1 | /* -*- C++ -*- |
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2 | * lemon/matrix_maps.h - Part of LEMON, a generic C++ optimization library |
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3 | * |
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4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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6 | * |
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7 | * Permission to use, modify and distribute this software is granted |
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8 | * provided that this copyright notice appears in all copies. For |
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9 | * precise terms see the accompanying LICENSE file. |
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10 | * |
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11 | * This software is provided "AS IS" with no warranty of any kind, |
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12 | * express or implied, and with no claim as to its suitability for any |
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13 | * purpose. |
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14 | * |
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15 | */ |
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16 | |
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17 | #ifndef LEMON_MATRIX_MAPS_H |
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18 | #define LEMON_MATRIX_MAPS_H |
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19 | |
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20 | |
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21 | #include <vector> |
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22 | #include <lemon/utility.h> |
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23 | #include <lemon/maps.h> |
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24 | |
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25 | |
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26 | /// \file |
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27 | /// \ingroup maps |
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28 | /// \brief Maps indexed with pairs of items. |
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29 | /// |
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30 | /// \todo This file has the same name as the concept file in concept/, |
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31 | /// and this is not easily detectable in docs... |
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32 | namespace lemon { |
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33 | |
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34 | /// \brief Map for the coloumn view of the matrix |
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35 | /// |
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36 | /// Map for the coloumn view of the matrix. |
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37 | template <typename _MatrixMap> |
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38 | class MatrixRowMap : public MapTraits<_MatrixMap> { |
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39 | public: |
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40 | typedef _MatrixMap MatrixMap; |
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41 | typedef typename MatrixMap::SecondKey Key; |
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42 | typedef typename MatrixMap::Value Value; |
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43 | |
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44 | |
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45 | MatrixRowMap(MatrixMap& _matrix, typename MatrixMap::FirstKey _row) |
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46 | : matrix(_matrix), row(_row) {} |
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47 | |
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48 | /// \brief Subscription operator |
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49 | /// |
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50 | /// Subscription operator. |
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51 | typename MapTraits<MatrixMap>::ReturnValue |
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52 | operator[](Key col) { |
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53 | return matrix(row, col); |
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54 | } |
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55 | |
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56 | /// \brief Setter function |
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57 | /// |
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58 | /// Setter function. |
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59 | void set(Key col, const Value& val) { |
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60 | matrix.set(row, col, val); |
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61 | } |
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62 | |
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63 | /// \brief Subscription operator |
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64 | /// |
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65 | /// Subscription operator. |
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66 | typename MapTraits<MatrixMap>::ConstReturnValue |
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67 | operator[](Key col) const { |
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68 | return matrix(row, col); |
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69 | } |
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70 | |
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71 | private: |
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72 | MatrixMap& matrix; |
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73 | typename MatrixMap::FirstKey row; |
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74 | }; |
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75 | |
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76 | /// \brief Map for the row view of the matrix |
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77 | /// |
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78 | /// Map for the row view of the matrix. |
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79 | template <typename _MatrixMap> |
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80 | class ConstMatrixRowMap : public MapTraits<_MatrixMap> { |
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81 | public: |
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82 | typedef _MatrixMap MatrixMap; |
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83 | typedef typename MatrixMap::SecondKey Key; |
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84 | typedef typename MatrixMap::Value Value; |
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85 | |
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86 | |
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87 | ConstMatrixRowMap(const MatrixMap& _matrix, |
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88 | typename MatrixMap::FirstKey _row) |
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89 | : matrix(_matrix), row(_row) {} |
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90 | |
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91 | /// \brief Subscription operator |
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92 | /// |
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93 | /// Subscription operator. |
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94 | typename MapTraits<MatrixMap>::ConstReturnValue |
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95 | operator[](Key col) const { |
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96 | return matrix(row, col); |
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97 | } |
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98 | |
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99 | private: |
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100 | const MatrixMap& matrix; |
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101 | typename MatrixMap::FirstKey row; |
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102 | }; |
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103 | |
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104 | /// \brief Gives back a row view of the matrix map |
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105 | /// |
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106 | /// Gives back a row view of the matrix map. |
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107 | template <typename MatrixMap> |
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108 | MatrixRowMap<MatrixMap> matrixRowMap(MatrixMap& matrixMap, |
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109 | typename MatrixMap::FirstKey row) { |
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110 | return MatrixRowMap<MatrixMap>(matrixMap, row); |
