boost_fusion 0.1.0

Boost C++ library boost_fusion packaged using Zanbil
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73

/*=============================================================================
    Copyright (c) 2001-2011 Joel de Guzman

    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/
#ifndef FUSION_IS_SEQUENCE_05052005_1002
#define FUSION_IS_SEQUENCE_05052005_1002

#include <boost/fusion/support/config.hpp>
#include <boost/fusion/support/sequence_base.hpp>
#include <boost/fusion/support/tag_of.hpp>
#include <boost/fusion/support/detail/is_native_fusion_sequence.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/is_sequence.hpp>
#include <boost/type_traits/is_convertible.hpp>

namespace boost { namespace fusion
{
    // Special tags:
    struct non_fusion_tag;
    struct boost_tuple_tag; // boost::tuples::tuple tag
    struct boost_array_tag; // boost::array tag
    struct mpl_sequence_tag; // mpl sequence tag
    struct std_pair_tag; // std::pair tag

    namespace extension
    {
        template <typename T>
        struct is_sequence_impl
        {
            template <typename Sequence>
            struct apply
              : is_convertible<Sequence, fusion::detail::from_sequence_convertible_type>
            {};
        };

        template <>
        struct is_sequence_impl<non_fusion_tag>
        {
            template <typename T>
            struct apply : mpl::false_ {};
        };

        template <>
        struct is_sequence_impl<boost_tuple_tag>;

        template <>
        struct is_sequence_impl<boost_array_tag>;

        template <>
        struct is_sequence_impl<mpl_sequence_tag>;

        template <>
        struct is_sequence_impl<std_pair_tag>;
    }

    namespace traits
    {
        template <typename T>
        struct is_sequence
          : mpl::bool_<
                (bool)extension::is_sequence_impl<
                    typename fusion::detail::tag_of<T>::type
                >::template apply<T>::type::value
            >
        {};

        using detail::is_native_fusion_sequence;
    }
}}

#endif