1 | /* -*- mode: C++; indent-tabs-mode: nil; -*- |
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2 | * |
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3 | * This file is a part of LEMON, a generic C++ optimization library. |
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4 | * |
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5 | * Copyright (C) 2003-2008 |
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6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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8 | * |
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9 | * Permission to use, modify and distribute this software is granted |
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10 | * provided that this copyright notice appears in all copies. For |
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11 | * precise terms see the accompanying LICENSE file. |
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12 | * |
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13 | * This software is provided "AS IS" with no warranty of any kind, |
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14 | * express or implied, and with no claim as to its suitability for any |
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15 | * purpose. |
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16 | * |
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17 | */ |
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18 | |
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19 | #ifndef LEMON_EDGE_SET_H |
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20 | #define LEMON_EDGE_SET_H |
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21 | |
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22 | #include <lemon/core.h> |
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23 | #include <lemon/bits/edge_set_extender.h> |
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24 | |
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25 | /// \ingroup semi_adaptors |
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26 | /// \file |
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27 | /// \brief ArcSet and EdgeSet classes. |
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28 | /// |
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29 | /// Graphs which use another graph's node-set as own. |
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30 | namespace lemon { |
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31 | |
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32 | template <typename _Graph> |
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33 | class ListArcSetBase { |
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34 | public: |
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35 | |
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36 | typedef _Graph Graph; |
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37 | typedef typename Graph::Node Node; |
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38 | typedef typename Graph::NodeIt NodeIt; |
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39 | |
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40 | protected: |
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41 | |
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42 | struct NodeT { |
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43 | int first_out, first_in; |
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44 | NodeT() : first_out(-1), first_in(-1) {} |
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45 | }; |
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46 | |
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47 | typedef typename ItemSetTraits<Graph, Node>:: |
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48 | template Map<NodeT>::Type NodesImplBase; |
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49 | |
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50 | NodesImplBase* nodes; |
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51 | |
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52 | struct ArcT { |
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53 | Node source, target; |
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54 | int next_out, next_in; |
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55 | int prev_out, prev_in; |
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56 | ArcT() : prev_out(-1), prev_in(-1) {} |
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57 | }; |
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58 | |
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59 | std::vector<ArcT> arcs; |
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60 | |
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61 | int first_arc; |
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62 | int first_free_arc; |
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63 | |
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64 | const Graph* graph; |
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65 | |
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66 | void initalize(const Graph& _graph, NodesImplBase& _nodes) { |
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67 | graph = &_graph; |
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68 | nodes = &_nodes; |
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69 | } |
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70 | |
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71 | public: |
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72 | |
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73 | class Arc { |
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74 | friend class ListArcSetBase<Graph>; |
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75 | protected: |
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76 | Arc(int _id) : id(_id) {} |
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77 | int id; |
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78 | public: |
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79 | Arc() {} |
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80 | Arc(Invalid) : id(-1) {} |
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81 | bool operator==(const Arc& arc) const { return id == arc.id; } |
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82 | bool operator!=(const Arc& arc) const { return id != arc.id; } |
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83 | bool operator<(const Arc& arc) const { return id < arc.id; } |
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84 | }; |
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85 | |
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86 | ListArcSetBase() : first_arc(-1), first_free_arc(-1) {} |
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87 | |
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88 | Arc addArc(const Node& u, const Node& v) { |
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89 | int n; |
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90 | if (first_free_arc == -1) { |
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91 | n = arcs.size(); |
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92 | arcs.push_back(ArcT()); |
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93 | } else { |
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94 | n = first_free_arc; |
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95 | first_free_arc = arcs[first_free_arc].next_in; |
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96 | } |
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97 | arcs[n].next_in = (*nodes)[v].first_in; |
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98 | if ((*nodes)[v].first_in != -1) { |
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99 | arcs[(*nodes)[v].first_in].prev_in = n; |
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100 | } |
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101 | (*nodes)[v].first_in = n; |
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102 | arcs[n].next_out = (*nodes)[u].first_out; |
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103 | if ((*nodes)[u].first_out != -1) { |
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104 | arcs[(*nodes)[u].first_out].prev_out = n; |
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105 | } |
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106 | (*nodes)[u].first_out = n; |
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107 | arcs[n].source = u; |
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108 | arcs[n].target = v; |
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109 | return Arc(n); |
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110 | } |
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111 | |
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112 | void erase(const Arc& arc) { |
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113 | int n = arc.id; |
