1 | /* -*- C++ -*- |
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2 | * lemon/edge_set.h - Part of LEMON, a generic C++ optimization library |
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3 | * |
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4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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6 | * |
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7 | * Permission to use, modify and distribute this software is granted |
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8 | * provided that this copyright notice appears in all copies. For |
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9 | * precise terms see the accompanying LICENSE file. |
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10 | * |
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11 | * This software is provided "AS IS" with no warranty of any kind, |
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12 | * express or implied, and with no claim as to its suitability for any |
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13 | * purpose. |
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14 | * |
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15 | */ |
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16 | |
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17 | #ifndef LEMON_EDGE_SET_H |
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18 | #define LEMON_EDGE_SET_H |
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19 | |
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20 | /// \ingroup graphs |
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21 | /// \file |
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22 | /// \brief EdgeSet classes. |
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23 | /// |
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24 | /// Graphs which use another graph's node-set as own. |
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25 | |
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26 | namespace lemon { |
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27 | |
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28 | template <typename _Graph> |
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29 | class ListEdgeSetBase { |
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30 | public: |
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31 | |
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32 | typedef _Graph Graph; |
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33 | typedef typename Graph::Node Node; |
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34 | typedef typename Graph::NodeIt NodeIt; |
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35 | |
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36 | protected: |
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37 | |
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38 | struct NodeT { |
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39 | int first_out, first_in; |
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40 | NodeT() : first_out(-1), first_in(-1) {} |
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41 | }; |
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42 | |
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43 | typedef typename Graph::template NodeMap<NodeT> NodesImplBase; |
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44 | |
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45 | NodesImplBase* nodes; |
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46 | |
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47 | struct EdgeT { |
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48 | Node source, target; |
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49 | int next_out, next_in; |
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50 | int prev_out, prev_in; |
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51 | EdgeT() : prev_out(-1), prev_in(-1) {} |
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52 | }; |
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53 | |
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54 | std::vector<EdgeT> edges; |
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55 | |
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56 | int first_edge; |
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57 | int first_free_edge; |
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58 | |
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59 | const Graph* graph; |
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60 | |
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61 | void initalize(const Graph& _graph, NodesImplBase& _nodes) { |
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62 | graph = &_graph; |
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63 | nodes = &_nodes; |
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64 | } |
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65 | |
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66 | public: |
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67 | |
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68 | class Edge { |
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69 | friend class ListEdgeSetBase<Graph>; |
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70 | protected: |
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71 | Edge(int _id) : id(_id) {} |
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72 | int id; |
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73 | public: |
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74 | Edge() {} |
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75 | Edge(Invalid) : id(-1) {} |
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76 | bool operator==(const Edge& edge) const { return id == edge.id; } |
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77 | bool operator!=(const Edge& edge) const { return id != edge.id; } |
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78 | bool operator<(const Edge& edge) const { return id < edge.id; } |
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79 | }; |
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80 | |
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81 | ListEdgeSetBase() : first_edge(-1), first_free_edge(-1) {} |
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82 | |
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83 | Edge addEdge(const Node& source, const Node& target) { |
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84 | int n; |
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85 | if (first_free_edge == -1) { |
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86 | n = edges.size(); |
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87 | edges.push_back(EdgeT()); |
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88 | } else { |
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89 | n = first_free_edge; |
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90 | first_free_edge = edges[first_free_edge].next_in; |
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91 | } |
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92 | edges[n].next_in = (*nodes)[target].first_in; |
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93 | (*nodes)[target].first_in = n; |
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94 | edges[n].next_out = (*nodes)[source].first_out; |
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95 | (*nodes)[source].first_out = n; |
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96 | edges[n].source = source; |
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97 | edges[n].target = target; |
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98 | return Edge(n); |
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99 | } |
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100 | |
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101 | void erase(const Edge& edge) { |
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102 | int n = edge.id; |
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103 | if (edges[n].prev_in != -1) { |
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104 | edges[edges[n].prev_in].next_in = edges[n].next_in; |
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105 | } else { |
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106 | (*nodes)[edges[n].target].first_in = edges[n].next_in; |
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107 | } |
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108 | if (edges[n].next_in != -1) { |
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109 | edges[edges[n].next_in].prev_in = edges[n].prev_in; |
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110 | } |
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111 | |
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112 | if (edges[n].prev_out != -1) { |
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113 | edges[edges[n].prev_out].next_out = edges[n].next_out; |
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114 | } else { |
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115 | (*nodes)[edges[n].source].first_out = edges[n].next_out; |
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116 | } |
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117 | if (edges[n].next_out != -1) { |
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118 | edges[edges[n].next_out].prev_out = edges[n].prev_out; |
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119 | } |
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120 | |
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121 | } |
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122 | |
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123 | void clear() { |
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124 | edges.clear(); |
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125 | first_edge = -1; |
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126 | first_free_edge = -1; |
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127 | } |
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128 | |
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129 | void first(Node& node) const { |
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130 | graph->first(node); |
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131 | } |
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132 | |
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133 | void next(Node& node) const { |
