1 | #ifndef BOOST_RANGE_COMBINE_HPP |
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2 | #define BOOST_RANGE_COMBINE_HPP |
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3 | |
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4 | #include <boost/iterator/zip_iterator.hpp> |
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5 | #include <boost/tuple/tuple.hpp> |
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6 | #include <boost/range/iterator.hpp> |
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7 | #include <boost/range/iterator_range.hpp> |
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8 | #include <boost/type_traits/is_void.hpp> |
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9 | #include <boost/type_traits/is_same.hpp> |
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10 | #include <boost/mpl/eval_if.hpp> |
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11 | #include <boost/mpl/int.hpp> |
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12 | #include <boost/mpl/plus.hpp> |
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13 | #include <boost/mpl/arithmetic.hpp> |
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14 | #include <boost/config.hpp> |
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15 | |
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16 | namespace boost |
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17 | { |
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18 | namespace range_detail |
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19 | { |
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20 | struct void_ { typedef void_ type; }; |
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21 | } |
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22 | |
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23 | template<> struct range_iterator< ::boost::range_detail::void_ > |
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24 | { |
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25 | typedef ::boost::tuples::null_type type; |
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26 | }; |
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27 | |
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28 | namespace range_detail |
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29 | { |
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30 | inline ::boost::tuples::null_type range_begin( ::boost::range_detail::void_& ) |
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31 | { return ::boost::tuples::null_type(); } |
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32 | |
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33 | inline ::boost::tuples::null_type range_begin( const ::boost::range_detail::void_& ) |
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34 | { return ::boost::tuples::null_type(); } |
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35 | |
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36 | inline ::boost::tuples::null_type range_end( ::boost::range_detail::void_& ) |
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37 | { return ::boost::tuples::null_type(); } |
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38 | |
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39 | inline ::boost::tuples::null_type range_end( const ::boost::range_detail::void_& ) |
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40 | { return ::boost::tuples::null_type(); } |
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41 | |
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42 | template< class T > |
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43 | struct tuple_iter |
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44 | { |
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45 | typedef BOOST_DEDUCED_TYPENAME ::boost::mpl::eval_if_c< |
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46 | ::boost::is_same<T, ::boost::range_detail::void_ >::value, |
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47 | ::boost::mpl::identity< ::boost::tuples::null_type >, |
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48 | ::boost::range_iterator<T> |
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49 | >::type type; |
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50 | }; |
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51 | |
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52 | template< class Rng1, class Rng2 > |
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53 | struct tuple_range |
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54 | { |
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55 | typedef BOOST_DEDUCED_TYPENAME ::boost::mpl::eval_if_c< |
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56 | ::boost::is_same<Rng1, ::boost::range_detail::void_ >::value, |
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57 | ::boost::range_detail::void_, |
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58 | ::boost::mpl::identity<Rng1> |
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59 | >::type type; |
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60 | }; |
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61 | |
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62 | template |
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63 | < |
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64 | class R1, |
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65 | class R2, |
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66 | class R3, |
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67 | class R4, |
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68 | class R5, |
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69 | class R6 |
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70 | > |
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71 | struct generate_tuple |
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72 | { |
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73 | typedef ::boost::tuples::tuple< |
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74 | BOOST_DEDUCED_TYPENAME tuple_iter<R1>::type, |
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75 | BOOST_DEDUCED_TYPENAME tuple_iter<R2>::type, |
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76 | BOOST_DEDUCED_TYPENAME tuple_iter<R3>::type, |
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77 | BOOST_DEDUCED_TYPENAME tuple_iter<R4>::type, |
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78 | BOOST_DEDUCED_TYPENAME tuple_iter<R5>::type, |
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79 | BOOST_DEDUCED_TYPENAME tuple_iter<R6>::type |
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80 | > type; |
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81 | |
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82 | static type begin( R1& r1, R2& r2, R3& r3, R4& r4, R5& r5, R6& r6 ) |
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83 | { |
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84 | return ::boost::tuples::make_tuple( ::boost::begin(r1), |
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85 | ::boost::begin(r2), |
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86 | ::boost::begin(r3), |
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87 | ::boost::begin(r4), |
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88 | ::boost::begin(r5), |
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89 | ::boost::begin(r6) ); |
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90 | } |
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91 | |
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92 | static type end( R1& r1, R2& r2, R3& r3, R4& r4, R5& r5, R6& r6 ) |
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93 | { |
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94 | return ::boost::tuples::make_tuple( ::boost::end(r1), |
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95 | ::boost::end(r2), |
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96 | ::boost::end(r3), |
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97 | ::boost::end(r4), |
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98 | ::boost::end(r5), |
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99 | ::boost::end(r6) ); |
