1 | // -*- C++ -*- |
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2 | /*************************************************************************** |
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3 | * blitz/array/cartesian.h Cartesian product of indirection containers |
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4 | * |
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5 | * $Id$ |
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6 | * |
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7 | * Copyright (C) 1997-2011 Todd Veldhuizen <tveldhui@acm.org> |
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8 | * |
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9 | * This file is a part of Blitz. |
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10 | * |
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11 | * Blitz is free software: you can redistribute it and/or modify |
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12 | * it under the terms of the GNU Lesser General Public License |
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13 | * as published by the Free Software Foundation, either version 3 |
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14 | * of the License, or (at your option) any later version. |
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15 | * |
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16 | * Blitz is distributed in the hope that it will be useful, |
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17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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19 | * GNU Lesser General Public License for more details. |
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20 | * |
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21 | * You should have received a copy of the GNU Lesser General Public |
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22 | * License along with Blitz. If not, see <http://www.gnu.org/licenses/>. |
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23 | * |
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24 | * Suggestions: blitz-devel@lists.sourceforge.net |
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25 | * Bugs: blitz-support@lists.sourceforge.net |
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26 | * |
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27 | * For more information, please see the Blitz++ Home Page: |
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28 | * https://sourceforge.net/projects/blitz/ |
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29 | * |
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30 | ****************************************************************************/ |
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31 | #ifndef BZ_ARRAY_CARTESIAN_H |
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32 | #define BZ_ARRAY_CARTESIAN_H |
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33 | |
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34 | BZ_NAMESPACE(blitz) |
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35 | |
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36 | /* |
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37 | * CartesianProduct<T_tuple,T_container> is an adaptor which represents |
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38 | * the cartesian product of several containers. |
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39 | */ |
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40 | |
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41 | // forward declaration of iterator |
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42 | template<typename T_tuple, typename T_container, int N_containers> |
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43 | class CartesianProductIterator; |
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44 | |
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45 | struct _cp_end_tag { }; |
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46 | |
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47 | template<typename T_tuple, typename T_container, int N_containers> |
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48 | class CartesianProduct { |
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49 | public: |
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50 | typedef T_tuple value_type; |
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51 | typedef T_tuple& reference; |
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52 | typedef const T_tuple& const_reference; |
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53 | typedef CartesianProductIterator<T_tuple,T_container,N_containers> iterator; |
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54 | |
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55 | iterator begin() |
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56 | { return iterator(*this); } |
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57 | |
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58 | iterator end() |
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59 | { return iterator(_cp_end_tag()); } |
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60 | |
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61 | CartesianProduct(const T_container& container0, |
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62 | const T_container& container1) |
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63 | { |
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64 | BZPRECONDITION(N_containers == 2); |
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65 | containers_[0] = &container0; |
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66 | containers_[1] = &container1; |
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67 | } |
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68 | |
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69 | CartesianProduct(const T_container& container0, |
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70 | const T_container& container1, |
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71 | const T_container& container2) |
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72 | { |
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73 | BZPRECONDITION(N_containers == 3); |
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74 | containers_[0] = &container0; |
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75 | containers_[1] = &container1; |
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76 | containers_[2] = &container2; |
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77 | } |
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78 | |
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79 | CartesianProduct(const T_container& container0, |
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80 | const T_container& container1, |
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81 | const T_container& container2, |
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82 | const T_container& container3) |
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83 | { |
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84 | BZPRECONDITION(N_containers == 4); |
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85 | containers_[0] = &container0; |
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86 | containers_[1] = &container1; |
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87 | containers_[2] = &container2; |
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88 | containers_[3] = &container3; |
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89 | } |
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90 | |
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91 | CartesianProduct(const T_container& container0, |
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92 | const T_container& container1, |
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93 | const T_container& container2, |
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94 | const T_container& container3, |
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95 | const T_container& container4) |
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96 | { |
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97 | BZPRECONDITION(N_containers == 5); |
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98 | containers_[0] = &container0; |
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99 | containers_[1] = &container1; |
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100 | containers_[2] = &container2; |
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101 | containers_[3] = &container3; |
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102 | containers_[4] = &container4; |
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103 | } |
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104 | |
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105 | CartesianProduct(const T_container& container0, |
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106 | const T_container& container1, |
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107 | const T_container& container2, |
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108 | const T_container& container3, |
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109 | const T_container& container4, |
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110 | const T_container& container5) |
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111 | { |
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112 | BZPRECONDITION(N_containers == 6); |
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113 | containers_[0] = &container0; |
