1 | #ifndef LIST_GRAPH_HH |
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2 | #define LIST_GRAPH_HH |
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3 | |
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4 | #include <iostream> |
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5 | #include <vector> |
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6 | |
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7 | namespace marci { |
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8 | |
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9 | template <typename It> |
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10 | int count(It it) { |
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11 | int i=0; |
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12 | for( ; it.valid(); ++it) { ++i; } |
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13 | return i; |
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14 | } |
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15 | |
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16 | class ListGraph { |
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17 | |
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18 | class node_item; |
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19 | class edge_item; |
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20 | |
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21 | public: |
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22 | |
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23 | class NodeIt; |
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24 | class EachNodeIt; |
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25 | class EdgeIt; |
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26 | class EachEdgeIt; |
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27 | class OutEdgeIt; |
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28 | class InEdgeIt; |
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29 | class SymEdgeIt; |
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30 | template <typename T> class NodeMap; |
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31 | template <typename T> class EdgeMap; |
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32 | |
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33 | private: |
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34 | |
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35 | template <typename T> friend class NodeMap; |
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36 | template <typename T> friend class EdgeMap; |
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37 | |
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38 | template <typename T> |
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39 | class NodeMap { |
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40 | const ListGraph& G; |
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41 | std::vector<T> container; |
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42 | public: |
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43 | typedef T ValueType; |
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44 | typedef NodeIt KeyType; |
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45 | NodeMap(const ListGraph& _G) : G(_G), container(G.node_id) { } |
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46 | NodeMap(const ListGraph& _G, T a) : |
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47 | G(_G), container(G.node_id, a) { } |
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48 | void set(NodeIt n, T a) { container[/*G.id(n)*/n.node->id]=a; } |
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49 | T get(NodeIt n) const { return container[/*G.id(n)*/n.node->id]; } |
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50 | T& operator[](NodeIt n) { return container[/*G.id(n)*/n.node->id]; } |
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51 | const T& operator[](NodeIt n) const { return container[/*G.id(n)*/n.node->id]; } |
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52 | void resize() { container.resize(G.node_id); } |
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53 | void resize(T a) { container.resize(G.node_id, a); } |
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54 | }; |
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55 | |
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56 | template <typename T> |
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57 | class EdgeMap { |
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58 | const ListGraph& G; |
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59 | std::vector<T> container; |
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60 | public: |
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61 | typedef T ValueType; |
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62 | typedef EdgeIt KeyType; |
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63 | EdgeMap(const ListGraph& _G) : G(_G), container(G.edge_id) { } |
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64 | EdgeMap(const ListGraph& _G, T a) : |
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65 | G(_G), container(G.edge_id, a) { } |
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66 | void set(EdgeIt e, T a) { container[/*G.id(e)*/e.edge->id]=a; } |
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67 | T get(EdgeIt e) const { return container[/*G.id(e)*/e.edge->id]; } |
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68 | T& operator[](EdgeIt e) { return container[/*G.id(e)*/e.edge->id]; } |
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69 | const T& operator[](EdgeIt e) const { return container[/*G.id(e)*/e.edge->id]; } |
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70 | void resize() { container.resize(G.edge_id); } |
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71 | void resize(T a) { container.resize(G.edge_id, a); } |
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72 | }; |
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73 | |
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74 | int node_id; |
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75 | int edge_id; |
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76 | int _node_num; |
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77 | int _edge_num; |
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78 | |
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79 | node_item* _first_node; |
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80 | node_item* _last_node; |
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81 | |
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82 | class node_item { |
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83 | friend class ListGraph; |
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84 | template <typename T> friend class NodeMap; |
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85 | |
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86 | friend class NodeIt; |
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87 | friend class EachNodeIt; |
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88 | friend class EdgeIt; |
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89 | friend class EachEdgeIt; |
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90 | friend class OutEdgeIt; |
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91 | friend class InEdgeIt; |
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92 | friend class SymEdgeIt; |
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93 | friend std::ostream& operator<<(std::ostream& os, const NodeIt& i); |
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94 | friend std::ostream& operator<<(std::ostream& os, const EdgeIt& i); |
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95 | //ListGraph* G; |
