ceph/src/boost/libs/fusion/include/boost/fusion/view/transform_view/detail/next_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_NEXT_IMPL_07162005_1029)
   8 #define FUSION_NEXT_IMPL_07162005_1029
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/fusion/iterator/next.hpp>
  12
  13 namespace boost { namespace fusion
  14 {
  15     struct transform_view_iterator_tag;
  16     struct transform_view_iterator2_tag;
  17
  18     template<typename First, typename F>
  19     struct transform_view_iterator;
  20
  21     template <typename First1, typename First2, typename F>
  22     struct transform_view_iterator2;
  23
  24     namespace extension
  25     {
  26         template <typename Tag>
  27         struct next_impl;
  28
  29         // Unary Version
  30         template <>
  31         struct next_impl<transform_view_iterator_tag>
  32         {
  33             template <typename Iterator>
  34             struct apply
  35             {
  36                 typedef typename Iterator::first_type first_type;
  37                 typedef typename result_of::next<first_type>::type next_type;
  38                 typedef typename Iterator::transform_type transform_type;
  39                 typedef transform_view_iterator<next_type, transform_type> type;
  40
  41                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  42                 static type
  43                 call(Iterator const& i)
  44                 {
  45                     return type(fusion::next(i.first), i.f);
  46                 }
  47             };
  48         };
  49
  50         // Binary Version
  51         template <>
  52         struct next_impl<transform_view_iterator2_tag>
  53         {
  54             template <typename Iterator>
  55             struct apply
  56             {
  57                 typedef typename Iterator::first1_type first1_type;
  58                 typedef typename Iterator::first2_type first2_type;
  59                 typedef typename result_of::next<first1_type>::type next1_type;
  60                 typedef typename result_of::next<first2_type>::type next2_type;
  61                 typedef typename Iterator::transform_type transform_type;
  62                 typedef transform_view_iterator2<next1_type, next2_type, transform_type> type;
  63
  64                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  65                 static type
  66                 call(Iterator const& i)
  67                 {
  68                     return type(fusion::next(i.first1), fusion::next(i.first2), i.f);
  69                 }
  70             };
  71         };
  72     }
  73 }}
  74
  75 #endif
  76
  77