ceph/src/boost/libs/fusion/include/boost/fusion/view/nview/detail/distance_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2009 Hartmut Kaiser
   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 #if !defined(BOOST_FUSION_NVIEW_DISTANCE_IMPL_SEP_23_2009_0328PM)
   9 #define BOOST_FUSION_NVIEW_DISTANCE_IMPL_SEP_23_2009_0328PM
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/fusion/iterator/distance.hpp>
  13
  14 namespace boost { namespace fusion
  15 {
  16     struct nview_iterator_tag;
  17
  18     namespace extension
  19     {
  20         template<typename Tag>
  21         struct distance_impl;
  22
  23         template<>
  24         struct distance_impl<nview_iterator_tag>
  25         {
  26             template<typename First, typename Last>
  27             struct apply
  28               : result_of::distance<typename First::first_type, typename Last::first_type>
  29             {
  30                 typedef typename result_of::distance<
  31                     typename First::first_type, typename Last::first_type
  32                 >::type type;
  33
  34                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  35                 static type
  36                 call(First const& /*first*/, Last const& /*last*/)
  37                 {
  38                     return type();
  39                 }
  40             };
  41         };
  42     }
  43
  44 }}
  45
  46 #endif