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

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3     Copyright (c) 2005-2006 Dan Marsden
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 ==============================================================================*/
   8 #if !defined(FUSION_DISTANCE_IMPL_13122005_2139)
   9 #define FUSION_DISTANCE_IMPL_13122005_2139
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/fusion/iterator/distance.hpp>
  13
  14 namespace boost { namespace fusion {
  15
  16     struct transform_view_iterator_tag;
  17     struct transform_view_iterator2_tag;
  18
  19     namespace extension
  20     {
  21         template<typename Tag>
  22         struct distance_impl;
  23
  24         // Unary Version
  25         template<>
  26         struct distance_impl<transform_view_iterator_tag>
  27         {
  28             template<typename First, typename Last>
  29             struct apply
  30                 : result_of::distance<typename First::first_type, typename Last::first_type>
  31             {
  32                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  33                 static
  34                 typename result_of::distance<typename First::first_type, typename Last::first_type>::type
  35                 call(First const& first, Last const& last)
  36                 {
  37                     return boost::fusion::distance(first.first, last.first);
  38                 }
  39             };
  40         };
  41
  42         // Binary Version
  43         template<>
  44         struct distance_impl<transform_view_iterator2_tag>
  45         {
  46             template<typename First, typename Last>
  47             struct apply
  48                 : result_of::distance<typename First::first1_type, typename Last::first1_type>
  49             {
  50                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  51                 static
  52                 typename result_of::distance<typename First::first1_type, typename Last::first1_type>::type
  53                 call(First const& first, Last const& last)
  54                 {
  55                     return boost::fusion::distance(first.first1, last.first1);
  56                 }
  57             };
  58         };
  59     }
  60 }}
  61
  62 #endif