iosfwd_span.h

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// <iosfwd> Forward declarations for <spanstream> -*- C++ -*-
 
// Copyright (C) 2022-2026 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 include/bits/iosfwd_span.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{iosfwd}
 */
 
#ifndef _GLIBCXX_IOSFWD_SPAN_H
#define _GLIBCXX_IOSFWD_SPAN_H 1
 
#ifdef _GLIBCXX_SYSHDR
#pragma GCC system_header
#endif
 
#include <bits/requires_hosted.h> // iostreams
 
#include <bits/version.h>
 
#ifdef __glibcxx_spanstream // >= C++23
#include <bits/iosfwd.h>
 
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
 
  /**
   *  @addtogroup io
   *  @{
  */
 
  template<typename _CharT, typename _Traits = char_traits<_CharT>>
    class basic_spanbuf;
  template<typename _CharT, typename _Traits = char_traits<_CharT>>
    class basic_ispanstream;
  template<typename _CharT, typename _Traits = char_traits<_CharT>>
    class basic_ospanstream;
  template<typename _CharT, typename _Traits = char_traits<_CharT>>
    class basic_spanstream;
 
  using spanbuf     = basic_spanbuf<char>;
  using ispanstream = basic_ispanstream<char>;
  using ospanstream = basic_ospanstream<char>;
  using spanstream  = basic_spanstream<char>;
 
#ifdef _GLIBCXX_USE_WCHAR_T
  using wspanbuf     = basic_spanbuf<wchar_t>;
  using wispanstream = basic_ispanstream<wchar_t>;
  using wospanstream = basic_ospanstream<wchar_t>;
  using wspanstream  = basic_spanstream<wchar_t>;
#endif
  /// @}
 
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif // C++23
#endif /* _GLIBCXX_IOSFWD_SPAN_H */