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111 | } |
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112 | |
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113 | template <typename MatrixMap> |
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114 | ConstMatrixRowMap<MatrixMap> |
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115 | matrixRowMap(const MatrixMap& matrixMap, typename MatrixMap::FirstKey row) { |
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116 | return ConstMatrixRowMap<MatrixMap>(matrixMap, row); |
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117 | } |
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118 | |
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119 | /// \brief Map for the row view of the matrix |
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120 | /// |
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121 | /// Map for the row view of the matrix. |
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122 | template <typename _MatrixMap> |
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123 | class MatrixColMap : public MapTraits<_MatrixMap> { |
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124 | public: |
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125 | typedef _MatrixMap MatrixMap; |
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126 | typedef typename MatrixMap::FirstKey Key; |
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127 | typedef typename MatrixMap::Value Value; |
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128 | |
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129 | MatrixColMap(MatrixMap& _matrix, typename MatrixMap::SecondKey _col) |
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130 | : matrix(_matrix), col(_col) {} |
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131 | |
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132 | /// \brief Subscription operator |
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133 | /// |
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134 | /// Subscription operator. |
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135 | typename MapTraits<MatrixMap>::ReturnValue |
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136 | operator[](Key row) { |
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137 | return matrix(row, col); |
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138 | } |
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139 | |
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140 | /// \brief Setter function |
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141 | /// |
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142 | /// Setter function. |
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143 | void set(Key row, const Value& val) { |
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144 | matrix.set(row, col, val); |
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145 | } |
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146 | |
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147 | /// \brief Subscription operator |
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148 | /// |
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149 | /// Subscription operator. |
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150 | typename MapTraits<MatrixMap>::ConstReturnValue |
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151 | operator[](Key row) const { |
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152 | return matrix(row, col); |
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153 | } |
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154 | |
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155 | private: |
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156 | MatrixMap& matrix; |
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157 | typename MatrixMap::SecondKey col; |
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158 | }; |
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159 | |
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160 | /// \brief Map for the col view of the matrix |
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161 | /// |
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162 | /// Map for the col view of the matrix. |
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163 | template <typename _MatrixMap> |
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164 | class ConstMatrixColMap : public MapTraits<_MatrixMap> { |
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165 | public: |
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166 | typedef _MatrixMap MatrixMap; |
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167 | typedef typename MatrixMap::FirstKey Key; |
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168 | typedef typename MatrixMap::Value Value; |
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169 | |
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170 | ConstMatrixColMap(const MatrixMap& _matrix, |
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171 | typename MatrixMap::SecondKey _col) |
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172 | : matrix(_matrix), col(_col) {} |
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173 | |
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174 | /// \brief Subscription operator |
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175 | /// |
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176 | /// Subscription operator. |
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177 | typename MapTraits<MatrixMap>::ConstReturnValue |
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178 | operator[](Key row) const { |
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179 | return matrix(row, col); |
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180 | } |
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181 | |
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182 | private: |
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183 | const MatrixMap& matrix; |
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184 | typename MatrixMap::SecondKey col; |
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185 | }; |
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186 | |
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187 | /// \brief Gives back a col view of the matrix map |
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188 | /// |
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189 | /// Gives back a col view of the matrix map. |
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190 | template <typename MatrixMap> |
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191 | MatrixColMap<MatrixMap> matrixColMap(MatrixMap& matrixMap, |
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192 | typename MatrixMap::SecondKey col) { |
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193 | return MatrixColMap<MatrixMap>(matrixMap, col); |
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194 | } |
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195 | |
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196 | template <typename MatrixMap> |
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197 | ConstMatrixColMap<MatrixMap> |
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198 | matrixColMap(const MatrixMap& matrixMap, typename MatrixMap::SecondKey col) { |
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199 | return ConstMatrixColMap<MatrixMap>(matrixMap, col); |
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200 | } |
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201 | |
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202 | /// \brief Container for store values for each ordered pair of graph items |
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203 | /// |
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204 | /// This data structure can strore for each pairs of the same item |
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205 | /// type a value. It increase the size of the container when the |
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206 | /// associated graph modified, so it updated automaticly whenever |
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207 | /// it is needed. |
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208 | template <typename _Graph, typename _Item, typename _Value> |
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209 | class DynamicMatrixMap |
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210 | : protected AlterationNotifier<_Item>::ObserverBase { |
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211 | public: |
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212 | typedef typename AlterationNotifier<_Item>::ObserverBase Parent; |
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213 | |
