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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 |