ceph/src/boost/libs/iostreams/include/boost/iostreams/detail/translate_int_type.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 #ifndef BOOST_IOSTREAMS_DETAIL_TRANSLATE_INT_TYPE_HPP_INCLUDED
   9 #define BOOST_IOSTREAMS_DETAIL_TRANSLATE_INT_TYPE_HPP_INCLUDED
  10
  11 #if defined(_MSC_VER)
  12 # pragma once
  13 #endif
  14
  15 #include <boost/type_traits/is_same.hpp>
  16
  17 namespace boost { namespace iostreams { namespace detail {
  18
  19 template<bool IsSame>
  20 struct translate_int_type_impl;
  21
  22 //
  23 // Template name: translate_char.
  24 // Description: Translates a character or an end-of-file indicator from the
  25 //      int_type of one character traits type to the int_type of another.
  26 //
  27 template<typename SourceTr, typename TargetTr>
  28 typename TargetTr::int_type
  29 translate_int_type(typename SourceTr::int_type c)
  30 {
  31     typedef translate_int_type_impl<is_same<SourceTr, TargetTr>::value> impl;
  32     return impl::template inner<SourceTr, TargetTr>::translate(c);
  33 }
  34
  35 //----------------------------------------------------------------------------//
  36
  37 template<>
  38 struct translate_int_type_impl<true> {
  39     template<typename SourceTr, typename TargetTr>
  40     struct inner {
  41         static typename TargetTr::int_type
  42         translate(typename SourceTr::int_type c) { return c; }
  43     };
  44 };
  45
  46 template<>
  47 struct translate_int_type_impl<false> {
  48     template<typename SourceTr, typename TargetTr>
  49     struct inner {
  50         static typename TargetTr::int_type
  51         translate(typename SourceTr::int_type c)
  52             {
  53                 return SourceTr::eq_int_type(SourceTr::eof()) ?
  54                            TargetTr::eof() :
  55                            TargetTr::to_int_type(SourceTr::to_char_type(c));
  56             }
  57     };
  58 };
  59
  60 } } } // End namespaces detail, iostreams, boost.
  61
  62 #endif // #ifndef BOOST_IOSTREAMS_DETAIL_TRANSLATE_INT_TYPE_HPP_INCLUDED