1 | /* -*- C++ -*- |
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2 | * |
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3 | * src/lemon/concept/undir_graph_component.h - Part of LEMON, a generic |
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4 | * C++ optimization library |
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5 | * |
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6 | * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi |
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7 | * Kutatocsoport (Egervary Combinatorial Optimization Research Group, |
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8 | * EGRES). |
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9 | * |
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10 | * Permission to use, modify and distribute this software is granted |
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11 | * provided that this copyright notice appears in all copies. For |
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12 | * precise terms see the accompanying LICENSE file. |
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13 | * |
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14 | * This software is provided "AS IS" with no warranty of any kind, |
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15 | * express or implied, and with no claim as to its suitability for any |
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16 | * purpose. |
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17 | * |
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18 | */ |
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19 | |
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20 | ///\ingroup graph_concepts |
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21 | ///\file |
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22 | ///\brief Undirected graphs and components of. |
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23 | |
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24 | |
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25 | #ifndef LEMON_CONCEPT_UNDIR_GRAPH_H |
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26 | #define LEMON_CONCEPT_UNDIR_GRAPH_H |
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27 | |
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28 | #include <lemon/concept/graph_component.h> |
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29 | |
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30 | namespace lemon { |
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31 | namespace concept { |
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32 | |
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33 | /// \addtogroup graph_concepts |
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34 | /// @{ |
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35 | |
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36 | |
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37 | /// Skeleton class which describes an edge with direction in \ref |
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38 | /// UndirGraph "undirected graph". |
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39 | template <typename UndirEdge> |
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40 | class UndirGraphEdge : public UndirEdge { |
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41 | public: |
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42 | |
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43 | /// \e |
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44 | UndirGraphEdge() {} |
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45 | |
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46 | /// \e |
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47 | UndirGraphEdge(const UndirGraphEdge&) {} |
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48 | |
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49 | /// \e |
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50 | UndirGraphEdge(Invalid) {} |
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51 | |
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52 | /// \brief Constructs a directed version of an undirected edge |
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53 | /// |
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54 | /// \param forward If \c true the direction of the contructed edge |
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55 | /// is the same as the inherent direction of the \c undir_edge; if |
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56 | /// \c false --- the opposite. |
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57 | UndirGraphEdge(UndirEdge undir_edge, bool forward) { |
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58 | ignore_unused_variable_warning(undir_edge); |
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59 | ignore_unused_variable_warning(forward); |
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60 | } |
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61 | |
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62 | /// \e |
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63 | UndirGraphEdge& operator=(UndirGraphEdge) { return *this; } |
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64 | |
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65 | /// \e |
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66 | bool operator==(UndirGraphEdge) const { return true; } |
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67 | /// \e |
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68 | bool operator!=(UndirGraphEdge) const { return false; } |
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69 | |
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70 | /// \e |
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71 | bool operator<(UndirGraphEdge) const { return false; } |
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72 | |
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73 | template <typename Edge> |
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74 | struct Constraints { |
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75 | void constraints() { |
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76 | /// \bug This should be is_base_and_derived ... |
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77 | UndirEdge ue = e; |
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78 | ue = e; |
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79 | Edge forward(ue, true); |
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80 | Edge backward(ue, false); |
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81 | |
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82 | ignore_unused_variable_warning(forward); |
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83 | ignore_unused_variable_warning(backward); |
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84 | } |
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85 | Edge e; |
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86 | }; |
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87 | }; |
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88 | |
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89 | |
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90 | struct BaseIterableUndirGraphConcept { |
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91 | |
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92 | template <typename Graph> |
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93 | struct Constraints { |
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94 | |
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95 | typedef typename Graph::UndirEdge UndirEdge; |
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96 | typedef typename Graph::Edge Edge; |
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97 | typedef typename Graph::Node Node; |
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98 | |
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99 | void constraints() { |