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134 | graph->next(node); |
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135 | } |
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136 | |
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137 | void first(Edge& edge) const { |
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138 | Node node; |
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139 | for (first(node); node != INVALID && (*nodes)[node].first_in == -1; |
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140 | next(node)); |
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141 | edge.id = (node == INVALID) ? -1 : (*nodes)[node].first_in; |
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142 | } |
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143 | |
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144 | void next(Edge& edge) const { |
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145 | if (edges[edge.id].next_in != -1) { |
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146 | edge.id = edges[edge.id].next_in; |
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147 | } else { |
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148 | Node node = edges[edge.id].target; |
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149 | for (next(node); node != INVALID && (*nodes)[node].first_in == -1; |
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150 | next(node)); |
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151 | edge.id = (node == INVALID) ? -1 : (*nodes)[node].first_in; |
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152 | } |
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153 | } |
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154 | |
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155 | void firstOut(Edge& edge, const Node& node) const { |
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156 | edge.id = (*nodes)[node].first_out; |
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157 | } |
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158 | |
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159 | void nextOut(Edge& edge) const { |
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160 | edge.id = edges[edge.id].next_out; |
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161 | } |
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162 | |
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163 | void firstIn(Edge& edge, const Node& node) const { |
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164 | edge.id = (*nodes)[node].first_in; |
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165 | } |
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166 | |
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167 | void nextIn(Edge& edge) const { |
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168 | edge.id = edges[edge.id].next_in; |
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169 | } |
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170 | |
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171 | int id(const Node& node) const { return graph->id(node); } |
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172 | int id(const Edge& edge) const { return edge.id; } |
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173 | |
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174 | Node nodeFromId(int id) const { return graph->fromId(id, Node()); } |
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175 | Edge edgeFromId(int id) const { return Edge(id); } |
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176 | |
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177 | int maxNodeId() const { return graph->maxId(Node()); }; |
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178 | int maxEdgeId() const { return edges.size() - 1; } |
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179 | |
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180 | Node source(const Edge& edge) const { return edges[edge.id].source;} |
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181 | Node target(const Edge& edge) const { return edges[edge.id].target;} |
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182 | |
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183 | template <typename _Value> |
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184 | class NodeMap : public Graph::template NodeMap<_Value> { |
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185 | public: |
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186 | typedef typename _Graph::template NodeMap<_Value> Parent; |
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187 | explicit NodeMap(const ListEdgeSetBase<Graph>& edgeset) |
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188 | : Parent(*edgeset.graph) { } |
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189 | NodeMap(const ListEdgeSetBase<Graph>& edgeset, const _Value& value) |
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190 | : Parent(*edgeset.graph, value) { } |
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191 | }; |
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192 | |
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193 | }; |
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194 | |
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195 | /// \ingroup graphs |
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196 | /// |
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197 | /// \brief Graph using a node set of another graph and an |
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198 | /// own edge set. |
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199 | /// |
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200 | /// This structure can be used to establish another graph over a node set |
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201 | /// of an existing one. The node iterator will go through the nodes of the |
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202 | /// original graph. |
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203 | /// |
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204 | /// \param _Graph The type of the graph which shares its node set with |
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205 | /// this class. Its interface must conform to the \ref concept::StaticGraph |
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206 | /// "StaticGraph" concept. |
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207 | /// |
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208 | /// In the edge extension and removing it conforms to the |
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209 | /// \ref concept::ExtendableGraph "ExtendableGraph" concept. |
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210 | template <typename _Graph> |
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211 | class ListEdgeSet : |
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212 | public ErasableEdgeSetExtender< |
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213 | ClearableEdgeSetExtender< |
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214 | ExtendableEdgeSetExtender< |
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215 | MappableEdgeSetExtender< |
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216 | IterableGraphExtender< |
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217 | AlterableEdgeSetExtender< |
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218 | GraphExtender< |
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219 | ListEdgeSetBase<_Graph> > > > > > > > { |
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220 | |
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221 | public: |
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222 | |
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223 | typedef ErasableEdgeSetExtender< |
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224 | ClearableEdgeSetExtender< |
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225 | ExtendableEdgeSetExtender< |
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226 | MappableEdgeSetExtender< |
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227 | IterableGraphExtender< |
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228 | AlterableEdgeSetExtender< |
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229 | GraphExtender< |
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230 | ListEdgeSetBase<_Graph> > > > > > > > Parent; |
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231 | |
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232 | typedef typename Parent::Node Node; |
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233 | typedef typename Parent::Edge Edge; |
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234 | |
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235 | typedef _Graph Graph; |
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236 | |
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237 | |
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238 | typedef typename Parent::NodesImplBase NodesImplBase; |
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239 | |
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240 | void eraseNode(const Node& node) { |
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241 | Edge edge; |
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242 | Parent::firstOut(edge, node); |
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243 | while (edge != INVALID ) { |
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244 | erase(edge); |
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245 | Parent::firstOut(edge, node); |
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246 | } |
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247 | |
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248 | Parent::firstIn(edge, node); |
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249 | while (edge != INVALID ) { |
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250 | erase(edge); |
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251 | Parent::firstIn(edge, node); |
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252 | } |
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253 | } |
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254 | |
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255 | void clearNodes() { |
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256 | Parent::clear(); |
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257 | } |
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258 | |
