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_IS_SEQUENCE_05052005_1002)
8#define FUSION_IS_SEQUENCE_05052005_1002
9
10#include <boost/fusion/support/config.hpp>
11#include <boost/fusion/support/sequence_base.hpp>
12#include <boost/fusion/support/tag_of.hpp>
13#include <boost/fusion/support/detail/is_native_fusion_sequence.hpp>
14#include <boost/mpl/bool.hpp>
15#include <boost/mpl/is_sequence.hpp>
16#include <boost/type_traits/is_convertible.hpp>
17
18namespace boost { namespace fusion
19{
20 // Special tags:
21 struct non_fusion_tag;
22 struct boost_tuple_tag; // boost::tuples::tuple tag
23 struct boost_array_tag; // boost::array tag
24 struct mpl_sequence_tag; // mpl sequence tag
25 struct std_pair_tag; // std::pair tag
26
27 namespace extension
28 {
29 template <typename T>
30 struct is_sequence_impl
31 {
32 template <typename Sequence>
33 struct apply
34 : is_convertible<Sequence, fusion::detail::from_sequence_convertible_type>
35 {};
36 };
37
38 template <>
39 struct is_sequence_impl<non_fusion_tag>
40 {
41 template <typename T>
42 struct apply : mpl::false_ {};
43 };
44
45 template <>
46 struct is_sequence_impl<boost_tuple_tag>;
47
48 template <>
49 struct is_sequence_impl<boost_array_tag>;
50
51 template <>
52 struct is_sequence_impl<mpl_sequence_tag>;
53
54 template <>
55 struct is_sequence_impl<std_pair_tag>;
56 }
57
58 namespace traits
59 {
60 template <typename T>
61 struct is_sequence
62 : mpl::bool_<
63 (bool)extension::is_sequence_impl<
64 typename fusion::detail::tag_of<T>::type
65 >::template apply<T>::type::value
66 >
67 {};
68
69 using detail::is_native_fusion_sequence;
70 }
71}}
72
73#endif
74

source code of include/boost/fusion/support/is_sequence.hpp