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The C and C++ Include Header Files

/usr/include/c++/13/ext/enc_filebuf.h

$ cat -n /usr/include/c++/13/ext/enc_filebuf.h

     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
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