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100 | checkConcept<BaseIterableGraphComponent, Graph>(); |
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101 | checkConcept<GraphItem<>, UndirEdge>(); |
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102 | checkConcept<UndirGraphEdge<UndirEdge>, Edge>(); |
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103 | |
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104 | graph.first(ue); |
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105 | graph.next(ue); |
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106 | |
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107 | const_constraints(); |
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108 | } |
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109 | void const_constraints() { |
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110 | Node n; |
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111 | n = graph.target(ue); |
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112 | n = graph.source(ue); |
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113 | n = graph.oppositeNode(n0, ue); |
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114 | |
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115 | bool b; |
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116 | b = graph.forward(e); |
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117 | ignore_unused_variable_warning(b); |
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118 | } |
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119 | |
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120 | Graph graph; |
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121 | Edge e; |
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122 | Node n0; |
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123 | UndirEdge ue; |
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124 | }; |
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125 | |
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126 | }; |
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127 | |
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128 | |
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129 | struct IterableUndirGraphConcept { |
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130 | |
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131 | template <typename Graph> |
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132 | struct Constraints { |
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133 | void constraints() { |
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134 | /// \todo we don't need the iterable component to be base iterable |
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135 | /// Don't we really??? |
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136 | //checkConcept< BaseIterableUndirGraphConcept, Graph > (); |
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137 | |
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138 | checkConcept<IterableGraphComponent, Graph> (); |
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139 | |
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140 | typedef typename Graph::UndirEdge UndirEdge; |
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141 | typedef typename Graph::UndirEdgeIt UndirEdgeIt; |
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142 | typedef typename Graph::IncEdgeIt IncEdgeIt; |
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143 | |
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144 | checkConcept<GraphIterator<Graph, UndirEdge>, UndirEdgeIt>(); |
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145 | checkConcept<GraphIncIterator<Graph, UndirEdge>, IncEdgeIt>(); |
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146 | } |
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147 | }; |
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148 | |
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149 | }; |
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150 | |
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151 | struct MappableUndirGraphConcept { |
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152 | |
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153 | template <typename Graph> |
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154 | struct Constraints { |
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155 | |
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156 | struct Dummy { |
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157 | int value; |
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158 | Dummy() : value(0) {} |
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159 | Dummy(int _v) : value(_v) {} |
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160 | }; |
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161 | |
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162 | void constraints() { |
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163 | checkConcept<MappableGraphComponent, Graph>(); |
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164 | |
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165 | typedef typename Graph::template UndirEdgeMap<int> IntMap; |
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166 | checkConcept<GraphMap<Graph, typename Graph::UndirEdge, int>, |
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167 | IntMap >(); |
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168 | |
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169 | typedef typename Graph::template UndirEdgeMap<bool> BoolMap; |
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170 | checkConcept<GraphMap<Graph, typename Graph::UndirEdge, bool>, |
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171 | BoolMap >(); |
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172 | |
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173 | typedef typename Graph::template UndirEdgeMap<Dummy> DummyMap; |
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174 | checkConcept<GraphMap<Graph, typename Graph::UndirEdge, Dummy>, |
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175 | DummyMap >(); |
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176 | } |
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177 | }; |
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178 | |
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179 | }; |
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180 | |
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181 | struct ExtendableUndirGraphConcept { |
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182 | |
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183 | template <typename Graph> |
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184 | struct Constraints { |
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185 | void constraints() { |
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186 | node_a = graph.addNode(); |
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187 | uedge = graph.addEdge(node_a, node_b); |
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188 | } |
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189 | typename Graph::Node node_a, node_b; |
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190 | typename Graph::UndirEdge uedge; |
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191 | Graph graph; |
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192 | }; |
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193 | |
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194 | }; |
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195 | |
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196 | struct ErasableUndirGraphConcept { |
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197 | |
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198 | template <typename Graph> |
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199 | struct Constraints { |
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200 | void constraints() { |
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201 | graph.erase(n); |
