reference/ssl__stream/set_verify_callback.html" title="ssl::stream::set_verify_callback">ssl::stream::set_verify_callback()</a>
+          </li>
+</ul></div>
+<p>
+        To simplify use cases where certificates are verified according to the rules
+        in RFC 6125 (identity verification in the context of Transport Layer Security),
+        Asio provides a reusable verification callback as a function object:
+      </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
+            <a class="link" href="../reference/ssl__host_name_verification.html" title="ssl::host_name_verification">ssl::host_name_verification</a>
+          </li></ul></div>
+<p>
+        The following example shows verification of a remote host's certificate according
+        to the rules used by HTTPS:
+      </p>
+<pre class="programlisting"><span class="keyword">using</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">;</span>
+<span class="keyword">namespace</span> <span class="identifier">ssl</span> <span class="special">=</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">ssl</span><span class="special">;</span>
+<span class="keyword">typedef</span> <span class="identifier">ssl</span><span class="special">::</span><span class="identifier">stream</span><span class="special">&lt;</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&gt;</span> <span class="identifier">ssl_socket</span><span class="special">;</span>
+
+<span class="comment">// Create a context that uses the default paths for</span>
+<span class="comment">// finding CA certificates.</span>
+<span class="identifier">ssl</span><span class="special">::</span><span class="identifier">context</span> <span class="identifier">ctx</span><span class="special">(</span><span class="identifier">ssl</span><span class="special">::</span><span class="identifier">context</span><span class="special">::</span><span class="identifier">sslv23</span><span class="special">);</span>
+<span class="identifier">ctx</span><span class="special">.</span><span class="identifier">set_default_verify_paths</span><span class="special">();</span>
+
+<span class="comment">// Open a socket and connect it to the remote host.</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span> <span class="identifier">io_context</span><span class="special">;</span>
+<span class="identifier">ssl_socket</span> <span class="identifier">sock</span><span class="special">(</span><span class="identifier">io_context</span><span class="special">,</span> <span class="identifier">ctx</span><span class="special">);</span>
+<span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span> <span class="identifier">resolver</span><span class="special">(</span><span class="identifier">io_context</span><span class="special">);</span>
+<span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">query</span> <span class="identifier">query</span><span class="special">(</span><span class="string">"host.name"</span><span class="special">,</span> <span class="string">"https"</span><span class="special">);</span>
+<span class="identifier">asio</span><span class="special">::</span><span class="identifier">connect</span><span class="special">(</span><span class="identifier">sock</span><span class="special">.</span><span class="identifier">lowest_layer</span><span class="special">(),</span> <span class="identifier">resolver</span><span class="special">.</span><span class="identifier">resolve</span><span class="special">(</span><span class="identifier">query</span><span class="special">));</span>
+<span class="identifier">sock</span><span class="special">.</span><span class="identifier">lowest_layer</span><span class="special">().</span><span class="identifier">set_option</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">no_delay</span><span class="special">(</span><span class="keyword">true</span><span class="special">));</span>
+
+<span class="comment">// Perform SSL handshake and verify the remote host's</span>
+<span class="comment">// certificate.</span>
+<span class="identifier">sock</span><span class="special">.</span><span class="identifier">set_verify_mode</span><span class="special">(</span><span class="identifier">ssl</span><span class="special">::</span><span class="identifier">verify_peer</span><span class="special">);</span>
+<span class="identifier">sock</span><span class="special">.</span><span class="identifier">set_verify_callback</span><span class="special">(</span><span class="identifier">ssl</span><span class="special">::</span><span class="identifier">host_name_verification</span><span class="special">(</span><span class="string">"host.name"</span><span class="special">));</span>
+<span class="identifier">sock</span><span class="special">.</span><span class="identifier">handshake</span><span class="special">(</span><span class="identifier">ssl_socket</span><span class="special">::</span><span class="identifier">client</span><span class="special">);</span>
+
+<span class="comment">// ... read and write as normal ...</span>
+</pre>
+<h5>
+<a name="asio.overview.ssl.h1"></a>
+        <span><a name="asio.overview.ssl.ssl_and_threads"></a></span><a class="link" href="ssl.html#asio.overview.ssl.ssl_and_threads">SSL
+        and Threads</a>
+      </h5>
+<p>
+        SSL stream objects perform no locking of their own. Therefore, it is essential
+        that all asynchronous SSL operations are performed in an implicit or explicit
+        <a class="link" href="core/strands.html" title="Strands: Use Threads Without Explicit Locking">strand</a>. Note that this
+        means that no synchronisation is required (and so no locking overhead is
+        incurred) in single threaded programs.
