ceph/src/boost/boost/log/detail/code_conversion.hpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2015.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   code_conversion.hpp
   9  * \author Andrey Semashev
  10  * \date   08.11.2008
  11  *
  12  * \brief  This header is the Boost.Log library implementation, see the library documentation
  13  *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
  14  */
  15
  16 #ifndef BOOST_LOG_DETAIL_CODE_CONVERSION_HPP_INCLUDED_
  17 #define BOOST_LOG_DETAIL_CODE_CONVERSION_HPP_INCLUDED_
  18
  19 #include <cstddef>
  20 #include <locale>
  21 #include <string>
  22 #include <boost/core/enable_if.hpp>
  23 #include <boost/log/detail/config.hpp>
  24 #include <boost/log/detail/is_character_type.hpp>
  25 #include <boost/log/detail/header.hpp>
  26
  27 #ifdef BOOST_HAS_PRAGMA_ONCE
  28 #pragma once
  29 #endif
  30
  31 namespace boost {
  32
  33 BOOST_LOG_OPEN_NAMESPACE
  34
  35 namespace aux {
  36
  37 // Implementation note: We have to implement char<->wchar_t conversions even in the absence of the native wchar_t
  38 // type. These conversions are used in sinks, e.g. to convert multibyte strings to wide-character filesystem paths.
  39
  40 //! The function converts one string to the character type of another
  41 BOOST_LOG_API bool code_convert_impl(const wchar_t* str1, std::size_t len, std::string& str2, std::size_t max_size, std::locale const& loc = std::locale());
  42 //! The function converts one string to the character type of another
  43 BOOST_LOG_API bool code_convert_impl(const char* str1, std::size_t len, std::wstring& str2, std::size_t max_size, std::locale const& loc = std::locale());
  44
  45 #if !defined(BOOST_LOG_NO_CXX11_CODECVT_FACETS)
  46 #if !defined(BOOST_NO_CXX11_CHAR16_T)
  47 //! The function converts one string to the character type of another
  48 BOOST_LOG_API bool code_convert_impl(const char16_t* str1, std::size_t len, std::string& str2, std::size_t max_size, std::locale const& loc = std::locale());
  49 //! The function converts one string to the character type of another
  50 BOOST_LOG_API bool code_convert_impl(const char* str1, std::size_t len, std::u16string& str2, std::size_t max_size, std::locale const& loc = std::locale());
  51 //! The function converts one string to the character type of another
  52 BOOST_LOG_API bool code_convert_impl(const char16_t* str1, std::size_t len, std::wstring& str2, std::size_t max_size, std::locale const& loc = std::locale());
  53 #endif
  54 #if !defined(BOOST_NO_CXX11_CHAR32_T)
  55 //! The function converts one string to the character type of another
  56 BOOST_LOG_API bool code_convert_impl(const char32_t* str1, std::size_t len, std::string& str2, std::size_t max_size, std::locale const& loc = std::locale());
  57 //! The function converts one string to the character type of another
  58 BOOST_LOG_API bool code_convert_impl(const char* str1, std::size_t len, std::u32string& str2, std::size_t max_size, std::locale const& loc = std::locale());
  59 //! The function converts one string to the character type of another
  60 BOOST_LOG_API bool code_convert_impl(const char32_t* str1, std::size_t len, std::wstring& str2, std::size_t max_size, std::locale const& loc = std::locale());
  61 #endif
  62 #if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_CHAR32_T)
  63 //! The function converts one string to the character type of another
  64 BOOST_LOG_API bool code_convert_impl(const char16_t* str1, std::size_t len, std::u32string& str2, std::size_t max_size, std::locale const& loc = std::locale());
  65 //! The function converts one string to the character type of another
  66 BOOST_LOG_API bool code_convert_impl(const char32_t* str1, std::size_t len, std::u16string& str2, std::size_t max_size, std::locale const& loc = std::locale());
  67 #endif
  68 #endif // !defined(BOOST_LOG_NO_CXX11_CODECVT_FACETS)
