1 // <string> Forward declarations -*- C++ -*- 2 3 // Copyright (C) 2001-2020 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file bits/stringfwd.h 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{string} 28 */ 29 30 // 31 // ISO C++ 14882: 21 Strings library 32 // 33 34 #ifndef _STRINGFWD_H 35 #define _STRINGFWD_H 1 36 37 #pragma GCC system_header 38 39 #include <bits/c++config.h> 40 #include <bits/memoryfwd.h> 41 42 namespace std _GLIBCXX_VISIBILITY(default) 43 { 44 _GLIBCXX_BEGIN_NAMESPACE_VERSION 45 46 /** 47 * @defgroup strings Strings 48 * 49 * @{ 50 */ 51 52 template<class _CharT> 53 struct char_traits; 54 55 template<> struct char_traits<char>; 56 57 #ifdef _GLIBCXX_USE_WCHAR_T 58 template<> struct char_traits<wchar_t>; 59 #endif 60 61 #ifdef _GLIBCXX_USE_CHAR8_T 62 template<> struct char_traits<char8_t>; 63 #endif 64 65 #if __cplusplus >= 201103L 66 template<> struct char_traits<char16_t>; 67 template<> struct char_traits<char32_t>; 68 #endif 69 70 _GLIBCXX_BEGIN_NAMESPACE_CXX11 71 72 template<typename _CharT, typename _Traits = char_traits<_CharT>, 73 typename _Alloc = allocator<_CharT> > 74 class basic_string; 75 76 _GLIBCXX_END_NAMESPACE_CXX11 77 78 /// A string of @c char 79 typedef basic_string<char> string; 80 81 #ifdef _GLIBCXX_USE_WCHAR_T 82 /// A string of @c wchar_t 83 typedef basic_string<wchar_t> wstring; 84 #endif 85 86 #ifdef _GLIBCXX_USE_CHAR8_T 87 /// A string of @c char8_t 88 typedef basic_string<char8_t> u8string; 89 #endif 90 91 #if __cplusplus >= 201103L 92 /// A string of @c char16_t 93 typedef basic_string<char16_t> u16string; 94 95 /// A string of @c char32_t 96 typedef basic_string<char32_t> u32string; 97 #endif 98 99 /** @} */ 100 101 _GLIBCXX_END_NAMESPACE_VERSION 102 } // namespace std 103 104 #endif // _STRINGFWD_H 105