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