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) 2003-2008 |
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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_BASE_EXTENDER_H |
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20 | #define LEMON_BITS_BASE_EXTENDER_H |
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21 | |
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22 | #include <lemon/bits/invalid.h> |
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23 | #include <lemon/error.h> |
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24 | |
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25 | #include <lemon/bits/map_extender.h> |
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26 | #include <lemon/bits/default_map.h> |
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27 | |
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28 | #include <lemon/concept_check.h> |
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29 | #include <lemon/concepts/maps.h> |
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30 | |
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31 | ///\ingroup digraphbits |
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32 | ///\file |
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33 | ///\brief Extenders for the digraph types |
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34 | namespace lemon { |
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35 | |
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36 | /// \ingroup digraphbits |
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37 | /// |
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38 | /// \brief BaseDigraph to BaseGraph extender |
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39 | template <typename Base> |
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40 | class UndirDigraphExtender : public Base { |
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41 | |
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42 | public: |
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43 | |
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44 | typedef Base Parent; |
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45 | typedef typename Parent::Arc Edge; |
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46 | typedef typename Parent::Node Node; |
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47 | |
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48 | typedef True UndirectedTag; |
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49 | |
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50 | class Arc : public Edge { |
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51 | friend class UndirDigraphExtender; |
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52 | |
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53 | protected: |
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54 | bool forward; |
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55 | |
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56 | Arc(const Edge &ue, bool _forward) : |
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57 | Edge(ue), forward(_forward) {} |
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58 | |
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59 | public: |
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60 | Arc() {} |
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61 | |
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62 | /// Invalid arc constructor |
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63 | Arc(Invalid i) : Edge(i), forward(true) {} |
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64 | |
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65 | bool operator==(const Arc &that) const { |
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66 | return forward==that.forward && Edge(*this)==Edge(that); |
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67 | } |
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68 | bool operator!=(const Arc &that) const { |
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69 | return forward!=that.forward || Edge(*this)!=Edge(that); |
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70 | } |
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71 | bool operator<(const Arc &that) const { |
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72 | return forward<that.forward || |
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73 | (!(that.forward<forward) && Edge(*this)<Edge(that)); |
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74 | } |
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75 | }; |
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76 | |
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77 | |
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78 | |
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79 | using Parent::source; |
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80 | |
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81 | /// Source of the given Arc. |
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82 | Node source(const Arc &e) const { |
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83 | return e.forward ? Parent::source(e) : Parent::target(e); |
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84 | } |
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85 | |
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86 | using Parent::target; |
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87 | |
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88 | /// Target of the given Arc. |
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89 | Node target(const Arc &e) const { |
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90 | return e.forward ? Parent::target(e) : Parent::source(e); |
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91 | } |
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92 | |
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93 | /// \brief Directed arc from an edge. |
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94 | /// |
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95 | /// Returns a directed arc corresponding to the specified Edge. |
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96 | /// If the given bool is true the given edge and the |
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97 | /// returned arc have the same source node. |
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98 | static Arc direct(const Edge &ue, bool d) { |
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99 | return Arc(ue, d); |
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100 | } |
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101 | |
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102 | /// Returns whether the given directed arc is same orientation as the |
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103 | /// corresponding edge. |
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104 | /// |
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105 | /// \todo reference to the corresponding point of the undirected digraph |
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106 | /// concept. "What does the direction of an edge mean?" |
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107 | static bool direction(const Arc &e) { return e.forward; } |
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108 | |
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109 | |
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110 | using Parent::first; |
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111 | using Parent::next; |
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112 | |
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113 | void first(Arc &e) const { |
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114 | Parent::first(e); |
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115 | e.forward=true; |
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116 | } |
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117 | |
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118 | void next(Arc &e) const { |
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119 | if( e.forward ) { |
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120 | e.forward = false; |
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121 | } |
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122 | else { |
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123 | Parent::next(e); |
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124 | e.forward = true; |
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125 | } |
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126 | } |
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127 | |
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128 | void firstOut(Arc &e, const Node &n) const { |
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129 | Parent::firstIn(e,n); |
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130 | if( Edge(e) != INVALID ) { |
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131 | e.forward = false; |
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132 | } |
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133 | else { |
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134 | Parent::firstOut(e,n); |
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135 | e.forward = true; |
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136 | } |
