enc_filebuf.h

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00001 // filebuf with encoding state type -*- C++ -*-
00002 
00003 // Copyright (C) 2002, 2003, 2004, 2007, 2009 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 3, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 /** @file ext/enc_filebuf.h
00026  *  This file is a GNU extension to the Standard C++ Library.
00027  */
00028 
00029 #ifndef _EXT_ENC_FILEBUF_H
00030 #define _EXT_ENC_FILEBUF_H 1
00031 
00032 #include <fstream>
00033 #include <locale>
00034 #include <ext/codecvt_specializations.h>
00035 
00036 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
00037 
00038   /// class enc_filebuf.
00039   template<typename _CharT>
00040     class enc_filebuf
00041     : public std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >
00042     {
00043     public:
00044       typedef encoding_char_traits<_CharT>      traits_type;
00045       typedef typename traits_type::state_type  state_type;
00046       typedef typename traits_type::pos_type    pos_type;
00047 
00048       enc_filebuf(state_type& __state)
00049       : std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >()
00050       { this->_M_state_beg = __state; }
00051 
00052     private:
00053       // concept requirements:
00054       // Set state type to something useful.
00055       // Something more than copyconstructible is needed here, so
00056       // require default and copy constructible + assignment operator.
00057       __glibcxx_class_requires(state_type, _SGIAssignableConcept)
00058     };
00059 
00060 _GLIBCXX_END_NAMESPACE
00061 
00062 #endif

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