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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 |