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114 | if (arcs[n].prev_in != -1) { |
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115 | arcs[arcs[n].prev_in].next_in = arcs[n].next_in; |
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116 | } else { |
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117 | (*nodes)[arcs[n].target].first_in = arcs[n].next_in; |
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118 | } |
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119 | if (arcs[n].next_in != -1) { |
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120 | arcs[arcs[n].next_in].prev_in = arcs[n].prev_in; |
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121 | } |
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122 | |
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123 | if (arcs[n].prev_out != -1) { |
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124 | arcs[arcs[n].prev_out].next_out = arcs[n].next_out; |
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125 | } else { |
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126 | (*nodes)[arcs[n].source].first_out = arcs[n].next_out; |
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127 | } |
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128 | if (arcs[n].next_out != -1) { |
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129 | arcs[arcs[n].next_out].prev_out = arcs[n].prev_out; |
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130 | } |
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131 | |
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132 | } |
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133 | |
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134 | void clear() { |
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135 | Node node; |
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136 | for (first(node); node != INVALID; next(node)) { |
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137 | (*nodes)[node].first_in = -1; |
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138 | (*nodes)[node].first_out = -1; |
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139 | } |
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140 | arcs.clear(); |
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141 | first_arc = -1; |
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142 | first_free_arc = -1; |
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143 | } |
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144 | |
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145 | void first(Node& node) const { |
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146 | graph->first(node); |
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147 | } |
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148 | |
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149 | void next(Node& node) const { |
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150 | graph->next(node); |
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151 | } |
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152 | |
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153 | void first(Arc& arc) const { |
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154 | Node node; |
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155 | first(node); |
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156 | while (node != INVALID && (*nodes)[node].first_in == -1) { |
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157 | next(node); |
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158 | } |
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159 | arc.id = (node == INVALID) ? -1 : (*nodes)[node].first_in; |
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160 | } |
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161 | |
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162 | void next(Arc& arc) const { |
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163 | if (arcs[arc.id].next_in != -1) { |
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164 | arc.id = arcs[arc.id].next_in; |
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165 | } else { |
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166 | Node node = arcs[arc.id].target; |
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167 | next(node); |
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168 | while (node != INVALID && (*nodes)[node].first_in == -1) { |
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169 | next(node); |
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170 | } |
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171 | arc.id = (node == INVALID) ? -1 : (*nodes)[node].first_in; |
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172 | } |
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173 | } |
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174 | |
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175 | void firstOut(Arc& arc, const Node& node) const { |
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176 | arc.id = (*nodes)[node].first_out; |
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177 | } |
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178 | |
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179 | void nextOut(Arc& arc) const { |
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180 | arc.id = arcs[arc.id].next_out; |
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181 | } |
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182 | |
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183 | void firstIn(Arc& arc, const Node& node) const { |
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184 | arc.id = (*nodes)[node].first_in; |
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185 | } |
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186 | |
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187 | void nextIn(Arc& arc) const { |
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188 | arc.id = arcs[arc.id].next_in; |
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189 | } |
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190 | |
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191 | int id(const Node& node) const { return graph->id(node); } |
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192 | int id(const Arc& arc) const { return arc.id; } |
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193 | |
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194 | Node nodeFromId(int ix) const { return graph->nodeFromId(ix); } |
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195 | Arc arcFromId(int ix) const { return Arc(ix); } |
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196 | |
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197 | int maxNodeId() const { return graph->maxNodeId(); }; |
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198 | int maxArcId() const { return arcs.size() - 1; } |
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199 | |
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200 | Node source(const Arc& arc) const { return arcs[arc.id].source;} |
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201 | Node target(const Arc& arc) const { return arcs[arc.id].target;} |
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202 | |
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203 | typedef typename ItemSetTraits<Graph, Node>::ItemNotifier NodeNotifier; |
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204 | |
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205 | NodeNotifier& notifier(Node) const { |
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206 | return graph->notifier(Node()); |
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207 | } |
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208 | |
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209 | template <typename _Value> |
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210 | class NodeMap : public Graph::template NodeMap<_Value> { |
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211 | public: |
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212 | |
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213 | typedef typename _Graph::template NodeMap<_Value> Parent; |
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214 | |
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215 | explicit NodeMap(const ListArcSetBase<Graph>& arcset) |
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216 | : Parent(*arcset.graph) {} |
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217 | |
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218 | NodeMap(const ListArcSetBase<Graph>& arcset, const _Value& value) |
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219 | : Parent(*arcset.graph, value) {} |
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220 | |
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221 | NodeMap& operator=(const NodeMap& cmap) { |