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114 | containers_[1] = &container1; |
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115 | containers_[2] = &container2; |
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116 | containers_[3] = &container3; |
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117 | containers_[4] = &container4; |
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118 | containers_[5] = &container5; |
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119 | } |
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120 | |
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121 | CartesianProduct(const T_container& container0, |
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122 | const T_container& container1, |
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123 | const T_container& container2, |
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124 | const T_container& container3, |
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125 | const T_container& container4, |
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126 | const T_container& container5, |
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127 | const T_container& container6) |
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128 | { |
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129 | BZPRECONDITION(N_containers == 7); |
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130 | containers_[0] = &container0; |
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131 | containers_[1] = &container1; |
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132 | containers_[2] = &container2; |
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133 | containers_[3] = &container3; |
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134 | containers_[4] = &container4; |
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135 | containers_[5] = &container5; |
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136 | containers_[6] = &container6; |
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137 | } |
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138 | |
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139 | CartesianProduct(const T_container& container0, |
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140 | const T_container& container1, |
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141 | const T_container& container2, |
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142 | const T_container& container3, |
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143 | const T_container& container4, |
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144 | const T_container& container5, |
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145 | const T_container& container6, |
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146 | const T_container& container7) |
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147 | { |
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148 | BZPRECONDITION(N_containers == 8); |
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149 | containers_[0] = &container0; |
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150 | containers_[1] = &container1; |
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151 | containers_[2] = &container2; |
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152 | containers_[3] = &container3; |
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153 | containers_[4] = &container4; |
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154 | containers_[5] = &container5; |
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155 | containers_[6] = &container6; |
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156 | containers_[7] = &container7; |
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157 | } |
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158 | |
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159 | CartesianProduct(const T_container& container0, |
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160 | const T_container& container1, |
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161 | const T_container& container2, |
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162 | const T_container& container3, |
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163 | const T_container& container4, |
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164 | const T_container& container5, |
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165 | const T_container& container6, |
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166 | const T_container& container7, |
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167 | const T_container& container8) |
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168 | { |
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169 | BZPRECONDITION(N_containers == 9); |
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170 | containers_[0] = &container0; |
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171 | containers_[1] = &container1; |
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172 | containers_[2] = &container2; |
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173 | containers_[3] = &container3; |
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174 | containers_[4] = &container4; |
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175 | containers_[5] = &container5; |
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176 | containers_[6] = &container6; |
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177 | containers_[7] = &container7; |
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178 | containers_[8] = &container8; |
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179 | } |
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180 | |
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181 | CartesianProduct(const T_container& container0, |
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182 | const T_container& container1, |
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183 | const T_container& container2, |
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184 | const T_container& container3, |
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185 | const T_container& container4, |
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186 | const T_container& container5, |
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187 | const T_container& container6, |
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188 | const T_container& container7, |
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189 | const T_container& container8, |
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190 | const T_container& container9) |
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191 | { |
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192 | BZPRECONDITION(N_containers == 10); |
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193 | containers_[0] = &container0; |
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194 | containers_[1] = &container1; |
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195 | containers_[2] = &container2; |
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196 | containers_[3] = &container3; |
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197 | containers_[4] = &container4; |
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198 | containers_[5] = &container5; |
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199 | containers_[6] = &container6; |
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200 | containers_[7] = &container7; |
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201 | containers_[8] = &container8; |
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202 | containers_[9] = &container9; |
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203 | } |
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204 | |
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205 | CartesianProduct(const T_container& container0, |
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206 | const T_container& container1, |
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207 | const T_container& container2, |
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208 | const T_container& container3, |
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209 | const T_container& container4, |
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210 | const T_container& container5, |
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211 | const T_container& container6, |
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212 | const T_container& container7, |
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213 | const T_container& container8, |
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214 | const T_container& container9, |
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215 | const T_container& container10) |
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216 | { |
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217 | BZPRECONDITION(N_containers == 11); |
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218 | containers_[0] = &container0; |
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219 | containers_[1] = &container1; |
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220 | containers_[2] = &container2; |
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221 | containers_[3] = &container3; |
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222 | containers_[4] = &container4; |
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223 | containers_[5] = &container5; |
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224 | containers_[6] = &container6; |
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225 | containers_[7] = &container7; |
