libstdc++-v3/include/bits/stringfwd.h

   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