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_SIZE_05052005_0214) |
8 | #define FUSION_SIZE_05052005_0214 |
9 | |
10 | #include <boost/fusion/support/config.hpp> |
11 | #include <boost/utility/enable_if.hpp> |
12 | #include <boost/mpl/if.hpp> |
13 | #include <boost/mpl/int.hpp> |
14 | #include <boost/fusion/sequence/intrinsic_fwd.hpp> |
15 | #include <boost/fusion/support/tag_of.hpp> |
16 | #include <boost/fusion/support/is_segmented.hpp> |
17 | #include <boost/fusion/sequence/intrinsic/detail/segmented_size.hpp> |
18 | |
19 | namespace boost { namespace fusion |
20 | { |
21 | // Special tags: |
22 | struct sequence_facade_tag; |
23 | struct boost_tuple_tag; // boost::tuples::tuple tag |
24 | struct boost_array_tag; // boost::array tag |
25 | struct mpl_sequence_tag; // mpl sequence tag |
26 | struct std_pair_tag; // std::pair tag |
27 | |
28 | namespace extension |
29 | { |
30 | template <typename Tag> |
31 | struct size_impl |
32 | { |
33 | template<typename Sequence> |
34 | struct unsegmented_size : Sequence::size {}; |
35 | |
36 | template <typename Sequence> |
37 | struct apply |
38 | : mpl::if_< |
39 | traits::is_segmented<Sequence> |
40 | , detail::segmented_size<Sequence> |
41 | , unsegmented_size<Sequence> |
42 | >::type |
43 | {}; |
44 | }; |
45 | |
46 | template <> |
47 | struct size_impl<sequence_facade_tag> |
48 | { |
49 | template <typename Sequence> |
50 | struct apply : Sequence::template size<Sequence> {}; |
51 | }; |
52 | |
53 | template <> |
54 | struct size_impl<boost_tuple_tag>; |
55 | |
56 | template <> |
57 | struct size_impl<boost_array_tag>; |
58 | |
59 | template <> |
60 | struct size_impl<mpl_sequence_tag>; |
61 | |
62 | template <> |
63 | struct size_impl<std_pair_tag>; |
64 | } |
65 | |
66 | namespace result_of |
67 | { |
68 | template <typename Sequence> |
69 | struct size |
70 | : mpl::int_< |
71 | extension::size_impl<typename detail::tag_of<Sequence>::type> |
72 | ::template apply<Sequence>::type::value |
73 | > {}; |
74 | } |
75 | |
76 | template <typename Sequence> |
77 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
78 | inline typename result_of::size<Sequence>::type |
79 | size(Sequence const&) |
80 | { |
81 | typedef typename result_of::size<Sequence>::type result; |
82 | return result(); |
83 | } |
84 | }} |
85 | |
86 | #endif |
87 |