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226 | containers_[8] = &container8; |
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227 | containers_[9] = &container9; |
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228 | containers_[10] = &container10; |
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229 | } |
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230 | |
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231 | const T_container& operator[](int i) |
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232 | { return *(containers_[i]); } |
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233 | |
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234 | void debugDump(); |
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235 | |
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236 | protected: |
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237 | const T_container* containers_[N_containers]; |
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238 | }; |
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239 | |
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240 | template<typename T_tuple, typename T_container, int N_containers> |
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241 | void CartesianProduct<T_tuple,T_container,N_containers>::debugDump() |
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242 | { |
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243 | cout << "Dump of CartesianProduct<..,..," << N_containers << ">" << endl; |
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244 | for (int i=0; i < N_containers; ++i) |
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245 | { |
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246 | cout << "Container " << (i+1) << ": "; |
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247 | _bz_typename T_container::const_iterator iter = containers_[i]->begin(), |
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248 | end = containers_[i]->end(); |
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249 | for (; iter != end; ++iter) |
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250 | cout << (*iter) << '\t'; |
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251 | } |
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252 | } |
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253 | |
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254 | template<typename T_tuple, typename T_container, int N_containers> |
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255 | class CartesianProductIterator { |
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256 | public: |
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257 | typedef _bz_typename T_container::const_iterator citerator; |
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258 | typedef CartesianProductIterator<T_tuple,T_container,N_containers> iterator; |
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259 | typedef CartesianProduct<T_tuple,T_container,N_containers> T_cp; |
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260 | |
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261 | CartesianProductIterator(T_cp& container) |
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262 | { |
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263 | for (int i=0; i < N_containers; ++i) |
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264 | { |
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265 | firstiters_[i] = container[i].begin(); |
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266 | iters_[i] = firstiters_[i]; |
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267 | enditers_[i] = container[i].end(); |
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268 | tuple_[i] = *iters_[i]; |
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269 | } |
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270 | |
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271 | endflag_ = false; |
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272 | } |
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273 | |
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274 | void operator++(); |
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275 | |
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276 | CartesianProductIterator(_cp_end_tag) |
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277 | { |
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278 | endflag_ = true; |
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279 | } |
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280 | |
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281 | bool operator==(const iterator& x) const |
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282 | { |
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283 | return (endflag_ == x.endflag_); |
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284 | } |
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285 | |
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286 | bool operator!=(const iterator& x) const |
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287 | { |
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288 | return endflag_ != x.endflag_; |
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289 | } |
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290 | |
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291 | const T_tuple& operator*() const |
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292 | { return tuple_; } |
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293 | |
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294 | protected: |
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295 | citerator iters_[N_containers]; |
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296 | citerator firstiters_[N_containers]; |
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297 | citerator enditers_[N_containers]; |
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298 | T_tuple tuple_; |
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299 | bool endflag_; |
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300 | }; |
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301 | |
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302 | template<typename T_tuple, typename T_container, int N_containers> |
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303 | void CartesianProductIterator<T_tuple, T_container, |
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304 | N_containers>::operator++() |
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305 | { |
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306 | // Usual stack-style increment |
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307 | const int Nminus1 = N_containers - 1; |
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308 | |
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309 | int i = Nminus1; |
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310 | |
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311 | // Short-circuit for most common case |
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312 | // (just increment the last iterator) |
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313 | |
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314 | if((++iters_[i]) != enditers_[i]) |
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315 | { |
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316 | tuple_[i] = *iters_[i]; |
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317 | return; |
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318 | } |
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319 | |
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320 | // Less common cases |
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321 | |
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322 | for (--i; i >= 0; --i) |
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323 | { |
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324 | ++iters_[i]; |
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325 | if (iters_[i] != enditers_[i]) |
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326 | break; |
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327 | } |
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328 | |
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329 | if (i == -1) |
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330 | { |
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331 | endflag_ = true; |
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332 | return; |
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333 | } |
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334 | |
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335 | tuple_[i] = *iters_[i]; |
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336 | |
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337 | for (++i; i < N_containers; ++i) |
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338 | { |
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339 | iters_[i] = firstiters_[i]; |
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340 | tuple_[i] = *iters_[i]; |
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341 | } |
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342 | } |
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343 | |
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344 | BZ_NAMESPACE_END |
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345 | |
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346 | #endif // BZ_ARRAY_CARTESIAN_H |
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347 | |
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