1  // filebuf with encoding state type -*- C++ -*-
       2  
       3  // Copyright (C) 2002-2023 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 ext/enc_filebuf.h
      26   *  This file is a GNU extension to the Standard C++ Library.
      27   */
      28  
      29  #ifndef _EXT_ENC_FILEBUF_H
      30  #define _EXT_ENC_FILEBUF_H 1
      31  
      32  #include <bits/requires_hosted.h> // GNU extensions are currently omitted
      33  
      34  #include <fstream>
      35  #include <locale>
      36  #include <ext/codecvt_specializations.h>
      37  
      38  namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
      39  {
      40  _GLIBCXX_BEGIN_NAMESPACE_VERSION
      41  
      42    /// class enc_filebuf.
      43    template<typename _CharT>
      44      class enc_filebuf
      45      : public std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >
      46      {
      47      public:
      48        typedef encoding_char_traits<_CharT>     	traits_type;
      49        typedef typename traits_type::state_type	state_type;
      50        typedef typename traits_type::pos_type	pos_type;
      51  
      52        enc_filebuf(state_type& __state)
      53        : std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >()
      54        { this->_M_state_beg = __state; }
      55  
      56      private:
      57        // concept requirements:
      58        // Set state type to something useful.
      59        // Something more than copyconstructible is needed here, so
      60        // require default and copy constructible + assignment operator.
      61        __glibcxx_class_requires(state_type, _SGIAssignableConcept)
      62      };
      63  
      64  _GLIBCXX_END_NAMESPACE_VERSION
      65  } // namespace
      66  
      67  #endif