3rdparty/boost/boost/fusion/view/single_view/detail/next_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3     Copyright (c) 2011 Eric Niebler
   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(BOOST_FUSION_SINGLE_VIEW_NEXT_IMPL_05052005_0331)
   9 #define BOOST_FUSION_SINGLE_VIEW_NEXT_IMPL_05052005_0331
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/mpl/next.hpp>
  13 #include <boost/static_assert.hpp>
  14
  15 namespace boost { namespace fusion
  16 {
  17     struct single_view_iterator_tag;
  18
  19     template <typename SingleView, typename Pos>
  20     struct single_view_iterator;
  21
  22     namespace extension
  23     {
  24         template <typename Tag>
  25         struct next_impl;
  26
  27         template <>
  28         struct next_impl<single_view_iterator_tag>
  29         {
  30             template <typename Iterator>
  31             struct apply
  32             {
  33                 typedef single_view_iterator<
  34                     typename Iterator::single_view_type,
  35                     typename mpl::next<typename Iterator::position>::type>
  36                 type;
  37
  38                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  39                 static type
  40                 call(Iterator const& i)
  41                 {
  42                     // Workaround for ICE on GCC 4.0.0.
  43                     // see https://svn.boost.org/trac/boost/ticket/5808
  44                     typedef typename type::position position;
  45                     BOOST_STATIC_ASSERT((position::value < 2));
  46                     return type(i.view);
  47                 }
  48             };
  49         };
  50     }
  51 }}
  52
  53 #endif
  54
  55