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fix replace string_view by nonstd::string_view
2024-01-05 11:19:26 +08:00

1685 lines
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// Copyright 2017-2020 by Martin Moene
//
// string-view lite, a C++17-like string_view for C++98 and later.
// For more information see https://github.com/martinmoene/string-view-lite
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#pragma once
#ifndef NONSTD_SV_LITE_H_INCLUDED
#define NONSTD_SV_LITE_H_INCLUDED
#define string_view_lite_MAJOR 1
#define string_view_lite_MINOR 7
#define string_view_lite_PATCH 0
#define string_view_lite_VERSION nssv_STRINGIFY(string_view_lite_MAJOR) "." nssv_STRINGIFY(string_view_lite_MINOR) "." nssv_STRINGIFY(string_view_lite_PATCH)
#define nssv_STRINGIFY( x ) nssv_STRINGIFY_( x )
#define nssv_STRINGIFY_( x ) #x
// string-view lite configuration:
#define nssv_STRING_VIEW_DEFAULT 0
#define nssv_STRING_VIEW_NONSTD 1
#define nssv_STRING_VIEW_STD 2
// tweak header support:
#ifdef __has_include
# if __has_include(<nonstd/string_view.tweak.hpp>)
# include <nonstd/string_view.tweak.hpp>
# endif
#define nssv_HAVE_TWEAK_HEADER 1
#else
#define nssv_HAVE_TWEAK_HEADER 0
//# pragma message("string_view.hpp: Note: Tweak header not supported.")
#endif
// string_view selection and configuration:
#if !defined( nssv_CONFIG_SELECT_STRING_VIEW )
# define nssv_CONFIG_SELECT_STRING_VIEW ( nssv_HAVE_STD_STRING_VIEW ? nssv_STRING_VIEW_STD : nssv_STRING_VIEW_NONSTD )
#endif
#ifndef nssv_CONFIG_STD_SV_OPERATOR
# define nssv_CONFIG_STD_SV_OPERATOR 0
#endif
#ifndef nssv_CONFIG_USR_SV_OPERATOR
# define nssv_CONFIG_USR_SV_OPERATOR 1
#endif
#ifdef nssv_CONFIG_CONVERSION_STD_STRING
# define nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS nssv_CONFIG_CONVERSION_STD_STRING
# define nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS nssv_CONFIG_CONVERSION_STD_STRING
#endif
#ifndef nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS
# define nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS 1
#endif
#ifndef nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
# define nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS 1
#endif
#ifndef nssv_CONFIG_NO_STREAM_INSERTION
# define nssv_CONFIG_NO_STREAM_INSERTION 0
#endif
// Control presence of exception handling (try and auto discover):
#ifndef nssv_CONFIG_NO_EXCEPTIONS
# if defined(_MSC_VER)
# include <cstddef> // for _HAS_EXCEPTIONS
# endif
# if defined(__cpp_exceptions) || defined(__EXCEPTIONS) || (_HAS_EXCEPTIONS)
# define nssv_CONFIG_NO_EXCEPTIONS 0
# else
# define nssv_CONFIG_NO_EXCEPTIONS 1
# endif
#endif
// C++ language version detection (C++23 is speculative):
// Note: VC14.0/1900 (VS2015) lacks too much from C++14.
#ifndef nssv_CPLUSPLUS
# if defined(_MSVC_LANG ) && !defined(__clang__)
# define nssv_CPLUSPLUS (_MSC_VER == 1900 ? 201103L : _MSVC_LANG )
# else
# define nssv_CPLUSPLUS __cplusplus
# endif
#endif
#define nssv_CPP98_OR_GREATER ( nssv_CPLUSPLUS >= 199711L )
#define nssv_CPP11_OR_GREATER ( nssv_CPLUSPLUS >= 201103L )
#define nssv_CPP11_OR_GREATER_ ( nssv_CPLUSPLUS >= 201103L )
#define nssv_CPP14_OR_GREATER ( nssv_CPLUSPLUS >= 201402L )
#define nssv_CPP17_OR_GREATER ( nssv_CPLUSPLUS >= 201703L )
#define nssv_CPP20_OR_GREATER ( nssv_CPLUSPLUS >= 202002L )
#define nssv_CPP23_OR_GREATER ( nssv_CPLUSPLUS >= 202300L )
// use C++17 std::string_view if available and requested:
#if nssv_CPP17_OR_GREATER && defined(__has_include )
# if __has_include( <string_view> )
# define nssv_HAVE_STD_STRING_VIEW 1
# else
# define nssv_HAVE_STD_STRING_VIEW 0
# endif
#else
# define nssv_HAVE_STD_STRING_VIEW 0
#endif
#define nssv_USES_STD_STRING_VIEW ( (nssv_CONFIG_SELECT_STRING_VIEW == nssv_STRING_VIEW_STD) || ((nssv_CONFIG_SELECT_STRING_VIEW == nssv_STRING_VIEW_DEFAULT) && nssv_HAVE_STD_STRING_VIEW) )
#define nssv_HAVE_STARTS_WITH ( nssv_CPP20_OR_GREATER || !nssv_USES_STD_STRING_VIEW )
#define nssv_HAVE_ENDS_WITH nssv_HAVE_STARTS_WITH
//
// Use C++17 std::string_view:
//
#if nssv_USES_STD_STRING_VIEW
#include <string_view>
// Extensions for std::string:
#if nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
namespace nonstd {
template< class CharT, class Traits, class Allocator = std::allocator<CharT> >
std::basic_string<CharT, Traits, Allocator>
to_string( std::basic_string_view<CharT, Traits> v, Allocator const & a = Allocator() )
{
return std::basic_string<CharT,Traits, Allocator>( v.begin(), v.end(), a );
}
template< class CharT, class Traits, class Allocator >
std::basic_string_view<CharT, Traits>
to_string_view( std::basic_string<CharT, Traits, Allocator> const & s )
{
return std::basic_string_view<CharT, Traits>( s.data(), s.size() );
}
// Literal operators sv and _sv:
#if nssv_CONFIG_STD_SV_OPERATOR
using namespace std::literals::string_view_literals;
#endif
#if nssv_CONFIG_USR_SV_OPERATOR
inline namespace literals {
inline namespace string_view_literals {
constexpr std::string_view operator "" _sv( const char* str, size_t len ) noexcept // (1)
{
return std::string_view{ str, len };
}
constexpr std::u16string_view operator "" _sv( const char16_t* str, size_t len ) noexcept // (2)
{
return std::u16string_view{ str, len };
}
