stringfwd.h

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// <string> Forward declarations -*- C++ -*-
 
// Copyright (C) 2001-2026 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
 
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
 
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.
 
/** @file bits/stringfwd.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{string}
 */
 
//
// ISO C++ 14882: 21 Strings library
//
 
#ifndef _STRINGFWD_H
#define _STRINGFWD_H 1
 
#ifdef _GLIBCXX_SYSHDR
#pragma GCC system_header
#endif
 
#include <bits/c++config.h>
#include <bits/memoryfwd.h>
 
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
 
  /**
   *  @defgroup strings Strings
   *
   *  @{
  */
 
  template<class _CharT>
    struct char_traits;
 
  template<> struct char_traits<char>;
 
  template<> struct char_traits<wchar_t>;
 
#ifdef _GLIBCXX_USE_CHAR8_T
  template<> struct char_traits<char8_t>;
#endif
 
#if __cplusplus >= 201103L
  template<> struct char_traits<char16_t>;
  template<> struct char_traits<char32_t>;
#endif
 
_GLIBCXX_BEGIN_NAMESPACE_CXX11
 
  template<typename _CharT, typename _Traits = char_traits<_CharT>,
           typename _Alloc = allocator<_CharT> >
    class basic_string;
 
_GLIBCXX_END_NAMESPACE_CXX11
 
  /// A string of @c char
  typedef basic_string<char>    string;
 
  /// A string of @c wchar_t
  typedef basic_string<wchar_t> wstring;
 
#ifdef _GLIBCXX_USE_CHAR8_T
  /// A string of @c char8_t
  typedef basic_string<char8_t> u8string;
#endif
 
#if __cplusplus >= 201103L
  /// A string of @c char16_t
  typedef basic_string<char16_t> u16string;
 
  /// A string of @c char32_t
  typedef basic_string<char32_t> u32string;
#endif
 
  /** @}  */
 
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
 
#endif  // _STRINGFWD_H