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

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// __enc_traits layer for filebuf -*- C++ -*-
// Copyright (C) 2002 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 2, 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.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
#include <fstream>
#include <locale>
namespace __gnu_cxx
{
// Custom traits type with __enc_traits for state type, all other bits
// equivalent to the required char_traits instantiations.
template<typename _CharT>
struct enc_char_traits: public std::char_traits<_CharT>
{
typedef std::__enc_traits state_type;
};
template<typename _CharT>
class enc_filebuf
: public std::basic_filebuf<_CharT, enc_char_traits<_CharT> >
{
public:
typedef typename enc_char_traits<_CharT>::state_type state_type;
enc_filebuf(state_type& __state)
: std::basic_filebuf<_CharT, enc_char_traits<_CharT> >()
{
// Set state type to something useful.
// Something more than copyconstructible is needed here, so
// require copyconstructible + assignment operator.
__glibcpp_class_requires(state_type, _SGIAssignableConcept);
_M_state_cur = __state;
_M_state_cur._M_init();
};
};
} // namespace __gnu_cxx