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222 | return operator=<NodeMap>(cmap); |
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223 | } |
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224 | |
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225 | template <typename CMap> |
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226 | NodeMap& operator=(const CMap& cmap) { |
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227 | Parent::operator=(cmap); |
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228 | return *this; |
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229 | } |
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230 | }; |
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231 | |
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232 | }; |
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233 | |
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234 | /// \ingroup semi_adaptors |
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235 | /// |
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236 | /// \brief Digraph using a node set of another digraph or graph and |
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237 | /// an own arc set. |
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238 | /// |
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239 | /// This structure can be used to establish another directed graph |
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240 | /// over a node set of an existing one. This class uses the same |
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241 | /// Node type as the underlying graph, and each valid node of the |
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242 | /// original graph is valid in this arc set, therefore the node |
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243 | /// objects of the original graph can be used directly with this |
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244 | /// class. The node handling functions (id handling, observing, and |
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245 | /// iterators) works equivalently as in the original graph. |
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246 | /// |
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247 | /// This implementation is based on doubly-linked lists, from each |
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248 | /// node the outgoing and the incoming arcs make up lists, therefore |
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249 | /// one arc can be erased in constant time. It also makes possible, |
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250 | /// that node can be removed from the underlying graph, in this case |
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251 | /// all arcs incident to the given node is erased from the arc set. |
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252 | /// |
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253 | /// \param _Graph The type of the graph which shares its node set with |
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254 | /// this class. Its interface must conform to the |
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255 | /// \ref concepts::Digraph "Digraph" or \ref concepts::Graph "Graph" |
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256 | /// concept. |
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257 | /// |
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258 | /// This class is fully conform to the \ref concepts::Digraph |
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259 | /// "Digraph" concept. |
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260 | template <typename _Graph> |
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261 | class ListArcSet : public ArcSetExtender<ListArcSetBase<_Graph> > { |
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262 | |
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263 | public: |
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264 | |
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265 | typedef ArcSetExtender<ListArcSetBase<_Graph> > Parent; |
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266 | |
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267 | typedef typename Parent::Node Node; |
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268 | typedef typename Parent::Arc Arc; |
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269 | |
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270 | typedef _Graph Graph; |
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271 | |
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272 | |
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273 | typedef typename Parent::NodesImplBase NodesImplBase; |
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274 | |
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275 | void eraseNode(const Node& node) { |
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276 | Arc arc; |
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277 | Parent::firstOut(arc, node); |
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278 | while (arc != INVALID ) { |
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279 | erase(arc); |
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280 | Parent::firstOut(arc, node); |
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281 | } |
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282 | |
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283 | Parent::firstIn(arc, node); |
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284 | while (arc != INVALID ) { |
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285 | erase(arc); |
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286 | Parent::firstIn(arc, node); |
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287 | } |
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288 | } |
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289 | |
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290 | void clearNodes() { |
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291 | Parent::clear(); |
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292 | } |
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293 | |
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294 | class NodesImpl : public NodesImplBase { |
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295 | public: |
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296 | typedef NodesImplBase Parent; |
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297 | |
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298 | NodesImpl(const Graph& graph, ListArcSet& arcset) |
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299 | : Parent(graph), _arcset(arcset) {} |
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300 | |
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301 | virtual ~NodesImpl() {} |
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302 | |
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303 | protected: |
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304 | |
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305 | virtual void erase(const Node& node) { |
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306 | _arcset.eraseNode(node); |
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307 | Parent::erase(node); |
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308 | } |
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309 | virtual void erase(const std::vector<Node>& nodes) { |
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310 | for (int i = 0; i < int(nodes.size()); ++i) { |
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311 | _arcset.eraseNode(nodes[i]); |
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312 | } |
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313 | Parent::erase(nodes); |
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314 | } |
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315 | virtual void clear() { |
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316 | _arcset.clearNodes(); |
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317 | Parent::clear(); |
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318 | } |
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319 | |
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320 | private: |
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321 | ListArcSet& _arcset; |
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322 | }; |
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323 | |
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324 | NodesImpl nodes; |
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325 | |
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326 | public: |
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327 | |
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328 | /// \brief Constructor of the ArcSet. |
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329 | /// |
