Merge branch 'purpleKarrot-develop' into develop

.travis.yml

@@ -2,39 +2,46 @@ language: cpp
 
 os:
   - linux
+  - osx
 
 compiler:
-  # - clang # disabled clang due to missing libc++
+  - clang
   - gcc
 
+env:
+  - CONFIG=Release
+  - CONFIG=Debug
+
 notifications:
  email:
    on_success: change
    on_failure: always
 
-before_install:
-  # install boost 1.50 (headers only), travis currently offers 1.46 and 1.48
-  - wget http://sourceforge.net/projects/boost/files/boost/1.50.0/boost_1_50_0.tar.bz2/download -O /tmp/boost.tar.bz2
-  - mkdir -p temp
-  - cd temp
-  - tar jxf /tmp/boost.tar.bz2 boost_1_50_0/boost # extract headers only
-  - sudo mkdir -p /usr/local/include/
-  - sudo ln -s $PWD/boost_1_50_0/boost /usr/local/include
-  - cd ..
-  #install g++-4.8
-  - sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
-  - sudo apt-get update
-  - if [ "$CXX" = "g++" ]; then sudo apt-get install g++-4.8; fi
-  - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
-
 install:
-  - "mkdir -p $TRAVIS_BUILD_DIR/build/scripts"
+  - CMAKE_VERSION_MM=3.2
-  - "cd $TRAVIS_BUILD_DIR/build/scripts"
+  - CMAKE_VERSION_FULL=$CMAKE_VERSION_MM.2
-  - "cmake $TRAVIS_BUILD_DIR"
+  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then
+    sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
+      && sudo add-apt-repository -y ppa:apokluda/boost1.53
+      && sudo apt-get update -qq
+      && sudo apt-get install -qq g++-4.8 libboost1.53-dev --no-install-recommends
+      && sudo update-alternatives --quiet --install /usr/bin/gcc gcc /usr/bin/gcc-4.6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.6 --slave /usr/bin/gcov gcov /usr/bin/gcov-4.6
+      && sudo update-alternatives --quiet --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 40 --slave /usr/bin/g++ g++ /usr/bin/g++-4.8 --slave /usr/bin/gcov gcov /usr/bin/gcov-4.8
+      && sudo update-alternatives --quiet --set gcc /usr/bin/gcc-4.8
+      && wget http://www.cmake.org/files/v${CMAKE_VERSION_MM}/cmake-${CMAKE_VERSION_FULL}-Linux-x86_64.sh
+      && sudo sh cmake-${CMAKE_VERSION_FULL}-Linux-x86_64.sh --prefix=/usr/local --exclude-subdir;
+    fi
+  - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew install boost cmake; fi
+
+before_script:
+   - mkdir build
+   - cd build
+   - if [[ "$CXX" = "g++" && "$CONFIG" = "Debug" ]]; then export CXXFLAGS="--coverage"; fi
+   - cmake .. -DCMAKE_BUILD_TYPE=$CONFIG
 
 script:
-  - "cd $TRAVIS_BUILD_DIR/build/scripts"
+   - cmake --build . --config $CONFIG
-  - "make -j3"
+   - ctest --output-on-failure
-  # test compile-time constraints
-  - "make test_sqlpp_constraints"
 
+after_script:
+  - ../coveralls

CMakeLists.txt

@@ -22,25 +22,21 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 3.2 FATAL_ERROR)
+project(sqlpp11 VERSION 0.1 LANGUAGES CXX)
 
-# Cygwin does not define WIN32 and warn if not use with this flag
-set(CMAKE_LEGACY_CYGWIN_WIN32 0) # Remove when CMake >= 2.8.4 is required
-
-project (sqlpp11)
 enable_testing()
 
