[857] | 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 | // $Source: /cvsroot/boost/boost/boost/mpl/aux_/filter_iter.hpp,v $
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| 14 | // $Date: 2004/09/07 12:07:56 $
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| 15 | // $Revision: 1.4 $
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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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