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2 | #ifndef BOOST_MPL_PAIR_VIEW_HPP_INCLUDED |
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3 | #define BOOST_MPL_PAIR_VIEW_HPP_INCLUDED |
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4 | |
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5 | // Copyright David Abrahams 2003-2004 |
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6 | // Copyright Aleksey Gurtovoy 2004 |
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7 | // |
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8 | // Distributed under the Boost Software License, Version 1.0. |
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9 | // (See accompanying file LICENSE_1_0.txt or copy at |
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10 | // http://www.boost.org/LICENSE_1_0.txt) |
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11 | // |
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12 | // See http://www.boost.org/libs/mpl for documentation. |
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13 | |
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14 | // $Id$ |
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15 | // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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16 | // $Revision: 49267 $ |
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17 | |
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18 | #include <boost/mpl/begin_end.hpp> |
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19 | #include <boost/mpl/iterator_category.hpp> |
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20 | #include <boost/mpl/advance.hpp> |
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21 | #include <boost/mpl/distance.hpp> |
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22 | #include <boost/mpl/next_prior.hpp> |
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23 | #include <boost/mpl/deref.hpp> |
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24 | #include <boost/mpl/min_max.hpp> |
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25 | #include <boost/mpl/pair.hpp> |
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26 | #include <boost/mpl/iterator_tags.hpp> |
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27 | #include <boost/mpl/aux_/config/ctps.hpp> |
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28 | #include <boost/mpl/aux_/na_spec.hpp> |
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29 | |
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30 | namespace boost { namespace mpl { |
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31 | |
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32 | namespace aux { |
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33 | struct pair_iter_tag; |
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34 | |
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35 | #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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36 | |
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37 | template< typename Iter1, typename Iter2, typename Category > |
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38 | struct pair_iter; |
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39 | |
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40 | template< typename Category > struct prior_pair_iter |
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41 | { |
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42 | template< typename Iter1, typename Iter2 > struct apply |
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43 | { |
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44 | typedef typename mpl::prior<Iter1>::type i1_; |
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45 | typedef typename mpl::prior<Iter2>::type i2_; |
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46 | typedef pair_iter<i1_,i2_,Category> type; |
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47 | }; |
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48 | }; |
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49 | |
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50 | template<> struct prior_pair_iter<forward_iterator_tag> |
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51 | { |
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52 | template< typename Iter1, typename Iter2 > struct apply |
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53 | { |
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54 | typedef pair_iter<Iter1,Iter2,forward_iterator_tag> type; |
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55 | }; |
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56 | }; |
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57 | |
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58 | #endif |
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59 | } |
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60 | |
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61 | template< |
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62 | typename Iter1 |
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63 | , typename Iter2 |
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64 | , typename Category |
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65 | > |
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66 | struct pair_iter |
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67 | { |
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68 | typedef aux::pair_iter_tag tag; |
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69 | typedef Category category; |
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70 | typedef Iter1 first; |
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71 | typedef Iter2 second; |
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72 | |
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73 | #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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74 | typedef pair< |
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75 | typename deref<Iter1>::type |
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76 | , typename deref<Iter2>::type |
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77 | > type; |
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78 | |
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79 | typedef typename mpl::next<Iter1>::type i1_; |
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80 | typedef typename mpl::next<Iter2>::type i2_; |
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81 | typedef pair_iter<i1_,i2_,Category> next; |
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82 | |
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83 | typedef apply_wrap2< aux::prior_pair_iter<Category>,Iter1,Iter2 >::type prior; |
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84 | #endif |
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85 | }; |
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86 | |
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87 | |
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88 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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89 | |
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90 | template< typename Iter1, typename Iter2, typename C > |
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91 | struct deref< pair_iter<Iter1,Iter2,C> > |
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92 | { |
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93 | typedef pair< |
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94 | typename deref<Iter1>::type |
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95 | , typename deref<Iter2>::type |
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96 | > type; |
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97 | }; |
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98 | |
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99 | template< typename Iter1, typename Iter2, typename C > |
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100 | struct next< pair_iter<Iter1,Iter2,C> > |
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101 | { |
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102 | typedef typename mpl::next<Iter1>::type i1_; |
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103 | typedef typename mpl::next<Iter2>::type i2_; |
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104 | typedef pair_iter<i1_,i2_,C> type; |
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105 | }; |
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106 | |
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107 | template< typename Iter1, typename Iter2, typename C > |
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108 | struct prior< pair_iter<Iter1,Iter2,C> > |
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109 | { |
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110 | typedef typename mpl::prior<Iter1>::type i1_; |
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111 | typedef typename mpl::prior<Iter2>::type i2_; |
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112 | typedef pair_iter<i1_,i2_,C> type; |
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113 | }; |
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114 | |
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115 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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116 | |
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117 | |
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118 | template<> struct advance_impl<aux::pair_iter_tag> |
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119 | { |
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120 | template< typename Iter, typename D > struct apply |
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121 | { |
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122 | typedef typename mpl::advance< typename Iter::first,D >::type i1_; |
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123 | typedef typename mpl::advance< typename Iter::second,D >::type i2_; |
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124 | typedef pair_iter<i1_,i2_,typename Iter::category> type; |
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125 | }; |
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126 | }; |
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127 | |
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128 | template<> struct distance_impl<aux::pair_iter_tag> |
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129 | { |
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130 | template< typename Iter1, typename Iter2 > struct apply |
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131 | { |
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132 | // agurt, 10/nov/04: MSVC 6.5 ICE-s on forwarding |
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133 | typedef typename mpl::distance< |
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134 | typename first<Iter1>::type |
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135 | , typename first<Iter2>::type |
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136 | >::type type; |
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137 | }; |
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138 | }; |
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139 | |
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140 | |
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141 | template< |
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142 | typename BOOST_MPL_AUX_NA_PARAM(Sequence1) |
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143 | , typename BOOST_MPL_AUX_NA_PARAM(Sequence2) |
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144 | > |
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145 | struct pair_view |
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146 | { |
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147 | typedef nested_begin_end_tag tag; |
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148 | |
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149 | typedef typename begin<Sequence1>::type iter1_; |
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150 | typedef typename begin<Sequence2>::type iter2_; |
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151 | typedef typename min< |
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152 | typename iterator_category<iter1_>::type |
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153 | , typename iterator_category<iter2_>::type |
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154 | >::type category_; |
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155 | |
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156 | typedef pair_iter<iter1_,iter2_,category_> begin; |
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157 | |
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158 | typedef pair_iter< |
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159 | typename end<Sequence1>::type |
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160 | , typename end<Sequence2>::type |
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161 | , category_ |
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162 | > end; |
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163 | }; |
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164 | |
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165 | BOOST_MPL_AUX_NA_SPEC(2, pair_view) |
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166 | |
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167 | }} |
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168 | |
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169 | #endif // BOOST_MPL_PAIR_VIEW_HPP_INCLUDED |
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