]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
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> | |
7c673cae FG |
12 | #include <boost/fusion/support/tag_of.hpp> |
13 | ||
14 | namespace boost { namespace fusion | |
15 | { | |
16 | // Special tags: | |
92f5a8d4 | 17 | struct non_fusion_tag; |
7c673cae FG |
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 | |
92f5a8d4 TL |
31 | { |
32 | typedef typename T::is_view type; | |
33 | }; | |
34 | }; | |
35 | ||
36 | template <> | |
37 | struct is_view_impl<non_fusion_tag> | |
38 | { | |
39 | template <typename T> | |
40 | struct apply : mpl::false_ {}; | |
7c673cae FG |
41 | }; |
42 | ||
43 | template <> | |
44 | struct is_view_impl<sequence_facade_tag> | |
45 | { | |
46 | template <typename Sequence> | |
47 | struct apply : Sequence::is_view {}; | |
48 | }; | |
49 | ||
50 | template <> | |
51 | struct is_view_impl<boost_tuple_tag>; | |
52 | ||
53 | template <> | |
54 | struct is_view_impl<boost_array_tag>; | |
55 | ||
56 | template <> | |
57 | struct is_view_impl<mpl_sequence_tag>; | |
58 | ||
59 | template <> | |
60 | struct is_view_impl<std_pair_tag>; | |
61 | } | |
62 | ||
63 | namespace traits | |
64 | { | |
65 | template <typename T> | |
66 | struct is_view : | |
67 | mpl::bool_< | |
68 | (bool)extension::is_view_impl<typename fusion::detail::tag_of<T>::type>:: | |
69 | template apply<T>::type::value | |
70 | > | |
71 | {}; | |
72 | } | |
73 | }} | |
74 | ||
75 | #endif |