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259 | class NodesImpl : public NodesImplBase { |
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260 | public: |
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261 | typedef NodesImplBase Parent; |
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262 | |
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263 | NodesImpl(const Graph& graph, ListEdgeSet& edgeset) |
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264 | : Parent(graph), _edgeset(edgeset) {} |
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265 | |
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266 | protected: |
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267 | |
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268 | virtual void erase(const Node& node) { |
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269 | _edgeset.eraseNode(node); |
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270 | Parent::erase(node); |
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271 | } |
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272 | virtual void clear() { |
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273 | _edgeset.clearNodes(); |
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274 | Parent::clear(); |
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275 | } |
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276 | |
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277 | private: |
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278 | ListEdgeSet& _edgeset; |
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279 | }; |
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280 | |
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281 | NodesImpl nodes; |
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282 | |
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283 | public: |
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284 | |
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285 | /// \brief Constructor of the adaptor. |
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286 | /// |
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287 | /// Constructor of the adaptor. |
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288 | ListEdgeSet(const Graph& graph) : nodes(graph, *this) { |
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289 | Parent::initalize(graph, nodes); |
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290 | } |
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291 | |
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292 | }; |
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293 | |
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294 | /// \ingroup graphs |
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295 | /// |
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296 | /// \brief Graph using a node set of another graph and an |
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297 | /// own undir edge set. |
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298 | /// |
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299 | /// This structure can be used to establish another graph over a node set |
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300 | /// of an existing one. The node iterator will go through the nodes of the |
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301 | /// original graph. |
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302 | /// |
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303 | /// \param _Graph The type of the graph which shares its node set with |
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304 | /// this class. Its interface must conform to the \ref concept::StaticGraph |
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305 | /// "StaticGraph" concept. |
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306 | /// |
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307 | /// In the edge extension and removing it conforms to the |
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308 | /// \ref concept::ExtendableGraph "ExtendableGraph" concept. |
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309 | template <typename _Graph> |
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310 | class ListUndirEdgeSet : |
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311 | public ErasableUndirEdgeSetExtender< |
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312 | ClearableUndirEdgeSetExtender< |
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313 | ExtendableUndirEdgeSetExtender< |
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314 | MappableUndirEdgeSetExtender< |
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315 | IterableUndirGraphExtender< |
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316 | AlterableUndirEdgeSetExtender< |
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317 | UndirGraphExtender< |
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318 | ListEdgeSetBase<_Graph> > > > > > > > { |
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319 | |
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320 | public: |
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321 | |
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322 | typedef ErasableUndirEdgeSetExtender< |
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323 | ClearableUndirEdgeSetExtender< |
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324 | ExtendableUndirEdgeSetExtender< |
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325 | MappableUndirEdgeSetExtender< |
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326 | IterableUndirGraphExtender< |
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327 | AlterableUndirEdgeSetExtender< |
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328 | UndirGraphExtender< |
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329 | ListEdgeSetBase<_Graph> > > > > > > > Parent; |
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330 | |
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331 | typedef typename Parent::Node Node; |
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332 | typedef typename Parent::Edge Edge; |
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333 | |
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334 | typedef _Graph Graph; |
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335 | |
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336 | |
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337 | typedef typename Parent::NodesImplBase NodesImplBase; |
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338 | |
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339 | void eraseNode(const Node& node) { |
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340 | Edge edge; |
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341 | Parent::firstOut(edge, node); |
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342 | while (edge != INVALID ) { |
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343 | erase(edge); |
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344 | Parent::firstOut(edge, node); |
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345 | } |
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346 | |
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347 | } |
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348 | |
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349 | void clearNodes() { |
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350 | Parent::clear(); |
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351 | } |
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352 | |
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353 | class NodesImpl : public NodesImplBase { |
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354 | public: |
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355 | typedef NodesImplBase Parent; |
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356 | |
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357 | NodesImpl(const Graph& graph, ListUndirEdgeSet& edgeset) |
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358 | : Parent(graph), _edgeset(edgeset) {} |
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359 | |
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360 | protected: |
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361 | |
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362 | virtual void erase(const Node& node) { |
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363 | _edgeset.eraseNode(node); |
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364 | Parent::erase(node); |
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365 | } |
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366 | virtual void clear() { |
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367 | _edgeset.clearNodes(); |
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368 | Parent::clear(); |
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369 | } |
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370 | |
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371 | private: |
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372 | ListUndirEdgeSet& _edgeset; |
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373 | }; |
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374 | |
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375 | NodesImpl nodes; |
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376 | |
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377 | public: |
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378 | |
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379 | /// \brief Constructor of the adaptor. |
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380 | /// |
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381 | /// Constructor of the adaptor. |
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382 | ListUndirEdgeSet(const Graph& graph) : nodes(graph, *this) { |
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383 | Parent::initalize(graph, nodes); |
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384 | } |
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385 | |
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386 | }; |
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387 | |
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388 | } |
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389 | |
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390 | #endif |
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