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330 | /// Constructor of the ArcSet. |
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331 | ListArcSet(const Graph& graph) : nodes(graph, *this) { |
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332 | Parent::initalize(graph, nodes); |
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333 | } |
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334 | |
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335 | /// \brief Add a new arc to the digraph. |
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336 | /// |
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337 | /// Add a new arc to the digraph with source node \c s |
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338 | /// and target node \c t. |
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339 | /// \return the new arc. |
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340 | Arc addArc(const Node& s, const Node& t) { |
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341 | return Parent::addArc(s, t); |
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342 | } |
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343 | |
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344 | /// \brief Erase an arc from the digraph. |
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345 | /// |
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346 | /// Erase an arc \c a from the digraph. |
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347 | void erase(const Arc& a) { |
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348 | return Parent::erase(a); |
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349 | } |
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350 | |
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351 | }; |
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352 | |
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353 | template <typename _Graph> |
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354 | class ListEdgeSetBase { |
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355 | public: |
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356 | |
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357 | typedef _Graph Graph; |
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358 | typedef typename Graph::Node Node; |
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359 | typedef typename Graph::NodeIt NodeIt; |
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360 | |
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361 | protected: |
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362 | |
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363 | struct NodeT { |
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364 | int first_out; |
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365 | NodeT() : first_out(-1) {} |
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366 | }; |
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367 | |
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368 | typedef typename ItemSetTraits<Graph, Node>:: |
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369 | template Map<NodeT>::Type NodesImplBase; |
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370 | |
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371 | NodesImplBase* nodes; |
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372 | |
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373 | struct ArcT { |
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374 | Node target; |
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375 | int prev_out, next_out; |
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376 | ArcT() : prev_out(-1), next_out(-1) {} |
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377 | }; |
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378 | |
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379 | std::vector<ArcT> arcs; |
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380 | |
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381 | int first_arc; |
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382 | int first_free_arc; |
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383 | |
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384 | const Graph* graph; |
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385 | |
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386 | void initalize(const Graph& _graph, NodesImplBase& _nodes) { |
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387 | graph = &_graph; |
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388 | nodes = &_nodes; |
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389 | } |
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390 | |
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391 | public: |
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392 | |
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393 | class Edge { |
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394 | friend class ListEdgeSetBase; |
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395 | protected: |
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396 | |
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397 | int id; |
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398 | explicit Edge(int _id) { id = _id;} |
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399 | |
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400 | public: |
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401 | Edge() {} |
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402 | Edge (Invalid) { id = -1; } |
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403 | bool operator==(const Edge& arc) const {return id == arc.id;} |
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404 | bool operator!=(const Edge& arc) const {return id != arc.id;} |
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405 | bool operator<(const Edge& arc) const {return id < arc.id;} |
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406 | }; |
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407 | |
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408 | class Arc { |
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409 | friend class ListEdgeSetBase; |
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410 | protected: |
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411 | Arc(int _id) : id(_id) {} |
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412 | int id; |
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413 | public: |
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414 | operator Edge() const { return edgeFromId(id / 2); } |
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415 | |
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416 | Arc() {} |
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417 | Arc(Invalid) : id(-1) {} |
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418 | bool operator==(const Arc& arc) const { return id == arc.id; } |
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419 | bool operator!=(const Arc& arc) const { return id != arc.id; } |
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420 | bool operator<(const Arc& arc) const { return id < arc.id; } |
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421 | }; |
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422 | |
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423 | ListEdgeSetBase() : first_arc(-1), first_free_arc(-1) {} |
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424 | |
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425 | Edge addEdge(const Node& u, const Node& v) { |
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426 | int n; |
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427 | |
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428 | if (first_free_arc == -1) { |
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429 | n = arcs.size(); |
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430 | arcs.push_back(ArcT()); |
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431 | arcs.push_back(ArcT()); |
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432 | } else { |
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433 | n = first_free_arc; |
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434 | first_free_arc = arcs[n].next_out; |
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435 | } |
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436 | |
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437 | arcs[n].target = u; |
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438 | arcs[n | 1].target = v; |
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439 | |
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440 | arcs[n].next_out = (*nodes)[v].first_out; |
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441 | if ((*nodes)[v].first_out != -1) { |