constexpr std::u32string_view operator "" _sv( const char32_t* str, size_t len ) noexcept // (3)
{
return std::u32string_view{ str, len };
}
constexpr std::wstring_view operator "" _sv( const wchar_t* str, size_t len ) noexcept // (4)
{
return std::wstring_view{ str, len };
}
}} // namespace literals::string_view_literals
#endif // nssv_CONFIG_USR_SV_OPERATOR
} // namespace nonstd
#endif // nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
namespace nonstd {
using std::string_view;
using std::wstring_view;
using std::u16string_view;
using std::u32string_view;
using std::basic_string_view;
// literal "sv" and "_sv", see above
using std::operator==;
using std::operator!=;
using std::operator<;
using std::operator<=;
using std::operator>;
using std::operator>=;
using std::operator<<;
} // namespace nonstd
#else // nssv_HAVE_STD_STRING_VIEW
//
// Before C++17: use string_view lite:
//
// Compiler versions:
//
// MSVC++ 6.0 _MSC_VER == 1200 nssv_COMPILER_MSVC_VERSION == 60 (Visual Studio 6.0)
// MSVC++ 7.0 _MSC_VER == 1300 nssv_COMPILER_MSVC_VERSION == 70 (Visual Studio .NET 2002)
// MSVC++ 7.1 _MSC_VER == 1310 nssv_COMPILER_MSVC_VERSION == 71 (Visual Studio .NET 2003)
// MSVC++ 8.0 _MSC_VER == 1400 nssv_COMPILER_MSVC_VERSION == 80 (Visual Studio 2005)
// MSVC++ 9.0 _MSC_VER == 1500 nssv_COMPILER_MSVC_VERSION == 90 (Visual Studio 2008)
// MSVC++ 10.0 _MSC_VER == 1600 nssv_COMPILER_MSVC_VERSION == 100 (Visual Studio 2010)
// MSVC++ 11.0 _MSC_VER == 1700 nssv_COMPILER_MSVC_VERSION == 110 (Visual Studio 2012)
// MSVC++ 12.0 _MSC_VER == 1800 nssv_COMPILER_MSVC_VERSION == 120 (Visual Studio 2013)
// MSVC++ 14.0 _MSC_VER == 1900 nssv_COMPILER_MSVC_VERSION == 140 (Visual Studio 2015)
// MSVC++ 14.1 _MSC_VER >= 1910 nssv_COMPILER_MSVC_VERSION == 141 (Visual Studio 2017)
// MSVC++ 14.2 _MSC_VER >= 1920 nssv_COMPILER_MSVC_VERSION == 142 (Visual Studio 2019)
#if defined(_MSC_VER ) && !defined(__clang__)
# define nssv_COMPILER_MSVC_VER (_MSC_VER )
# define nssv_COMPILER_MSVC_VERSION (_MSC_VER / 10 - 10 * ( 5 + (_MSC_VER < 1900 ) ) )
#else
# define nssv_COMPILER_MSVC_VER 0
# define nssv_COMPILER_MSVC_VERSION 0
#endif
#define nssv_COMPILER_VERSION( major, minor, patch ) ( 10 * ( 10 * (major) + (minor) ) + (patch) )
#if defined( __apple_build_version__ )
# define nssv_COMPILER_APPLECLANG_VERSION nssv_COMPILER_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__)
# define nssv_COMPILER_CLANG_VERSION 0
#elif defined( __clang__ )
# define nssv_COMPILER_APPLECLANG_VERSION 0
# define nssv_COMPILER_CLANG_VERSION nssv_COMPILER_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__)
#else
# define nssv_COMPILER_APPLECLANG_VERSION 0
# define nssv_COMPILER_CLANG_VERSION 0
#endif
#if defined(__GNUC__) && !defined(__clang__)
# define nssv_COMPILER_GNUC_VERSION nssv_COMPILER_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
#else
# define nssv_COMPILER_GNUC_VERSION 0
#endif
// half-open range [lo..hi):
#define nssv_BETWEEN( v, lo, hi ) ( (lo) <= (v) && (v) < (hi) )
// Presence of language and library features:
#ifdef _HAS_CPP0X
# define nssv_HAS_CPP0X _HAS_CPP0X
#else
# define nssv_HAS_CPP0X 0
#endif
// Unless defined otherwise below, consider VC14 as C++11 for variant-lite:
#if nssv_COMPILER_MSVC_VER >= 1900
# undef nssv_CPP11_OR_GREATER
# define nssv_CPP11_OR_GREATER 1
#endif
#define nssv_CPP11_90 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1500)
#define nssv_CPP11_100 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1600)
#define nssv_CPP11_110 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1700)
#define nssv_CPP11_120 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1800)
#define nssv_CPP11_140 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1900)
#define nssv_CPP11_141 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1910)
#define nssv_CPP14_000 (nssv_CPP14_OR_GREATER)
#define nssv_CPP17_000 (nssv_CPP17_OR_GREATER)
// Presence of C++11 language features:
#define nssv_HAVE_CONSTEXPR_11 nssv_CPP11_140
#define nssv_HAVE_EXPLICIT_CONVERSION nssv_CPP11_140
#define nssv_HAVE_INLINE_NAMESPACE nssv_CPP11_140
#define nssv_HAVE_IS_DEFAULT nssv_CPP11_140
#define nssv_HAVE_IS_DELETE nssv_CPP11_140
#define nssv_HAVE_NOEXCEPT nssv_CPP11_140
#define nssv_HAVE_NULLPTR nssv_CPP11_100
#define nssv_HAVE_REF_QUALIFIER nssv_CPP11_140
#define nssv_HAVE_UNICODE_LITERALS nssv_CPP11_140
#define nssv_HAVE_USER_DEFINED_LITERALS nssv_CPP11_140
#define nssv_HAVE_WCHAR16_T nssv_CPP11_100
#define nssv_HAVE_WCHAR32_T nssv_CPP11_100
#if ! ( ( nssv_CPP11_OR_GREATER && nssv_COMPILER_CLANG_VERSION ) || nssv_BETWEEN( nssv_COMPILER_CLANG_VERSION, 300, 400 ) )
# define nssv_HAVE_STD_DEFINED_LITERALS nssv_CPP11_140
#else
# define nssv_HAVE_STD_DEFINED_LITERALS 0
#endif
// Presence of C++14 language features:
#define nssv_HAVE_CONSTEXPR_14 nssv_CPP14_000
// Presence of C++17 language features:
#define nssv_HAVE_NODISCARD nssv_CPP17_000
// Presence of C++ library features:
#define nssv_HAVE_STD_HASH nssv_CPP11_120
// Presence of compiler intrinsics:
// Providing char-type specializations for compare() and length() that
// use compiler intrinsics can improve compile- and run-time performance.
//
// The challenge is in using the right combinations of builtin availability
// and its constexpr-ness.