  69
  70 //! The function converts one string to the character type of another
  71 template< typename SourceCharT, typename TargetCharT, typename TargetTraitsT, typename TargetAllocatorT >
  72 inline typename boost::enable_if_c< is_character_type< SourceCharT >::value && is_character_type< TargetCharT >::value && sizeof(SourceCharT) == sizeof(TargetCharT), bool >::type
  73 code_convert(const SourceCharT* str1, std::size_t len, std::basic_string< TargetCharT, TargetTraitsT, TargetAllocatorT >& str2, std::size_t max_size, std::locale const& = std::locale())
  74 {
  75     std::size_t size_left = str2.size() < max_size ? max_size - str2.size() : static_cast< std::size_t >(0u);
  76     const bool overflow = len > size_left;
  77     str2.append(reinterpret_cast< const TargetCharT* >(str1), overflow ? size_left : len);
  78     return !overflow;
  79 }
  80
  81 //! The function converts one string to the character type of another
  82 template< typename SourceCharT, typename SourceTraitsT, typename SourceAllocatorT, typename TargetCharT, typename TargetTraitsT, typename TargetAllocatorT >
  83 inline typename boost::enable_if_c< is_character_type< SourceCharT >::value && is_character_type< TargetCharT >::value && sizeof(SourceCharT) == sizeof(TargetCharT), bool >::type
  84 code_convert(std::basic_string< SourceCharT, SourceTraitsT, SourceAllocatorT > const& str1, std::basic_string< TargetCharT, TargetTraitsT, TargetAllocatorT >& str2, std::size_t max_size, std::locale const& loc = std::locale())
  85 {
  86     return aux::code_convert(str1.data(), str1.size(), str2, max_size, loc);
  87 }
  88
  89 //! The function converts one string to the character type of another
  90 template< typename SourceCharT, typename SourceTraitsT, typename SourceAllocatorT, typename TargetCharT, typename TargetTraitsT, typename TargetAllocatorT >
  91 inline typename boost::enable_if_c< is_character_type< SourceCharT >::value && is_character_type< TargetCharT >::value && sizeof(SourceCharT) == sizeof(TargetCharT), bool >::type
  92 code_convert(std::basic_string< SourceCharT, SourceTraitsT, SourceAllocatorT > const& str1, std::basic_string< TargetCharT, TargetTraitsT, TargetAllocatorT >& str2, std::locale const& loc = std::locale())
  93 {
  94     return aux::code_convert(str1.data(), str1.size(), str2, str2.max_size(), loc);
  95 }
  96 //! The function converts one string to the character type of another
  97 template< typename SourceCharT, typename TargetCharT, typename TargetTraitsT, typename TargetAllocatorT >
  98 inline typename boost::enable_if_c< is_character_type< SourceCharT >::value && is_character_type< TargetCharT >::value && sizeof(SourceCharT) == sizeof(TargetCharT), bool >::type
  99 code_convert(const SourceCharT* str1, std::size_t len, std::basic_string< TargetCharT, TargetTraitsT, TargetAllocatorT >& str2, std::locale const& loc = std::locale())
 100 {
 101     return aux::code_convert(str1, len, str2, str2.max_size(), loc);
 102 }
 103
 104 //! The function converts one string to the character type of another
 105 template< typename SourceCharT, typename SourceTraitsT, typename SourceAllocatorT, typename TargetCharT, typename TargetTraitsT, typename TargetAllocatorT >
 106 inline typename boost::enable_if_c< is_character_type< SourceCharT >::value && is_character_type< TargetCharT >::value && sizeof(SourceCharT) != sizeof(TargetCharT), bool >::type
 107 code_convert(std::basic_string< SourceCharT, SourceTraitsT, SourceAllocatorT > const& str1, std::basic_string< TargetCharT, TargetTraitsT, TargetAllocatorT >& str2, std::locale const& loc = std::locale())
 108 {
 109     return aux::code_convert_impl(str1.c_str(), str1.size(), str2, str2.max_size(), loc);
 110 }
 111
 112 //! The function converts one string to the character type of another
 113 template< typename SourceCharT, typename TargetCharT, typename TargetTraitsT, typename TargetAllocatorT >
