single_view/detail/advance_impl.hpp

0001 /*=============================================================================
0002     Copyright (c) 2011 Eric Niebler
0003
0004     Distributed under the Boost Software License, Version 1.0. (See accompanying
0005     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 ==============================================================================*/
0007
0008 #if !defined(BOOST_FUSION_SINGLE_VIEW_ADVANCE_IMPL_JUL_07_2011_1348PM)
0009 #define BOOST_FUSION_SINGLE_VIEW_ADVANCE_IMPL_JUL_07_2011_1348PM
0010
0011 #include <boost/fusion/support/config.hpp>
0012 #include <boost/mpl/plus.hpp>
0013
0014 namespace boost { namespace fusion
0015 {
0016     struct single_view_iterator_tag;
0017
0018     template <typename SingleView, typename Pos>
0019     struct single_view_iterator;
0020
0021     namespace extension
0022     {
0023         template<typename Tag>
0024         struct advance_impl;
0025
0026         template<>
0027         struct advance_impl<single_view_iterator_tag>
0028         {
0029             template<typename Iterator, typename Dist>
0030             struct apply
0031             {
0032                 typedef single_view_iterator<
0033                     typename Iterator::single_view_type,
0034                     typename mpl::plus<typename Iterator::position, Dist>::type>
0035                 type;
0036
0037                 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0038                 static type
0039                 call(Iterator const& i)
0040                 {
0041                     return type(i.view);
0042                 }
0043             };
0044         };
0045     }
0046
0047 }}
0048
0049 #endif