-message(STATUS "Using ${CMAKE_CXX_COMPILER} (compiler id: ${CMAKE_CXX_COMPILER_ID})")
+add_library(sqlpp11 INTERFACE)
-if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+
-	set(CMAKE_CXX_FLAGS "-std=c++11 -stdlib=libc++ -Wall ${CMAKE_CXX_FLAGS}")
+target_include_directories(sqlpp11 INTERFACE
-elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+  $<BUILD_INTERFACE:${sqlpp11_SOURCE_DIR}/include>
-	set(CMAKE_CXX_FLAGS "-std=c++11 -Wall ${CMAKE_CXX_FLAGS}")
+  )
-endif ()
+
-set(CMAKE_CXX_FLAGS "-Wconversion -Wpedantic -Wshadow ${CMAKE_CXX_FLAGS}")
+target_compile_features(sqlpp11 INTERFACE
+  cxx_variadic_templates
+  )
 
-set(include_dir "${PROJECT_SOURCE_DIR}/include")
-file(GLOB_RECURSE sqlpp_headers "${include_dir}/*.h")
-include_directories("${include_dir}")
 add_subdirectory(tests)
 add_subdirectory(test_constraints)
 add_subdirectory(examples)

CREDITS

@@ -6,6 +6,7 @@ This library evolved through several stages and would probably not exist without
   * Paul Körbitz:   Feedback and extensions
   * Peter Knoblach: Initial ideas
   * Ulrich Küttler: Feedback and extensions
+  * Daniel Pfeifer: Buildsystem, Travis, Coveralls
 
 
   * Metafeed GmbH: Production code using a forerunner version

README.md

@@ -1,6 +1,9 @@
 sqlpp11
 =======
 
+[![Build Status](https://travis-ci.org/purpleKarrot/sqlpp11.svg?branch=develop)](https://travis-ci.org/purpleKarrot/sqlpp11)
+[![Coverage Status](https://coveralls.io/repos/purpleKarrot/sqlpp11/badge.svg?branch=develop)](https://coveralls.io/r/purpleKarrot/sqlpp11?branch=develop)
+
 A type safe embedded domain specific language for SQL queries and results in C++
 
 Extensive documentation is found in the wiki, https://github.com/rbock/sqlpp11/wiki

coveralls

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+if [ 0 -eq $(find -iname *.gcda | wc -l) ]
+then
+  exit 0
+fi
+
+gcov --source-prefix ${TRAVIS_BUILD_DIR} --preserve-paths --relative-only $(find -iname *.gcda) 1>/dev/null || exit 0
+
+cat >coverage.json <<EOF
+{
+  "service_job_id": "${TRAVIS_JOB_ID}",
+  "service_name": "travis-ci",
+  "source_files": [
+EOF
+
+for file in include*.gcov
+do
+  path=$(echo ${file} | sed -re 's%#%\/%g; s%.gcov$%%')
+  cat >>coverage.json <<EOF
+    {
+      "name": "${path}",
+      "source_digest": "$(md5sum ${TRAVIS_BUILD_DIR}/${path} | awk '{ print $1 }')",
+      "coverage": [$(tail -n +3 ${file} | cut -d ':' -f 1 | sed -re 's%^ +%%g; s%-%null%g; s%^[#=]+$%0%;' | tr $'\n' ',' | sed -re 's%,$%%')]
+    },
+EOF
+done
+
+mv coverage.json coverage.json.tmp
+cat >coverage.json <(head -n -1 coverage.json.tmp) <(echo -e "    }\n  ]\n}")
+curl -F json_file=@coverage.json https://coveralls.io/api/v1/jobs

examples/CMakeLists.txt

@@ -1,23 +1,50 @@
+# Copyright (c) 2013-2015, Roland Bock
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+#
+#   Redistributions of source code must retain the above copyright notice, this
+#   list of conditions and the following disclaimer.
+#
+#   Redistributions in binary form must reproduce the above copyright notice, this
+#   list of conditions and the following disclaimer in the documentation and/or
+#   other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-macro (build arg)
+set(example_names
-	# Add headers to sources to enable file browsing in IDEs
+  #sample
-	include_directories("${CMAKE_CURRENT_SOURCE_DIR}/../tests")
+  insert
-	add_executable("Sqlpp11Example${arg}" "${arg}.cpp" ${sqlpp_headers} "${CMAKE_CURRENT_SOURCE_DIR}/../tests/MockDb.h" "${CMAKE_CURRENT_LIST_DIR}/Sample.h")
+  update
-	add_test("${arg}" "Sqlpp11Example${arg}")
+  remove
-endmacro ()
+  select
+  )
 
