[857] | 1 | /*=============================================================================
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| 2 | Copyright (c) 2003 Joel de Guzman
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| 3 |
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| 4 | Use, modification and distribution is subject to the Boost Software
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| 5 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 6 | http://www.boost.org/LICENSE_1_0.txt)
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| 7 | ==============================================================================*/
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| 8 | #if !defined(FUSION_SEQUENCE_DETAIL_FILTER_VIEW_BEGIN_END_TRAITS_HPP)
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| 9 | #define FUSION_SEQUENCE_DETAIL_FILTER_VIEW_BEGIN_END_TRAITS_HPP
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| 10 |
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| 11 | #include <boost/spirit/fusion/detail/config.hpp>
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| 12 |
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| 13 | namespace boost { namespace fusion
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| 14 | {
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| 15 | struct filter_view_tag;
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| 16 |
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| 17 | template <typename View, typename Pred>
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| 18 | struct filter_view;
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| 19 |
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| 20 | template <typename First, typename Last, typename Pred>
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| 21 | struct filter_iterator;
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| 22 |
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| 23 | namespace meta
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| 24 | {
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| 25 | template <typename Tag>
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| 26 | struct begin_impl;
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| 27 |
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| 28 | template <>
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| 29 | struct begin_impl<filter_view_tag>
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| 30 | {
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| 31 | template <typename Sequence>
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| 32 | struct apply
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| 33 | {
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| 34 | typedef typename Sequence::first_type first_type;
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| 35 | typedef typename Sequence::last_type last_type;
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| 36 | typedef typename Sequence::pred_type pred_type;
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| 37 | typedef filter_iterator<first_type, last_type, pred_type> type;
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| 38 |
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| 39 | static type
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| 40 | call(Sequence& s)
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| 41 | {
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| 42 | return type(s.first);
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| 43 | }
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| 44 | };
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| 45 | };
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| 46 |
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| 47 | template <typename Tag>
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| 48 | struct end_impl;
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| 49 |
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| 50 | template <>
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| 51 | struct end_impl<filter_view_tag>
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| 52 | {
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| 53 | template <typename Sequence>
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| 54 | struct apply
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| 55 | {
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| 56 | typedef typename Sequence::last_type last_type;
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| 57 | typedef typename Sequence::pred_type pred_type;
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| 58 | typedef filter_iterator<last_type, last_type, pred_type> type;
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| 59 |
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| 60 | static type
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| 61 | call(Sequence& s)
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| 62 | {
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| 63 | return type(s.last);
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| 64 | }
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| 65 | };
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| 66 | };
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| 67 | }
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| 68 | }}
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| 69 |
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| 70 | namespace boost { namespace mpl
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| 71 | {
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| 72 | template <typename Tag>
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| 73 | struct begin_impl;
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| 74 |
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| 75 | template <typename Tag>
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| 76 | struct end_impl;
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| 77 |
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| 78 | template <>
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| 79 | struct begin_impl<fusion::filter_view_tag>
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| 80 | : fusion::meta::begin_impl<fusion::filter_view_tag> {};
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| 81 |
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| 82 | template <>
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| 83 | struct end_impl<fusion::filter_view_tag>
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| 84 | : fusion::meta::end_impl<fusion::filter_view_tag> {};
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| 85 | }}
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| 86 |
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| 87 | #endif
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| 88 |
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| 89 |
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