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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_IS_VIEW_03202006_0015) | |
8 | #define FUSION_IS_VIEW_03202006_0015 | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/mpl/bool.hpp> | |
12 | #include <boost/fusion/support/detail/is_view.hpp> | |
13 | #include <boost/fusion/support/tag_of.hpp> | |
14 | ||
15 | namespace boost { namespace fusion | |
16 | { | |
17 | // Special tags: | |
18 | struct sequence_facade_tag; | |
19 | struct boost_tuple_tag; // boost::tuples::tuple tag | |
20 | struct boost_array_tag; // boost::array tag | |
21 | struct mpl_sequence_tag; // mpl sequence tag | |
22 | struct std_pair_tag; // std::pair tag | |
23 | ||
24 | namespace extension | |
25 | { | |
26 | template<typename Tag> | |
27 | struct is_view_impl | |
28 | { | |
29 | template <typename T> | |
30 | struct apply | |
31 | : detail::fusion_is_view<T> | |
32 | {}; | |
33 | }; | |
34 | ||
35 | template <> | |
36 | struct is_view_impl<sequence_facade_tag> | |
37 | { | |
38 | template <typename Sequence> | |
39 | struct apply : Sequence::is_view {}; | |
40 | }; | |
41 | ||
42 | template <> | |
43 | struct is_view_impl<boost_tuple_tag>; | |
44 | ||
45 | template <> | |
46 | struct is_view_impl<boost_array_tag>; | |
47 | ||
48 | template <> | |
49 | struct is_view_impl<mpl_sequence_tag>; | |
50 | ||
51 | template <> | |
52 | struct is_view_impl<std_pair_tag>; | |
53 | } | |
54 | ||
55 | namespace traits | |
56 | { | |
57 | template <typename T> | |
58 | struct is_view : | |
59 | mpl::bool_< | |
60 | (bool)extension::is_view_impl<typename fusion::detail::tag_of<T>::type>:: | |
61 | template apply<T>::type::value | |
62 | > | |
63 | {}; | |
64 | } | |
65 | }} | |
66 | ||
67 | #endif |