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442 | arcs[(*nodes)[v].first_out].prev_out = n; |
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443 | } |
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444 | (*nodes)[v].first_out = n; |
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445 | arcs[n].prev_out = -1; |
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446 | |
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447 | if ((*nodes)[u].first_out != -1) { |
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448 | arcs[(*nodes)[u].first_out].prev_out = (n | 1); |
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449 | } |
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450 | arcs[n | 1].next_out = (*nodes)[u].first_out; |
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451 | (*nodes)[u].first_out = (n | 1); |
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452 | arcs[n | 1].prev_out = -1; |
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453 | |
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454 | return Edge(n / 2); |
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455 | } |
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456 | |
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457 | void erase(const Edge& arc) { |
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458 | int n = arc.id * 2; |
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459 | |
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460 | if (arcs[n].next_out != -1) { |
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461 | arcs[arcs[n].next_out].prev_out = arcs[n].prev_out; |
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462 | } |
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463 | |
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464 | if (arcs[n].prev_out != -1) { |
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465 | arcs[arcs[n].prev_out].next_out = arcs[n].next_out; |
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466 | } else { |
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467 | (*nodes)[arcs[n | 1].target].first_out = arcs[n].next_out; |
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468 | } |
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469 | |
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470 | if (arcs[n | 1].next_out != -1) { |
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471 | arcs[arcs[n | 1].next_out].prev_out = arcs[n | 1].prev_out; |
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472 | } |
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473 | |
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474 | if (arcs[n | 1].prev_out != -1) { |
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475 | arcs[arcs[n | 1].prev_out].next_out = arcs[n | 1].next_out; |
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476 | } else { |
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477 | (*nodes)[arcs[n].target].first_out = arcs[n | 1].next_out; |
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478 | } |
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479 | |
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480 | arcs[n].next_out = first_free_arc; |
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481 | first_free_arc = n; |
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482 | |
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483 | } |
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484 | |
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485 | void clear() { |
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486 | Node node; |
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487 | for (first(node); node != INVALID; next(node)) { |
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488 | (*nodes)[node].first_out = -1; |
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489 | } |
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490 | arcs.clear(); |
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491 | first_arc = -1; |
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492 | first_free_arc = -1; |
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493 | } |
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494 | |
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495 | void first(Node& node) const { |
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496 | graph->first(node); |
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497 | } |
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498 | |
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499 | void next(Node& node) const { |
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500 | graph->next(node); |
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501 | } |
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502 | |
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503 | void first(Arc& arc) const { |
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504 | Node node; |
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505 | first(node); |
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506 | while (node != INVALID && (*nodes)[node].first_out == -1) { |
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507 | next(node); |
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508 | } |
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509 | arc.id = (node == INVALID) ? -1 : (*nodes)[node].first_out; |
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510 | } |
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511 | |
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512 | void next(Arc& arc) const { |
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513 | if (arcs[arc.id].next_out != -1) { |
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514 | arc.id = arcs[arc.id].next_out; |
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515 | } else { |
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516 | Node node = arcs[arc.id ^ 1].target; |
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517 | next(node); |
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518 | while(node != INVALID && (*nodes)[node].first_out == -1) { |
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519 | next(node); |
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520 | } |
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521 | arc.id = (node == INVALID) ? -1 : (*nodes)[node].first_out; |
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522 | } |
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523 | } |
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524 | |
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525 | void first(Edge& edge) const { |
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526 | Node node; |
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527 | first(node); |
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528 | while (node != INVALID) { |
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529 | edge.id = (*nodes)[node].first_out; |
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530 | while ((edge.id & 1) != 1) { |
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531 | edge.id = arcs[edge.id].next_out; |
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532 | } |
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533 | if (edge.id != -1) { |
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534 | edge.id /= 2; |
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535 | return; |
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536 | } |
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537 | next(node); |
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538 | } |
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539 | edge.id = -1; |
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540 | } |
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541 | |
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542 | void next(Edge& edge) const { |
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543 | Node node = arcs[edge.id * 2].target; |
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544 | edge.id = arcs[(edge.id * 2) | 1].next_out; |
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545 | while ((edge.id & 1) != 1) { |
---|
546 | edge.id = arcs[edge.id].next_out; |
---|
547 | } |
---|
548 | if (edge.id != -1) { |
---|
549 | edge.id /= 2; |
---|
550 | return; |
---|
551 | } |
---|
552 | next(node); |
---|
553 | while (node != INVALID) { |
---|
554 | edge.id = (*nodes)[node].first_out; |
---|
555 | while ((edge.id & 1) != 1) { |
---|
556 | edge.id = arcs[edge.id].next_out; |
---|
557 | } |
---|
558 | if (edge.id != -1) { |
---|
559 | edge.id /= 2; |
---|
560 | return; |
---|
561 | } |
---|
562 | next(node); |
---|
563 | } |
---|
564 | edge.id = -1; |
---|
565 | } |
---|
566 | |
---|
567 | void firstOut(Arc& arc, const Node& node) const { |
---|
568 | arc.id = (*nodes)[node].first_out; |
---|
569 | } |
---|
570 | |
---|
571 | void nextOut(Arc& arc) const { |
