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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
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(FUSION_PRIOR_IMPL_05042005_1145) | |
8 | #define FUSION_PRIOR_IMPL_05042005_1145 | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/fusion/container/vector/vector_iterator.hpp> | |
12 | ||
13 | namespace boost { namespace fusion | |
14 | { | |
15 | struct vector_iterator_tag; | |
16 | template <typename Vector, int N> | |
17 | struct vector_iterator; | |
18 | ||
19 | namespace extension | |
20 | { | |
21 | template <typename Tag> | |
22 | struct prior_impl; | |
23 | ||
24 | template <> | |
25 | struct prior_impl<vector_iterator_tag> | |
26 | { | |
27 | template <typename Iterator> | |
28 | struct apply | |
29 | { | |
30 | typedef typename Iterator::vector vector; | |
31 | typedef typename Iterator::index index; | |
32 | typedef vector_iterator<vector, index::value-1> type; | |
33 | ||
34 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
35 | static type | |
36 | call(Iterator const& i) | |
37 | { | |
38 | return type(i.vec); | |
39 | } | |
40 | }; | |
41 | }; | |
42 | } | |
43 | }} | |
44 | ||
45 | #endif |