 114 inline typename boost::enable_if_c< is_character_type< SourceCharT >::value && is_character_type< TargetCharT >::value && sizeof(SourceCharT) != sizeof(TargetCharT), bool >::type
 115 code_convert(const SourceCharT* str1, std::size_t len, std::basic_string< TargetCharT, TargetTraitsT, TargetAllocatorT >& str2, std::locale const& loc = std::locale())
 116 {
 117     return aux::code_convert_impl(str1, len, str2, str2.max_size(), loc);
 118 }
 119
 120 //! The function converts one string to the character type of another
 121 template< typename SourceCharT, typename SourceTraitsT, typename SourceAllocatorT, typename TargetCharT, typename TargetTraitsT, typename TargetAllocatorT >
 122 inline typename boost::enable_if_c< is_character_type< SourceCharT >::value && is_character_type< TargetCharT >::value && sizeof(SourceCharT) != sizeof(TargetCharT), bool >::type
 123 code_convert(std::basic_string< SourceCharT, SourceTraitsT, SourceAllocatorT > const& str1, std::basic_string< TargetCharT, TargetTraitsT, TargetAllocatorT >& str2, std::size_t max_size, std::locale const& loc = std::locale())
 124 {
 125     return aux::code_convert_impl(str1.c_str(), str1.size(), str2, max_size, loc);
 126 }
 127
 128 //! The function converts one string to the character type of another
 129 template< typename SourceCharT, typename TargetCharT, typename TargetTraitsT, typename TargetAllocatorT >
 130 inline typename boost::enable_if_c< is_character_type< SourceCharT >::value && is_character_type< TargetCharT >::value && sizeof(SourceCharT) != sizeof(TargetCharT), bool >::type
 131 code_convert(const SourceCharT* str1, std::size_t len, std::basic_string< TargetCharT, TargetTraitsT, TargetAllocatorT >& str2, std::size_t max_size, std::locale const& loc = std::locale())
 132 {
 133     return aux::code_convert_impl(str1, len, str2, max_size, loc);
 134 }
 135
 136 //! The function converts the passed string to the narrow-character encoding
 137 inline std::string const& to_narrow(std::string const& str)
 138 {
 139     return str;
 140 }
 141
 142 //! The function converts the passed string to the narrow-character encoding
 143 inline std::string const& to_narrow(std::string const& str, std::locale const&)
 144 {
 145     return str;
 146 }
 147
 148 //! The function converts the passed string to the narrow-character encoding
 149 inline std::string to_narrow(std::wstring const& str, std::locale const& loc = std::locale())
 150 {
 151     std::string res;
 152     aux::code_convert_impl(str.c_str(), str.size(), res, res.max_size(), loc);
 153 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && !defined(BOOST_HAS_NRVO)
 154     return static_cast< std::string&& >(res);
 155 #else
 156     return res;
 157 #endif
 158 }
 159
 160 //! The function converts the passed string to the wide-character encoding
 161 inline std::wstring const& to_wide(std::wstring const& str)
 162 {
 163     return str;
 164 }
 165
 166 //! The function converts the passed string to the wide-character encoding
 167 inline std::wstring const& to_wide(std::wstring const& str, std::locale const&)
 168 {
 169     return str;
 170 }
 171
 172 //! The function converts the passed string to the wide-character encoding
 173 inline std::wstring to_wide(std::string const& str, std::locale const& loc = std::locale())
 174 {
 175     std::wstring res;
 176     aux::code_convert_impl(str.c_str(), str.size(), res, res.max_size(), loc);
 177 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && !defined(BOOST_HAS_NRVO)
 178     return static_cast< std::wstring&& >(res);
 179 #else
 180     return res;
 181 #endif
 182 }
 183
 184 } // namespace aux
 185
 186 BOOST_LOG_CLOSE_NAMESPACE // namespace log
 187
 188 } // namespace boost
 189
 190 #include <boost/log/detail/footer.hpp>
 191
 192 #endif // BOOST_LOG_DETAIL_CODE_CONVERSION_HPP_INCLUDED_