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96 | int id; |
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97 | edge_item* _first_out_edge; |
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98 | edge_item* _last_out_edge; |
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99 | edge_item* _first_in_edge; |
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100 | edge_item* _last_in_edge; |
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101 | node_item* _next_node; |
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102 | node_item* _prev_node; |
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103 | public: |
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104 | node_item() { } |
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105 | }; |
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106 | |
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107 | class edge_item { |
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108 | friend class ListGraph; |
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109 | template <typename T> friend class EdgeMap; |
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110 | |
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111 | friend class NodeIt; |
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112 | friend class EachNodeIt; |
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113 | friend class EdgeIt; |
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114 | friend class EachEdgeIt; |
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115 | friend class OutEdgeIt; |
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116 | friend class InEdgeIt; |
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117 | friend class SymEdgeIt; |
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118 | friend std::ostream& operator<<(std::ostream& os, const EdgeIt& i); |
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119 | //ListGraph* G; |
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120 | int id; |
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121 | node_item* _tail; |
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122 | node_item* _head; |
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123 | edge_item* _next_out; |
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124 | edge_item* _prev_out; |
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125 | edge_item* _next_in; |
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126 | edge_item* _prev_in; |
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127 | public: |
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128 | edge_item() { } |
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129 | }; |
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130 | |
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131 | node_item* _add_node() { |
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132 | node_item* p=new node_item; |
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133 | p->id=node_id++; |
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134 | p->_first_out_edge=0; |
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135 | p->_last_out_edge=0; |
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136 | p->_first_in_edge=0; |
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137 | p->_last_in_edge=0; |
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138 | p->_prev_node=_last_node; |
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139 | p->_next_node=0; |
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140 | if (_last_node) _last_node->_next_node=p; |
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141 | _last_node=p; |
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142 | if (!_first_node) _first_node=p; |
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143 | |
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144 | ++_node_num; |
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145 | return p; |
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146 | } |
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147 | |
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148 | edge_item* _add_edge(node_item* _tail, node_item* _head) { |
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149 | edge_item* e=new edge_item; |
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150 | e->id=edge_id++; |
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151 | e->_tail=_tail; |
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152 | e->_head=_head; |
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153 | |
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154 | e->_prev_out=_tail->_last_out_edge; |
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155 | if (_tail->_last_out_edge) (_tail->_last_out_edge)->_next_out=e; |
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156 | _tail->_last_out_edge=e; |
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157 | if (!_tail->_first_out_edge) _tail->_first_out_edge=e; |
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158 | e->_next_out=0; |
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159 | |
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160 | e->_prev_in=_head->_last_in_edge; |
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161 | if (_head->_last_in_edge) (_head->_last_in_edge)->_next_in=e; |
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162 | _head->_last_in_edge=e; |
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163 | if (!_head->_first_in_edge) { _head->_first_in_edge=e; } |
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164 | e->_next_in=0; |
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165 | |
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166 | ++_edge_num; |
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167 | return e; |
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168 | } |
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169 | |
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170 | //deletes a node which has no out edge and no in edge |
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171 | void _delete_node(node_item* v) { |
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172 | if (v->_next_node) (v->_next_node)->_prev_node=v->_prev_node; else |
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173 | _last_node=v->_prev_node; |
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174 | if (v->_prev_node) (v->_prev_node)->_next_node=v->_next_node; else |
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175 | _first_node=v->_next_node; |
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176 | |
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177 | delete v; |
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178 | --_node_num; |
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179 | } |
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180 | |
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181 | void _delete_edge(edge_item* e) { |
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182 | if (e->_next_out) (e->_next_out)->_prev_out=e->_prev_out; else |
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183 | (e->_tail)->_last_out_edge=e->_prev_out; |
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184 | if (e->_prev_out) (e->_prev_out)->_next_out=e->_next_out; else |
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185 | (e->_tail)->_first_out_edge=e->_next_out; |
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186 | if (e->_next_in) (e->_next_in)->_prev_in=e->_prev_in; else |
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187 | (e->_head)->_last_in_edge=e->_prev_in; |
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188 | if (e->_prev_in) (e->_prev_in)->_next_in=e->_next_in; else |