+      </p>
+<h5>
+<a name="asio.overview.ssl.h2"></a>
+        <span><a name="asio.overview.ssl.see_also"></a></span><a class="link" href="ssl.html#asio.overview.ssl.see_also">See
+        Also</a>
+      </h5>
+<p>
+        <a class="link" href="../reference/ssl__context.html" title="ssl::context">ssl::context</a>, <a class="link" href="../reference/ssl__host_name_verification.html" title="ssl::host_name_verification">ssl::host_name_verification</a>,
+        <a class="link" href="../reference/ssl__stream.html" title="ssl::stream">ssl::stream</a>, <a class="link" href="../examples/cpp03_examples.html#asio.examples.cpp03_examples.ssl">SSL
+        example (C++03)</a>, <a class="link" href="../examples/cpp11_examples.html#asio.examples.cpp11_examples.ssl">SSL
+        example (C++11)</a>.
+      </p>
+<h5>
+<a name="asio.overview.ssl.h3"></a>
+        <span><a name="asio.overview.ssl.notes"></a></span><a class="link" href="ssl.html#asio.overview.ssl.notes">Notes</a>
+      </h5>
+<p>
+        <a href="http://www.openssl.org" target="_top">OpenSSL</a> is required to make use
+        of Asio's SSL support. When an application needs to use OpenSSL functionality
+        that is not wrapped by Asio, the underlying OpenSSL types may be obtained
+        by calling <a class="link" href="../reference/ssl__context/native_handle.html" title="ssl::context::native_handle"><code class="computeroutput"><span class="identifier">ssl</span><span class="special">::</span><span class="identifier">context</span><span class="special">::</span><span class="identifier">native_handle</span><span class="special">()</span></code></a> or <a class="link" href="../reference/ssl__stream/native_handle.html" title="ssl::stream::native_handle"><code class="computeroutput"><span class="identifier">ssl</span><span class="special">::</span><span class="identifier">stream</span><span class="special">::</span><span class="identifier">native_handle</span><span class="special">()</span></code></a>.
+      </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="windows/object_handle.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="cpp2011.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/timers.html

@@ -0,0 +1,86 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Timers</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="networking/bsd_sockets.html" title="The BSD Socket API and Asio">
+<link rel="next" href="files.html" title="Files">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="networking/bsd_sockets.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="files.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.timers"></a><a class="link" href="timers.html" title="Timers">Timers</a>
+</h3></div></div></div>
+<p>
+        Long running I/O operations will often have a deadline by which they must
+        have completed. These deadlines may be expressed as absolute times, but are
+        often calculated relative to the current time.
+      </p>
+<p>
+        As a simple example, to perform a synchronous wait operation on a timer using
+        a relative time one may write:
+      </p>
+<pre class="programlisting"><span class="identifier">io_context</span> <span class="identifier">i</span><span class="special">;</span>
+<span class="special">...</span>
+<span class="identifier">steady_timer</span> <span class="identifier">t</span><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
+<span class="identifier">t</span><span class="special">.</span><span class="identifier">expires_after</span><span class="special">(</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">5</span><span class="special">));</span>
+<span class="identifier">t</span><span class="special">.</span><span class="identifier">wait</span><span class="special">();</span>
+</pre>
+<p>
+        More commonly, a program will perform an asynchronous wait operation on a
+        timer:
+      </p>
+<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">)</span> <span class="special">{</span> <span class="special">...</span> <span class="special">}</span>
+<span class="special">...</span>
+<span class="identifier">io_context</span> <span class="identifier">i</span><span class="special">;</span>
+<span class="special">...</span>
+<span class="identifier">steady_timer</span> <span class="identifier">t</span><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
+<span class="identifier">t</span><span class="special">.</span><span class="identifier">expires_after</span><span class="special">(</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">milliseconds</span><span class="special">(</span><span class="number">400</span><span class="special">));</span>
+<span class="identifier">t</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">handler</span><span class="special">);</span>
+<span class="special">...</span>
+<span class="identifier">i</span><span class="special">.</span><span class="identifier">run</span><span class="special">();</span>
+</pre>
+<p>
+        The deadline associated with a timer may also be obtained as an absolute
+        time:
+      </p>
+<pre class="programlisting"><span class="identifier">steady_timer</span><span class="special">::</span><span class="identifier">time_point</span> <span class="identifier">time_of_expiry</span> <span class="special">=</span> <span class="identifier">t</span><span class="special">.</span><span class="identifier">expiry</span><span class="special">();</span>
+</pre>
+<p>
+        which allows composition of timers:
+      </p>
+<pre class="programlisting"><span class="identifier">steady_timer</span> <span class="identifier">t2</span><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
+<span class="identifier">t2</span><span class="special">.</span><span class="identifier">expires_at</span><span class="special">(</span><span class="identifier">t</span><span class="special">.</span><span class="identifier">expiry</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">chrono</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">30</span><span class="special">));</span>
+</pre>
+<h5>
+<a name="asio.overview.timers.h0"></a>
+        <span><a name="asio.overview.timers.see_also"></a></span><a class="link" href="timers.html#asio.overview.timers.see_also">See
+        Also</a>
+      </h5>
+<p>
+        <a class="link" href="../reference/basic_waitable_timer.html" title="basic_waitable_timer">basic_waitable_timer</a>,
+        <a class="link" href="../reference/steady_timer.html" title="steady_timer">steady_timer</a>, <a class="link" href="../reference/system_timer.html" title="system_timer">system_timer</a>,
+        <a class="link" href="../reference/high_resolution_timer.html" title="high_resolution_timer">high_resolution_timer</a>,
+        <a class="link" href="../tutorial/tuttimer1.html" title="Timer.1 - Using a timer synchronously">timer tutorials</a>.
