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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_BEGIN_04052005_1132) | |
8 | #define FUSION_BEGIN_04052005_1132 | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/utility/enable_if.hpp> | |
12 | #include <boost/mpl/empty_base.hpp> | |
13 | #include <boost/mpl/if.hpp> | |
14 | #include <boost/fusion/sequence/intrinsic_fwd.hpp> | |
15 | #include <boost/fusion/support/tag_of.hpp> | |
16 | #include <boost/fusion/support/is_sequence.hpp> | |
17 | #include <boost/fusion/support/is_segmented.hpp> | |
18 | #include <boost/fusion/sequence/intrinsic/detail/segmented_begin.hpp> | |
19 | ||
20 | namespace boost { namespace fusion | |
21 | { | |
22 | // Special tags: | |
23 | struct sequence_facade_tag; // iterator facade tag | |
24 | struct boost_tuple_tag; // boost::tuples::tuple tag | |
25 | struct boost_array_tag; // boost::array tag | |
26 | struct mpl_sequence_tag; // mpl sequence tag | |
27 | struct std_pair_tag; // std::pair tag | |
28 | ||
29 | namespace extension | |
30 | { | |
31 | template <typename Tag> | |
32 | struct begin_impl | |
33 | { | |
34 | template <typename Sequence> | |
35 | struct apply | |
36 | : mpl::if_< | |
37 | traits::is_segmented<Sequence> | |
38 | , detail::segmented_begin<Sequence> | |
39 | , mpl::empty_base | |
40 | >::type | |
41 | {}; | |
42 | }; | |
43 | ||
44 | template <> | |
45 | struct begin_impl<sequence_facade_tag> | |
46 | { | |
47 | template <typename Sequence> | |
48 | struct apply : Sequence::template begin<Sequence> {}; | |
49 | }; | |
50 | ||
51 | template <> | |
52 | struct begin_impl<boost_tuple_tag>; | |
53 | ||
54 | template <> | |
55 | struct begin_impl<boost_array_tag>; | |
56 | ||
57 | template <> | |
58 | struct begin_impl<mpl_sequence_tag>; | |
59 | ||
60 | template <> | |
61 | struct begin_impl<std_pair_tag>; | |
62 | } | |
63 | ||
64 | namespace result_of | |
65 | { | |
66 | template <typename Sequence> | |
67 | struct begin | |
68 | : extension::begin_impl<typename detail::tag_of<Sequence>::type>:: | |
69 | template apply<Sequence> | |
70 | {}; | |
71 | } | |
72 | ||
73 | template <typename Sequence> | |
74 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
75 | inline typename | |
76 | lazy_enable_if< | |
77 | traits::is_sequence<Sequence> | |
78 | , result_of::begin<Sequence> | |
79 | >::type const | |
80 | begin(Sequence& seq) | |
81 | { | |
82 | return result_of::begin<Sequence>::call(seq); | |
83 | } | |
84 | ||
85 | template <typename Sequence> | |
86 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
87 | inline typename | |
88 | lazy_enable_if< | |
89 | traits::is_sequence<Sequence> | |
90 | , result_of::begin<Sequence const> | |
91 | >::type const | |
92 | begin(Sequence const& seq) | |
93 | { | |
94 | return result_of::begin<Sequence const>::call(seq); | |
95 | } | |
96 | }} | |
97 | ||
98 | #endif |