//
// | compiler | __builtin_memcmp (constexpr) | memcmp (constexpr) |
// |----------|------------------------------|---------------------|
// | clang | 4.0 (>= 4.0 ) | any (? ) |
// | clang-a | 9.0 (>= 9.0 ) | any (? ) |
// | gcc | any (constexpr) | any (? ) |
// | msvc | >= 14.2 C++17 (>= 14.2 ) | any (? ) |
#define nssv_HAVE_BUILTIN_VER ( (nssv_CPP17_000 && nssv_COMPILER_MSVC_VERSION >= 142) || nssv_COMPILER_GNUC_VERSION > 0 || nssv_COMPILER_CLANG_VERSION >= 400 || nssv_COMPILER_APPLECLANG_VERSION >= 900 )
#define nssv_HAVE_BUILTIN_CE ( nssv_HAVE_BUILTIN_VER )
#define nssv_HAVE_BUILTIN_MEMCMP ( (nssv_HAVE_CONSTEXPR_14 && nssv_HAVE_BUILTIN_CE) || !nssv_HAVE_CONSTEXPR_14 )
#define nssv_HAVE_BUILTIN_STRLEN ( (nssv_HAVE_CONSTEXPR_11 && nssv_HAVE_BUILTIN_CE) || !nssv_HAVE_CONSTEXPR_11 )
#ifdef __has_builtin
# define nssv_HAVE_BUILTIN( x ) __has_builtin( x )
#else
# define nssv_HAVE_BUILTIN( x ) 0
#endif
#if nssv_HAVE_BUILTIN(__builtin_memcmp) || nssv_HAVE_BUILTIN_VER
# define nssv_BUILTIN_MEMCMP __builtin_memcmp
#else
# define nssv_BUILTIN_MEMCMP memcmp
#endif
#if nssv_HAVE_BUILTIN(__builtin_strlen) || nssv_HAVE_BUILTIN_VER
# define nssv_BUILTIN_STRLEN __builtin_strlen
#else
# define nssv_BUILTIN_STRLEN strlen
#endif
// C++ feature usage:
#if nssv_HAVE_CONSTEXPR_11
# define nssv_constexpr constexpr
#else
# define nssv_constexpr /*constexpr*/
#endif
#if nssv_HAVE_CONSTEXPR_14
# define nssv_constexpr14 constexpr
#else
# define nssv_constexpr14 /*constexpr*/
#endif
#if nssv_HAVE_EXPLICIT_CONVERSION
# define nssv_explicit explicit
#else
# define nssv_explicit /*explicit*/
#endif
#if nssv_HAVE_INLINE_NAMESPACE
# define nssv_inline_ns inline
#else
# define nssv_inline_ns /*inline*/
#endif
#if nssv_HAVE_NOEXCEPT
# define nssv_noexcept noexcept
#else
# define nssv_noexcept /*noexcept*/
#endif
//#if nssv_HAVE_REF_QUALIFIER
//# define nssv_ref_qual &
//# define nssv_refref_qual &&
//#else
//# define nssv_ref_qual /*&*/
//# define nssv_refref_qual /*&&*/
//#endif
#if nssv_HAVE_NULLPTR
# define nssv_nullptr nullptr
#else
# define nssv_nullptr NULL
#endif
#if nssv_HAVE_NODISCARD
# define nssv_nodiscard [[nodiscard]]
#else
# define nssv_nodiscard /*[[nodiscard]]*/
#endif
// Additional includes:
#include <algorithm>
#include <cassert>
#include <iterator>
#include <limits>
#include <string> // std::char_traits<>
#if ! nssv_CONFIG_NO_STREAM_INSERTION
# include <ostream>
#endif
#if ! nssv_CONFIG_NO_EXCEPTIONS
# include <stdexcept>
#endif
#if nssv_CPP11_OR_GREATER
# include <type_traits>
#endif
// Clang, GNUC, MSVC warning suppression macros:
#if defined(__clang__)
# pragma clang diagnostic ignored "-Wreserved-user-defined-literal"
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wuser-defined-literals"
#elif defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wliteral-suffix"
#endif // __clang__
#if nssv_COMPILER_MSVC_VERSION >= 140
# define nssv_SUPPRESS_MSGSL_WARNING(expr) [[gsl::suppress(expr)]]
# define nssv_SUPPRESS_MSVC_WARNING(code, descr) __pragma(warning(suppress: code) )
# define nssv_DISABLE_MSVC_WARNINGS(codes) __pragma(warning(push)) __pragma(warning(disable: codes))
#else
# define nssv_SUPPRESS_MSGSL_WARNING(expr)
# define nssv_SUPPRESS_MSVC_WARNING(code, descr)
# define nssv_DISABLE_MSVC_WARNINGS(codes)
#endif
#if defined(__clang__)
# define nssv_RESTORE_WARNINGS() _Pragma("clang diagnostic pop")
#elif defined(__GNUC__)
# define nssv_RESTORE_WARNINGS() _Pragma("GCC diagnostic pop")
#elif nssv_COMPILER_MSVC_VERSION >= 140
# define nssv_RESTORE_WARNINGS() __pragma(warning(pop ))
#else
# define nssv_RESTORE_WARNINGS()
#endif
// Suppress the following MSVC (GSL) warnings:
// - C4455, non-gsl : 'operator ""sv': literal suffix identifiers that do not
// start with an underscore are reserved
// - C26472, gsl::t.1 : don't use a static_cast for arithmetic conversions;
// use brace initialization, gsl::narrow_cast or gsl::narow
// - C26481: gsl::b.1 : don't use pointer arithmetic. Use span instead
nssv_DISABLE_MSVC_WARNINGS( 4455 26481 26472 )
//nssv_DISABLE_CLANG_WARNINGS( "-Wuser-defined-literals" )
//nssv_DISABLE_GNUC_WARNINGS( -Wliteral-suffix )
namespace nonstd { namespace sv_lite {
//
// basic_string_view declaration:
//
template
<
class CharT,
class Traits = std::char_traits<CharT>
>
class basic_string_view;
namespace detail {
// support constexpr comparison in C++14;
// for C++17 and later, use provided traits:
template< typename CharT >
inline nssv_constexpr14 int compare( CharT const * s1, CharT const * s2, std::size_t count )
{
while ( count-- != 0 )
{
if ( *s1 < *s2 ) return -1;
if ( *s1 > *s2 ) return +1;
++s1; ++s2;
}
return 0;
}
#if nssv_HAVE_BUILTIN_MEMCMP
// specialization of compare() for char, see also generic compare() above:
inline nssv_constexpr14 int compare( char const * s1, char const * s2, std::size_t count )
{
return nssv_BUILTIN_MEMCMP( s1, s2, count );
}
#endif
#if nssv_HAVE_BUILTIN_STRLEN
// specialization of length() for char, see also generic length() further below:
inline nssv_constexpr std::size_t length( char const * s )
{
return nssv_BUILTIN_STRLEN( s );
}
#endif
#if defined(__OPTIMIZE__)
// gcc, clang provide __OPTIMIZE__
// Expect tail call optimization to make length() non-recursive:
template< typename CharT >
inline nssv_constexpr std::size_t length( CharT * s, std::size_t result = 0 )
{
return *s == '\0' ? result : length( s + 1, result + 1 );
}
#else // OPTIMIZE
// non-recursive:
template< typename CharT >
inline nssv_constexpr14 std::size_t length( CharT * s )
{
std::size_t result = 0;
while ( *s++ != '\0' )
{
++result;
}
return result;
}
#endif // OPTIMIZE
#if nssv_CPP11_OR_GREATER && ! nssv_CPP17_OR_GREATER
#if defined(__OPTIMIZE__)
// gcc, clang provide __OPTIMIZE__
// Expect tail call optimization to make search() non-recursive:
template< class CharT, class Traits = std::char_traits<CharT> >
constexpr const CharT* search( basic_string_view<CharT, Traits> haystack, basic_string_view<CharT, Traits> needle )
{
