[3428] | 1 | |
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| 2 | #ifndef BOOST_MPL_AUX_FILTER_ITER_HPP_INCLUDED |
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| 3 | #define BOOST_MPL_AUX_FILTER_ITER_HPP_INCLUDED |
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| 4 | |
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| 5 | // Copyright Aleksey Gurtovoy 2000-2004 |
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| 6 | // |
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| 7 | // Distributed under the Boost Software License, Version 1.0. |
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| 8 | // (See accompanying file LICENSE_1_0.txt or copy at |
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| 9 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 10 | // |
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| 11 | // See http://www.boost.org/libs/mpl for documentation. |
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| 12 | |
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| 13 | // $Id: filter_iter.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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| 14 | // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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| 15 | // $Revision: 49267 $ |
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| 16 | |
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| 17 | #include <boost/mpl/find_if.hpp> |
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| 18 | #include <boost/mpl/iterator_range.hpp> |
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| 19 | #include <boost/mpl/iterator_tags.hpp> |
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| 20 | #include <boost/mpl/deref.hpp> |
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| 21 | #include <boost/mpl/aux_/lambda_spec.hpp> |
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| 22 | #include <boost/mpl/aux_/config/ctps.hpp> |
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| 23 | #include <boost/type_traits/is_same.hpp> |
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| 24 | |
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| 25 | namespace boost { namespace mpl { |
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| 26 | |
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| 27 | namespace aux { |
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| 28 | |
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| 29 | template< |
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| 30 | typename Iterator |
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| 31 | , typename LastIterator |
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| 32 | , typename Predicate |
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| 33 | > |
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| 34 | struct filter_iter; |
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| 35 | |
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| 36 | template< |
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| 37 | typename Iterator |
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| 38 | , typename LastIterator |
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| 39 | , typename Predicate |
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| 40 | > |
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| 41 | struct next_filter_iter |
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| 42 | { |
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| 43 | typedef typename find_if< |
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| 44 | iterator_range<Iterator,LastIterator> |
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| 45 | , Predicate |
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| 46 | >::type base_iter_; |
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| 47 | |
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| 48 | typedef filter_iter<base_iter_,LastIterator,Predicate> type; |
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| 49 | }; |
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| 50 | |
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| 51 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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| 52 | |
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| 53 | template< |
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| 54 | typename Iterator |
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| 55 | , typename LastIterator |
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| 56 | , typename Predicate |
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| 57 | > |
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| 58 | struct filter_iter |
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| 59 | { |
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| 60 | typedef Iterator base; |
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| 61 | typedef forward_iterator_tag category; |
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| 62 | typedef typename aux::next_filter_iter< |
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| 63 | typename mpl::next<base>::type |
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| 64 | , LastIterator |
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| 65 | , Predicate |
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| 66 | >::type next; |
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| 67 | |
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| 68 | typedef typename deref<base>::type type; |
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| 69 | }; |
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| 70 | |
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| 71 | template< |
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| 72 | typename LastIterator |
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| 73 | , typename Predicate |
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| 74 | > |
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| 75 | struct filter_iter< LastIterator,LastIterator,Predicate > |
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| 76 | { |
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| 77 | typedef LastIterator base; |
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| 78 | typedef forward_iterator_tag category; |
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| 79 | }; |
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| 80 | |
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| 81 | #else |
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| 82 | |
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| 83 | template< bool > |
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| 84 | struct filter_iter_impl |
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| 85 | { |
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| 86 | template< |
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| 87 | typename Iterator |
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| 88 | , typename LastIterator |
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| 89 | , typename Predicate |
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| 90 | > |
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| 91 | struct result_ |
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| 92 | { |
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| 93 | typedef Iterator base; |
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| 94 | typedef forward_iterator_tag category; |
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| 95 | typedef typename next_filter_iter< |
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| 96 | typename mpl::next<Iterator>::type |
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| 97 | , LastIterator |
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| 98 | , Predicate |
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| 99 | >::type next; |
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| 100 | |
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| 101 | typedef typename deref<base>::type type; |
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| 102 | }; |
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| 103 | }; |
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| 104 | |
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| 105 | template<> |
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| 106 | struct filter_iter_impl< true > |
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| 107 | { |
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| 108 | template< |
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| 109 | typename Iterator |
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| 110 | , typename LastIterator |
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| 111 | , typename Predicate |
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| 112 | > |
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| 113 | struct result_ |
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| 114 | { |
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| 115 | typedef Iterator base; |
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| 116 | typedef forward_iterator_tag category; |
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| 117 | }; |
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| 118 | }; |
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| 119 | |
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| 120 | template< |
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| 121 | typename Iterator |
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| 122 | , typename LastIterator |
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| 123 | , typename Predicate |
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| 124 | > |
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| 125 | struct filter_iter |
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| 126 | : filter_iter_impl< |
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| 127 | ::boost::is_same<Iterator,LastIterator>::value |
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| 128 | >::template result_< Iterator,LastIterator,Predicate > |
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| 129 | { |
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| 130 | }; |
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| 131 | |
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| 132 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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| 133 | |
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| 134 | } // namespace aux |
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| 135 | |
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| 136 | BOOST_MPL_AUX_PASS_THROUGH_LAMBDA_SPEC(3, aux::filter_iter) |
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| 137 | |
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| 138 | }} |
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| 139 | |
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| 140 | #endif // BOOST_MPL_AUX_FILTER_ITER_HPP_INCLUDED |
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