ceph/src/boost/libs/fusion/include/boost/fusion/view/reverse_view/detail/value_of_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   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 #if !defined(FUSION_VALUE_OF_IMPL_07202005_0900)
   8 #define FUSION_VALUE_OF_IMPL_07202005_0900
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/fusion/iterator/value_of.hpp>
  12 #include <boost/fusion/iterator/prior.hpp>
  13
  14 namespace boost { namespace fusion
  15 {
  16     struct reverse_view_iterator_tag;
  17
  18     namespace extension
  19     {
  20         template <typename Tag>
  21         struct value_of_impl;
  22
  23         template <>
  24         struct value_of_impl<reverse_view_iterator_tag>
  25         {
  26             template <typename Iterator>
  27             struct apply
  28             {
  29                 typedef typename
  30                     result_of::value_of<
  31                         typename result_of::prior<
  32                             typename Iterator::first_type
  33                         >::type
  34                     >::type
  35                 type;
  36             };
  37         };
  38     }
  39 }}
  40
  41 #endif
  42
  43