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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
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_SEQUENCE_FILTER_VIEW_HPP) | |
8 | #define FUSION_SEQUENCE_FILTER_VIEW_HPP | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/fusion/support/detail/access.hpp> | |
12 | #include <boost/fusion/support/sequence_base.hpp> | |
13 | #include <boost/fusion/support/is_view.hpp> | |
14 | #include <boost/fusion/view/filter_view/filter_view_iterator.hpp> | |
15 | #include <boost/fusion/view/filter_view/detail/begin_impl.hpp> | |
16 | #include <boost/fusion/view/filter_view/detail/end_impl.hpp> | |
17 | #include <boost/fusion/view/filter_view/detail/size_impl.hpp> | |
18 | #include <boost/fusion/sequence/intrinsic/begin.hpp> | |
19 | #include <boost/fusion/sequence/intrinsic/end.hpp> | |
20 | #include <boost/mpl/bool.hpp> | |
21 | #include <boost/mpl/eval_if.hpp> | |
22 | #include <boost/mpl/inherit.hpp> | |
23 | #include <boost/mpl/identity.hpp> | |
24 | ||
25 | namespace boost { namespace fusion | |
26 | { | |
27 | struct filter_view_tag; | |
28 | struct forward_traversal_tag; | |
29 | struct fusion_sequence_tag; | |
30 | ||
31 | template <typename Sequence, typename Pred> | |
32 | struct filter_view : sequence_base<filter_view<Sequence, Pred> > | |
33 | { | |
34 | typedef filter_view_tag fusion_tag; | |
35 | typedef fusion_sequence_tag tag; // this gets picked up by MPL | |
36 | typedef typename | |
37 | mpl::eval_if< | |
38 | traits::is_associative<Sequence> | |
39 | , mpl::inherit2<forward_traversal_tag,associative_tag> | |
40 | , mpl::identity<forward_traversal_tag> | |
41 | >::type | |
42 | category; | |
43 | typedef mpl::true_ is_view; | |
44 | ||
45 | typedef typename result_of::begin<Sequence>::type first_type; | |
46 | typedef typename result_of::end<Sequence>::type last_type; | |
47 | typedef Pred pred_type; | |
48 | ||
49 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
50 | filter_view(Sequence& in_seq) | |
51 | : seq(in_seq) | |
52 | {} | |
53 | ||
54 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
55 | first_type first() const { return fusion::begin(seq); } | |
56 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
57 | last_type last() const { return fusion::end(seq); } | |
58 | typename mpl::if_<traits::is_view<Sequence>, Sequence, Sequence&>::type seq; | |
59 | ||
7c673cae | 60 | // silence MSVC warning C4512: assignment operator could not be generated |
f67539c2 | 61 | BOOST_DELETED_FUNCTION(filter_view& operator= (filter_view const&)) |
7c673cae FG |
62 | }; |
63 | }} | |
64 | ||
65 | #endif | |
66 | ||
67 |