enc_filebuf.h

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00001 // filebuf with encoding state type -*- C++ -*-
00002 
00003 // Copyright (C) 2002, 2003, 2004, 2007 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 2, 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 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 /** @file ext/enc_filebuf.h
00031  *  This file is a GNU extension to the Standard C++ Library.
00032  */
00033 
00034 #ifndef _EXT_ENC_FILEBUF_H
00035 #define _EXT_ENC_FILEBUF_H 1
00036 
00037 #include <fstream>
00038 #include <locale>
00039 #include <ext/codecvt_specializations.h>
00040 
00041 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
00042 
00043   /// class enc_filebuf.
00044   template<typename _CharT>
00045     class enc_filebuf
00046     : public std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >
00047     {
00048     public:
00049       typedef encoding_char_traits<_CharT>      traits_type;
00050       typedef typename traits_type::state_type  state_type;
00051       typedef typename traits_type::pos_type    pos_type;
00052 
00053       enc_filebuf(state_type& __state)
00054       : std::basic_filebuf<_CharT, encoding_char_traits<_CharT> >()
00055       { this->_M_state_beg = __state; }
00056 
00057     private:
00058       // concept requirements:
00059       // Set state type to something useful.
00060       // Something more than copyconstructible is needed here, so
00061       // require default and copy constructible + assignment operator.
00062       __glibcxx_class_requires(state_type, _SGIAssignableConcept)
00063     };
00064 
00065 _GLIBCXX_END_NAMESPACE
00066 
00067 #endif

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