1 | /*============================================================================= |
---|---|
2 | Copyright (c) 2011 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(BOOST_FUSION_SEGMENTED_SEQUENCE_HPP_INCLUDED) |
8 | #define BOOST_FUSION_SEGMENTED_SEQUENCE_HPP_INCLUDED |
9 | |
10 | #include <boost/fusion/support/config.hpp> |
11 | #include <boost/mpl/bool.hpp> |
12 | #include <boost/type_traits/remove_reference.hpp> |
13 | #include <boost/fusion/support/tag_of.hpp> |
14 | #include <boost/fusion/sequence/intrinsic_fwd.hpp> |
15 | |
16 | namespace boost { namespace fusion { namespace detail |
17 | { |
18 | struct segment_sequence_tag {}; |
19 | |
20 | // Here, Sequence is a sequence of ranges (which may or may not be |
21 | // segmented). |
22 | template<typename Sequence> |
23 | struct segment_sequence |
24 | : sequence_base<segment_sequence<Sequence> > |
25 | { |
26 | typedef fusion_sequence_tag tag; |
27 | typedef segment_sequence_tag fusion_tag; |
28 | typedef typename Sequence::is_view is_view; |
29 | typedef typename Sequence::category category; |
30 | typedef Sequence sequence_type; |
31 | sequence_type sequence; |
32 | |
33 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED explicit segment_sequence(Sequence const & seq) |
34 | : sequence(seq) |
35 | {} |
36 | }; |
37 | } |
38 | |
39 | namespace extension |
40 | { |
41 | template<typename Tag> |
42 | struct is_segmented_impl; |
43 | |
44 | template<> |
45 | struct is_segmented_impl<detail::segment_sequence_tag> |
46 | { |
47 | template<typename Sequence> |
48 | struct apply |
49 | : mpl::true_ |
50 | {}; |
51 | }; |
52 | |
53 | template<typename Tag> |
54 | struct segments_impl; |
55 | |
56 | template<> |
57 | struct segments_impl<detail::segment_sequence_tag> |
58 | { |
59 | template<typename Sequence> |
60 | struct apply |
61 | { |
62 | typedef typename Sequence::sequence_type type; |
63 | |
64 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
65 | static type call(Sequence & seq) |
66 | { |
67 | return seq.sequence; |
68 | } |
69 | }; |
70 | }; |
71 | }}} |
72 | |
73 | #endif |
74 |