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189 | (e->_head)->_first_in_edge=e->_next_in; |
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190 | |
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191 | delete e; |
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192 | --_edge_num; |
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193 | } |
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194 | |
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195 | void _set_tail(edge_item* e, node_item* _tail) { |
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196 | if (e->_next_out) (e->_next_out)->_prev_out=e->_prev_out; else |
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197 | (e->_tail)->_last_out_edge=e->_prev_out; |
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198 | if (e->_prev_out) (e->_prev_out)->_next_out=e->_next_out; else |
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199 | (e->_tail)->_first_out_edge=e->_next_out; |
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200 | |
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201 | e->_tail=_tail; |
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202 | |
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203 | e->_prev_out=_tail->_last_out_edge; |
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204 | if (_tail->_last_out_edge) (_tail->_last_out_edge)->_next_out=e; |
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205 | _tail->_last_out_edge=e; |
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206 | if (!_tail->_first_out_edge) _tail->_first_out_edge=e; |
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207 | e->_next_out=0; |
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208 | } |
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209 | |
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210 | void _set_head(edge_item* e, node_item* _head) { |
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211 | if (e->_next_in) (e->_next_in)->_prev_in=e->_prev_in; else |
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212 | (e->_head)->_last_in_edge=e->_prev_in; |
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213 | if (e->_prev_in) (e->_prev_in)->_next_in=e->_next_in; else |
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214 | (e->_head)->_first_in_edge=e->_next_in; |
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215 | |
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216 | e->_head=_head; |
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217 | |
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218 | e->_prev_in=_head->_last_in_edge; |
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219 | if (_head->_last_in_edge) (_head->_last_in_edge)->_next_in=e; |
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220 | _head->_last_in_edge=e; |
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221 | if (!_head->_first_in_edge) { _head->_first_in_edge=e; } |
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222 | e->_next_in=0; |
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223 | } |
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224 | |
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225 | public: |
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226 | |
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227 | /* default constructor */ |
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228 | |
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229 | ListGraph() : node_id(0), edge_id(0), _node_num(0), _edge_num(0), _first_node(0), _last_node(0) { } |
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230 | |
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231 | ~ListGraph() { |
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232 | while (first<EachNodeIt>().valid()) erase(first<EachNodeIt>()); |
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233 | } |
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234 | |
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235 | int nodeNum() const { return _node_num; } |
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236 | int edgeNum() const { return _edge_num; } |
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237 | |
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238 | /* functions to construct iterators from the graph, or from each other */ |
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239 | |
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240 | //EachNodeIt firstNode() const { return EachNodeIt(*this); } |
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241 | //EachEdgeIt firstEdge() const { return EachEdgeIt(*this); } |
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242 | |
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243 | //OutEdgeIt firstOutEdge(const NodeIt v) const { return OutEdgeIt(v); } |
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244 | //InEdgeIt firstInEdge(const NodeIt v) const { return InEdgeIt(v); } |
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245 | //SymEdgeIt firstSymEdge(const NodeIt v) const { return SymEdgeIt(v); } |
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246 | NodeIt tail(EdgeIt e) const { return e.tailNode(); } |
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247 | NodeIt head(EdgeIt e) const { return e.headNode(); } |
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248 | |
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249 | NodeIt aNode(const OutEdgeIt& e) const { return e.aNode(); } |
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250 | NodeIt aNode(const InEdgeIt& e) const { return e.aNode(); } |
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251 | NodeIt aNode(const SymEdgeIt& e) const { return e.aNode(); } |
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252 | |
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253 | NodeIt bNode(const OutEdgeIt& e) const { return e.bNode(); } |
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254 | NodeIt bNode(const InEdgeIt& e) const { return e.bNode(); } |
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255 | NodeIt bNode(const SymEdgeIt& e) const { return e.bNode(); } |
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256 | |
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257 | //NodeIt invalid_node() { return NodeIt(); } |
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258 | //EdgeIt invalid_edge() { return EdgeIt(); } |
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259 | //OutEdgeIt invalid_out_edge() { return OutEdgeIt(); } |
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260 | //InEdgeIt invalid_in_edge() { return InEdgeIt(); } |
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261 | //SymEdgeIt invalid_sym_edge() { return SymEdgeIt(); } |
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262 | |
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263 | /* same methods in other style */ |
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264 | /* for experimental purpose */ |
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265 | |
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266 | EachNodeIt& getFirst(EachNodeIt& v) const { |
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267 | v=EachNodeIt(*this); return v; } |
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268 | EachEdgeIt& getFirst(EachEdgeIt& e) const { |
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269 | e=EachEdgeIt(*this); return e; } |
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270 | OutEdgeIt& getFirst(OutEdgeIt& e, NodeIt v) const { |
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271 | e=OutEdgeIt(v); return e; } |
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272 | InEdgeIt& getFirst(InEdgeIt& e, NodeIt v) const { |
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273 | e=InEdgeIt(v); return e; } |