return haystack.starts_with( needle ) ? haystack.begin() :
haystack.empty() ? haystack.end() : search( haystack.substr(1), needle );
}
#else // OPTIMIZE
// non-recursive:
template< class CharT, class Traits = std::char_traits<CharT> >
constexpr const CharT* search( basic_string_view<CharT, Traits> haystack, basic_string_view<CharT, Traits> needle )
{
return std::search( haystack.begin(), haystack.end(), needle.begin(), needle.end() );
}
#endif // OPTIMIZE
#endif // nssv_CPP11_OR_GREATER && ! nssv_CPP17_OR_GREATER
} // namespace detail
//
// basic_string_view:
//
template
<
class CharT,
class Traits /* = std::char_traits<CharT> */
>
class basic_string_view
{
public:
// Member types:
typedef Traits traits_type;
typedef CharT value_type;
typedef CharT * pointer;
typedef CharT const * const_pointer;
typedef CharT & reference;
typedef CharT const & const_reference;
typedef const_pointer iterator;
typedef const_pointer const_iterator;
typedef std::reverse_iterator< const_iterator > reverse_iterator;
typedef std::reverse_iterator< const_iterator > const_reverse_iterator;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
// 24.4.2.1 Construction and assignment:
nssv_constexpr basic_string_view() nssv_noexcept
: data_( nssv_nullptr )
, size_( 0 )
{}
#if nssv_CPP11_OR_GREATER
nssv_constexpr basic_string_view( basic_string_view const & other ) nssv_noexcept = default;
#else
nssv_constexpr basic_string_view( basic_string_view const & other ) nssv_noexcept
: data_( other.data_)
, size_( other.size_)
{}
#endif
nssv_constexpr basic_string_view( CharT const * s, size_type count ) nssv_noexcept // non-standard noexcept
: data_( s )
, size_( count )
{}
nssv_constexpr basic_string_view( CharT const * s) nssv_noexcept // non-standard noexcept
: data_( s )
#if nssv_CPP17_OR_GREATER
, size_( Traits::length(s) )
#elif nssv_CPP11_OR_GREATER
, size_( detail::length(s) )
#else
, size_( Traits::length(s) )
#endif
{}
#if nssv_HAVE_NULLPTR
# if nssv_HAVE_IS_DELETE
nssv_constexpr basic_string_view( std::nullptr_t ) nssv_noexcept = delete;
# else
private: nssv_constexpr basic_string_view( std::nullptr_t ) nssv_noexcept; public:
# endif
#endif
// Assignment:
#if nssv_CPP11_OR_GREATER
nssv_constexpr14 basic_string_view & operator=( basic_string_view const & other ) nssv_noexcept = default;
#else
nssv_constexpr14 basic_string_view & operator=( basic_string_view const & other ) nssv_noexcept
{
data_ = other.data_;
size_ = other.size_;
return *this;
}
#endif
// 24.4.2.2 Iterator support:
nssv_constexpr const_iterator begin() const nssv_noexcept { return data_; }
nssv_constexpr const_iterator end() const nssv_noexcept { return data_ + size_; }
nssv_constexpr const_iterator cbegin() const nssv_noexcept { return begin(); }
nssv_constexpr const_iterator cend() const nssv_noexcept { return end(); }
nssv_constexpr const_reverse_iterator rbegin() const nssv_noexcept { return const_reverse_iterator( end() ); }
nssv_constexpr const_reverse_iterator rend() const nssv_noexcept { return const_reverse_iterator( begin() ); }
nssv_constexpr const_reverse_iterator crbegin() const nssv_noexcept { return rbegin(); }
nssv_constexpr const_reverse_iterator crend() const nssv_noexcept { return rend(); }
// 24.4.2.3 Capacity:
nssv_constexpr size_type size() const nssv_noexcept { return size_; }
nssv_constexpr size_type length() const nssv_noexcept { return size_; }
nssv_constexpr size_type max_size() const nssv_noexcept { return (std::numeric_limits< size_type >::max)(); }
// since C++20
nssv_nodiscard nssv_constexpr bool empty() const nssv_noexcept
{
return 0 == size_;
}
// 24.4.2.4 Element access:
nssv_constexpr const_reference operator[]( size_type pos ) const
{
return data_at( pos );
}
nssv_constexpr14 const_reference at( size_type pos ) const
{
#if nssv_CONFIG_NO_EXCEPTIONS
assert( pos < size() );
#else
if ( pos >= size() )
{
throw std::out_of_range("nonstd::string_view::at()");
}
#endif
return data_at( pos );
}
nssv_constexpr const_reference front() const { return data_at( 0 ); }
nssv_constexpr const_reference back() const { return data_at( size() - 1 ); }
nssv_constexpr const_pointer data() const nssv_noexcept { return data_; }
// 24.4.2.5 Modifiers:
nssv_constexpr14 void remove_prefix( size_type n )
{
assert( n <= size() );
data_ += n;
size_ -= n;
}
nssv_constexpr14 void remove_suffix( size_type n )
{
assert( n <= size() );
size_ -= n;
}
nssv_constexpr14 void swap( basic_string_view & other ) nssv_noexcept
{
const basic_string_view tmp(other);
other = *this;
*this = tmp;
}
// 24.4.2.6 String operations:
size_type copy( CharT * dest, size_type n, size_type pos = 0 ) const
{
#if nssv_CONFIG_NO_EXCEPTIONS
assert( pos <= size() );
#else
if ( pos > size() )
{
throw std::out_of_range("nonstd::string_view::copy()");
}
#endif
const size_type rlen = (std::min)( n, size() - pos );
(void) Traits::copy( dest, data() + pos, rlen );
return rlen;
}
nssv_constexpr14 basic_string_view substr( size_type pos = 0, size_type n = npos ) const
{
#if nssv_CONFIG_NO_EXCEPTIONS
assert( pos <= size() );
#else
if ( pos > size() )
{
throw std::out_of_range("nonstd::string_view::substr()");
}
#endif
return basic_string_view( data() + pos, (std::min)( n, size() - pos ) );
}
// compare(), 6x:
nssv_constexpr14 int compare( basic_string_view other ) const nssv_noexcept // (1)
{
#if nssv_CPP17_OR_GREATER
if ( const int result = Traits::compare( data(), other.data(), (std::min)( size(), other.size() ) ) )
#else
if ( const int result = detail::compare( data(), other.data(), (std::min)( size(), other.size() ) ) )
#endif
{
return result;
}
return size() == other.size() ? 0 : size() < other.size() ? -1 : 1;
}
nssv_constexpr int compare( size_type pos1, size_type n1, basic_string_view other ) const // (2)
{
return substr( pos1, n1 ).compare( other );
}
nssv_constexpr int compare( size_type pos1, size_type n1, basic_string_view other, size_type pos2, size_type n2 ) const // (3)
{
return substr( pos1, n1 ).compare( other.substr( pos2, n2 ) );
}
