1 | /* -*- mode: C++; indent-tabs-mode: nil; -*- |
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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) 2003-2008 |
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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 _Digraph, 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 _Digraph Digraph; |
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30 | typedef typename Digraph::Arc Arc; |
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31 | typedef _PredMap PredMap; |
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32 | |
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33 | PredMapPath(const Digraph& _digraph, const PredMap& _predMap, |
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34 | typename Digraph::Node _target) |
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35 | : digraph(_digraph), 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 Digraph::Node node = target; |
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40 | typename Digraph::Arc arc; |
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41 | while ((arc = predMap[node]) != INVALID) { |
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42 | node = digraph.source(arc); |
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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 RevArcIt { |
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53 | public: |
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54 | RevArcIt() {} |
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55 | RevArcIt(Invalid) : path(0), current(INVALID) {} |
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56 | RevArcIt(const PredMapPath& _path) |
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57 | : path(&_path), current(_path.target) { |
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58 | if (path->predMap[current] == INVALID) current = INVALID; |
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59 | } |
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60 | |
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61 | operator const typename Digraph::Arc() const { |
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62 | return path->predMap[current]; |
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63 | } |
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64 | |
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65 | RevArcIt& operator++() { |
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66 | current = path->digraph.source(path->predMap[current]); |
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67 | if (path->predMap[current] == INVALID) current = INVALID; |
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68 | return *this; |
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69 | } |
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70 | |
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71 | bool operator==(const RevArcIt& e) const { |
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72 | return current == e.current; |
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73 | } |
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74 | |
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75 | bool operator!=(const RevArcIt& e) const { |
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76 | return current != e.current; |
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77 | } |
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78 | |
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79 | bool operator<(const RevArcIt& e) const { |
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80 | return current < e.current; |
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81 | } |
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82 | |
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83 | private: |
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84 | const PredMapPath* path; |
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85 | typename Digraph::Node current; |
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86 | }; |
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87 | |
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88 | private: |
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89 | const Digraph& digraph; |
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90 | const PredMap& predMap; |
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91 | typename Digraph::Node target; |
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92 | }; |
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93 | |
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94 | |
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95 | template <typename _Digraph, typename _PredMatrixMap> |
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96 | class PredMatrixMapPath { |
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97 | public: |
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98 | typedef True RevPathTag; |
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99 | |
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100 | typedef _Digraph Digraph; |
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101 | typedef typename Digraph::Arc Arc; |
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102 | typedef _PredMatrixMap PredMatrixMap; |
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103 | |
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104 | PredMatrixMapPath(const Digraph& _digraph, |
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105 | const PredMatrixMap& _predMatrixMap, |
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106 | typename Digraph::Node _source, |
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107 | typename Digraph::Node _target) |
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108 | : digraph(_digraph), predMatrixMap(_predMatrixMap), |
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109 | source(_source), target(_target) {} |
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110 | |
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111 | int length() const { |
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112 | int len = 0; |
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113 | typename Digraph::Node node = target; |
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114 | typename Digraph::Arc arc; |
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115 | while ((arc = predMatrixMap(source, node)) != INVALID) { |
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116 | node = digraph.source(arc); |
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117 | ++len; |
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118 | } |
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119 | return len; |
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120 | } |
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121 | |
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122 | bool empty() const { |
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123 | return source != target; |
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124 | } |
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125 | |
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126 | class RevArcIt { |
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127 | public: |
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128 | RevArcIt() {} |
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129 | RevArcIt(Invalid) : path(0), current(INVALID) {} |
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130 | RevArcIt(const PredMatrixMapPath& _path) |
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131 | : path(&_path), current(_path.target) { |
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132 | if (path->predMatrixMap(path->source, current) == INVALID) |
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133 | current = INVALID; |
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134 | } |
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135 | |
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136 | operator const typename Digraph::Arc() const { |
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137 | return path->predMatrixMap(path->source, current); |
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138 | } |
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139 | |
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140 | RevArcIt& operator++() { |
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141 | current = |
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142 | path->digraph.source(path->predMatrixMap(path->source, current)); |
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143 | if (path->predMatrixMap(path->source, current) == INVALID) |
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144 | current = INVALID; |
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145 | return *this; |
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146 | } |
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147 | |
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148 | bool operator==(const RevArcIt& e) const { |
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149 | return current == e.current; |
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150 | } |
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151 | |
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152 | bool operator!=(const RevArcIt& e) const { |
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153 | return current != e.current; |
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154 | } |
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155 | |
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156 | bool operator<(const RevArcIt& e) const { |
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157 | return current < e.current; |
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158 | } |
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159 | |
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160 | private: |
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161 | const PredMatrixMapPath* path; |
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162 | typename Digraph::Node current; |
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163 | }; |
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164 | |
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165 | private: |
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166 | const Digraph& digraph; |
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167 | const PredMatrixMap& predMatrixMap; |
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168 | typename Digraph::Node source; |
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169 | typename Digraph::Node target; |
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170 | }; |
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171 | |
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172 | } |
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173 | |
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174 | #endif |
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