libstdc++-v3/include/ext/enc_filebuf.h

   1 // filebuf with encoding state type -*- C++ -*-
   2
   3 // Copyright (C) 2002, 2003, 2004, 2007 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 2, 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 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 /** @file ext/enc_filebuf.h
  31  *  This file is a GNU extension to the Standard C++ Library.
  32  */
  33
  34 #ifndef _EXT_ENC_FILEBUF_H
  35 #define _EXT_ENC_FILEBUF_H 1
  36
  37 #include <fstream>
  38 #include <locale>
  39 #include <ext/codecvt_specializations.h>
  40
  41 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
  42
  43   /// class enc_filebuf.
  44   template<typename _CharT>
  45     class enc_filebuf
  46     : public std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >
  47     {
  48     public:
  49       typedef encoding_char_traits<_CharT>      traits_type;
  50       typedef typename traits_type::state_type  state_type;
  51       typedef typename traits_type::pos_type    pos_type;
  52
  53       enc_filebuf(state_type& __state)
  54       : std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >()
  55       { this->_M_state_beg = __state; }
  56
  57     private:
  58       // concept requirements:
  59       // Set state type to something useful.
  60       // Something more than copyconstructible is needed here, so
  61       // require default and copy constructible + assignment operator.
  62       __glibcxx_class_requires(state_type, _SGIAssignableConcept)
  63     };
  64
  65 _GLIBCXX_END_NAMESPACE
  66
  67 #endif