nssv_constexpr int compare( CharT const * s ) const // (4)
{
return compare( basic_string_view( s ) );
}
nssv_constexpr int compare( size_type pos1, size_type n1, CharT const * s ) const // (5)
{
return substr( pos1, n1 ).compare( basic_string_view( s ) );
}
nssv_constexpr int compare( size_type pos1, size_type n1, CharT const * s, size_type n2 ) const // (6)
{
return substr( pos1, n1 ).compare( basic_string_view( s, n2 ) );
}
// 24.4.2.7 Searching:
// starts_with(), 3x, since C++20:
nssv_constexpr bool starts_with( basic_string_view v ) const nssv_noexcept // (1)
{
return size() >= v.size() && compare( 0, v.size(), v ) == 0;
}
nssv_constexpr bool starts_with( CharT c ) const nssv_noexcept // (2)
{
return starts_with( basic_string_view( &c, 1 ) );
}
nssv_constexpr bool starts_with( CharT const * s ) const // (3)
{
return starts_with( basic_string_view( s ) );
}
// ends_with(), 3x, since C++20:
nssv_constexpr bool ends_with( basic_string_view v ) const nssv_noexcept // (1)
{
return size() >= v.size() && compare( size() - v.size(), npos, v ) == 0;
}
nssv_constexpr bool ends_with( CharT c ) const nssv_noexcept // (2)
{
return ends_with( basic_string_view( &c, 1 ) );
}
nssv_constexpr bool ends_with( CharT const * s ) const // (3)
{
return ends_with( basic_string_view( s ) );
}
// find(), 4x:
nssv_constexpr size_type find( basic_string_view v, size_type pos = 0 ) const nssv_noexcept // (1)
{
return assert( v.size() == 0 || v.data() != nssv_nullptr )
, pos >= size()
? npos : to_pos(
#if nssv_CPP11_OR_GREATER && ! nssv_CPP17_OR_GREATER
detail::search( substr(pos), v )
#else
std::search( cbegin() + pos, cend(), v.cbegin(), v.cend(), Traits::eq )
#endif
);
}
nssv_constexpr size_type find( CharT c, size_type pos = 0 ) const nssv_noexcept // (2)
{
return find( basic_string_view( &c, 1 ), pos );
}
nssv_constexpr size_type find( CharT const * s, size_type pos, size_type n ) const // (3)
{
return find( basic_string_view( s, n ), pos );
}
nssv_constexpr size_type find( CharT const * s, size_type pos = 0 ) const // (4)
{
return find( basic_string_view( s ), pos );
}
// rfind(), 4x:
nssv_constexpr14 size_type rfind( basic_string_view v, size_type pos = npos ) const nssv_noexcept // (1)
{
if ( size() < v.size() )
{
return npos;
}
if ( v.empty() )
{
return (std::min)( size(), pos );
}
const_iterator last = cbegin() + (std::min)( size() - v.size(), pos ) + v.size();
const_iterator result = std::find_end( cbegin(), last, v.cbegin(), v.cend(), Traits::eq );
return result != last ? size_type( result - cbegin() ) : npos;
}
nssv_constexpr14 size_type rfind( CharT c, size_type pos = npos ) const nssv_noexcept // (2)
{
return rfind( basic_string_view( &c, 1 ), pos );
}
nssv_constexpr14 size_type rfind( CharT const * s, size_type pos, size_type n ) const // (3)
{
return rfind( basic_string_view( s, n ), pos );
}
nssv_constexpr14 size_type rfind( CharT const * s, size_type pos = npos ) const // (4)
{
return rfind( basic_string_view( s ), pos );
}
// find_first_of(), 4x:
nssv_constexpr size_type find_first_of( basic_string_view v, size_type pos = 0 ) const nssv_noexcept // (1)
{
return pos >= size()
? npos
: to_pos( std::find_first_of( cbegin() + pos, cend(), v.cbegin(), v.cend(), Traits::eq ) );
}
nssv_constexpr size_type find_first_of( CharT c, size_type pos = 0 ) const nssv_noexcept // (2)
{
return find_first_of( basic_string_view( &c, 1 ), pos );
}
nssv_constexpr size_type find_first_of( CharT const * s, size_type pos, size_type n ) const // (3)
{
return find_first_of( basic_string_view( s, n ), pos );
}
nssv_constexpr size_type find_first_of( CharT const * s, size_type pos = 0 ) const // (4)
{
return find_first_of( basic_string_view( s ), pos );
}
// find_last_of(), 4x:
nssv_constexpr size_type find_last_of( basic_string_view v, size_type pos = npos ) const nssv_noexcept // (1)
{
return empty()
? npos
: pos >= size()
? find_last_of( v, size() - 1 )
: to_pos( std::find_first_of( const_reverse_iterator( cbegin() + pos + 1 ), crend(), v.cbegin(), v.cend(), Traits::eq ) );
}
nssv_constexpr size_type find_last_of( CharT c, size_type pos = npos ) const nssv_noexcept // (2)
{
return find_last_of( basic_string_view( &c, 1 ), pos );
}
nssv_constexpr size_type find_last_of( CharT const * s, size_type pos, size_type count ) const // (3)
{
return find_last_of( basic_string_view( s, count ), pos );
}
nssv_constexpr size_type find_last_of( CharT const * s, size_type pos = npos ) const // (4)
{
return find_last_of( basic_string_view( s ), pos );
}
// find_first_not_of(), 4x:
nssv_constexpr size_type find_first_not_of( basic_string_view v, size_type pos = 0 ) const nssv_noexcept // (1)
{
return pos >= size()
? npos
: to_pos( std::find_if( cbegin() + pos, cend(), not_in_view( v ) ) );
}
nssv_constexpr size_type find_first_not_of( CharT c, size_type pos = 0 ) const nssv_noexcept // (2)
{
return find_first_not_of( basic_string_view( &c, 1 ), pos );
}
nssv_constexpr size_type find_first_not_of( CharT const * s, size_type pos, size_type count ) const // (3)
{
return find_first_not_of( basic_string_view( s, count ), pos );
}
nssv_constexpr size_type find_first_not_of( CharT const * s, size_type pos = 0 ) const // (4)
{
return find_first_not_of( basic_string_view( s ), pos );
}
// find_last_not_of(), 4x:
nssv_constexpr size_type find_last_not_of( basic_string_view v, size_type pos = npos ) const nssv_noexcept // (1)
{
return empty()
? npos
: pos >= size()
? find_last_not_of( v, size() - 1 )
: to_pos( std::find_if( const_reverse_iterator( cbegin() + pos + 1 ), crend(), not_in_view( v ) ) );
}
nssv_constexpr size_type find_last_not_of( CharT c, size_type pos = npos ) const nssv_noexcept // (2)
{
return find_last_not_of( basic_string_view( &c, 1 ), pos );
}
nssv_constexpr size_type find_last_not_of( CharT const * s, size_type pos, size_type count ) const // (3)
{
return find_last_not_of( basic_string_view( s, count ), pos );
}
nssv_constexpr size_type find_last_not_of( CharT const * s, size_type pos = npos ) const // (4)
{