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214 | typedef _Graph Graph; |
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215 | typedef _Item Key; |
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216 | |
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217 | typedef _Item FirstKey; |
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218 | typedef _Item SecondKey; |
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219 | typedef _Value Value; |
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220 | |
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221 | typedef True ReferenceMapTag; |
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222 | |
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223 | private: |
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224 | |
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225 | typedef std::vector<Value> Container; |
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226 | |
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227 | public: |
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228 | |
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229 | typedef typename Container::reference Reference; |
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230 | typedef typename Container::const_reference ConstReference; |
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231 | |
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232 | /// \brief Creates an item matrix for the given graph |
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233 | /// |
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234 | /// Creates an item matrix for the given graph. |
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235 | DynamicMatrixMap(const Graph& _graph) |
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236 | : graph(_graph), values(size(_graph.maxId(Key()) + 1)) { |
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237 | Parent::attach(graph.getNotifier(Key())); |
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238 | } |
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239 | |
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240 | /// \brief Creates an item matrix for the given graph |
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241 | /// |
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242 | /// Creates an item matrix for the given graph and assigns for each |
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243 | /// pairs of keys the given parameter. |
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244 | DynamicMatrixMap(const Graph& _graph, const Value& _val) |
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245 | : graph(_graph), values(size(_graph.maxId(Key()) + 1), _val) { |
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246 | Parent::attach(graph.getNotifier(Key())); |
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247 | } |
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248 | |
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249 | ~DynamicMatrixMap() { |
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250 | if (Parent::attached()) { |
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251 | Parent::detach(); |
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252 | } |
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253 | } |
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254 | |
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255 | /// \brief Gives back the value assigned to the \c first - \c second |
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256 | /// ordered pair. |
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257 | /// |
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258 | /// Gives back the value assigned to the \c first - \c second ordered pair. |
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259 | ConstReference operator()(const Key& first, const Key& second) const { |
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260 | return values[index(graph.id(first), graph.id(second))]; |
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261 | } |
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262 | |
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263 | /// \brief Gives back the value assigned to the \c first - \c second |
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264 | /// ordered pair. |
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265 | /// |
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266 | /// Gives back the value assigned to the \c first - \c second ordered pair. |
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267 | Reference operator()(const Key& first, const Key& second) { |
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268 | return values[index(graph.id(first), graph.id(second))]; |
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269 | } |
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270 | |
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271 | /// \brief Setter function for the matrix map. |
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272 | /// |
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273 | /// Setter function for the matrix map. |
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274 | void set(const Key& first, const Key& second, const Value& val) { |
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275 | values[index(graph.id(first), graph.id(second))] = val; |
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276 | } |
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277 | |
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278 | protected: |
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279 | |
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280 | static int index(int i, int j) { |
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281 | if (i < j) { |
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282 | return j * j + i; |
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283 | } else { |
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284 | return i * i + i + j; |
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285 | } |
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286 | } |
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287 | |
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288 | static int size(int s) { |
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289 | return s * s; |
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290 | } |
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291 | |
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292 | virtual void add(const Key& key) { |
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293 | if (size(graph.id(key) + 1) >= (int)values.size()) { |
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294 | values.resize(size(graph.id(key) + 1)); |
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295 | } |
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296 | } |
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297 | |
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298 | virtual void erase(const Key&) {} |
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299 | |
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300 | virtual void build() { |
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301 | values.resize(size(graph.maxId(Key()) + 1)); |
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302 | } |
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303 | |
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304 | virtual void clear() { |
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305 | values.clear(); |
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306 | } |
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307 | |
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308 | private: |
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309 | const Graph& graph; |
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310 | std::vector<Value> values; |
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311 | }; |
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312 | |
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313 | /// \brief Container for store values for each unordered pair of graph items |
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314 | /// |
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315 | /// This data structure can strore for each pairs of the same item |
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316 | /// type a value. It increase the size of the container when the |
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317 | /// associated graph modified, so it updated automaticly whenever |
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318 | /// it is needed. |
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319 | template <typename _Graph, typename _Item, typename _Value> |
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320 | class DynamicSymMatrixMap |
