1 | // -*- c++ -*- |
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2 | #ifndef LEMON_ITERABLE_GRAPH_EXTENDER_H |
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3 | #define LEMON_ITERABLE_GRAPH_EXTENDER_H |
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4 | |
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5 | #include <lemon/invalid.h> |
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6 | #include <lemon/utility.h> |
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7 | |
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8 | namespace lemon { |
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9 | |
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10 | template <typename _Base> |
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11 | class IterableGraphExtender : public _Base { |
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12 | public: |
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13 | |
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14 | /// Indicates that the graph is undirected. |
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15 | |
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16 | ///\todo Better name? |
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17 | /// |
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18 | ///\bug Should it be here? |
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19 | typedef False UndirTag; |
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20 | |
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21 | typedef _Base Parent; |
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22 | typedef IterableGraphExtender<_Base> Graph; |
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23 | |
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24 | typedef typename Parent::Node Node; |
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25 | typedef typename Parent::Edge Edge; |
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26 | |
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27 | |
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28 | class NodeIt : public Node { |
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29 | const Graph* graph; |
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30 | public: |
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31 | |
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32 | NodeIt() {} |
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33 | |
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34 | NodeIt(Invalid i) : Node(i) { } |
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35 | |
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36 | explicit NodeIt(const Graph& _graph) : graph(&_graph) { |
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37 | _graph.first(*static_cast<Node*>(this)); |
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38 | } |
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39 | |
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40 | NodeIt(const Graph& _graph, const Node& node) |
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41 | : Node(node), graph(&_graph) {} |
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42 | |
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43 | NodeIt& operator++() { |
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44 | graph->next(*this); |
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45 | return *this; |
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46 | } |
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47 | |
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48 | }; |
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49 | |
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50 | |
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51 | class EdgeIt : public Edge { |
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52 | const Graph* graph; |
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53 | public: |
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54 | |
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55 | EdgeIt() { } |
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56 | |
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57 | EdgeIt(Invalid i) : Edge(i) { } |
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58 | |
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59 | explicit EdgeIt(const Graph& _graph) : graph(&_graph) { |
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60 | _graph.first(*static_cast<Edge*>(this)); |
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61 | } |
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62 | |
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63 | EdgeIt(const Graph& _graph, const Edge& e) : |
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64 | Edge(e), graph(&_graph) { } |
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65 | |
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66 | EdgeIt& operator++() { |
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67 | graph->next(*this); |
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68 | return *this; |
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69 | } |
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70 | |
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71 | }; |
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72 | |
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73 | |
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74 | class OutEdgeIt : public Edge { |
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75 | const Graph* graph; |
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76 | public: |
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77 | |
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78 | OutEdgeIt() { } |
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79 | |
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80 | OutEdgeIt(Invalid i) : Edge(i) { } |
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81 | |
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82 | OutEdgeIt(const Graph& _graph, const Node& node) |
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83 | : graph(&_graph) { |
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84 | _graph.firstOut(*this, node); |
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85 | } |
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86 | |
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87 | OutEdgeIt(const Graph& _graph, const Edge& edge) |
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88 | : Edge(edge), graph(&_graph) {} |
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89 | |
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90 | OutEdgeIt& operator++() { |
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91 | graph->nextOut(*this); |
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92 | return *this; |
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93 | } |
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94 | |
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95 | }; |
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96 | |
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97 | |
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98 | class InEdgeIt : public Edge { |
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99 | const Graph* graph; |
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100 | public: |
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101 | |
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102 | InEdgeIt() { } |
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103 | |
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104 | InEdgeIt(Invalid i) : Edge(i) { } |
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105 | |
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106 | InEdgeIt(const Graph& _graph, const Node& node) |
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107 | : graph(&_graph) { |
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108 | _graph.firstIn(*this, node); |
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109 | } |
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110 | |
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111 | InEdgeIt(const Graph& _graph, const Edge& edge) : |
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112 | Edge(edge), graph(&_graph) {} |
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113 | |
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114 | InEdgeIt& operator++() { |
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115 | graph->nextIn(*this); |
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116 | return *this; |
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117 | } |
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118 | |
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119 | }; |
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120 | |
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121 | /// \brief Base node of the iterator |
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122 | /// |
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123 | /// Returns the base node (ie. the source in this case) of the iterator |
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124 | Node baseNode(const OutEdgeIt &e) const { |
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125 | return Parent::source((Edge)e); |
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126 | } |
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127 | /// \brief Running node of the iterator |
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128 | /// |
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129 | /// Returns the running node (ie. the target in this case) of the |
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130 | /// iterator |
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131 | Node runningNode(const OutEdgeIt &e) const { |
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132 | return Parent::target((Edge)e); |
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133 | } |
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134 | |
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135 | /// \brief Base node of the iterator |
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136 | /// |
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137 | /// Returns the base node (ie. the target in this case) of the iterator |
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138 | Node baseNode(const InEdgeIt &e) const { |
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139 | return Parent::target((Edge)e); |
