1 | /*============================================================================= |
2 | Copyright (c) 2006 Eric Niebler |
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_SEGMENTED_03202006_0015) |
8 | #define FUSION_IS_SEGMENTED_03202006_0015 |
9 | |
10 | #include <boost/fusion/support/config.hpp> |
11 | #include <boost/mpl/bool.hpp> |
12 | #include <boost/fusion/support/tag_of.hpp> |
13 | |
14 | namespace boost { namespace fusion |
15 | { |
16 | // Special tags: |
17 | struct sequence_facade_tag; |
18 | struct iterator_range_tag; |
19 | |
20 | namespace extension |
21 | { |
22 | template <typename Tag> |
23 | struct is_segmented_impl |
24 | { |
25 | template <typename Sequence> |
26 | struct apply |
27 | : mpl::false_ |
28 | {}; |
29 | }; |
30 | |
31 | template <> |
32 | struct is_segmented_impl<sequence_facade_tag> |
33 | { |
34 | template <typename Sequence> |
35 | struct apply : Sequence::is_segmented {}; |
36 | }; |
37 | |
38 | template <> |
39 | struct is_segmented_impl<iterator_range_tag>; |
40 | } |
41 | |
42 | namespace traits |
43 | { |
44 | template <typename Sequence> |
45 | struct is_segmented |
46 | : mpl::bool_< |
47 | (bool)extension::is_segmented_impl<typename traits::tag_of<Sequence>::type>:: |
48 | template apply<Sequence>::type::value |
49 | > |
50 | { |
51 | }; |
52 | } |
53 | }} |
54 | |
55 | #endif |
56 | |