-#build(sample)
-build(insert)
-build(update)
-build(remove)
-build(select)
 find_package(Boost 1.50)
 if(Boost_FOUND)
-  MESSAGE(${Boost_INCLUDE_DIRS})
   include_directories(${Boost_INCLUDE_DIRS})
-  build(ppgen)
+  list(APPEND example_names ppgen)
 endif()
 
+create_test_sourcelist(example_sources example_main.cpp ${example_names})
+add_executable(sqlpp11_examples ${example_sources})
+target_link_libraries(sqlpp11_examples PRIVATE sqlpp11 sqlpp11_testing)
+
+foreach(example IN LISTS example_names)
+  add_test(NAME sqlpp11.examples.${example}
+    COMMAND sqlpp11_examples ${example}
+    )
+endforeach()
 
 #find_package(PythonInterp REQUIRED)
 

examples/insert.cpp

@@ -27,7 +27,7 @@
 #include "MockDb.h"
 #include <sqlpp11/sqlpp11.h>
 
-int main()
+int insert(int, char**)
 {
 	MockDb db;
 
@@ -64,4 +64,5 @@ int main()
 	pi.params.feature = true;
 
 	db(pi);
+	return 0;
 }

examples/ppgen.cpp

@@ -61,7 +61,7 @@ SQLPP_DECLARE_TABLE(
 	(fatal, bool        , SQLPP_NOT_NULL   )
 )
 
-int main()
+int ppgen(int, char**)
 {
 	MockDb db;
 	tab_person::tab_person   p;
@@ -97,4 +97,5 @@ int main()
 	pi.params.feature = true;
 
 	db(pi);
+	return 0;
 }

examples/remove.cpp

@@ -27,7 +27,7 @@
 #include "MockDb.h"
 #include <sqlpp11/sqlpp11.h>
 
-int main()
+int remove(int, char**)
 {
 	MockDb db;
 
@@ -37,4 +37,5 @@ int main()
 	db(remove_from(p)
 			.using_(p, q)
 			.where(p.feature == q.id and q.fatal == true));
+	return 0;
 }

examples/select.cpp

@@ -36,7 +36,7 @@
 
 SQLPP_ALIAS_PROVIDER(cheesecake)
 
-int main()
+int select(int, char**)
 {
 	static constexpr bool some_condition = true;
 	static constexpr bool some_other_condition = false;
@@ -153,4 +153,5 @@ int main()
 
 
 
+	return 0;
 }

examples/update.cpp

@@ -27,7 +27,7 @@
 #include "MockDb.h"
 #include <sqlpp11/sqlpp11.h>
 
-int main()
+int update(int, char**)
 {
 	MockDb db;
 
@@ -35,4 +35,5 @@ int main()
 	//test::TabFeature q;
 
 	db(update(p).set(p.feature = 7).where(p.id == 23));
+	return 0;
 }

test_constraints/CMakeLists.txt

@@ -1,31 +1,40 @@
-include_directories("${CMAKE_CURRENT_SOURCE_DIR}/../tests")
+# Copyright (c) 2013-2015, Roland Bock
-
+# All rights reserved.
-add_custom_target(test_sqlpp_constraints COMMAND true)
+#
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+#
+#   Redistributions of source code must retain the above copyright notice, this
+#   list of conditions and the following disclaimer.
+#
+#   Redistributions in binary form must reproduce the above copyright notice, this
+#   list of conditions and the following disclaimer in the documentation and/or
+#   other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 function(test_constraint name pattern)
-
+  set(test sqlpp11.test_constraints.${name})
-	add_executable(
+  set(target sqlpp11_${name})
-		"${name}"
+  add_executable(${target} EXCLUDE_FROM_ALL ${name}.cpp)
-		EXCLUDE_FROM_ALL
+  target_link_libraries(${target} PRIVATE sqlpp11 sqlpp11_testing)
-		"${name}.cpp"
+  add_test(NAME ${test}
+    COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR} --target ${target}
     )
+  set_property(TEST ${test} PROPERTY PASS_REGULAR_EXPRESSION ${pattern})
+endfunction()
 