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274 | SymEdgeIt& getFirst(SymEdgeIt& e, NodeIt v) const { |
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275 | e=SymEdgeIt(v); return e; } |
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276 | //void getTail(NodeIt& n, const EdgeIt& e) const { n=tail(e); } |
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277 | //void getHead(NodeIt& n, const EdgeIt& e) const { n=head(e); } |
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278 | |
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279 | //void getANode(NodeIt& n, const OutEdgeIt& e) const { n=e.aNode(); } |
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280 | //void getANode(NodeIt& n, const InEdgeIt& e) const { n=e.aNode(); } |
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281 | //void getANode(NodeIt& n, const SymEdgeIt& e) const { n=e.aNode(); } |
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282 | //void getBNode(NodeIt& n, const OutEdgeIt& e) const { n=e.bNode(); } |
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283 | //void getBNode(NodeIt& n, const InEdgeIt& e) const { n=e.bNode(); } |
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284 | //void getBNode(NodeIt& n, const SymEdgeIt& e) const { n=e.bNode(); } |
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285 | //void get_invalid(NodeIt& n) { n=NodeIt(); } |
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286 | //void get_invalid(EdgeIt& e) { e=EdgeIt(); } |
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287 | //void get_invalid(OutEdgeIt& e) { e=OutEdgeIt(); } |
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288 | //void get_invalid(InEdgeIt& e) { e=InEdgeIt(); } |
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289 | //void get_invalid(SymEdgeIt& e) { e=SymEdgeIt(); } |
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290 | |
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291 | template< typename It > |
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292 | It first() const { |
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293 | It e; |
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294 | getFirst(e); |
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295 | return e; |
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296 | } |
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297 | |
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298 | template< typename It > |
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299 | It first(NodeIt v) const { |
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300 | It e; |
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301 | getFirst(e, v); |
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302 | return e; |
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303 | } |
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304 | |
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305 | bool valid(EdgeIt e) const { return e.valid(); } |
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306 | bool valid(NodeIt n) const { return n.valid(); } |
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307 | |
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308 | template <typename It> It next(It it) const { |
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309 | It tmp(it); return goNext(it); } |
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310 | template <typename It> It& goNext(It& it) const { return ++it; } |
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311 | |
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312 | |
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313 | /* for getting id's of graph objects */ |
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314 | /* these are important for the implementation of property vectors */ |
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315 | |
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316 | int id(NodeIt v) const { return v.node->id; } |
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317 | int id(EdgeIt e) const { return e.edge->id; } |
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318 | |
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319 | /* adding nodes and edges */ |
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320 | |
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321 | NodeIt addNode() { return NodeIt(_add_node()); } |
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322 | EdgeIt addEdge(NodeIt u, NodeIt v) { |
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323 | return EdgeIt(_add_edge(u.node, v.node)); |
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324 | } |
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325 | |
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326 | void erase(NodeIt i) { |
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327 | while (first<OutEdgeIt>(i).valid()) erase(first<OutEdgeIt>(i)); |
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328 | while (first<InEdgeIt>(i).valid()) erase(first<InEdgeIt>(i)); |
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329 | _delete_node(i.node); |
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330 | } |
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331 | |
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332 | void erase(EdgeIt e) { _delete_edge(e.edge); } |
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333 | |
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334 | void clear() { |
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335 | while (first<EachNodeIt>().valid()) erase(first<EachNodeIt>()); |
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336 | } |
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337 | |
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338 | void setTail(EdgeIt e, NodeIt tail) { |
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339 | _set_tail(e.edge, tail.node); |
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340 | } |
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341 | |
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342 | void setHead(EdgeIt e, NodeIt head) { |
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343 | _set_head(e.edge, head.node); |
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344 | } |
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345 | |
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346 | /* stream operations, for testing purpose */ |
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347 | |
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348 | friend std::ostream& operator<<(std::ostream& os, const NodeIt& i) { |
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349 | os << i.node->id; return os; |
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350 | } |
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351 | friend std::ostream& operator<<(std::ostream& os, const EdgeIt& i) { |
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352 | os << "(" << i.edge->_tail->id << "--" << i.edge->id << "->" << i.edge->_head->id << ")"; |
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353 | return os; |
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354 | } |
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355 | |
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356 | class NodeIt { |
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357 | friend class ListGraph; |
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358 | template <typename T> friend class NodeMap; |
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359 | |
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360 | friend class EdgeIt; |
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361 | friend class OutEdgeIt; |
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362 | friend class InEdgeIt; |
