ceph/src/boost/boost/fusion/iterator/key_of.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_ITERATOR_KEY_OF_HPP
   9 #define BOOST_FUSION_ITERATOR_KEY_OF_HPP
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/fusion/support/tag_of.hpp>
  13
  14 namespace boost { namespace fusion
  15 {
  16     struct iterator_facade_tag;
  17
  18     namespace extension
  19     {
  20         template <typename>
  21         struct key_of_impl;
  22
  23         template <>
  24         struct key_of_impl<iterator_facade_tag>
  25         {
  26             template <typename It>
  27             struct apply
  28               : It::template key_of<It>
  29             {};
  30         };
  31     }
  32
  33     namespace result_of
  34     {
  35         template <typename It>
  36         struct key_of
  37           : extension::key_of_impl<typename traits::tag_of<It>::type>::
  38                 template apply<It>
  39         {};
  40     }
  41 }}
  42
  43 #endif