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137 | } |
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138 | void nextOut(Arc &e) const { |
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139 | if( ! e.forward ) { |
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140 | Node n = Parent::target(e); |
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141 | Parent::nextIn(e); |
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142 | if( Edge(e) == INVALID ) { |
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143 | Parent::firstOut(e, n); |
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144 | e.forward = true; |
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145 | } |
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146 | } |
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147 | else { |
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148 | Parent::nextOut(e); |
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149 | } |
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150 | } |
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151 | |
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152 | void firstIn(Arc &e, const Node &n) const { |
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153 | Parent::firstOut(e,n); |
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154 | if( Edge(e) != INVALID ) { |
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155 | e.forward = false; |
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156 | } |
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157 | else { |
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158 | Parent::firstIn(e,n); |
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159 | e.forward = true; |
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160 | } |
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161 | } |
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162 | void nextIn(Arc &e) const { |
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163 | if( ! e.forward ) { |
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164 | Node n = Parent::source(e); |
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165 | Parent::nextOut(e); |
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166 | if( Edge(e) == INVALID ) { |
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167 | Parent::firstIn(e, n); |
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168 | e.forward = true; |
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169 | } |
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170 | } |
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171 | else { |
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172 | Parent::nextIn(e); |
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173 | } |
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174 | } |
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175 | |
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176 | void firstInc(Edge &e, bool &d, const Node &n) const { |
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177 | d = true; |
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178 | Parent::firstOut(e, n); |
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179 | if (e != INVALID) return; |
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180 | d = false; |
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181 | Parent::firstIn(e, n); |
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182 | } |
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183 | |
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184 | void nextInc(Edge &e, bool &d) const { |
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185 | if (d) { |
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186 | Node s = Parent::source(e); |
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187 | Parent::nextOut(e); |
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188 | if (e != INVALID) return; |
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189 | d = false; |
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190 | Parent::firstIn(e, s); |
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191 | } else { |
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192 | Parent::nextIn(e); |
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193 | } |
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194 | } |
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195 | |
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196 | Node nodeFromId(int ix) const { |
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197 | return Parent::nodeFromId(ix); |
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198 | } |
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199 | |
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200 | Arc arcFromId(int ix) const { |
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201 | return direct(Parent::arcFromId(ix >> 1), bool(ix & 1)); |
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202 | } |
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203 | |
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204 | Edge edgeFromId(int ix) const { |
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205 | return Parent::arcFromId(ix); |
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206 | } |
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207 | |
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208 | int id(const Node &n) const { |
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209 | return Parent::id(n); |
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210 | } |
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211 | |
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212 | int id(const Edge &e) const { |
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213 | return Parent::id(e); |
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214 | } |
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215 | |
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216 | int id(const Arc &e) const { |
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217 | return 2 * Parent::id(e) + int(e.forward); |
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218 | } |
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219 | |
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220 | int maxNodeId() const { |
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221 | return Parent::maxNodeId(); |
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222 | } |
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223 | |
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224 | int maxArcId() const { |
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225 | return 2 * Parent::maxArcId() + 1; |
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226 | } |
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227 | |
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228 | int maxEdgeId() const { |
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229 | return Parent::maxArcId(); |
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230 | } |
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231 | |
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232 | |
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233 | int arcNum() const { |
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234 | return 2 * Parent::arcNum(); |
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235 | } |
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236 | |
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237 | int edgeNum() const { |
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238 | return Parent::arcNum(); |
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239 | } |
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240 | |
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241 | Arc findArc(Node s, Node t, Arc p = INVALID) const { |
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242 | if (p == INVALID) { |
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243 | Edge arc = Parent::findArc(s, t); |
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244 | if (arc != INVALID) return direct(arc, true); |
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245 | arc = Parent::findArc(t, s); |
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246 | if (arc != INVALID) return direct(arc, false); |
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247 | } else if (direction(p)) { |
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248 | Edge arc = Parent::findArc(s, t, p); |
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249 | if (arc != INVALID) return direct(arc, true); |
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250 | arc = Parent::findArc(t, s); |
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251 | if (arc != INVALID) return direct(arc, false); |
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252 | } else { |
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253 | Edge arc = Parent::findArc(t, s, p); |
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254 | if (arc != INVALID) return direct(arc, false); |
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255 | } |
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256 | return INVALID; |
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257 | } |
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258 | |
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259 | Edge findEdge(Node s, Node t, Edge p = INVALID) const { |