+      </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="networking/bsd_sockets.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="files.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/windows.html

@@ -0,0 +1,44 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Windows-Specific Functionality</title>
+<link rel="stylesheet" href="../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../index.html" title="Asio">
+<link rel="up" href="../overview.html" title="Overview">
+<link rel="prev" href="posix/fork.html" title="Fork">
+<link rel="next" href="windows/stream_handle.html" title="Stream-Oriented HANDLEs">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="posix/fork.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="windows/stream_handle.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.overview.windows"></a><a class="link" href="windows.html" title="Windows-Specific Functionality">Windows-Specific Functionality</a>
+</h3></div></div></div>
+<p>
+        <a class="link" href="windows/stream_handle.html" title="Stream-Oriented HANDLEs">Stream-Oriented HANDLEs</a>
+      </p>
+<p>
+        <a class="link" href="windows/random_access_handle.html" title="Random-Access HANDLEs">Random-Access
+        HANDLEs</a>
+      </p>
+<p>
+        <a class="link" href="windows/object_handle.html" title="Object HANDLEs">Object HANDLEs</a>
+      </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="posix/fork.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="windows/stream_handle.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/windows/object_handle.html

@@ -0,0 +1,94 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Object HANDLEs</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../windows.html" title="Windows-Specific Functionality">
+<link rel="prev" href="random_access_handle.html" title="Random-Access HANDLEs">
+<link rel="next" href="../ssl.html" title="SSL">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="random_access_handle.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../windows.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../ssl.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.windows.object_handle"></a><a class="link" href="object_handle.html" title="Object HANDLEs">Object HANDLEs</a>
+</h4></div></div></div>
+<p>
+          Asio provides Windows-specific classes that permit asynchronous wait operations
+          to be performed on HANDLEs to kernel objects of the following types:
+        </p>
+<div class="itemizedlist"><ul class="itemizedlist" type="disc">
+<li class="listitem">
+              Change notification
+            </li>
+<li class="listitem">
+              Console input
+            </li>
+<li class="listitem">
+              Event
+            </li>
+<li class="listitem">
+              Memory resource notification
+            </li>
+<li class="listitem">
+              Process
+            </li>
+<li class="listitem">
+              Semaphore
+            </li>
+<li class="listitem">
+              Thread
+            </li>
+<li class="listitem">
+              Waitable timer
+            </li>
+</ul></div>
+<p>
+          For example, to perform asynchronous operations on an event, the following
+          object may be created:
+        </p>
+<pre class="programlisting"><span class="identifier">HANDLE</span> <span class="identifier">handle</span> <span class="special">=</span> <span class="special">::</span><span class="identifier">CreateEvent</span><span class="special">(...);</span>
+<span class="identifier">windows</span><span class="special">::</span><span class="identifier">object_handle</span> <span class="identifier">file</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">,</span> <span class="identifier">handle</span><span class="special">);</span>
+</pre>
+<p>
+          The <code class="computeroutput"><span class="identifier">wait</span><span class="special">()</span></code>
+          and <code class="computeroutput"><span class="identifier">async_wait</span><span class="special">()</span></code>
+          member functions may then be used to wait until the kernel object is signalled.
+        </p>
+<h6>
+<a name="asio.overview.windows.object_handle.h0"></a>
+          <span><a name="asio.overview.windows.object_handle.see_also"></a></span><a class="link" href="object_handle.html#asio.overview.windows.object_handle.see_also">See
+          Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/windows__object_handle.html" title="windows::object_handle">windows::object_handle</a>.
