1 | // Boost.Range library |
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2 | // |
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3 | // Copyright Thorsten Ottosen, Neil Groves 2006 - 2008. Use, modification and |
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4 | // distribution is subject to the Boost Software License, Version |
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5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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6 | // http://www.boost.org/LICENSE_1_0.txt) |
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7 | // |
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8 | // For more information, see http://www.boost.org/libs/range/ |
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9 | // |
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10 | |
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11 | #ifndef BOOST_RANGE_ADAPTOR_MAP_HPP |
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12 | #define BOOST_RANGE_ADAPTOR_MAP_HPP |
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13 | |
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14 | #include <boost/range/adaptor/transformed.hpp> |
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15 | #include <boost/range/iterator_range.hpp> |
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16 | #include <boost/range/value_type.hpp> |
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17 | |
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18 | namespace boost |
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19 | { |
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20 | namespace range_detail |
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21 | { |
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22 | struct map_keys_forwarder {}; |
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23 | struct map_values_forwarder {}; |
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24 | |
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25 | template< class Map > |
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26 | struct select_first |
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27 | { |
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28 | typedef BOOST_DEDUCED_TYPENAME range_value<Map>::type pair_t; |
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29 | typedef const BOOST_DEDUCED_TYPENAME pair_t::first_type& |
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30 | result_type; |
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31 | |
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32 | result_type operator()( const pair_t& r ) const |
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33 | { |
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34 | return r.first; |
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35 | } |
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36 | }; |
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37 | |
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38 | template< class Map > |
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39 | struct select_second_mutable |
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40 | { |
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41 | typedef BOOST_DEDUCED_TYPENAME range_value<Map>::type pair_t; |
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42 | typedef BOOST_DEDUCED_TYPENAME pair_t::second_type& result_type; |
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43 | |
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44 | result_type operator()( pair_t& r ) const |
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45 | { |
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46 | return r.second; |
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47 | } |
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48 | }; |
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49 | |
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50 | template< class Map > |
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51 | struct select_second_const |
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52 | { |
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53 | typedef BOOST_DEDUCED_TYPENAME range_value<Map>::type pair_t; |
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54 | typedef const BOOST_DEDUCED_TYPENAME pair_t::second_type& |
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55 | result_type; |
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56 | |
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57 | result_type operator()( const pair_t& r ) const |
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58 | { |
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59 | return r.second; |
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60 | } |
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61 | }; |
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62 | |
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63 | template<class StdPairRng> |
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64 | class select_first_range |
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65 | : public transform_range< |
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66 | select_first<StdPairRng>, |
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67 | const StdPairRng> |
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68 | { |
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69 | typedef transform_range<select_first<StdPairRng>, const StdPairRng> base; |
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70 | public: |
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71 | typedef select_first<StdPairRng> transform_fn_type; |
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72 | typedef const StdPairRng source_range_type; |
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73 | |
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74 | select_first_range(transform_fn_type fn, source_range_type& rng) |
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75 | : base(fn, rng) |
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76 | { |
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77 | } |
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78 | |
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79 | select_first_range(const base& other) : base(other) {} |
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80 | }; |
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81 | |
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82 | template<class StdPairRng> |
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83 | class select_second_mutable_range |
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84 | : public transform_range< |
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85 | select_second_mutable<StdPairRng>, |
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86 | StdPairRng> |
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87 | { |
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88 | typedef transform_range<select_second_mutable<StdPairRng>, StdPairRng> base; |
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89 | public: |
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90 | typedef select_second_mutable<StdPairRng> transform_fn_type; |
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91 | typedef StdPairRng source_range_type; |
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92 | |
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93 | select_second_mutable_range(transform_fn_type fn, source_range_type& rng) |
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94 | : base(fn, rng) |
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95 | { |
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96 | } |
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97 | |
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98 | select_second_mutable_range(const base& other) : base(other) {} |
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99 | }; |
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100 | |
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101 | template<class StdPairRng> |
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102 | class select_second_const_range |
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103 | : public transform_range< |
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104 | select_second_const<StdPairRng>, |
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105 | const StdPairRng> |
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106 | { |
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107 | typedef transform_range<select_second_const<StdPairRng>, const StdPairRng> base; |
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108 | public: |
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109 | typedef select_second_const<StdPairRng> transform_fn_type; |
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110 | typedef const StdPairRng source_range_type; |
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111 | |
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112 | select_second_const_range(transform_fn_type fn, source_range_type& rng) |
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113 | : base(fn, rng) |
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114 | { |
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115 | } |
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116 | |
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117 | select_second_const_range(const base& other) : base(other) {} |
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118 | }; |
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119 | |
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120 | template< class StdPairRng > |
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121 | inline select_first_range<StdPairRng> |
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122 | operator|( const StdPairRng& r, map_keys_forwarder ) |
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123 | { |
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124 | return operator|( r, |
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125 | boost::adaptors::transformed( select_first<StdPairRng>() ) ); |
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126 | } |
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127 | |
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128 | template< class StdPairRng > |
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129 | inline select_second_mutable_range<StdPairRng> |
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130 | operator|( StdPairRng& r, map_values_forwarder ) |
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131 | { |
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132 | return operator|( r, |
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133 | boost::adaptors::transformed( select_second_mutable<StdPairRng>() ) ); |
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134 | } |
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135 | |
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136 | template< class StdPairRng > |
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137 | inline select_second_const_range<StdPairRng> |
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138 | operator|( const StdPairRng& r, map_values_forwarder ) |
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139 | { |
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140 | return operator|( r, |
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141 | boost::adaptors::transformed( select_second_const<StdPairRng>() ) ); |
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142 | } |
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143 | |
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144 | } // 'range_detail' |
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145 | |
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146 | using range_detail::select_first_range; |
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147 | using range_detail::select_second_mutable_range; |
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148 | using range_detail::select_second_const_range; |
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149 | |
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150 | namespace adaptors |
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151 | { |
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152 | namespace |
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153 | { |
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154 | const range_detail::map_keys_forwarder map_keys = |
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155 | range_detail::map_keys_forwarder(); |
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156 | |
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157 | const range_detail::map_values_forwarder map_values = |
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158 | range_detail::map_values_forwarder(); |
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159 | } |
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160 | |
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161 | template<class StdPairRange> |
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162 | inline select_first_range<StdPairRange> |
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163 | keys(const StdPairRange& rng) |
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164 | { |
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165 | return select_first_range<StdPairRange>( |
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166 | range_detail::select_first<StdPairRange>(), rng ); |
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167 | } |
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168 | |
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169 | template<class StdPairRange> |
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170 | inline select_second_const_range<StdPairRange> |
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171 | values(const StdPairRange& rng) |
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172 | { |
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173 | return select_second_const_range<StdPairRange>( |
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174 | range_detail::select_second_const<StdPairRange>(), rng ); |
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175 | } |
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176 | |
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177 | template<class StdPairRange> |
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178 | inline select_second_mutable_range<StdPairRange> |
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179 | values(StdPairRange& rng) |
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180 | { |
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181 | return select_second_mutable_range<StdPairRange>( |
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182 | range_detail::select_second_mutable<StdPairRange>(), rng ); |
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183 | } |
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184 | } // 'adaptors' |
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185 | |
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186 | } |
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187 | |
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188 | #endif |
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