Chris@16: // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
Chris@16: // (C) Copyright 2003-2007 Jonathan Turkanis
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
Chris@16: 
Chris@16: // See http://www.boost.org/libs/iostreams for documentation.
Chris@16: 
Chris@16: // Contains machinery for performing code conversion.
Chris@16: 
Chris@16: #ifndef BOOST_IOSTREAMS_DETAIL_CODECVT_HOLDER_HPP_INCLUDED
Chris@16: #define BOOST_IOSTREAMS_DETAIL_CODECVT_HOLDER_HPP_INCLUDED
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
Chris@16: # pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <cwchar>            // mbstate_t.
Chris@16: #include <locale>            // codecvt, locale.
Chris@16: #include <boost/config.hpp>  // HAS_MACRO_USE_FACET.
Chris@16: #include <boost/iostreams/detail/config/codecvt.hpp>
Chris@16: 
Chris@16: namespace boost { namespace iostreams { namespace detail {
Chris@16: 
Chris@16: struct default_codecvt { 
Chris@16:     typedef wchar_t         intern_type, from_type;
Chris@16:     typedef char            extern_type, to_type;
Chris@16:     typedef std::mbstate_t  state_type;
Chris@16: };
Chris@16: 
Chris@16: template<typename Codecvt>
Chris@16: struct codecvt_holder {
Chris@16:     typedef Codecvt codecvt_type;
Chris@16:     const codecvt_type& get() const { return codecvt_; }
Chris@16:     void imbue(const std::locale&) { }
Chris@16:     Codecvt codecvt_;
Chris@16: };
Chris@16: 
Chris@16: template<>
Chris@16: struct codecvt_holder<default_codecvt> {
Chris@16:     typedef std::codecvt<wchar_t, char, std::mbstate_t> codecvt_type;
Chris@16:     codecvt_holder() { reset_codecvt(); }
Chris@16:     const codecvt_type& get() const { return *codecvt_; }
Chris@16:     void imbue(const std::locale& loc) 
Chris@16:     { 
Chris@16:         loc_ = loc;
Chris@16:         reset_codecvt();
Chris@16:     }
Chris@16:     void reset_codecvt()
Chris@16:     {
Chris@16:         using namespace std;
Chris@16:         #ifndef BOOST_HAS_MACRO_USE_FACET
Chris@16:             codecvt_ = & use_facet< codecvt_type >(loc_);
Chris@16:         #else
Chris@16:             codecvt_ = & _USE(loc_, codecvt_type);
Chris@16:         #endif
Chris@16:     }
Chris@16:     std::locale loc_; // Prevent codecvt_ from being freed.
Chris@16:     const codecvt_type* codecvt_;
Chris@16: };
Chris@16: 
Chris@16: } } } // End namespaces detail, iostreams, boost.
Chris@16: 
Chris@16: #endif // #ifndef BOOST_IOSTREAMS_DETAIL_CODECVT_HOLDER_HPP_INCLUDED