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100 | } |
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101 | }; |
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102 | |
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103 | template |
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104 | < |
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105 | class R1, |
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106 | class R2 = void_, |
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107 | class R3 = void_, |
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108 | class R4 = void_, |
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109 | class R5 = void_, |
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110 | class R6 = void_ |
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111 | > |
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112 | struct zip_rng |
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113 | : iterator_range< |
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114 | zip_iterator< |
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115 | BOOST_DEDUCED_TYPENAME generate_tuple<R1,R2,R3,R4,R5,R6>::type |
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116 | > |
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117 | > |
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118 | { |
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119 | private: |
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120 | typedef generate_tuple<R1,R2,R3,R4,R5,R6> generator_t; |
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121 | typedef BOOST_DEDUCED_TYPENAME generator_t::type tuple_t; |
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122 | typedef zip_iterator<tuple_t> zip_iter_t; |
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123 | typedef iterator_range<zip_iter_t> base_t; |
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124 | |
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125 | public: |
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126 | zip_rng( R1& r1, R2& r2, R3& r3, R4& r4, R5& r5, R6& r6 ) |
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127 | : base_t( zip_iter_t( generator_t::begin(r1,r2,r3,r4,r5,r6) ), |
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128 | zip_iter_t( generator_t::end(r1,r2,r3,r4,r5,r6) ) ) |
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129 | { |
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130 | BOOST_ASSERT(::boost::distance(r1) <= ::boost::distance(r2)); |
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131 | BOOST_ASSERT(::boost::distance(r1) <= ::boost::distance(r3)); |
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132 | BOOST_ASSERT(::boost::distance(r1) <= ::boost::distance(r4)); |
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133 | BOOST_ASSERT(::boost::distance(r1) <= ::boost::distance(r5)); |
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134 | BOOST_ASSERT(::boost::distance(r1) <= ::boost::distance(r6)); |
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135 | } |
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136 | |
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137 | template< class Zip, class Rng > |
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138 | zip_rng( Zip& z, Rng& r ) |
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139 | : base_t( zip_iter_t( generator_t::begin( z, r ) ), |
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140 | zip_iter_t( generator_t::end( z, r ) ) ) |
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141 | { |
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142 | |
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143 | // @todo: tuple::begin( should be overloaded for this situation |
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144 | } |
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145 | |
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146 | struct tuple_length : ::boost::tuples::length<tuple_t> |
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147 | { }; |
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148 | |
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149 | template< unsigned N > |
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150 | struct get |
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151 | { |
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152 | template< class Z, class R > |
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153 | static BOOST_DEDUCED_TYPENAME ::boost::tuples::element<N,tuple_t>::type begin( Z& z, R& ) |
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154 | { |
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155 | return get<N>( z.begin().get_iterator_tuple() ); |
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156 | } |
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157 | |
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158 | template< class Z, class R > |
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159 | static BOOST_DEDUCED_TYPENAME ::boost::tuples::element<N,tuple_t>::type end( Z& z, R& r ) |
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160 | { |
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161 | return get<N>( z.end().get_iterator_tuple() ); |
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162 | } |
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163 | }; |
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164 | |
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165 | }; |
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166 | |
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167 | template< class Rng1, class Rng2 > |
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168 | struct zip_range |
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169 | : iterator_range< |
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170 | zip_iterator< |
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171 | ::boost::tuples::tuple< |
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172 | BOOST_DEDUCED_TYPENAME ::boost::range_iterator<Rng1>::type, |
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173 | BOOST_DEDUCED_TYPENAME ::boost::range_iterator<Rng2>::type |
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174 | > |
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175 | > |
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176 | > |
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177 | { |
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178 | private: |
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179 | typedef zip_iterator< |
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180 | ::boost::tuples::tuple< |
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181 | BOOST_DEDUCED_TYPENAME ::boost::range_iterator<Rng1>::type, |
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182 | BOOST_DEDUCED_TYPENAME ::boost::range_iterator<Rng2>::type |
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183 | > |
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184 | > zip_iter_t; |
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185 | typedef iterator_range<zip_iter_t> base_t; |
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186 | |
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187 | public: |
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188 | zip_range( Rng1& r1, Rng2& r2 ) |
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189 | : base_t( zip_iter_t( ::boost::tuples::make_tuple(::boost::begin(r1), |
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190 | ::boost::begin(r2)) ), |
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191 | zip_iter_t( ::boost::tuples::make_tuple(::boost::end(r1), |
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192 | ::boost::end(r2)) ) ) |
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193 | { |
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194 | BOOST_ASSERT(::boost::distance(r1) <= ::boost::distance(r2)); |
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195 | } |
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196 | }; |
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197 | |
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198 | template< class Rng1, class Rng2, class Rng3 > |