return find_last_not_of( basic_string_view( s ), pos );
}
// Constants:
#if nssv_CPP17_OR_GREATER
static nssv_constexpr size_type npos = size_type(-1);
#elif nssv_CPP11_OR_GREATER
enum : size_type { npos = size_type(-1) };
#else
enum { npos = size_type(-1) };
#endif
private:
struct not_in_view
{
const basic_string_view v;
nssv_constexpr explicit not_in_view( basic_string_view v_ ) : v( v_ ) {}
nssv_constexpr bool operator()( CharT c ) const
{
return npos == v.find_first_of( c );
}
};
nssv_constexpr size_type to_pos( const_iterator it ) const
{
return it == cend() ? npos : size_type( it - cbegin() );
}
nssv_constexpr size_type to_pos( const_reverse_iterator it ) const
{
return it == crend() ? npos : size_type( crend() - it - 1 );
}
nssv_constexpr const_reference data_at( size_type pos ) const
{
#if nssv_BETWEEN( nssv_COMPILER_GNUC_VERSION, 1, 500 )
return data_[pos];
#else
return assert( pos < size() ), data_[pos];
#endif
}
private:
const_pointer data_;
size_type size_;
public:
#if nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS
template< class Allocator >
basic_string_view( std::basic_string<CharT, Traits, Allocator> const & s ) nssv_noexcept
: data_( s.data() )
, size_( s.size() )
{}
#if nssv_HAVE_EXPLICIT_CONVERSION
template< class Allocator >
explicit operator std::basic_string<CharT, Traits, Allocator>() const
{
return to_string( Allocator() );
}
#endif // nssv_HAVE_EXPLICIT_CONVERSION
#if nssv_CPP11_OR_GREATER
template< class Allocator = std::allocator<CharT> >
std::basic_string<CharT, Traits, Allocator>
to_string( Allocator const & a = Allocator() ) const
{
return std::basic_string<CharT, Traits, Allocator>( begin(), end(), a );
}
#else
std::basic_string<CharT, Traits>
to_string() const
{
return std::basic_string<CharT, Traits>( begin(), end() );
}
template< class Allocator >
std::basic_string<CharT, Traits, Allocator>
to_string( Allocator const & a ) const
{
return std::basic_string<CharT, Traits, Allocator>( begin(), end(), a );
}
#endif // nssv_CPP11_OR_GREATER
#endif // nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS
};
//
// Non-member functions:
//
// 24.4.3 Non-member comparison functions:
// lexicographically compare two string views (function template):
template< class CharT, class Traits >
nssv_constexpr bool operator== (
basic_string_view <CharT, Traits> lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return lhs.size() == rhs.size() && lhs.compare( rhs ) == 0; }
template< class CharT, class Traits >
nssv_constexpr bool operator!= (
basic_string_view <CharT, Traits> lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return !( lhs == rhs ); }
template< class CharT, class Traits >
nssv_constexpr bool operator< (
basic_string_view <CharT, Traits> lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) < 0; }
template< class CharT, class Traits >
nssv_constexpr bool operator<= (
basic_string_view <CharT, Traits> lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) <= 0; }
template< class CharT, class Traits >
nssv_constexpr bool operator> (
basic_string_view <CharT, Traits> lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) > 0; }
template< class CharT, class Traits >
nssv_constexpr bool operator>= (
basic_string_view <CharT, Traits> lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) >= 0; }
// Let S be basic_string_view<CharT, Traits>, and sv be an instance of S.
// Implementations shall provide sufficient additional overloads marked
// constexpr and noexcept so that an object t with an implicit conversion
// to S can be compared according to Table 67.
#if ! nssv_CPP11_OR_GREATER || nssv_BETWEEN( nssv_COMPILER_MSVC_VERSION, 100, 141 )
// accommodate for older compilers:
// ==
template< class CharT, class Traits>
nssv_constexpr bool operator==(
basic_string_view<CharT, Traits> lhs,
CharT const * rhs ) nssv_noexcept
{ return lhs.size() == detail::length( rhs ) && lhs.compare( rhs ) == 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator==(
CharT const * lhs,
basic_string_view<CharT, Traits> rhs ) nssv_noexcept
{ return detail::length( lhs ) == rhs.size() && rhs.compare( lhs ) == 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator==(
basic_string_view<CharT, Traits> lhs,
std::basic_string<CharT, Traits> rhs ) nssv_noexcept
{ return lhs.size() == rhs.size() && lhs.compare( rhs ) == 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator==(
std::basic_string<CharT, Traits> rhs,
basic_string_view<CharT, Traits> lhs ) nssv_noexcept
{ return lhs.size() == rhs.size() && lhs.compare( rhs ) == 0; }
// !=
template< class CharT, class Traits>
nssv_constexpr bool operator!=(
basic_string_view<CharT, Traits> lhs,
CharT const * rhs ) nssv_noexcept
{ return !( lhs == rhs ); }
template< class CharT, class Traits>
nssv_constexpr bool operator!=(
CharT const * lhs,
basic_string_view<CharT, Traits> rhs ) nssv_noexcept
{ return !( lhs == rhs ); }
template< class CharT, class Traits>
nssv_constexpr bool operator!=(
basic_string_view<CharT, Traits> lhs,
std::basic_string<CharT, Traits> rhs ) nssv_noexcept
{ return !( lhs == rhs ); }
template< class CharT, class Traits>
nssv_constexpr bool operator!=(
std::basic_string<CharT, Traits> rhs,
basic_string_view<CharT, Traits> lhs ) nssv_noexcept
{ return !( lhs == rhs ); }
// <
template< class CharT, class Traits>
nssv_constexpr bool operator<(
basic_string_view<CharT, Traits> lhs,
CharT const * rhs ) nssv_noexcept
{ return lhs.compare( rhs ) < 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator<(
CharT const * lhs,
basic_string_view<CharT, Traits> rhs ) nssv_noexcept
{ return rhs.compare( lhs ) > 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator<(
basic_string_view<CharT, Traits> lhs,
std::basic_string<CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) < 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator<(
std::basic_string<CharT, Traits> rhs,
basic_string_view<CharT, Traits> lhs ) nssv_noexcept
{ return rhs.compare( lhs ) > 0; }
// <=
template< class CharT, class Traits>