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260 | if (s != t) { |
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261 | if (p == INVALID) { |
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262 | Edge arc = Parent::findArc(s, t); |
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263 | if (arc != INVALID) return arc; |
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264 | arc = Parent::findArc(t, s); |
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265 | if (arc != INVALID) return arc; |
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266 | } else if (Parent::s(p) == s) { |
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267 | Edge arc = Parent::findArc(s, t, p); |
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268 | if (arc != INVALID) return arc; |
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269 | arc = Parent::findArc(t, s); |
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270 | if (arc != INVALID) return arc; |
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271 | } else { |
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272 | Edge arc = Parent::findArc(t, s, p); |
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273 | if (arc != INVALID) return arc; |
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274 | } |
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275 | } else { |
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276 | return Parent::findArc(s, t, p); |
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277 | } |
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278 | return INVALID; |
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279 | } |
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280 | }; |
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281 | |
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282 | template <typename Base> |
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283 | class BidirBpGraphExtender : public Base { |
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284 | public: |
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285 | typedef Base Parent; |
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286 | typedef BidirBpGraphExtender Digraph; |
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287 | |
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288 | typedef typename Parent::Node Node; |
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289 | typedef typename Parent::Edge Edge; |
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290 | |
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291 | |
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292 | using Parent::first; |
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293 | using Parent::next; |
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294 | |
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295 | using Parent::id; |
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296 | |
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297 | class Red : public Node { |
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298 | friend class BidirBpGraphExtender; |
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299 | public: |
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300 | Red() {} |
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301 | Red(const Node& node) : Node(node) { |
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302 | LEMON_ASSERT(Parent::red(node) || node == INVALID, |
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303 | typename Parent::NodeSetError()); |
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304 | } |
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305 | Red& operator=(const Node& node) { |
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306 | LEMON_ASSERT(Parent::red(node) || node == INVALID, |
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307 | typename Parent::NodeSetError()); |
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308 | Node::operator=(node); |
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309 | return *this; |
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310 | } |
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311 | Red(Invalid) : Node(INVALID) {} |
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312 | Red& operator=(Invalid) { |
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313 | Node::operator=(INVALID); |
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314 | return *this; |
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315 | } |
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316 | }; |
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317 | |
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318 | void first(Red& node) const { |
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319 | Parent::firstRed(static_cast<Node&>(node)); |
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320 | } |
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321 | void next(Red& node) const { |
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322 | Parent::nextRed(static_cast<Node&>(node)); |
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323 | } |
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324 | |
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325 | int id(const Red& node) const { |
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326 | return Parent::redId(node); |
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327 | } |
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328 | |
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329 | class Blue : public Node { |
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330 | friend class BidirBpGraphExtender; |
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331 | public: |
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332 | Blue() {} |
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333 | Blue(const Node& node) : Node(node) { |
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334 | LEMON_ASSERT(Parent::blue(node) || node == INVALID, |
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335 | typename Parent::NodeSetError()); |
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336 | } |
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337 | Blue& operator=(const Node& node) { |
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338 | LEMON_ASSERT(Parent::blue(node) || node == INVALID, |
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339 | typename Parent::NodeSetError()); |
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340 | Node::operator=(node); |
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341 | return *this; |
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342 | } |
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343 | Blue(Invalid) : Node(INVALID) {} |
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344 | Blue& operator=(Invalid) { |
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345 | Node::operator=(INVALID); |
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346 | return *this; |
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347 | } |
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348 | }; |
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349 | |
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350 | void first(Blue& node) const { |
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351 | Parent::firstBlue(static_cast<Node&>(node)); |
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352 | } |
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353 | void next(Blue& node) const { |
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354 | Parent::nextBlue(static_cast<Node&>(node)); |
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355 | } |
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356 | |
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357 | int id(const Blue& node) const { |
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358 | return Parent::redId(node); |
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359 | } |
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360 | |
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361 | Node source(const Edge& arc) const { |
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362 | return red(arc); |
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363 | } |
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364 | Node target(const Edge& arc) const { |
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365 | return blue(arc); |
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366 | } |
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367 | |
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368 | void firstInc(Edge& arc, bool& dir, const Node& node) const { |
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369 | if (Parent::red(node)) { |
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370 | Parent::firstFromRed(arc, node); |
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371 | dir = true; |
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372 | } else { |
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373 | Parent::firstFromBlue(arc, node); |
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374 | dir = static_cast<Edge&>(arc) == INVALID; |
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375 | } |
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376 | } |