---|
572 | arc.id = arcs[arc.id].next_out; |
---|
573 | } |
---|
574 | |
---|
575 | void firstIn(Arc& arc, const Node& node) const { |
---|
576 | arc.id = (((*nodes)[node].first_out) ^ 1); |
---|
577 | if (arc.id == -2) arc.id = -1; |
---|
578 | } |
---|
579 | |
---|
580 | void nextIn(Arc& arc) const { |
---|
581 | arc.id = ((arcs[arc.id ^ 1].next_out) ^ 1); |
---|
582 | if (arc.id == -2) arc.id = -1; |
---|
583 | } |
---|
584 | |
---|
585 | void firstInc(Edge &arc, bool& dir, const Node& node) const { |
---|
586 | int de = (*nodes)[node].first_out; |
---|
587 | if (de != -1 ) { |
---|
588 | arc.id = de / 2; |
---|
589 | dir = ((de & 1) == 1); |
---|
590 | } else { |
---|
591 | arc.id = -1; |
---|
592 | dir = true; |
---|
593 | } |
---|
594 | } |
---|
595 | void nextInc(Edge &arc, bool& dir) const { |
---|
596 | int de = (arcs[(arc.id * 2) | (dir ? 1 : 0)].next_out); |
---|
597 | if (de != -1 ) { |
---|
598 | arc.id = de / 2; |
---|
599 | dir = ((de & 1) == 1); |
---|
600 | } else { |
---|
601 | arc.id = -1; |
---|
602 | dir = true; |
---|
603 | } |
---|
604 | } |
---|
605 | |
---|
606 | static bool direction(Arc arc) { |
---|
607 | return (arc.id & 1) == 1; |
---|
608 | } |
---|
609 | |
---|
610 | static Arc direct(Edge edge, bool dir) { |
---|
611 | return Arc(edge.id * 2 + (dir ? 1 : 0)); |
---|
612 | } |
---|
613 | |
---|
614 | int id(const Node& node) const { return graph->id(node); } |
---|
615 | static int id(Arc e) { return e.id; } |
---|
616 | static int id(Edge e) { return e.id; } |
---|
617 | |
---|
618 | Node nodeFromId(int id) const { return graph->nodeFromId(id); } |
---|
619 | static Arc arcFromId(int id) { return Arc(id);} |
---|
620 | static Edge edgeFromId(int id) { return Edge(id);} |
---|
621 | |
---|
622 | int maxNodeId() const { return graph->maxNodeId(); }; |
---|
623 | int maxEdgeId() const { return arcs.size() / 2 - 1; } |
---|
624 | int maxArcId() const { return arcs.size()-1; } |
---|
625 | |
---|
626 | Node source(Arc e) const { return arcs[e.id ^ 1].target; } |
---|
627 | Node target(Arc e) const { return arcs[e.id].target; } |
---|
628 | |
---|
629 | Node u(Edge e) const { return arcs[2 * e.id].target; } |
---|
630 | Node v(Edge e) const { return arcs[2 * e.id + 1].target; } |
---|
631 | |
---|
632 | typedef typename ItemSetTraits<Graph, Node>::ItemNotifier NodeNotifier; |
---|
633 | |
---|
634 | NodeNotifier& notifier(Node) const { |
---|
635 | return graph->notifier(Node()); |
---|
636 | } |
---|
637 | |
---|
638 | template <typename _Value> |
---|
639 | class NodeMap : public Graph::template NodeMap<_Value> { |
---|
640 | public: |
---|
641 | |
---|
642 | typedef typename _Graph::template NodeMap<_Value> Parent; |
---|
643 | |
---|
644 | explicit NodeMap(const ListEdgeSetBase<Graph>& arcset) |
---|
645 | : Parent(*arcset.graph) {} |
---|
646 | |
---|
647 | NodeMap(const ListEdgeSetBase<Graph>& arcset, const _Value& value) |
---|
648 | : Parent(*arcset.graph, value) {} |
---|
649 | |
---|
650 | NodeMap& operator=(const NodeMap& cmap) { |
---|
651 | return operator=<NodeMap>(cmap); |
---|
652 | } |
---|
653 | |
---|
654 | template <typename CMap> |
---|
655 | NodeMap& operator=(const CMap& cmap) { |
---|
656 | Parent::operator=(cmap); |
---|
657 | return *this; |
---|
658 | } |
---|
659 | }; |
---|
660 | |
---|
661 | }; |
---|
662 | |
---|
663 | /// \ingroup semi_adaptors |
---|
664 | /// |
---|
665 | /// \brief Graph using a node set of another digraph or graph and an |
---|
666 | /// own edge set. |
---|
667 | /// |
---|
668 | /// This structure can be used to establish another graph over a |
---|
669 | /// node set of an existing one. This class uses the same Node type |
---|
670 | /// as the underlying graph, and each valid node of the original |
---|
671 | /// graph is valid in this arc set, therefore the node objects of |
---|
672 | /// the original graph can be used directly with this class. The |
---|
673 | /// node handling functions (id handling, observing, and iterators) |
---|
674 | /// works equivalently as in the original graph. |
---|
675 | /// |
---|
676 | /// This implementation is based on doubly-linked lists, from each |
---|
677 | /// node the incident edges make up lists, therefore one edge can be |
---|
678 | /// erased in constant time. It also makes possible, that node can |
---|
679 | /// be removed from the underlying graph, in this case all edges |
---|
680 | /// incident to the given node is erased from the arc set. |
---|
681 | /// |
---|
682 | /// \param _Graph The type of the graph which shares its node set |
---|
683 | /// with this class. Its interface must conform to the |
---|
684 | /// \ref concepts::Digraph "Digraph" or \ref concepts::Graph "Graph" |
---|
685 | /// concept. |
---|
686 | /// |
---|
687 | /// This class is fully conform to the \ref concepts::Graph "Graph" |
---|
688 | /// concept. |
---|
689 | template <typename _Graph> |
---|
690 | class ListEdgeSet : public EdgeSetExtender<ListEdgeSetBase<_Graph> > { |
---|
691 | |
---|
692 | public: |
---|
693 | |
---|
694 | typedef EdgeSetExtender<ListEdgeSetBase<_Graph> > Parent; |
---|
695 | |
---|
696 | typedef typename Parent::Node Node; |
---|
697 | typedef typename Parent::Arc Arc; |
---|
698 | typedef typename Parent::Edge Edge; |
---|
699 | |
---|
700 | typedef _Graph Graph; |
---|
701 | |
---|
702 | |
---|
703 | typedef typename Parent::NodesImplBase NodesImplBase; |
---|
704 | |
---|
705 | void eraseNode(const Node& node) { |
---|
706 | Arc arc; |
---|
707 | Parent::firstOut(arc, node); |
---|
708 | while (arc != INVALID ) { |
---|
709 | erase(arc); |
---|
710 | Parent::firstOut(arc, node); |
---|
711 | } |
---|
712 | |
---|
713 | } |
---|
714 | |
---|
715 | void clearNodes() { |
---|
716 | Parent::clear(); |
---|
717 | } |
---|
718 | |
---|
719 | class NodesImpl : public NodesImplBase { |
---|
720 | public: |
---|
721 | typedef NodesImplBase Parent; |
---|
722 | |
---|
723 | NodesImpl(const Graph& graph, ListEdgeSet& arcset) |
---|
724 | : Parent(graph), _arcset(arcset) {} |
---|
725 | |
---|
726 | virtual ~NodesImpl() {} |
---|
727 | |
---|
728 | protected: |
---|
729 | |
---|
730 | virtual void erase(const Node& node) { |
---|
731 | _arcset.eraseNode(node); |
---|
732 | Parent::erase(node); |
---|
733 | } |
---|
734 | virtual void erase(const std::vector<Node>& nodes) { |
---|
735 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
736 | _arcset.eraseNode(nodes[i]); |
---|
737 | } |
---|
738 | Parent::erase(nodes); |
---|
739 | } |
---|
740 | virtual void clear() { |
---|
741 | _arcset.clearNodes(); |
---|
742 | Parent::clear(); |
---|
743 | } |
---|
744 | |
---|
745 | private: |
---|
746 | ListEdgeSet& _arcset; |
---|
747 | }; |
---|
748 | |
---|
749 | NodesImpl nodes; |
---|
750 | |
---|
751 | public: |
---|
752 | |
---|
753 | /// \brief Constructor of the EdgeSet. |
---|
754 | /// |
---|
755 | /// Constructor of the EdgeSet. |
---|
756 | ListEdgeSet(const Graph& graph) : nodes(graph, *this) { |
---|
757 | Parent::initalize(graph, nodes); |
---|
758 | } |
---|
759 | |
---|
760 | /// \brief Add a new edge to the graph. |
---|
761 | /// |
---|
762 | /// Add a new edge to the graph with node \c u |
---|
763 | /// and node \c v endpoints. |
---|
764 | /// \return the new edge. |
---|
765 | Edge addEdge(const Node& u, const Node& v) { |
---|
766 | return Parent::addEdge(u, v); |
---|
767 | } |
---|
768 | |
---|
769 | /// \brief Erase an edge from the graph. |
---|
770 | /// |
---|
771 | /// Erase the edge \c e from the graph. |
---|
772 | void erase(const Edge& e) { |
---|
773 | return Parent::erase(e); |
---|
774 | } |
---|
775 | |
---|
776 | }; |
---|
777 | |
---|
778 | template <typename _Graph> |
---|
779 | class SmartArcSetBase { |
---|
780 | public: |
---|
781 | |
---|
782 | typedef _Graph Graph; |
---|
783 | typedef typename Graph::Node Node; |
---|
784 | typedef typename Graph::NodeIt NodeIt; |
---|
785 | |
---|
786 | protected: |
---|
787 | |
---|
788 | struct NodeT { |
---|
789 | int first_out, first_in; |
---|
790 | NodeT() : first_out(-1), first_in(-1) {} |
---|
791 | }; |
---|
792 | |
---|
793 | typedef typename ItemSetTraits<Graph, Node>:: |
---|
794 | template Map<NodeT>::Type NodesImplBase; |
---|
795 | |
---|
796 | NodesImplBase* nodes; |
---|
797 | |
---|
798 | struct ArcT { |
---|
799 | Node source, target; |
---|
800 | int next_out, next_in; |
---|
801 | ArcT() {} |
---|
802 | }; |
---|
803 | |
---|
804 | std::vector<ArcT> arcs; |
---|
805 | |
---|
806 | const Graph* graph; |
---|
807 | |
---|
808 | void initalize(const Graph& _graph, NodesImplBase& _nodes) { |
---|
809 | graph = &_graph; |
---|
810 | nodes = &_nodes; |
---|
811 | } |
---|
812 | |
---|
813 | public: |
---|
814 | |
---|
815 | class Arc { |
---|
816 | friend class SmartArcSetBase<Graph>; |
---|
817 | protected: |
---|
818 | Arc(int _id) : id(_id) {} |
---|
819 | int id; |
---|
820 | public: |
---|
821 | Arc() {} |
---|
822 | Arc(Invalid) : id(-1) {} |
---|
823 | bool operator==(const Arc& arc) const { return id == arc.id; } |
---|
824 | bool operator!=(const Arc& arc) const { return id != arc.id; } |
---|