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363 | friend class SymEdgeIt; |
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364 | protected: |
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365 | node_item* node; |
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366 | friend int ListGraph::id(NodeIt v) const; |
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367 | public: |
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368 | NodeIt() : node(0) { } |
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369 | NodeIt(node_item* _node) : node(_node) { } |
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370 | bool valid() const { return (node!=0); } |
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371 | //void makeInvalid() { node=0; } |
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372 | friend bool operator==(const NodeIt& u, const NodeIt& v) { |
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373 | return v.node==u.node; |
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374 | } |
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375 | friend bool operator!=(const NodeIt& u, const NodeIt& v) { |
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376 | return v.node!=u.node; |
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377 | } |
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378 | friend std::ostream& operator<<(std::ostream& os, const NodeIt& i); |
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379 | }; |
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380 | |
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381 | class EachNodeIt : public NodeIt { |
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382 | friend class ListGraph; |
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383 | protected: |
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384 | EachNodeIt(const ListGraph& G) : NodeIt(G._first_node) { } |
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385 | public: |
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386 | EachNodeIt() : NodeIt() { } |
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387 | EachNodeIt(node_item* v) : NodeIt(v) { } |
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388 | EachNodeIt& operator++() { node=node->_next_node; return *this; } |
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389 | }; |
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390 | |
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391 | class EdgeIt { |
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392 | friend class ListGraph; |
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393 | template <typename T> friend class EdgeMap; |
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394 | |
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395 | friend class NodeIt; |
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396 | friend class EachNodeIt; |
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397 | protected: |
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398 | edge_item* edge; |
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399 | friend int ListGraph::id(EdgeIt e) const; |
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400 | public: |
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401 | EdgeIt() : edge(0) { } |
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402 | //EdgeIt() { } |
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403 | EdgeIt(edge_item* _edge) : edge(_edge) { } |
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404 | bool valid() const { return (edge!=0); } |
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405 | //void makeInvalid() { edge=0; } |
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406 | friend bool operator==(const EdgeIt& u, const EdgeIt& v) { |
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407 | return v.edge==u.edge; |
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408 | } |
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409 | friend bool operator!=(const EdgeIt& u, const EdgeIt& v) { |
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410 | return v.edge!=u.edge; |
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411 | } |
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412 | protected: |
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413 | NodeIt tailNode() const { return NodeIt(edge->_tail); } |
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414 | NodeIt headNode() const { return NodeIt(edge->_head); } |
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415 | public: |
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416 | friend std::ostream& operator<<(std::ostream& os, const EdgeIt& i); |
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417 | }; |
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418 | |
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419 | class EachEdgeIt : public EdgeIt { |
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420 | friend class ListGraph; |
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421 | protected: |
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422 | EachEdgeIt(const ListGraph& G) { |
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423 | node_item* v=G._first_node; |
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424 | if (v) edge=v->_first_out_edge; else edge=0; |
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425 | while (v && !edge) { v=v->_next_node; if (v) edge=v->_first_out_edge; } |
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426 | } |
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427 | public: |
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428 | EachEdgeIt() : EdgeIt() { } |
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429 | EachEdgeIt(edge_item* _e) : EdgeIt(_e) { } |
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430 | EachEdgeIt& operator++() { |
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431 | node_item* v=edge->_tail; |
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432 | edge=edge->_next_out; |
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433 | while (v && !edge) { v=v->_next_node; if (v) edge=v->_first_out_edge; } |
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434 | return *this; |
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435 | } |
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436 | }; |
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437 | |
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438 | class OutEdgeIt : public EdgeIt { |
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439 | friend class ListGraph; |
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440 | //node_item* v; |
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441 | protected: |
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442 | OutEdgeIt(const NodeIt& _v) /*: v(_v.node)*/ { edge=_v.node->_first_out_edge; } |
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443 | public: |
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444 | OutEdgeIt() : EdgeIt()/*, v(0)*/ { } |
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445 | OutEdgeIt(const ListGraph& G, NodeIt _v) /*: v(_v.node)*/ { edge=_v.node->_first_out_edge; } |
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446 | OutEdgeIt& operator++() { edge=edge->_next_out; return *this; } |
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447 | protected: |
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448 | NodeIt aNode() const { return NodeIt(edge->_tail); } |
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449 | NodeIt bNode() const { return NodeIt(edge->_head); } |
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450 | }; |
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451 | |
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452 | class InEdgeIt : public EdgeIt { |