+        </p>
+<h6>
+<a name="asio.overview.windows.object_handle.h1"></a>
+          <span><a name="asio.overview.windows.object_handle.notes"></a></span><a class="link" href="object_handle.html#asio.overview.windows.object_handle.notes">Notes</a>
+        </h6>
+<p>
+          Windows object <code class="computeroutput"><span class="identifier">HANDLE</span></code>s
+          are only available at compile time when targeting Windows. Programs may
+          test for the macro <code class="computeroutput"><span class="identifier">ASIO_HAS_WINDOWS_OBJECT_HANDLE</span></code>
+          to determine whether they are supported.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="random_access_handle.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../windows.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="../ssl.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>

3party/asio/doc/asio/overview/windows/random_access_handle.html

@@ -0,0 +1,76 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Random-Access HANDLEs</title>
+<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
+<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
+<link rel="home" href="../../../index.html" title="Asio">
+<link rel="up" href="../windows.html" title="Windows-Specific Functionality">
+<link rel="prev" href="stream_handle.html" title="Stream-Oriented HANDLEs">
+<link rel="next" href="object_handle.html" title="Object HANDLEs">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+</head>
+<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
+<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="stream_handle.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../windows.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="object_handle.html"><img src="../../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h4 class="title">
+<a name="asio.overview.windows.random_access_handle"></a><a class="link" href="random_access_handle.html" title="Random-Access HANDLEs">Random-Access
+        HANDLEs</a>
+</h4></div></div></div>
+<p>
+          Asio provides Windows-specific classes that permit asynchronous read and
+          write operations to be performed on HANDLEs that refer to regular files.
+        </p>
+<p>
+          For example, to perform asynchronous operations on a file the following
+          object may be created:
+        </p>
+<pre class="programlisting"><span class="identifier">HANDLE</span> <span class="identifier">handle</span> <span class="special">=</span> <span class="special">::</span><span class="identifier">CreateFile</span><span class="special">(...);</span>
+<span class="identifier">windows</span><span class="special">::</span><span class="identifier">random_access_handle</span> <span class="identifier">file</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">,</span> <span class="identifier">handle</span><span class="special">);</span>
+</pre>
+<p>
+          Data may be read from or written to the handle using one of the <code class="computeroutput"><span class="identifier">read_some_at</span><span class="special">()</span></code>,
+          <code class="computeroutput"><span class="identifier">async_read_some_at</span><span class="special">()</span></code>,
+          <code class="computeroutput"><span class="identifier">write_some_at</span><span class="special">()</span></code>
+          or <code class="computeroutput"><span class="identifier">async_write_some_at</span><span class="special">()</span></code> member functions. However, like the equivalent
+          functions (<code class="computeroutput"><span class="identifier">read_some</span><span class="special">()</span></code>,
+          etc.) on streams, these functions are only required to transfer one or
+          more bytes in a single operation. Therefore free functions called <a class="link" href="../../reference/read_at.html" title="read_at">read_at()</a>, <a class="link" href="../../reference/async_read_at.html" title="async_read_at">async_read_at()</a>,
+          <a class="link" href="../../reference/write_at.html" title="write_at">write_at()</a> and <a class="link" href="../../reference/async_write_at.html" title="async_write_at">async_write_at()</a>
+          have been created to repeatedly call the corresponding <code class="literal"><span class="bold"><strong>*</strong></span>_some_at()</code> function until all data has
+          been transferred.
+        </p>
+<h6>
+<a name="asio.overview.windows.random_access_handle.h0"></a>
+          <span><a name="asio.overview.windows.random_access_handle.see_also"></a></span><a class="link" href="random_access_handle.html#asio.overview.windows.random_access_handle.see_also">See Also</a>
+        </h6>
+<p>
+          <a class="link" href="../../reference/windows__random_access_handle.html" title="windows::random_access_handle">windows::random_access_handle</a>.
+        </p>
+<h6>
+<a name="asio.overview.windows.random_access_handle.h1"></a>
+          <span><a name="asio.overview.windows.random_access_handle.notes"></a></span><a class="link" href="random_access_handle.html#asio.overview.windows.random_access_handle.notes">Notes</a>
+        </h6>
+<p>
+          Windows random-access <code class="computeroutput"><span class="identifier">HANDLE</span></code>s
+          are only available at compile time when targeting Windows and only when
+          the I/O completion port backend is used (which is the default). A program
+          may test for the macro <code class="computeroutput"><span class="identifier">ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE</span></code>
+          to determine whether they are supported.
+        </p>
+</div>
+<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
+</div>
+<hr>
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