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202 | graph.erase(e); |
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203 | } |
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204 | Graph graph; |
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205 | typename Graph::Node n; |
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206 | typename Graph::UndirEdge e; |
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207 | }; |
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208 | |
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209 | }; |
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210 | |
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211 | /// Class describing the concept of Undirected Graphs. |
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212 | |
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213 | /// This class describes the common interface of all Undirected |
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214 | /// Graphs. |
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215 | /// |
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216 | /// As all concept describing classes it provides only interface |
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217 | /// without any sensible implementation. So any algorithm for |
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218 | /// undirected graph should compile with this class, but it will not |
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219 | /// run properly, of couse. |
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220 | /// |
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221 | /// In LEMON undirected graphs also fulfill the concept of directed |
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222 | /// graphs (\ref lemon::concept::Graph "Graph Concept"). For |
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223 | /// explanation of this and more see also the page \ref undir_graphs, |
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224 | /// a tutorial about undirected graphs. |
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225 | |
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226 | class UndirGraph { |
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227 | public: |
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228 | |
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229 | /// Type describing a node in the graph |
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230 | typedef GraphNode Node; |
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231 | |
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232 | /// Type describing an undirected edge |
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233 | typedef GraphItem<'u'> UndirEdge; |
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234 | |
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235 | /// Type describing an UndirEdge with direction |
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236 | #ifndef DOXYGEN |
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237 | typedef UndirGraphEdge<UndirEdge> Edge; |
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238 | #else |
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239 | typedef UndirGraphEdge Edge; |
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240 | #endif |
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241 | |
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242 | /// Iterator type which iterates over all nodes |
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243 | #ifndef DOXYGEN |
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244 | typedef GraphIterator<UndirGraph, Node> NodeIt; |
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245 | #else |
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246 | typedef GraphIterator NodeIt; |
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247 | #endif |
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248 | |
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249 | /// Iterator type which iterates over all undirected edges |
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250 | #ifndef DOXYGEN |
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251 | typedef GraphIterator<UndirGraph, UndirEdge> UndirEdgeIt; |
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252 | #else |
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253 | typedef GraphIterator UndirEdgeIt; |
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254 | #endif |
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255 | |
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256 | /// Iterator type which iterates over all directed edges. |
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257 | |
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258 | /// Iterator type which iterates over all edges (each undirected |
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259 | /// edge occurs twice with both directions. |
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260 | #ifndef DOXYGEN |
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261 | typedef GraphIterator<UndirGraph, Edge> EdgeIt; |
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262 | #else |
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263 | typedef GraphIterator EdgeIt; |
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264 | #endif |
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265 | |
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266 | |
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267 | /// Iterator of undirected edges incident to a node |
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268 | #ifndef DOXYGEN |
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269 | typedef GraphIncIterator<UndirGraph, UndirEdge, 'u'> IncEdgeIt; |
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270 | #else |
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271 | typedef GraphIncIterator IncEdgeIt; |
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272 | #endif |
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273 | |
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274 | /// Iterator of edges incoming to a node |
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275 | #ifndef DOXYGEN |
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276 | typedef GraphIncIterator<UndirGraph, Edge, 'i'> InEdgeIt; |
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277 | #else |
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278 | typedef GraphIncIterator InEdgeIt; |
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279 | #endif |
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280 | |
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281 | /// Iterator of edges outgoing from a node |
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282 | #ifndef DOXYGEN |
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283 | typedef GraphIncIterator<UndirGraph, Edge, 'o'> OutEdgeIt; |
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284 | #else |
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285 | typedef GraphIncIterator OutEdgeIt; |
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286 | #endif |
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287 | |
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288 | /// NodeMap template |
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289 | #ifdef DOXYGEN |
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290 | typedef GraphMap NodeMap<T>; |
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291 | #endif |
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292 | |
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293 | /// UndirEdgeMap template |
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294 | #ifdef DOXYGEN |
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295 | typedef GraphMap UndirEdgeMap<T>; |
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296 | #endif |
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297 | |
