enc_filebuf.h

00001 // __enc_traits layer for filebuf -*- C++ -*-
00002 
00003 // Copyright (C) 2002 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 #include <fstream>
00031 #include <locale>
00032 
00033 namespace __gnu_cxx
00034 {
00035   // Custom traits type with __enc_traits for state type, all other bits
00036   // equivalent to the required char_traits instantiations.
00037   template<typename _CharT>
00038     struct enc_char_traits: public std::char_traits<_CharT>
00039     {
00040       typedef std::__enc_traits state_type;
00041     };
00042 
00043   template<typename _CharT>
00044     class enc_filebuf
00045     : public std::basic_filebuf<_CharT, enc_char_traits<_CharT> >
00046     {
00047     public:
00048       typedef typename enc_char_traits<_CharT>::state_type state_type;
00049       
00050       enc_filebuf(state_type& __state)
00051       : std::basic_filebuf<_CharT, enc_char_traits<_CharT> >()
00052       {
00053     this->_M_state_beg = __state;
00054     this->_M_state_beg._M_init();
00055       }
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 } // namespace __gnu_cxx

Generated on Thu Feb 10 23:22:54 2005 for libstdc++-v3 Source by  doxygen 1.4.0