825 | bool operator<(const Arc& arc) const { return id < arc.id; } |
---|
826 | }; |
---|
827 | |
---|
828 | SmartArcSetBase() {} |
---|
829 | |
---|
830 | Arc addArc(const Node& u, const Node& v) { |
---|
831 | int n = arcs.size(); |
---|
832 | arcs.push_back(ArcT()); |
---|
833 | arcs[n].next_in = (*nodes)[v].first_in; |
---|
834 | (*nodes)[v].first_in = n; |
---|
835 | arcs[n].next_out = (*nodes)[u].first_out; |
---|
836 | (*nodes)[u].first_out = n; |
---|
837 | arcs[n].source = u; |
---|
838 | arcs[n].target = v; |
---|
839 | return Arc(n); |
---|
840 | } |
---|
841 | |
---|
842 | void clear() { |
---|
843 | Node node; |
---|
844 | for (first(node); node != INVALID; next(node)) { |
---|
845 | (*nodes)[node].first_in = -1; |
---|
846 | (*nodes)[node].first_out = -1; |
---|
847 | } |
---|
848 | arcs.clear(); |
---|
849 | } |
---|
850 | |
---|
851 | void first(Node& node) const { |
---|
852 | graph->first(node); |
---|
853 | } |
---|
854 | |
---|
855 | void next(Node& node) const { |
---|
856 | graph->next(node); |
---|
857 | } |
---|
858 | |
---|
859 | void first(Arc& arc) const { |
---|
860 | arc.id = arcs.size() - 1; |
---|
861 | } |
---|
862 | |
---|
863 | void next(Arc& arc) const { |
---|
864 | --arc.id; |
---|
865 | } |
---|
866 | |
---|
867 | void firstOut(Arc& arc, const Node& node) const { |
---|
868 | arc.id = (*nodes)[node].first_out; |
---|
869 | } |
---|
870 | |
---|
871 | void nextOut(Arc& arc) const { |
---|
872 | arc.id = arcs[arc.id].next_out; |
---|
873 | } |
---|
874 | |
---|
875 | void firstIn(Arc& arc, const Node& node) const { |
---|
876 | arc.id = (*nodes)[node].first_in; |
---|
877 | } |
---|
878 | |
---|
879 | void nextIn(Arc& arc) const { |
---|
880 | arc.id = arcs[arc.id].next_in; |
---|
881 | } |
---|
882 | |
---|
883 | int id(const Node& node) const { return graph->id(node); } |
---|
884 | int id(const Arc& arc) const { return arc.id; } |
---|
885 | |
---|
886 | Node nodeFromId(int ix) const { return graph->nodeFromId(ix); } |
---|
887 | Arc arcFromId(int ix) const { return Arc(ix); } |
---|
888 | |
---|
889 | int maxNodeId() const { return graph->maxNodeId(); }; |
---|
890 | int maxArcId() const { return arcs.size() - 1; } |
---|
891 | |
---|
892 | Node source(const Arc& arc) const { return arcs[arc.id].source;} |
---|
893 | Node target(const Arc& arc) const { return arcs[arc.id].target;} |
---|
894 | |
---|
895 | typedef typename ItemSetTraits<Graph, Node>::ItemNotifier NodeNotifier; |
---|
896 | |
---|
897 | NodeNotifier& notifier(Node) const { |
---|
898 | return graph->notifier(Node()); |
---|
899 | } |
---|
900 | |
---|
901 | template <typename _Value> |
---|
902 | class NodeMap : public Graph::template NodeMap<_Value> { |
---|
903 | public: |
---|
904 | |
---|
905 | typedef typename _Graph::template NodeMap<_Value> Parent; |
---|
906 | |
---|
907 | explicit NodeMap(const SmartArcSetBase<Graph>& arcset) |
---|
908 | : Parent(*arcset.graph) { } |
---|
909 | |
---|
910 | NodeMap(const SmartArcSetBase<Graph>& arcset, const _Value& value) |
---|
911 | : Parent(*arcset.graph, value) { } |
---|
912 | |
---|
913 | NodeMap& operator=(const NodeMap& cmap) { |
---|
914 | return operator=<NodeMap>(cmap); |
---|
915 | } |
---|
916 | |
---|
917 | template <typename CMap> |
---|
918 | NodeMap& operator=(const CMap& cmap) { |
---|
919 | Parent::operator=(cmap); |
---|
920 | return *this; |
---|
921 | } |
---|
922 | }; |
---|
923 | |
---|
924 | }; |
---|
925 | |
---|
926 | |
---|
927 | /// \ingroup semi_adaptors |
---|
928 | /// |
---|
929 | /// \brief Digraph using a node set of another digraph or graph and |
---|
930 | /// an own arc set. |
---|
931 | /// |
---|
932 | /// This structure can be used to establish another directed graph |
---|
933 | /// over a node set of an existing one. This class uses the same |
---|
934 | /// Node type as the underlying graph, and each valid node of the |
---|
935 | /// original graph is valid in this arc set, therefore the node |
---|
936 | /// objects of the original graph can be used directly with this |
---|
937 | /// class. The node handling functions (id handling, observing, and |
---|
938 | /// iterators) works equivalently as in the original graph. |
---|
939 | /// |
---|
940 | /// \param _Graph The type of the graph which shares its node set with |
---|
941 | /// this class. Its interface must conform to the |
---|
942 | /// \ref concepts::Digraph "Digraph" or \ref concepts::Graph "Graph" |
---|
943 | /// concept. |
---|
944 | /// |
---|
945 | /// This implementation is slightly faster than the \c ListArcSet, |
---|
946 | /// because it uses continuous storage for arcs and it uses just |
---|
947 | /// single-linked lists for enumerate outgoing and incoming |
---|
948 | /// arcs. Therefore the arcs cannot be erased from the arc sets. |
---|
949 | /// |
---|
950 | /// \warning If a node is erased from the underlying graph and this |
---|
951 | /// node is the source or target of one arc in the arc set, then |
---|
952 | /// the arc set is invalidated, and it cannot be used anymore. The |
---|
953 | /// validity can be checked with the \c valid() member function. |
---|
954 | /// |
---|
955 | /// This class is fully conform to the \ref concepts::Digraph |
---|
956 | /// "Digraph" concept. |
---|
957 | template <typename _Graph> |
---|
958 | class SmartArcSet : public ArcSetExtender<SmartArcSetBase<_Graph> > { |
---|
959 | |
---|
960 | public: |
---|
961 | |
---|
962 | typedef ArcSetExtender<SmartArcSetBase<_Graph> > Parent; |
---|
963 | |
---|
964 | typedef typename Parent::Node Node; |
---|
965 | typedef typename Parent::Arc Arc; |
---|
966 | |
---|
967 | typedef _Graph Graph; |
---|
968 | |
---|
969 | protected: |
---|
970 | |
---|
971 | typedef typename Parent::NodesImplBase NodesImplBase; |
---|
972 | |
---|
973 | void eraseNode(const Node& node) { |
---|
974 | if (typename Parent::InArcIt(*this, node) == INVALID && |
---|
975 | typename Parent::OutArcIt(*this, node) == INVALID) { |
---|
976 | return; |
---|
977 | } |
---|
978 | throw typename NodesImplBase::Notifier::ImmediateDetach(); |
---|
979 | } |
---|
980 | |
---|
981 | void clearNodes() { |
---|
982 | Parent::clear(); |
---|
983 | } |
---|
984 | |
---|
985 | class NodesImpl : public NodesImplBase { |
---|
986 | public: |
---|
987 | typedef NodesImplBase Parent; |
---|
988 | |
---|
989 | NodesImpl(const Graph& graph, SmartArcSet& arcset) |
---|
990 | : Parent(graph), _arcset(arcset) {} |
---|
991 | |
---|
992 | virtual ~NodesImpl() {} |
---|
993 | |
---|
994 | bool attached() const { |
---|
995 | return Parent::attached(); |
---|
996 | } |
---|
997 | |
---|
998 | protected: |
---|
999 | |
---|
1000 | virtual void erase(const Node& node) { |
---|
1001 | try { |
---|
1002 | _arcset.eraseNode(node); |
---|
1003 | Parent::erase(node); |
---|
1004 | } catch (const typename NodesImplBase::Notifier::ImmediateDetach&) { |
---|
1005 | Parent::clear(); |
---|
1006 | throw; |
---|
1007 | } |
---|
1008 | } |
---|
1009 | virtual void erase(const std::vector<Node>& nodes) { |
---|
1010 | try { |
---|
1011 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
1012 | _arcset.eraseNode(nodes[i]); |
---|
1013 | } |
---|
1014 | Parent::erase(nodes); |
---|
1015 | } catch (const typename NodesImplBase::Notifier::ImmediateDetach&) { |
---|
1016 | Parent::clear(); |
---|
1017 | throw; |
---|
1018 | } |
---|
1019 | } |
---|
1020 | virtual void clear() { |
---|
1021 | _arcset.clearNodes(); |
---|
1022 | Parent::clear(); |
---|
1023 | } |
---|
1024 | |
---|
1025 | private: |
---|
1026 | SmartArcSet& _arcset; |
---|
1027 | }; |
---|
1028 | |
---|
1029 | NodesImpl nodes; |
---|
1030 | |
---|
1031 | public: |
---|
1032 | |
---|
1033 | /// \brief Constructor of the ArcSet. |
---|
1034 | /// |
---|
1035 | /// Constructor of the ArcSet. |
---|
1036 | SmartArcSet(const Graph& graph) : nodes(graph, *this) { |
---|
1037 | Parent::initalize(graph, nodes); |
---|
1038 | } |
---|
1039 | |
---|
1040 | /// \brief Add a new arc to the digraph. |
---|
1041 | /// |
---|
1042 | /// Add a new arc to the digraph with source node \c s |
---|
1043 | /// and target node \c t. |
---|
1044 | /// \return the new arc. |
---|
1045 | Arc addArc(const Node& s, const Node& t) { |
---|
1046 | return Parent::addArc(s, t); |
---|
1047 | } |
---|
1048 | |
---|
1049 | /// \brief Validity check |
---|
1050 | /// |
---|
1051 | /// This functions gives back false if the ArcSet is |
---|
1052 | /// invalidated. It occurs when a node in the underlying graph is |
---|
1053 | /// erased and it is not isolated in the ArcSet. |
---|
1054 | bool valid() const { |
---|
1055 | return nodes.attached(); |
---|
1056 | } |
---|
1057 | |
---|
1058 | }; |
---|
1059 | |
---|
1060 | |
---|
1061 | template <typename _Graph> |
---|
1062 | class SmartEdgeSetBase { |
---|
1063 | public: |
---|
1064 | |
---|
1065 | typedef _Graph Graph; |
---|
1066 | typedef typename Graph::Node Node; |
---|
1067 | typedef typename Graph::NodeIt NodeIt; |
---|
1068 | |
---|
1069 | protected: |
---|
1070 | |
---|
1071 | struct NodeT { |
---|
1072 | int first_out; |
---|
1073 | NodeT() : first_out(-1) {} |
