ceph/src/boost/libs/fusion/include/boost/fusion/view/single_view/detail/prior_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2011 Eric Niebler
   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(BOOST_FUSION_SINGLE_VIEW_PRIOR_IMPL_JUL_07_2011_1348PM)
   8 #define BOOST_FUSION_SINGLE_VIEW_PRIOR_IMPL_JUL_07_2011_1348PM
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/mpl/prior.hpp>
  12
  13 namespace boost { namespace fusion
  14 {
  15     struct single_view_iterator_tag;
  16
  17     template <typename Sequence, typename Pos>
  18     struct single_view_iterator;
  19
  20     namespace extension
  21     {
  22         template <typename Tag>
  23         struct prior_impl;
  24
  25         template <>
  26         struct prior_impl<single_view_iterator_tag>
  27         {
  28             template <typename Iterator>
  29             struct apply
  30             {
  31                 typedef single_view_iterator<
  32                     typename Iterator::single_view_type,
  33                     typename mpl::prior<typename Iterator::position>::type>
  34                 type;
  35
  36                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  37                 static type
  38                 call(Iterator const& i)
  39                 {
  40                     return type(i.view);
  41                 }
  42             };
  43         };
  44     }
  45
  46 }}
  47
  48 #endif