boost/fusion/view/reverse_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_07202005_0856)
   8 #define FUSION_NEXT_IMPL_07202005_0856
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/fusion/iterator/next.hpp>
  12 #include <boost/fusion/iterator/prior.hpp>
  13
  14 namespace boost { namespace fusion
  15 {
  16     struct reverse_view_iterator_tag;
  17
  18     template <typename Iterator>
  19     struct reverse_view_iterator;
  20
  21     namespace extension
  22     {
  23         template <>
  24         struct next_impl<reverse_view_iterator_tag>
  25         {
  26             template <typename Iterator>
  27             struct apply
  28             {
  29                 typedef typename Iterator::first_type first_type;
  30                 typedef typename prior_impl<typename first_type::fusion_tag>::
  31                     template apply<first_type>
  32                 wrapped;
  33
  34                 typedef reverse_view_iterator<typename wrapped::type> type;
  35
  36                 BOOST_FUSION_GPU_ENABLED
  37                 static type
  38                 call(Iterator const& i)
  39                 {
  40                     return type(wrapped::call(i.first));
  41                 }
  42             };
  43         };
  44     }
  45 }}
  46
  47 #endif
  48
  49