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298 | /// EdgeMap template |
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299 | #ifdef DOXYGEN |
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300 | typedef GraphMap EdgeMap<T>; |
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301 | #endif |
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302 | |
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303 | template <typename T> |
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304 | class NodeMap : public GraphMap<UndirGraph, Node, T> { |
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305 | typedef GraphMap<UndirGraph, Node, T> Parent; |
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306 | public: |
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307 | |
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308 | explicit NodeMap(const UndirGraph &g) : Parent(g) {} |
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309 | NodeMap(const UndirGraph &g, T t) : Parent(g, t) {} |
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310 | }; |
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311 | |
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312 | template <typename T> |
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313 | class UndirEdgeMap : public GraphMap<UndirGraph, UndirEdge, T> { |
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314 | typedef GraphMap<UndirGraph, UndirEdge, T> Parent; |
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315 | public: |
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316 | |
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317 | explicit UndirEdgeMap(const UndirGraph &g) : Parent(g) {} |
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318 | UndirEdgeMap(const UndirGraph &g, T t) : Parent(g, t) {} |
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319 | }; |
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320 | |
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321 | template <typename T> |
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322 | class EdgeMap : public GraphMap<UndirGraph, Edge, T> { |
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323 | typedef GraphMap<UndirGraph, Edge, T> Parent; |
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324 | public: |
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325 | |
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326 | explicit EdgeMap(const UndirGraph &g) : Parent(g) {} |
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327 | EdgeMap(const UndirGraph &g, T t) : Parent(g, t) {} |
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328 | }; |
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329 | |
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330 | /// Is the Edge oriented "forward"? |
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331 | |
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332 | /// Returns whether the given directed edge is same orientation as |
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333 | /// the corresponding undirected edge. |
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334 | /// |
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335 | /// \todo "What does the direction of an undirected edge mean?" |
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336 | bool forward(Edge) const { return true; } |
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337 | |
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338 | /// Opposite node on an edge |
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339 | |
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340 | /// \return the opposite of the given Node on the given Edge |
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341 | /// |
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342 | /// \todo What should we do if given Node and Edge are not incident? |
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343 | Node oppositeNode(Node, UndirEdge) const { return INVALID; } |
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344 | |
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345 | /// First node of the undirected edge. |
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346 | |
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347 | /// \return the first node of the given UndirEdge. |
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348 | /// |
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349 | /// Naturally undirectected edges don't have direction and thus |
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350 | /// don't have source and target node. But we use these two methods |
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351 | /// to query the two endnodes of the edge. The direction of the edge |
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352 | /// which arises this way is called the inherent direction of the |
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353 | /// undirected edge, and is used to define the "forward" direction |
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354 | /// of the directed versions of the edges. |
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355 | /// \sa forward |
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356 | Node source(UndirEdge) const { return INVALID; } |
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357 | |
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358 | /// Second node of the undirected edge. |
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359 | Node target(UndirEdge) const { return INVALID; } |
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360 | |
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361 | /// Source node of the directed edge. |
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362 | Node source(Edge) const { return INVALID; } |
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363 | |
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364 | /// Target node of the directed edge. |
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365 | Node target(Edge) const { return INVALID; } |
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366 | |
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367 | /// First node of the graph |
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368 | |
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369 | /// \note This method is part of so called \ref |
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370 | /// developpers_interface "Developpers' interface", so it shouldn't |
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371 | /// be used in an end-user program. |
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372 | void first(Node&) const {} |
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373 | /// Next node of the graph |
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374 | |
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375 | /// \note This method is part of so called \ref |
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376 | /// developpers_interface "Developpers' interface", so it shouldn't |
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377 | /// be used in an end-user program. |
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378 | void next(Node&) const {} |
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379 | |
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380 | /// First undirected edge of the graph |
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381 | |
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382 | /// \note This method is part of so called \ref |
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383 | /// developpers_interface "Developpers' interface", so it shouldn't |
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384 | /// be used in an end-user program. |
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385 | void first(UndirEdge&) const {} |
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386 | /// Next undirected edge of the graph |
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387 | |
