1 // boost cxx11_char_types.hpp --------------------------------------------------------// 2 3 // Copyright Beman Dawes 2011 4 5 // Distributed under the Boost Software License, Version 1.0. 6 // See http://www.boost.org/LICENSE_1_0.txt 7 8 //--------------------------------------------------------------------------------------// 9 // // 10 // The purpose of this header is to emulate the C++11 char16_t and char32_t // 11 // character and string types so that they can be used in both C++11 and C++03 // 12 // programs. // 13 // // 14 // The emulation names use char16/char32 rather than char16_t/char32_t to avoid use // 15 // of names that are keywords in C++11. // 16 // // 17 // The emulation names are placed in namespace boost, as is usual for Boost C++11 // 18 // emulation names such as those in header <boost/cstdint.hpp>. // 19 // // 20 // An alternative would would have been to place the C++11 emulation names at global // 21 // scope, and put the C++11 string types in namespace std. That is the approach taken // 22 // by Microsoft Visual Studio 2010, but is controversion with some Boost users and // 23 // developers, and runs counter to usual Boost practice. // 24 // // 25 // Thanks to Mathias Gaunard and others for discussions leading to the final form // 26 // of these typedefs. // 27 // // 28 // Boost C++11 C++03 // 29 // ---------------- -------------- -------------------------------- // 30 // boost::char16 char16_t uint16_t // 31 // boost::char32 char32_t uint32_t // 32 // boost::u16string std::u16string std::basic_string<boost::char16> // 33 // boost::u32string std::u32string std::basic_string<boost::char32> // 34 // // 35 // Uses the typedefs provided by Microsoft Visual C++ 2010 if present // 36 // // 37 // Thanks to Mathias Gaunard and others for discussions leading to the final form // 38 // of these typedefs. // 39 // // 40 //--------------------------------------------------------------------------------------// 41 42 #if !defined(BOOST_CXX11_CHAR_TYPES_HPP) 43 # define BOOST_CXX11_CHAR_TYPES_HPP 44 45 # include <boost/config.hpp> 46 # include <boost/cstdint.hpp> 47 # include <string> 48 49 namespace boost 50 { 51 52 # if defined(BOOST_NO_CHAR16_T) && (!defined(_MSC_VER) || _MSC_VER < 1600) // 1600 == VC++10 53 typedef boost::uint_least16_t char16; 54 typedef std::basic_string<boost::char16> u16string; 55 # else 56 typedef char16_t char16; 57 typedef std::u16string u16string; 58 # endif 59 60 # if defined(BOOST_NO_CHAR32_T) && (!defined(_MSC_VER) || _MSC_VER < 1600) // 1600 == VC++10 61 typedef boost::uint_least32_t char32; 62 typedef std::basic_string<boost::char32> u32string; 63 # else 64 typedef char32_t char32; 65 typedef std::u32string u32string; 66 # endif 67 68 } // namespace boost 69 70 #endif // !defined(BOOST_CXX11_CHAR_TYPES_HPP) 71