| 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 |
| 49 |