ceph/src/boost/libs/fusion/include/boost/fusion/container/map/detail/cpp03/key_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_KEY_OF_IMPL_HPP
   9 #define BOOST_FUSION_CONTAINER_MAP_DETAIL_KEY_OF_IMPL_HPP
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/fusion/container/map/detail/cpp03/value_of_impl.hpp>
  13
  14 namespace boost { namespace fusion { namespace extension
  15 {
  16     template <typename>
  17     struct key_of_impl;
  18
  19     template <>
  20     struct key_of_impl<map_iterator_tag>
  21     {
  22         template <typename It>
  23         struct apply
  24         {
  25             typedef typename
  26                 value_of_impl<map_iterator_tag>::
  27                     template apply<It>::type::first_type
  28             type;
  29         };
  30     };
  31 }}}
  32
  33 #endif