-	add_custom_command(OUTPUT "${name}.out"
+test_constraint(count_of_count "count\\(\\) cannot be used on an aggregate function")
-				COMMAND "${CMAKE_MAKE_PROGRAM}" "${name}" > "${CMAKE_CURRENT_BINARY_DIR}/${name}.out" 2>&1  || true
+test_constraint(max_of_max "max\\(\\) cannot be used on an aggregate function")
-				COMMAND grep "${pattern}" "${CMAKE_CURRENT_BINARY_DIR}/${name}.out" > /dev/null
-				DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/${name}.cpp"
-				COMMENT "${name}"
-				VERBATIM)
-
-	add_custom_target("test_${name}" DEPENDS "${name}.out" COMMAND true)
-
-
-	add_dependencies(test_sqlpp_constraints "test_${name}")
-
-endfunction(test_constraint)
-
-test_constraint(count_of_count "count() cannot be used on an aggregate function")
-test_constraint(max_of_max "max() cannot be used on an aggregate function")
 test_constraint(no_conversion_operator_if_null_not_trivial "int i = row.alpha")
 test_constraint(require_insert "required column is missing")
 test_constraint(must_not_insert "one assignment is prohibited")

tests/BooleanExpression.cpp

@@ -29,7 +29,7 @@
 #include <sqlpp11/sqlpp11.h>
 
 
-int main()
+int BooleanExpression(int, char**)
 {
 	MockDb db = {};
 	test::TabBar t; 

tests/CMakeLists.txt

@@ -1,25 +1,57 @@
+# Copyright (c) 2013-2015, Roland Bock
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+#
+#   Redistributions of source code must retain the above copyright notice, this
+#   list of conditions and the following disclaimer.
+#
+#   Redistributions in binary form must reproduce the above copyright notice, this
+#   list of conditions and the following disclaimer in the documentation and/or
+#   other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-macro (build_and_run arg)
+add_library(sqlpp11_testing INTERFACE)
-	# Add headers to sources to enable file browsing in IDEs
+target_include_directories(sqlpp11_testing INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
-	include_directories("${CMAKE_BINARY_DIR}/tests")
+target_compile_options(sqlpp11_testing INTERFACE -Wall -Wextra -pedantic)
-	add_executable("${arg}" "${arg}.cpp" ${sqlpp_headers} "${CMAKE_CURRENT_LIST_DIR}/Sample.h")
-	add_test("${arg}" "${CMAKE_BINARY_DIR}/tests/${arg}")
-endmacro ()
 
-build_and_run(BooleanExpressionTest)
+set(test_names
-build_and_run(CustomQueryTest)
+  BooleanExpression
-build_and_run(InterpretTest)
+  CustomQuery
-build_and_run(InsertTest)
+  Interpret
-build_and_run(RemoveTest)
+  Insert
-build_and_run(UpdateTest)
+  Remove
-build_and_run(SelectTest)
+  Update
-build_and_run(SelectTypeTest)
+  Select
-build_and_run(FunctionTest)
+  SelectType
-build_and_run(PreparedTest)
+  Function
-build_and_run(Minimalistic)
+  Prepared
-build_and_run(ResultTest)
+  Minimalistic
-build_and_run(UnionTest)
+  Result
-build_and_run(WithTest)
+  Union
+  With
+  )
+
+create_test_sourcelist(test_sources test_main.cpp ${test_names})
+add_executable(sqlpp11_tests ${test_sources})
+target_link_libraries(sqlpp11_tests PRIVATE sqlpp11 sqlpp11_testing)
+
+foreach(test IN LISTS test_names)
+  add_test(NAME sqlpp11.tests.${test}
+    COMMAND sqlpp11_tests ${test}
+    )
+endforeach()
 
