1 | /* -*- C++ -*- |
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2 | * |
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3 | * This file is a part of LEMON, a generic C++ optimization library |
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4 | * |
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5 | * Copyright (C) 2003-2006 |
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6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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8 | * |
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9 | * Permission to use, modify and distribute this software is granted |
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10 | * provided that this copyright notice appears in all copies. For |
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11 | * precise terms see the accompanying LICENSE file. |
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12 | * |
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13 | * This software is provided "AS IS" with no warranty of any kind, |
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14 | * express or implied, and with no claim as to its suitability for any |
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15 | * purpose. |
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16 | * |
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17 | */ |
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18 | |
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19 | #ifndef LEMON_BITS_PRED_MAP_PATH_H |
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20 | #define LEMON_BITS_PRED_MAP_PATH_H |
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21 | |
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22 | namespace lemon { |
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23 | |
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24 | template <typename _Graph, typename _PredMap> |
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25 | class PredMapPath { |
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26 | public: |
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27 | typedef True RevPathTag; |
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28 | |
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29 | typedef _Graph Graph; |
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30 | typedef typename Graph::Edge Edge; |
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31 | typedef _PredMap PredMap; |
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32 | |
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33 | PredMapPath(const Graph& _graph, const PredMap& _predMap, |
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34 | typename Graph::Node _target) |
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35 | : graph(_graph), predMap(_predMap), target(_target) {} |
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36 | |
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37 | int length() const { |
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38 | int len = 0; |
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39 | typename Graph::Node node = target; |
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40 | typename Graph::Edge edge; |
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41 | while ((edge = predMap[node]) != INVALID) { |
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42 | node = graph.source(edge); |
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43 | ++len; |
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44 | } |
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45 | return len; |
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46 | } |
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47 | |
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48 | bool empty() const { |
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49 | return predMap[target] != INVALID; |
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50 | } |
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51 | |
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52 | class RevIt { |
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53 | public: |
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54 | RevIt() {} |
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55 | RevIt(Invalid) : path(0), current(INVALID) {} |
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56 | RevIt(const PredMapPath& _path) |
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57 | : path(&_path), current(_path.target) {} |
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58 | |
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59 | operator const typename Graph::Edge() const { |
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60 | return path->predMap[current]; |
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61 | } |
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62 | |
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63 | RevIt& operator++() { |
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64 | current = path->graph.source(path->predMap[current]); |
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65 | if (path->predMap[current] == INVALID) current = INVALID; |
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66 | return *this; |
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67 | } |
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68 | |
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69 | bool operator==(const RevIt& e) const { |
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70 | return current == e.current; |
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71 | } |
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72 | |
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73 | bool operator!=(const RevIt& e) const { |
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74 | return current != e.current; |
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75 | } |
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76 | |
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77 | bool operator<(const RevIt& e) const { |
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78 | return current < e.current; |
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79 | } |
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80 | |
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81 | private: |
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82 | const PredMapPath* path; |
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83 | typename Graph::Node current; |
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84 | }; |
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85 | |
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86 | private: |
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87 | const Graph& graph; |
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88 | const PredMap& predMap; |
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89 | typename Graph::Node target; |
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90 | }; |
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91 | |
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92 | |
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93 | template <typename _Graph, typename _PredMatrixMap> |
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94 | class PredMatrixMapPath { |
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95 | public: |
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96 | typedef True RevPathTag; |
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97 | |
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98 | typedef _Graph Graph; |
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99 | typedef typename Graph::Edge Edge; |
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100 | typedef _PredMatrixMap PredMatrixMap; |
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101 | |
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102 | PredMatrixMapPath(const Graph& _graph, |
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103 | const PredMatrixMap& _predMatrixMap, |
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104 | typename Graph::Node _source, |
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105 | typename Graph::Node _target) |
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106 | : graph(_graph), predMatrixMap(_predMatrixMap), |
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107 | source(_source), target(_target) {} |
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108 | |
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109 | int length() const { |
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110 | int len = 0; |
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111 | typename Graph::Node node = target; |
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112 | typename Graph::Edge edge; |
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113 | while ((edge = predMatrixMap(source, node)) != INVALID) { |
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114 | node = graph.source(edge); |
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115 | ++len; |
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116 | } |
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117 | return len; |
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118 | } |
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119 | |
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120 | bool empty() const { |
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121 | return source != target; |
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122 | } |
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123 | |
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124 | class RevIt { |
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125 | public: |
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126 | RevIt() {} |
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127 | RevIt(Invalid) : path(0), current(INVALID) {} |
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128 | RevIt(const PredMatrixMapPath& _path) |
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129 | : path(&_path), current(_path.target) {} |
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130 | |
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131 | operator const typename Graph::Edge() const { |
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132 | return path->predMatrixMap(path->source, current); |
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133 | } |
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134 | |
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135 | RevIt& operator++() { |
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136 | current = |
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137 | path->graph.source(path->predMatrixMap(path->source, current)); |
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138 | if (path->predMatrixMap(path->source, current) == INVALID) |
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139 | current = INVALID; |
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140 | return *this; |
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141 | } |
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142 | |
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143 | bool operator==(const RevIt& e) const { |
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144 | return current == e.current; |
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145 | } |
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146 | |
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147 | bool operator!=(const RevIt& e) const { |
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148 | return current != e.current; |
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149 | } |
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150 | |
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151 | bool operator<(const RevIt& e) const { |
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152 | return current < e.current; |
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153 | } |
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154 | |
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155 | private: |
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156 | const PredMatrixMapPath* path; |
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157 | typename Graph::Node current; |
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158 | }; |
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159 | |
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160 | private: |
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161 | const Graph& graph; |
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162 | const PredMatrixMap& predMatrixMap; |
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163 | typename Graph::Node source; |
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164 | typename Graph::Node target; |
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165 | }; |
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166 | |
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167 | } |
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168 | |
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169 | #endif |
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