The C and C++ Include Header Files

/usr/include/c++/11/ext/enc_filebuf.h


$ cat -n /usr/include/c++/11/ext/enc_filebuf.h

     1	// filebuf with encoding state type -*- C++ -*-
     2	
     3	// Copyright (C) 2002-2021 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 <fstream>
    33	#include <locale>
    34	#include <ext/codecvt_specializations.h>
    35	
    36	namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
    37	{
    38	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    39	
    40	  /// class enc_filebuf.
    41	  template<typename _CharT>
    42	    class enc_filebuf
    43	    : public std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >
    44	    {
    45	    public:
    46	      typedef encoding_char_traits<_CharT>     	traits_type;
    47	      typedef typename traits_type::state_type	state_type;
    48	      typedef typename traits_type::pos_type	pos_type;
    49	
    50	      enc_filebuf(state_type& __state)
    51	      : std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >()
    52	      { this->_M_state_beg = __state; }
    53	
    54	    private:
    55	      // concept requirements:
    56	      // Set state type to something useful.
    57	      // Something more than copyconstructible is needed here, so
    58	      // require default and copy constructible + assignment operator.
    59	      __glibcxx_class_requires(state_type, _SGIAssignableConcept)
    60	    };
    61	
    62	_GLIBCXX_END_NAMESPACE_VERSION
    63	} // namespace
    64	
    65	#endif