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388 | /// \note This method is part of so called \ref |
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389 | /// developpers_interface "Developpers' interface", so it shouldn't |
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390 | /// be used in an end-user program. |
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391 | void next(UndirEdge&) const {} |
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392 | |
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393 | /// First directed edge of the graph |
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394 | |
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395 | /// \note This method is part of so called \ref |
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396 | /// developpers_interface "Developpers' interface", so it shouldn't |
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397 | /// be used in an end-user program. |
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398 | void first(Edge&) const {} |
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399 | /// Next directed edge of the graph |
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400 | |
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401 | /// \note This method is part of so called \ref |
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402 | /// developpers_interface "Developpers' interface", so it shouldn't |
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403 | /// be used in an end-user program. |
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404 | void next(Edge&) const {} |
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405 | |
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406 | /// First outgoing edge from a given node |
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407 | |
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408 | /// \note This method is part of so called \ref |
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409 | /// developpers_interface "Developpers' interface", so it shouldn't |
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410 | /// be used in an end-user program. |
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411 | void firstOut(Edge&, Node) const {} |
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412 | /// Next outgoing edge to a node |
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413 | |
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414 | /// \note This method is part of so called \ref |
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415 | /// developpers_interface "Developpers' interface", so it shouldn't |
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416 | /// be used in an end-user program. |
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417 | void nextOut(Edge&) const {} |
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418 | |
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419 | /// First incoming edge to a given node |
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420 | |
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421 | /// \note This method is part of so called \ref |
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422 | /// developpers_interface "Developpers' interface", so it shouldn't |
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423 | /// be used in an end-user program. |
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424 | void firstIn(Edge&, Node) const {} |
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425 | /// Next incoming edge to a node |
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426 | |
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427 | /// \note This method is part of so called \ref |
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428 | /// developpers_interface "Developpers' interface", so it shouldn't |
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429 | /// be used in an end-user program. |
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430 | void nextIn(Edge&) const {} |
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431 | |
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432 | |
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433 | template <typename Graph> |
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434 | struct Constraints { |
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435 | void constraints() { |
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436 | checkConcept<BaseIterableUndirGraphConcept, Graph>(); |
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437 | checkConcept<IterableUndirGraphConcept, Graph>(); |
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438 | checkConcept<MappableUndirGraphConcept, Graph>(); |
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439 | } |
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440 | }; |
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441 | |
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442 | }; |
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443 | |
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444 | class ExtendableUndirGraph : public UndirGraph { |
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445 | public: |
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446 | |
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447 | template <typename Graph> |
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448 | struct Constraints { |
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449 | void constraints() { |
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450 | checkConcept<BaseIterableUndirGraphConcept, Graph>(); |
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451 | checkConcept<IterableUndirGraphConcept, Graph>(); |
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452 | checkConcept<MappableUndirGraphConcept, Graph>(); |
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453 | |
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454 | checkConcept<UndirGraph, Graph>(); |
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455 | checkConcept<ExtendableUndirGraphConcept, Graph>(); |
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456 | checkConcept<ClearableGraphComponent, Graph>(); |
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457 | } |
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458 | }; |
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459 | |
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460 | }; |
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461 | |
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462 | class ErasableUndirGraph : public ExtendableUndirGraph { |
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463 | public: |
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464 | |
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465 | template <typename Graph> |
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466 | struct Constraints { |
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467 | void constraints() { |
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468 | checkConcept<ExtendableUndirGraph, Graph>(); |
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469 | checkConcept<ErasableUndirGraphConcept, Graph>(); |
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470 | } |
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471 | }; |
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472 | |
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473 | }; |
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474 | |
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475 | /// @} |
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476 | |
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477 | } |
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478 | |
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479 | } |
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480 | |
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481 | #endif |
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