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453 | friend class ListGraph; |
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454 | //node_item* v; |
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455 | protected: |
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456 | InEdgeIt(const NodeIt& _v) /*: v(_v.node)*/ { edge=_v.node->_first_in_edge; } |
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457 | public: |
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458 | InEdgeIt() : EdgeIt()/*, v(0)*/ { } |
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459 | InEdgeIt(const ListGraph& G, NodeIt _v) /*: v(_v.node)*/ { edge=_v.node->_first_in_edge; } |
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460 | InEdgeIt& operator++() { edge=edge->_next_in; return *this; } |
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461 | protected: |
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462 | NodeIt aNode() const { return NodeIt(edge->_head); } |
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463 | NodeIt bNode() const { return NodeIt(edge->_tail); } |
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464 | }; |
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465 | |
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466 | class SymEdgeIt : public EdgeIt { |
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467 | friend class ListGraph; |
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468 | bool out_or_in; //1 iff out, 0 iff in |
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469 | //node_item* v; |
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470 | protected: |
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471 | SymEdgeIt(const NodeIt& _v) /*: v(_v.node)*/ { |
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472 | out_or_in=1; |
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473 | edge=_v.node->_first_out_edge; |
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474 | if (!edge) { edge=_v.node->_first_in_edge; out_or_in=0; } |
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475 | } |
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476 | public: |
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477 | SymEdgeIt() : EdgeIt() /*, v(0)*/ { } |
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478 | SymEdgeIt(const ListGraph& G, NodeIt _v) /*: v(_v.node)*/ { |
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479 | out_or_in=1; |
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480 | edge=_v.node->_first_out_edge; |
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481 | if (!edge) { edge=_v.node->_first_in_edge; out_or_in=0; } |
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482 | } |
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483 | SymEdgeIt& operator++() { |
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484 | if (out_or_in) { |
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485 | node_item* v=edge->_tail; |
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486 | edge=edge->_next_out; |
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487 | if (!edge) { out_or_in=0; edge=v->_first_in_edge; } |
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488 | } else { |
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489 | edge=edge->_next_in; |
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490 | } |
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491 | return *this; |
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492 | } |
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493 | protected: |
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494 | NodeIt aNode() const { |
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495 | return (out_or_in) ? NodeIt(edge->_tail) : NodeIt(edge->_head); } |
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496 | NodeIt bNode() const { |
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497 | return (out_or_in) ? NodeIt(edge->_head) : NodeIt(edge->_tail); } |
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498 | }; |
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499 | |
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500 | }; |
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501 | |
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502 | /* |
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503 | template< typename T > |
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504 | T ListGraph::first() const { |
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505 | std::cerr << "Invalid use of template<typemane T> T ListGraph::first<T>();" << std::endl; |
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506 | return T(); |
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507 | } |
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508 | |
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509 | template<> |
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510 | ListGraph::EachNodeIt ListGraph::first<ListGraph::EachNodeIt>() const { |
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511 | return firstNode(); |
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512 | } |
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513 | |
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514 | template<> |
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515 | ListGraph::EachEdgeIt ListGraph::first<ListGraph::EachEdgeIt>() const { |
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516 | return firstEdge(); |
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517 | } |
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518 | |
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519 | template< typename T > |
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520 | T ListGraph::first(ListGraph::NodeIt v) const { |
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521 | std::cerr << "Invalid use of template<typemane T> T ListGraph::first<T>(ListGRaph::NodeIt);" << std::endl; |
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522 | return T(); |
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523 | } |
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524 | |
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525 | template<> |
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526 | ListGraph::OutEdgeIt ListGraph::first<ListGraph::OutEdgeIt>(const ListGraph::NodeIt v) const { |
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527 | return firstOutEdge(v); |
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528 | } |
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529 | |
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530 | template<> |
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531 | ListGraph::InEdgeIt ListGraph::first<ListGraph::InEdgeIt>(const ListGraph::NodeIt v) const { |
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532 | return firstInEdge(v); |
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533 | } |
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534 | |
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535 | template<> |
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536 | ListGraph::SymEdgeIt ListGraph::first<ListGraph::SymEdgeIt>(const ListGraph::NodeIt v) const { |
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537 | return firstSymEdge(v); |
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538 | } |
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539 | */ |
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540 | |
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541 | |
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542 | } //namespace marci |
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543 | |
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544 | #endif //LIST_GRAPH_HH |
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