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140 | } |
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141 | /// \brief Running node of the iterator |
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142 | /// |
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143 | /// Returns the running node (ie. the source in this case) of the |
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144 | /// iterator |
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145 | Node runningNode(const InEdgeIt &e) const { |
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146 | return Parent::source((Edge)e); |
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147 | } |
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148 | |
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149 | using Parent::first; |
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150 | |
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151 | /// \brief The opposite node on the given edge. |
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152 | /// |
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153 | /// Gives back the opposite on the given edge. |
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154 | Node oppositeNode(const Node& n, const Edge& e) const { |
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155 | if (Parent::source(e) == n) { |
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156 | return Parent::target(e); |
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157 | } else { |
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158 | return Parent::source(e); |
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159 | } |
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160 | } |
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161 | |
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162 | private: |
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163 | |
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164 | // void first(NodeIt &) const; |
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165 | // void first(EdgeIt &) const; |
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166 | // void first(OutEdgeIt &) const; |
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167 | // void first(InEdgeIt &) const; |
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168 | |
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169 | }; |
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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 | |
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175 | |
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176 | template <typename _Base> |
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177 | class IterableUndirGraphExtender : public IterableGraphExtender<_Base> { |
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178 | public: |
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179 | |
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180 | /// Indicates that the graph is undirected. |
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181 | |
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182 | ///\todo Better name? |
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183 | /// |
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184 | ///\bug Should it be here? |
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185 | ///\bug Should be tested in the concept checker whether it is defined |
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186 | ///correctly. |
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187 | typedef True UndirTag; |
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188 | |
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189 | typedef IterableGraphExtender<_Base> Parent; |
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190 | typedef IterableUndirGraphExtender<_Base> Graph; |
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191 | typedef typename Parent::Node Node; |
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192 | typedef typename Parent::Edge Edge; |
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193 | typedef typename Parent::UndirEdge UndirEdge; |
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194 | |
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195 | class UndirEdgeIt : public Parent::UndirEdge { |
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196 | const Graph* graph; |
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197 | public: |
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198 | |
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199 | UndirEdgeIt() { } |
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200 | |
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201 | UndirEdgeIt(Invalid i) : UndirEdge(i) { } |
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202 | |
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203 | explicit UndirEdgeIt(const Graph& _graph) : graph(&_graph) { |
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204 | _graph.first(*static_cast<UndirEdge*>(this)); |
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205 | } |
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206 | |
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207 | UndirEdgeIt(const Graph& _graph, const UndirEdge& e) : |
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208 | UndirEdge(e), graph(&_graph) { } |
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209 | |
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210 | UndirEdgeIt& operator++() { |
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211 | graph->next(*this); |
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212 | return *this; |
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213 | } |
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214 | |
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215 | }; |
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216 | |
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217 | class IncEdgeIt : public Parent::UndirEdge { |
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218 | const Graph* graph; |
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219 | bool direction; |
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220 | friend class IterableUndirGraphExtender; |
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221 | public: |
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222 | |
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223 | IncEdgeIt() { } |
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224 | |
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225 | IncEdgeIt(Invalid i) : UndirEdge(i), direction(false) { } |
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226 | |
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227 | IncEdgeIt(const Graph& _graph, const Node &n) : graph(&_graph) { |
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228 | _graph.firstInc(*this, direction, n); |
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229 | } |
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230 | |
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231 | IncEdgeIt(const Graph& _graph, const UndirEdge &ue, const Node &n) |
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232 | : graph(&_graph), UndirEdge(ue) { |
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233 | direction = (_graph.source(ue) == n); |
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234 | } |
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235 | |
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236 | IncEdgeIt& operator++() { |
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237 | graph->nextInc(*this, direction); |
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238 | return *this; |
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239 | } |
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240 | }; |
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241 | |
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242 | using Parent::baseNode; |
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243 | using Parent::runningNode; |
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244 | |
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245 | /// Base node of the iterator |
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246 | /// |
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247 | /// Returns the base node of the iterator |
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248 | Node baseNode(const IncEdgeIt &e) const { |
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249 | return e.direction ? source(e) : target(e); |
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250 | } |
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251 | /// Running node of the iterator |
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252 | /// |
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253 | /// Returns the running node of the iterator |
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254 | Node runningNode(const IncEdgeIt &e) const { |
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255 | return e.direction ? target(e) : source(e); |
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256 | } |
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257 | |
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258 | /// \brief The opposite node on the given undirected edge. |
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259 | /// |
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260 | /// Gives back the opposite on the given undirected edge. |
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261 | Node oppositeNode(const Node& n, const UndirEdge& e) const { |
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262 | if (Parent::source(e) == n) { |
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263 | return Parent::target(e); |
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264 | } else { |
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265 | return Parent::source(e); |
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266 | } |
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267 | } |
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268 | |
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269 | }; |
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270 | } |
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271 | |
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272 | #endif // LEMON_GRAPH_EXTENDER_H |
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