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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 |