ceph/src/boost/boost/fusion/container/map/detail/cpp03/deref_data_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2009 Christopher Schmidt
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7
   8 #ifndef BOOST_FUSION_CONTAINER_MAP_DETAIL_DEREF_DATA_IMPL_HPP
   9 #define BOOST_FUSION_CONTAINER_MAP_DETAIL_DEREF_DATA_IMPL_HPP
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/fusion/iterator/value_of.hpp>
  13 #include <boost/fusion/iterator/deref.hpp>
  14 #include <boost/fusion/support/detail/access.hpp>
  15 #include <boost/type_traits/is_const.hpp>
  16 #include <boost/mpl/if.hpp>
  17
  18 namespace boost { namespace fusion { namespace extension
  19 {
  20     template <typename>
  21     struct deref_data_impl;
  22
  23     template <>
  24     struct deref_data_impl<map_iterator_tag>
  25     {
  26         template <typename It>
  27         struct apply
  28         {
  29             typedef typename result_of::value_of<It>::type::second_type data;
  30
  31             typedef typename
  32                 mpl::if_<
  33                     is_const<typename It::seq_type>
  34                   , typename detail::cref_result<data>::type
  35                   , typename detail::ref_result<data>::type
  36                 >::type
  37             type;
  38
  39             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  40             static type
  41             call(It const& it)
  42             {
  43                 return fusion::deref(it).second;
  44             }
  45         };
  46     };
  47 }}}
  48
  49 #endif