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199 | struct zip_range3 |
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200 | : iterator_range< |
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201 | zip_iterator< |
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202 | ::boost::tuples::tuple< |
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203 | BOOST_DEDUCED_TYPENAME ::boost::range_iterator<Rng1>::type, |
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204 | BOOST_DEDUCED_TYPENAME ::boost::range_iterator<Rng2>::type, |
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205 | BOOST_DEDUCED_TYPENAME ::boost::range_iterator<Rng3>::type |
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206 | > |
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207 | > |
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208 | > |
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209 | { |
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210 | private: |
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211 | typedef zip_iterator< |
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212 | ::boost::tuples::tuple< |
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213 | BOOST_DEDUCED_TYPENAME ::boost::range_iterator<Rng1>::type, |
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214 | BOOST_DEDUCED_TYPENAME ::boost::range_iterator<Rng2>::type, |
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215 | BOOST_DEDUCED_TYPENAME ::boost::range_iterator<Rng3>::type |
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216 | > |
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217 | > zip_iter_t; |
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218 | typedef iterator_range<zip_iter_t> base_t; |
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219 | |
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220 | public: |
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221 | zip_range3( Rng1& r1, Rng2& r2, Rng3& r3 ) |
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222 | : base_t( zip_iter_t( ::boost::tuples::make_tuple(::boost::begin(r1), |
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223 | ::boost::begin(r2), |
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224 | ::boost::begin(r3)) ), |
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225 | zip_iter_t( ::boost::tuples::make_tuple(::boost::end(r1), |
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226 | ::boost::end(r2), |
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227 | ::boost::end(r3)) ) |
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228 | ) |
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229 | { |
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230 | BOOST_ASSERT(::boost::distance(r1) <= ::boost::distance(r2)); |
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231 | BOOST_ASSERT(::boost::distance(r1) <= ::boost::distance(r3)); |
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232 | } |
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233 | }; |
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234 | |
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235 | |
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236 | struct combine_tag {}; |
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237 | |
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238 | template< class Rng > |
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239 | inline zip_rng<Rng> |
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240 | operator&( combine_tag, Rng& r ) |
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241 | { |
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242 | return zip_rng<Rng>(r); |
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243 | } |
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244 | |
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245 | template< class Rng > |
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246 | inline iterator_range<const Rng> |
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247 | operator&( combine_tag, const Rng& r ) |
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248 | { |
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249 | return iterator_range<const Rng>(r); |
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250 | } |
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251 | |
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252 | template |
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253 | < |
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254 | class R1, |
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255 | class R2, |
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256 | class R3, |
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257 | class R4, |
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258 | class R5, |
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259 | class Rng |
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260 | > |
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261 | inline BOOST_DEDUCED_TYPENAME zip_rng<R1,R2,R3,R4,R5>::next |
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262 | operator&( const zip_rng<R1,R2,R3,R4,R5>& zip, |
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263 | Rng& r ) |
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264 | { |
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265 | return zip_rng<R1,R2,R3,R4,R5>::next( zip, r ); |
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266 | } |
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267 | |
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268 | } // namespace range_detail |
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269 | |
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270 | template< class Rng1, class Rng2 > |
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271 | inline ::boost::range_detail::zip_range<Rng1, Rng2> combine( Rng1& r1, Rng2& r2 ) |
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272 | { |
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273 | return ::boost::range_detail::zip_range<Rng1, Rng2>(r1, r2); |
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274 | } |
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275 | |
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276 | template< class Rng1, class Rng2 > |
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277 | inline ::boost::range_detail::zip_range<const Rng1, Rng2> combine( const Rng1& r1, Rng2& r2 ) |
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278 | { |
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279 | return ::boost::range_detail::zip_range<const Rng1, Rng2>(r1, r2); |
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280 | } |
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281 | |
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282 | template< class Rng1, class Rng2 > |
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283 | inline ::boost::range_detail::zip_range<Rng1, const Rng2> combine( Rng1& r1, const Rng2& r2 ) |
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284 | { |
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285 | return ::boost::range_detail::zip_range<Rng1, const Rng2>(r1, r2); |
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286 | } |
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287 | |
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288 | template< class Rng1, class Rng2 > |
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289 | inline ::boost::range_detail::zip_range<const Rng1, const Rng2> combine( const Rng1& r1, const Rng2& r2 ) |
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290 | { |
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291 | return ::boost::range_detail::zip_range<const Rng1, const Rng2>(r1, r2); |
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292 | } |
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293 | |
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294 | } // namespace boost |
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295 | |
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296 | #endif |
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