ceph/src/boost/libs/fusion/include/boost/fusion/container/map/detail/cpp03/value_of_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_VALUE_OF_IMPL_HPP
   9 #define BOOST_FUSION_CONTAINER_MAP_DETAIL_VALUE_OF_IMPL_HPP
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/fusion/sequence/intrinsic/value_at.hpp>
  13 #include <boost/type_traits/is_const.hpp>
  14
  15 namespace boost { namespace fusion { namespace extension
  16 {
  17     template <typename>
  18     struct value_of_impl;
  19
  20     template <>
  21     struct value_of_impl<map_iterator_tag>
  22     {
  23         template <typename It>
  24         struct apply
  25         {
  26             typedef typename
  27                 result_of::value_at<
  28                     typename mpl::if_<
  29                         is_const<typename It::seq_type>
  30                       , typename It::seq_type::storage_type const
  31                       , typename It::seq_type::storage_type
  32                     >::type
  33                   , typename It::index
  34                 >::type
  35             type;
  36         };
  37     };
  38 }}}
  39
  40 #endif