/Src/Dependencies/Boost/boost/fusion/sequence/intrinsic/size.hpp

 1/*=============================================================================
 2    Copyright (c) 2001-2006 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/mpl/int.hpp>
11#include <boost/fusion/support/tag_of.hpp>
12
13namespace boost { namespace fusion
14{
15    // Special tags:
16    struct sequence_facade_tag;
17    struct boost_tuple_tag; // boost::tuples::tuple tag
18    struct boost_array_tag; // boost::array tag
19    struct mpl_sequence_tag; // mpl sequence tag
20    struct std_pair_tag; // std::pair tag
21
22    namespace extension
23    {
24        template <typename Tag>
25        struct size_impl
26        {
27            template <typename Sequence>
28            struct apply : Sequence::size {};
29        };
30
31        template <>
32        struct size_impl<sequence_facade_tag>
33        {
34            template <typename Sequence>
35            struct apply : Sequence::template size<Sequence> {};
36        };
37 
38        template <>
39        struct size_impl<boost_tuple_tag>;
40 
41        template <>
42        struct size_impl<boost_array_tag>;
43
44        template <>
45        struct size_impl<mpl_sequence_tag>;
46
47        template <>
48        struct size_impl<std_pair_tag>;
49    }
50
51    namespace result_of
52    {
53        template <typename Sequence>
54        struct size
55            : extension::size_impl<typename detail::tag_of<Sequence>::type>::
56        template apply<Sequence>
57
58        {
59            typedef typename extension::size_impl<typename detail::tag_of<Sequence>::type>::
60            template apply<Sequence>::type size_application;
61            BOOST_STATIC_CONSTANT(int, value = size_application::value);
62        };
63    }
64
65    template <typename Sequence>
66    inline typename result_of::size<Sequence>::type
67    size(Sequence const&)
68    {
69        typedef typename result_of::size<Sequence>::type result;
70        return result();
71    }
72}}
73
74#endif