 # if you want to use the generator, you can do something like this:
 #find_package(PythonInterp REQUIRED)

tests/CustomQuery.cpp

@@ -29,7 +29,7 @@
 #include <sqlpp11/sqlpp11.h>
 #include <sqlpp11/custom_query.h>
 
-int main()
+int CustomQuery(int, char**)
 {
 	MockDb db = {};
 	MockDb::_serializer_context_t printer;

tests/Function.cpp

@@ -34,7 +34,7 @@
 
 SQLPP_ALIAS_PROVIDER(kaesekuchen)
 
-int main()
+int Function(int, char**)
 {
 	MockDb db = {};
 	test::TabFoo f; 

tests/Insert.cpp

@@ -31,7 +31,7 @@
 #include <iostream>
 
 
-int main()
+int Insert(int, char**)
 {
 	MockDb db;
 	MockDb::_serializer_context_t printer;

tests/Interpret.cpp

@@ -29,7 +29,7 @@
 
 #include <iostream>
 
-int main()
+int Interpret(int, char**)
 {
 	MockDb db = {};
 	MockDb::_serializer_context_t printer;

tests/Minimalistic.cpp

@@ -1,5 +1,6 @@
 #include <sqlpp11/sqlpp11.h>
 
-int main()
+int Minimalistic(int, char**)
 {
+	return 0;
 }

tests/Prepared.cpp

@@ -29,7 +29,7 @@
 #include <sqlpp11/functions.h>
 #include <sqlpp11/select.h>
 
-int main()
+int Prepared(int, char**)
 {
 	MockDb db = {};
 	//test::TabFoo f; 

tests/Remove.cpp

@@ -30,7 +30,7 @@
 #include "is_regular.h"
 
 
-int main()
+int Remove(int, char**)
 {
 	MockDb db;
 	MockDb::_serializer_context_t printer;

tests/Result.cpp

@@ -32,7 +32,7 @@
 static_assert(not sqlpp::enforce_null_result_treatment_t<MockDb>::value, "MockDb interprets NULL as trivial");
 static_assert(sqlpp::enforce_null_result_treatment_t<EnforceDb>::value, "MockDb does not interpret NULL as trivial");
 
-int main()
+int Result(int, char**)
 {
 	MockDb db = {};
 	EnforceDb edb {};

tests/Select.cpp

@@ -43,7 +43,7 @@ int64_t getColumn(Db&& db, const Column& column)
 		return 0;
 }
 
-int main()
+int Select(int, char**)
 {
 	MockDb db = {};
 	MockDb::_serializer_context_t printer;

tests/SelectType.cpp

@@ -41,7 +41,7 @@ namespace alias
 	SQLPP_ALIAS_PROVIDER(right)
 }
 
-int main()
+int SelectType(int, char**)
 {
 	MockDb db = {};
 	MockDb::_serializer_context_t printer;

tests/Union.cpp

@@ -29,7 +29,7 @@
 #include <sqlpp11/alias_provider.h>
 #include <iostream>
 
-int main()
+int Union(int, char**)
 {
 	MockDb db;
 	MockDb::_serializer_context_t printer;

tests/Update.cpp

@@ -29,7 +29,7 @@
 #include "MockDb.h"
 #include "is_regular.h"
 
-int main()
+int Update(int, char**)
 {
 	MockDb db;
 	MockDb::_serializer_context_t printer;

tests/With.cpp

@@ -29,7 +29,7 @@
 #include <sqlpp11/alias_provider.h>
 #include <iostream>
 
-int main()
+int With(int, char**)
 {
 	MockDb db;
 	MockDb::_serializer_context_t printer;