nssv_constexpr bool operator<=(
basic_string_view<CharT, Traits> lhs,
CharT const * rhs ) nssv_noexcept
{ return lhs.compare( rhs ) <= 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator<=(
CharT const * lhs,
basic_string_view<CharT, Traits> rhs ) nssv_noexcept
{ return rhs.compare( lhs ) >= 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator<=(
basic_string_view<CharT, Traits> lhs,
std::basic_string<CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) <= 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator<=(
std::basic_string<CharT, Traits> rhs,
basic_string_view<CharT, Traits> lhs ) nssv_noexcept
{ return rhs.compare( lhs ) >= 0; }
// >
template< class CharT, class Traits>
nssv_constexpr bool operator>(
basic_string_view<CharT, Traits> lhs,
CharT const * rhs ) nssv_noexcept
{ return lhs.compare( rhs ) > 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator>(
CharT const * lhs,
basic_string_view<CharT, Traits> rhs ) nssv_noexcept
{ return rhs.compare( lhs ) < 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator>(
basic_string_view<CharT, Traits> lhs,
std::basic_string<CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) > 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator>(
std::basic_string<CharT, Traits> rhs,
basic_string_view<CharT, Traits> lhs ) nssv_noexcept
{ return rhs.compare( lhs ) < 0; }
// >=
template< class CharT, class Traits>
nssv_constexpr bool operator>=(
basic_string_view<CharT, Traits> lhs,
CharT const * rhs ) nssv_noexcept
{ return lhs.compare( rhs ) >= 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator>=(
CharT const * lhs,
basic_string_view<CharT, Traits> rhs ) nssv_noexcept
{ return rhs.compare( lhs ) <= 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator>=(
basic_string_view<CharT, Traits> lhs,
std::basic_string<CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) >= 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator>=(
std::basic_string<CharT, Traits> rhs,
basic_string_view<CharT, Traits> lhs ) nssv_noexcept
{ return rhs.compare( lhs ) <= 0; }
#else // newer compilers:
#define nssv_BASIC_STRING_VIEW_I(T,U) typename std::decay< basic_string_view<T,U> >::type
#if defined(_MSC_VER) // issue 40
# define nssv_MSVC_ORDER(x) , int=x
#else
# define nssv_MSVC_ORDER(x) /*, int=x*/
#endif
// ==
template< class CharT, class Traits nssv_MSVC_ORDER(1) >
nssv_constexpr bool operator==(
basic_string_view <CharT, Traits> lhs,
nssv_BASIC_STRING_VIEW_I(CharT, Traits) rhs ) nssv_noexcept
{ return lhs.size() == rhs.size() && lhs.compare( rhs ) == 0; }
template< class CharT, class Traits nssv_MSVC_ORDER(2) >
nssv_constexpr bool operator==(
nssv_BASIC_STRING_VIEW_I(CharT, Traits) lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return lhs.size() == rhs.size() && lhs.compare( rhs ) == 0; }
// !=
template< class CharT, class Traits nssv_MSVC_ORDER(1) >
nssv_constexpr bool operator!= (
basic_string_view < CharT, Traits > lhs,
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) rhs ) nssv_noexcept
{ return !( lhs == rhs ); }
template< class CharT, class Traits nssv_MSVC_ORDER(2) >
nssv_constexpr bool operator!= (
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) lhs,
basic_string_view < CharT, Traits > rhs ) nssv_noexcept
{ return !( lhs == rhs ); }
// <
template< class CharT, class Traits nssv_MSVC_ORDER(1) >
nssv_constexpr bool operator< (
basic_string_view < CharT, Traits > lhs,
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) rhs ) nssv_noexcept
{ return lhs.compare( rhs ) < 0; }
template< class CharT, class Traits nssv_MSVC_ORDER(2) >
nssv_constexpr bool operator< (
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) lhs,
basic_string_view < CharT, Traits > rhs ) nssv_noexcept
{ return lhs.compare( rhs ) < 0; }
// <=
template< class CharT, class Traits nssv_MSVC_ORDER(1) >
nssv_constexpr bool operator<= (
basic_string_view < CharT, Traits > lhs,
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) rhs ) nssv_noexcept
{ return lhs.compare( rhs ) <= 0; }
template< class CharT, class Traits nssv_MSVC_ORDER(2) >
nssv_constexpr bool operator<= (
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) lhs,
basic_string_view < CharT, Traits > rhs ) nssv_noexcept
{ return lhs.compare( rhs ) <= 0; }
// >
template< class CharT, class Traits nssv_MSVC_ORDER(1) >
nssv_constexpr bool operator> (
basic_string_view < CharT, Traits > lhs,
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) rhs ) nssv_noexcept
{ return lhs.compare( rhs ) > 0; }
template< class CharT, class Traits nssv_MSVC_ORDER(2) >
nssv_constexpr bool operator> (
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) lhs,
basic_string_view < CharT, Traits > rhs ) nssv_noexcept
{ return lhs.compare( rhs ) > 0; }
// >=
template< class CharT, class Traits nssv_MSVC_ORDER(1) >
nssv_constexpr bool operator>= (
basic_string_view < CharT, Traits > lhs,
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) rhs ) nssv_noexcept
{ return lhs.compare( rhs ) >= 0; }
template< class CharT, class Traits nssv_MSVC_ORDER(2) >
nssv_constexpr bool operator>= (
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) lhs,
basic_string_view < CharT, Traits > rhs ) nssv_noexcept
{ return lhs.compare( rhs ) >= 0; }
#undef nssv_MSVC_ORDER
#undef nssv_BASIC_STRING_VIEW_I
#endif // compiler-dependent approach to comparisons
// 24.4.4 Inserters and extractors:
#if ! nssv_CONFIG_NO_STREAM_INSERTION
namespace detail {
template< class Stream >
void write_padding( Stream & os, std::streamsize n )
{
for ( std::streamsize i = 0; i < n; ++i )
os.rdbuf()->sputc( os.fill() );
}
template< class Stream, class View >
Stream & write_to_stream( Stream & os, View const & sv )
{
typename Stream::sentry sentry( os );
if ( !sentry )
return os;
const std::streamsize length = static_cast<std::streamsize>( sv.length() );
// Whether, and how, to pad:
const bool pad = ( length < os.width() );
const bool left_pad = pad && ( os.flags() & std::ios_base::adjustfield ) == std::ios_base::right;
