1 // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) 2 // (C) Copyright 2003-2007 Jonathan Turkanis 3 // Distributed under the Boost Software License, Version 1.0. (See accompanying 4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) 5 6 // See http://www.boost.org/libs/iostreams for documentation. 7 8 // Contains machinery for performing code conversion. 9 10 #ifndef BOOST_IOSTREAMS_DETAIL_CODECVT_HOLDER_HPP_INCLUDED 11 #define BOOST_IOSTREAMS_DETAIL_CODECVT_HOLDER_HPP_INCLUDED 12 13 #if defined(_MSC_VER) 14 # pragma once 15 #endif 16 17 #include <cwchar> // mbstate_t. 18 #include <locale> // codecvt, locale. 19 #include <boost/config.hpp> // HAS_MACRO_USE_FACET. 20 #include <boost/iostreams/detail/config/codecvt.hpp> 21 22 namespace boost { namespace iostreams { namespace detail { 23 24 struct default_codecvt { 25 typedef wchar_t intern_type, from_type; 26 typedef char extern_type, to_type; 27 typedef std::mbstate_t state_type; 28 }; 29 30 template<typename Codecvt> 31 struct codecvt_holder { 32 typedef Codecvt codecvt_type; getboost::iostreams::detail::codecvt_holder33 const codecvt_type& get() const { return codecvt_; } imbueboost::iostreams::detail::codecvt_holder34 void imbue(const std::locale&) { } 35 Codecvt codecvt_; 36 }; 37 38 template<> 39 struct codecvt_holder<default_codecvt> { 40 typedef std::codecvt<wchar_t, char, std::mbstate_t> codecvt_type; codecvt_holderboost::iostreams::detail::codecvt_holder41 codecvt_holder() { reset_codecvt(); } getboost::iostreams::detail::codecvt_holder42 const codecvt_type& get() const { return *codecvt_; } imbueboost::iostreams::detail::codecvt_holder43 void imbue(const std::locale& loc) 44 { 45 loc_ = loc; 46 reset_codecvt(); 47 } reset_codecvtboost::iostreams::detail::codecvt_holder48 void reset_codecvt() 49 { 50 using namespace std; 51 #ifndef BOOST_HAS_MACRO_USE_FACET 52 codecvt_ = & use_facet< codecvt_type >(loc_); 53 #else 54 codecvt_ = & _USE(loc_, codecvt_type); 55 #endif 56 } 57 std::locale loc_; // Prevent codecvt_ from being freed. 58 const codecvt_type* codecvt_; 59 }; 60 61 } } } // End namespaces detail, iostreams, boost. 62 63 #endif // #ifndef BOOST_IOSTREAMS_DETAIL_CODECVT_HOLDER_HPP_INCLUDED 64