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321 | : protected AlterationNotifier<_Item>::ObserverBase { |
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322 | public: |
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323 | typedef typename AlterationNotifier<_Item>::ObserverBase Parent; |
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324 | |
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325 | typedef _Graph Graph; |
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326 | typedef _Item Key; |
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327 | |
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328 | typedef _Item FirstKey; |
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329 | typedef _Item SecondKey; |
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330 | typedef _Value Value; |
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331 | |
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332 | typedef True ReferenceMapTag; |
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333 | |
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334 | private: |
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335 | |
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336 | typedef std::vector<Value> Container; |
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337 | |
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338 | public: |
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339 | |
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340 | typedef typename Container::reference Reference; |
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341 | typedef typename Container::const_reference ConstReference; |
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342 | |
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343 | /// \brief Creates an item matrix for the given graph |
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344 | /// |
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345 | /// Creates an item matrix for the given graph. |
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346 | DynamicSymMatrixMap(const Graph& _graph) |
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347 | : graph(_graph), values(size(_graph.maxId(Key()) + 1)) { |
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348 | Parent::attach(graph.getNotifier(Key())); |
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349 | } |
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350 | |
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351 | /// \brief Creates an item matrix for the given graph |
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352 | /// |
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353 | /// Creates an item matrix for the given graph and assigns for each |
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354 | /// pairs of keys the given parameter. |
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355 | DynamicSymMatrixMap(const Graph& _graph, const Value& _val) |
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356 | : graph(_graph), values(size(_graph.maxId(Key()) + 1), _val) { |
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357 | Parent::attach(graph.getNotifier(Key())); |
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358 | } |
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359 | |
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360 | ~DynamicSymMatrixMap() { |
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361 | if (Parent::attached()) { |
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362 | Parent::detach(); |
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363 | } |
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364 | } |
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365 | |
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366 | /// \brief Gives back the value assigned to the \c first - \c second |
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367 | /// unordered pair. |
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368 | /// |
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369 | /// Gives back the value assigned to the \c first - \c second unordered |
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370 | /// pair. |
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371 | ConstReference operator()(const Key& first, const Key& second) const { |
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372 | return values[index(graph.id(first), graph.id(second))]; |
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373 | } |
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374 | |
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375 | /// \brief Gives back the value assigned to the \c first - \c second |
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376 | /// unordered pair. |
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377 | /// |
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378 | /// Gives back the value assigned to the \c first - \c second unordered |
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379 | /// pair. |
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380 | Reference operator()(const Key& first, const Key& second) { |
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381 | return values[index(graph.id(first), graph.id(second))]; |
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382 | } |
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383 | |
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384 | /// \brief Setter function for the matrix map. |
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385 | /// |
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386 | /// Setter function for the matrix map. |
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387 | void set(const Key& first, const Key& second, const Value& val) { |
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388 | values[index(graph.id(first), graph.id(second))] = val; |
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389 | } |
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390 | |
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391 | protected: |
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392 | |
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393 | static int index(int i, int j) { |
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394 | if (i < j) { |
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395 | return j * (j + 1) / 2 + i; |
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396 | } else { |
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397 | return i * (i + 1) / 2 + j; |
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398 | } |
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399 | } |
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400 | |
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401 | static int size(int s) { |
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402 | return s * (s + 1) / 2; |
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403 | } |
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404 | |
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405 | virtual void add(const Key& key) { |
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406 | if (size(graph.id(key) + 1) >= (int)values.size()) { |
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407 | values.resize(size(graph.id(key) + 1)); |
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408 | } |
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409 | } |
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410 | |
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411 | virtual void erase(const Key&) {} |
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412 | |
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413 | virtual void build() { |
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414 | values.resize(size(graph.maxId(Key()) + 1)); |
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415 | } |
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416 | |
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417 | virtual void clear() { |
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418 | values.clear(); |
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419 | } |
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420 | |
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421 | private: |
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422 | const Graph& graph; |
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423 | std::vector<Value> values; |
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424 | }; |
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425 | |
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426 | } |
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427 | |
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428 | #endif |
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