if ( left_pad )
write_padding( os, os.width() - length );
// Write span characters:
os.rdbuf()->sputn( sv.begin(), length );
if ( pad && !left_pad )
write_padding( os, os.width() - length );
// Reset output stream width:
os.width( 0 );
return os;
}
} // namespace detail
template< class CharT, class Traits >
std::basic_ostream<CharT, Traits> &
operator<<(
std::basic_ostream<CharT, Traits>& os,
basic_string_view <CharT, Traits> sv )
{
return detail::write_to_stream( os, sv );
}
#endif // nssv_CONFIG_NO_STREAM_INSERTION
// Several typedefs for common character types are provided:
typedef basic_string_view<char> string_view;
typedef basic_string_view<wchar_t> wstring_view;
#if nssv_HAVE_WCHAR16_T
typedef basic_string_view<char16_t> u16string_view;
typedef basic_string_view<char32_t> u32string_view;
#endif
}} // namespace nonstd::sv_lite
//
// 24.4.6 Suffix for basic_string_view literals:
//
#if nssv_HAVE_USER_DEFINED_LITERALS
namespace nonstd {
nssv_inline_ns namespace literals {
nssv_inline_ns namespace string_view_literals {
#if nssv_CONFIG_STD_SV_OPERATOR && nssv_HAVE_STD_DEFINED_LITERALS
nssv_constexpr nonstd::sv_lite::string_view operator "" sv( const char* str, size_t len ) nssv_noexcept // (1)
{
return nonstd::sv_lite::string_view{ str, len };
}
nssv_constexpr nonstd::sv_lite::u16string_view operator "" sv( const char16_t* str, size_t len ) nssv_noexcept // (2)
{
return nonstd::sv_lite::u16string_view{ str, len };
}
nssv_constexpr nonstd::sv_lite::u32string_view operator "" sv( const char32_t* str, size_t len ) nssv_noexcept // (3)
{
return nonstd::sv_lite::u32string_view{ str, len };
}
nssv_constexpr nonstd::sv_lite::wstring_view operator "" sv( const wchar_t* str, size_t len ) nssv_noexcept // (4)
{
return nonstd::sv_lite::wstring_view{ str, len };
}
#endif // nssv_CONFIG_STD_SV_OPERATOR && nssv_HAVE_STD_DEFINED_LITERALS
#if nssv_CONFIG_USR_SV_OPERATOR
nssv_constexpr nonstd::sv_lite::string_view operator "" _sv( const char* str, size_t len ) nssv_noexcept // (1)
{
return nonstd::sv_lite::string_view{ str, len };
}
nssv_constexpr nonstd::sv_lite::u16string_view operator "" _sv( const char16_t* str, size_t len ) nssv_noexcept // (2)
{
return nonstd::sv_lite::u16string_view{ str, len };
}
nssv_constexpr nonstd::sv_lite::u32string_view operator "" _sv( const char32_t* str, size_t len ) nssv_noexcept // (3)
{
return nonstd::sv_lite::u32string_view{ str, len };
}
nssv_constexpr nonstd::sv_lite::wstring_view operator "" _sv( const wchar_t* str, size_t len ) nssv_noexcept // (4)
{
return nonstd::sv_lite::wstring_view{ str, len };
}
#endif // nssv_CONFIG_USR_SV_OPERATOR
}}} // namespace nonstd::literals::string_view_literals
#endif
//
// Extensions for std::string:
//
#if nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
namespace nonstd {
namespace sv_lite {
// Exclude MSVC 14 (19.00): it yields ambiguous to_string():
#if nssv_CPP11_OR_GREATER && nssv_COMPILER_MSVC_VERSION != 140
template< class CharT, class Traits, class Allocator = std::allocator<CharT> >
std::basic_string<CharT, Traits, Allocator>
to_string( basic_string_view<CharT, Traits> v, Allocator const & a = Allocator() )
{
return std::basic_string<CharT,Traits, Allocator>( v.begin(), v.end(), a );
}
#else
template< class CharT, class Traits >
std::basic_string<CharT, Traits>
to_string( basic_string_view<CharT, Traits> v )
{
return std::basic_string<CharT, Traits>( v.begin(), v.end() );
}
template< class CharT, class Traits, class Allocator >
std::basic_string<CharT, Traits, Allocator>
to_string( basic_string_view<CharT, Traits> v, Allocator const & a )
{
return std::basic_string<CharT, Traits, Allocator>( v.begin(), v.end(), a );
}
#endif // nssv_CPP11_OR_GREATER
template< class CharT, class Traits, class Allocator >
basic_string_view<CharT, Traits>
to_string_view( std::basic_string<CharT, Traits, Allocator> const & s )
{
return basic_string_view<CharT, Traits>( s.data(), s.size() );
}
}} // namespace nonstd::sv_lite
#endif // nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
//
// make types and algorithms available in namespace nonstd:
//
namespace nonstd {
using sv_lite::basic_string_view;
using sv_lite::string_view;
using sv_lite::wstring_view;
#if nssv_HAVE_WCHAR16_T
using sv_lite::u16string_view;
#endif
#if nssv_HAVE_WCHAR32_T
using sv_lite::u32string_view;
#endif
// literal "sv"
using sv_lite::operator==;
using sv_lite::operator!=;
using sv_lite::operator<;
using sv_lite::operator<=;
using sv_lite::operator>;
using sv_lite::operator>=;
#if ! nssv_CONFIG_NO_STREAM_INSERTION
using sv_lite::operator<<;
#endif
#if nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
using sv_lite::to_string;
using sv_lite::to_string_view;
#endif
} // namespace nonstd
// 24.4.5 Hash support (C++11):
// Note: The hash value of a string view object is equal to the hash value of
// the corresponding string object.
#if nssv_HAVE_STD_HASH
#include <functional>
namespace std {
template<>
struct hash< nonstd::string_view >
{
public:
std::size_t operator()( nonstd::string_view v ) const nssv_noexcept
{
return std::hash<std::string>()( std::string( v.data(), v.size() ) );
}
};
template<>
struct hash< nonstd::wstring_view >
{
public:
std::size_t operator()( nonstd::wstring_view v ) const nssv_noexcept
{
return std::hash<std::wstring>()( std::wstring( v.data(), v.size() ) );
}
};
template<>
struct hash< nonstd::u16string_view >
{
public:
std::size_t operator()( nonstd::u16string_view v ) const nssv_noexcept
{
return std::hash<std::u16string>()( std::u16string( v.data(), v.size() ) );
}
};
template<>
struct hash< nonstd::u32string_view >
{
public:
std::size_t operator()( nonstd::u32string_view v ) const nssv_noexcept
{
return std::hash<std::u32string>()( std::u32string( v.data(), v.size() ) );
}
};
} // namespace std
#endif // nssv_HAVE_STD_HASH
nssv_RESTORE_WARNINGS()
#endif // nssv_HAVE_STD_STRING_VIEW
#endif // NONSTD_SV_LITE_H_INCLUDED
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