ceph/src/boost/libs/iostreams/include/boost/iostreams/detail/codecvt_holder.hpp

   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;
  33     const codecvt_type& get() const { return codecvt_; }
  34     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;
  41     codecvt_holder() { reset_codecvt(); }
  42     const codecvt_type& get() const { return *codecvt_; }
  43     void imbue(const std::locale& loc)
  44     {
  45         loc_ = loc;
  46         reset_codecvt();
  47     }
  48     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