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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_05042005_1144) | |
8 | #define FUSION_PRIOR_05042005_1144 | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/fusion/support/tag_of.hpp> | |
12 | ||
13 | namespace boost { namespace fusion | |
14 | { | |
15 | // Special tags: | |
16 | struct iterator_facade_tag; // iterator facade tag | |
17 | struct boost_array_iterator_tag; // boost::array iterator tag | |
18 | struct mpl_iterator_tag; // mpl sequence iterator tag | |
19 | struct std_pair_iterator_tag; // std::pair iterator tag | |
20 | ||
21 | namespace extension | |
22 | { | |
23 | template <typename Tag> | |
24 | struct prior_impl | |
25 | { | |
26 | template <typename Iterator> | |
27 | struct apply {}; | |
28 | }; | |
29 | ||
30 | template <> | |
31 | struct prior_impl<iterator_facade_tag> | |
32 | { | |
33 | template <typename Iterator> | |
34 | struct apply : Iterator::template prior<Iterator> {}; | |
35 | }; | |
36 | ||
37 | template <> | |
38 | struct prior_impl<boost_array_iterator_tag>; | |
39 | ||
40 | template <> | |
41 | struct prior_impl<mpl_iterator_tag>; | |
42 | ||
43 | template <> | |
44 | struct prior_impl<std_pair_iterator_tag>; | |
45 | } | |
46 | ||
47 | namespace result_of | |
48 | { | |
49 | template <typename Iterator> | |
50 | struct prior | |
51 | : extension::prior_impl<typename detail::tag_of<Iterator>::type>:: | |
52 | template apply<Iterator> | |
53 | {}; | |
54 | } | |
55 | ||
56 | template <typename Iterator> | |
57 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
58 | inline typename result_of::prior<Iterator>::type const | |
59 | prior(Iterator const& i) | |
60 | { | |
61 | return result_of::prior<Iterator>::call(i); | |
62 | } | |
63 | }} | |
64 | ||
65 | #endif |