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377 | void nextInc(Edge& arc, bool& dir) const { |
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378 | if (dir) { |
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379 | Parent::nextFromRed(arc); |
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380 | } else { |
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381 | Parent::nextFromBlue(arc); |
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382 | if (arc == INVALID) dir = true; |
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383 | } |
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384 | } |
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385 | |
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386 | class Arc : public Edge { |
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387 | friend class BidirBpGraphExtender; |
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388 | protected: |
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389 | bool forward; |
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390 | |
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391 | Arc(const Edge& arc, bool _forward) |
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392 | : Edge(arc), forward(_forward) {} |
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393 | |
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394 | public: |
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395 | Arc() {} |
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396 | Arc (Invalid) : Edge(INVALID), forward(true) {} |
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397 | bool operator==(const Arc& i) const { |
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398 | return Edge::operator==(i) && forward == i.forward; |
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399 | } |
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400 | bool operator!=(const Arc& i) const { |
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401 | return Edge::operator!=(i) || forward != i.forward; |
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402 | } |
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403 | bool operator<(const Arc& i) const { |
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404 | return Edge::operator<(i) || |
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405 | (!(i.forward<forward) && Edge(*this)<Edge(i)); |
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406 | } |
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407 | }; |
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408 | |
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409 | void first(Arc& arc) const { |
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410 | Parent::first(static_cast<Edge&>(arc)); |
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411 | arc.forward = true; |
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412 | } |
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413 | |
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414 | void next(Arc& arc) const { |
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415 | if (!arc.forward) { |
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416 | Parent::next(static_cast<Edge&>(arc)); |
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417 | } |
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418 | arc.forward = !arc.forward; |
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419 | } |
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420 | |
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421 | void firstOut(Arc& arc, const Node& node) const { |
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422 | if (Parent::red(node)) { |
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423 | Parent::firstFromRed(arc, node); |
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424 | arc.forward = true; |
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425 | } else { |
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426 | Parent::firstFromBlue(arc, node); |
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427 | arc.forward = static_cast<Edge&>(arc) == INVALID; |
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428 | } |
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429 | } |
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430 | void nextOut(Arc& arc) const { |
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431 | if (arc.forward) { |
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432 | Parent::nextFromRed(arc); |
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433 | } else { |
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434 | Parent::nextFromBlue(arc); |
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435 | arc.forward = static_cast<Edge&>(arc) == INVALID; |
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436 | } |
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437 | } |
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438 | |
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439 | void firstIn(Arc& arc, const Node& node) const { |
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440 | if (Parent::blue(node)) { |
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441 | Parent::firstFromBlue(arc, node); |
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442 | arc.forward = true; |
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443 | } else { |
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444 | Parent::firstFromRed(arc, node); |
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445 | arc.forward = static_cast<Edge&>(arc) == INVALID; |
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446 | } |
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447 | } |
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448 | void nextIn(Arc& arc) const { |
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449 | if (arc.forward) { |
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450 | Parent::nextFromBlue(arc); |
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451 | } else { |
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452 | Parent::nextFromRed(arc); |
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453 | arc.forward = static_cast<Edge&>(arc) == INVALID; |
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454 | } |
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455 | } |
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456 | |
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457 | Node source(const Arc& arc) const { |
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458 | return arc.forward ? Parent::red(arc) : Parent::blue(arc); |
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459 | } |
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460 | Node target(const Arc& arc) const { |
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461 | return arc.forward ? Parent::blue(arc) : Parent::red(arc); |
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462 | } |
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463 | |
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464 | int id(const Arc& arc) const { |
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465 | return (Parent::id(static_cast<const Edge&>(arc)) << 1) + |
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466 | (arc.forward ? 0 : 1); |
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467 | } |
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468 | Arc arcFromId(int ix) const { |
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469 | return Arc(Parent::fromEdgeId(ix >> 1), (ix & 1) == 0); |
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470 | } |
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471 | int maxArcId() const { |
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472 | return (Parent::maxEdgeId() << 1) + 1; |
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473 | } |
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474 | |
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475 | bool direction(const Arc& arc) const { |
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476 | return arc.forward; |
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477 | } |
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478 | |
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479 | Arc direct(const Edge& arc, bool dir) const { |
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480 | return Arc(arc, dir); |
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481 | } |
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482 | |
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483 | int arcNum() const { |
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484 | return 2 * Parent::edgeNum(); |
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485 | } |
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486 | |
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487 | int edgeNum() const { |
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488 | return Parent::edgeNum(); |
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489 | } |
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490 | |
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491 | |
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492 | }; |
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493 | } |
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494 | |
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495 | #endif |
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