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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