---|
1074 | }; |
---|
1075 | |
---|
1076 | typedef typename ItemSetTraits<Graph, Node>:: |
---|
1077 | template Map<NodeT>::Type NodesImplBase; |
---|
1078 | |
---|
1079 | NodesImplBase* nodes; |
---|
1080 | |
---|
1081 | struct ArcT { |
---|
1082 | Node target; |
---|
1083 | int next_out; |
---|
1084 | ArcT() {} |
---|
1085 | }; |
---|
1086 | |
---|
1087 | std::vector<ArcT> arcs; |
---|
1088 | |
---|
1089 | const Graph* graph; |
---|
1090 | |
---|
1091 | void initalize(const Graph& _graph, NodesImplBase& _nodes) { |
---|
1092 | graph = &_graph; |
---|
1093 | nodes = &_nodes; |
---|
1094 | } |
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1095 | |
---|
1096 | public: |
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1097 | |
---|
1098 | class Edge { |
---|
1099 | friend class SmartEdgeSetBase; |
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1100 | protected: |
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1101 | |
---|
1102 | int id; |
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1103 | explicit Edge(int _id) { id = _id;} |
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1104 | |
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1105 | public: |
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1106 | Edge() {} |
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1107 | Edge (Invalid) { id = -1; } |
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1108 | bool operator==(const Edge& arc) const {return id == arc.id;} |
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1109 | bool operator!=(const Edge& arc) const {return id != arc.id;} |
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1110 | bool operator<(const Edge& arc) const {return id < arc.id;} |
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1111 | }; |
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1112 | |
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1113 | class Arc { |
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1114 | friend class SmartEdgeSetBase; |
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1115 | protected: |
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1116 | Arc(int _id) : id(_id) {} |
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1117 | int id; |
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1118 | public: |
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1119 | operator Edge() const { return edgeFromId(id / 2); } |
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1120 | |
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1121 | Arc() {} |
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1122 | Arc(Invalid) : id(-1) {} |
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1123 | bool operator==(const Arc& arc) const { return id == arc.id; } |
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1124 | bool operator!=(const Arc& arc) const { return id != arc.id; } |
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1125 | bool operator<(const Arc& arc) const { return id < arc.id; } |
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1126 | }; |
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1127 | |
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1128 | SmartEdgeSetBase() {} |
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1129 | |
---|
1130 | Edge addEdge(const Node& u, const Node& v) { |
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1131 | int n = arcs.size(); |
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1132 | arcs.push_back(ArcT()); |
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1133 | arcs.push_back(ArcT()); |
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1134 | |
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1135 | arcs[n].target = u; |
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1136 | arcs[n | 1].target = v; |
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1137 | |
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1138 | arcs[n].next_out = (*nodes)[v].first_out; |
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1139 | (*nodes)[v].first_out = n; |
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1140 | |
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1141 | arcs[n | 1].next_out = (*nodes)[u].first_out; |
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1142 | (*nodes)[u].first_out = (n | 1); |
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1143 | |
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1144 | return Edge(n / 2); |
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1145 | } |
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1146 | |
---|
1147 | void clear() { |
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1148 | Node node; |
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1149 | for (first(node); node != INVALID; next(node)) { |
---|
1150 | (*nodes)[node].first_out = -1; |
---|
1151 | } |
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1152 | arcs.clear(); |
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1153 | } |
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1154 | |
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1155 | void first(Node& node) const { |
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1156 | graph->first(node); |
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1157 | } |
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1158 | |
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1159 | void next(Node& node) const { |
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1160 | graph->next(node); |
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1161 | } |
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1162 | |
---|
1163 | void first(Arc& arc) const { |
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1164 | arc.id = arcs.size() - 1; |
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1165 | } |
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1166 | |
---|
1167 | void next(Arc& arc) const { |
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1168 | --arc.id; |
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1169 | } |
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1170 | |
---|
1171 | void first(Edge& arc) const { |
---|
1172 | arc.id = arcs.size() / 2 - 1; |
---|
1173 | } |
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1174 | |
---|
1175 | void next(Edge& arc) const { |
---|
1176 | --arc.id; |
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1177 | } |
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1178 | |
---|
1179 | void firstOut(Arc& arc, const Node& node) const { |
---|
1180 | arc.id = (*nodes)[node].first_out; |
---|
1181 | } |
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1182 | |
---|
1183 | void nextOut(Arc& arc) const { |
---|
1184 | arc.id = arcs[arc.id].next_out; |
---|
1185 | } |
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1186 | |
---|
1187 | void firstIn(Arc& arc, const Node& node) const { |
---|
1188 | arc.id = (((*nodes)[node].first_out) ^ 1); |
---|
1189 | if (arc.id == -2) arc.id = -1; |
---|
1190 | } |
---|
1191 | |
---|
1192 | void nextIn(Arc& arc) const { |
---|
1193 | arc.id = ((arcs[arc.id ^ 1].next_out) ^ 1); |
---|
1194 | if (arc.id == -2) arc.id = -1; |
---|
1195 | } |
---|
1196 | |
---|
1197 | void firstInc(Edge &arc, bool& dir, const Node& node) const { |
---|
1198 | int de = (*nodes)[node].first_out; |
---|
1199 | if (de != -1 ) { |
---|
1200 | arc.id = de / 2; |
---|
1201 | dir = ((de & 1) == 1); |
---|
1202 | } else { |
---|
1203 | arc.id = -1; |
---|
1204 | dir = true; |
---|
1205 | } |
---|
1206 | } |
---|
1207 | void nextInc(Edge &arc, bool& dir) const { |
---|
1208 | int de = (arcs[(arc.id * 2) | (dir ? 1 : 0)].next_out); |
---|
1209 | if (de != -1 ) { |
---|
1210 | arc.id = de / 2; |
---|
1211 | dir = ((de & 1) == 1); |
---|
1212 | } else { |
---|
1213 | arc.id = -1; |
---|
1214 | dir = true; |
---|
1215 | } |
---|
1216 | } |
---|
1217 | |
---|
1218 | static bool direction(Arc arc) { |
---|
1219 | return (arc.id & 1) == 1; |
---|
1220 | } |
---|
1221 | |
---|
1222 | static Arc direct(Edge edge, bool dir) { |
---|
1223 | return Arc(edge.id * 2 + (dir ? 1 : 0)); |
---|
1224 | } |
---|
1225 | |
---|
1226 | int id(Node node) const { return graph->id(node); } |
---|
1227 | static int id(Arc arc) { return arc.id; } |
---|
1228 | static int id(Edge arc) { return arc.id; } |
---|
1229 | |
---|
1230 | Node nodeFromId(int id) const { return graph->nodeFromId(id); } |
---|
1231 | static Arc arcFromId(int id) { return Arc(id); } |
---|
1232 | static Edge edgeFromId(int id) { return Edge(id);} |
---|
1233 | |
---|
1234 | int maxNodeId() const { return graph->maxNodeId(); }; |
---|
1235 | int maxArcId() const { return arcs.size() - 1; } |
---|
1236 | int maxEdgeId() const { return arcs.size() / 2 - 1; } |
---|
1237 | |
---|
1238 | Node source(Arc e) const { return arcs[e.id ^ 1].target; } |
---|
1239 | Node target(Arc e) const { return arcs[e.id].target; } |
---|
1240 | |
---|
1241 | Node u(Edge e) const { return arcs[2 * e.id].target; } |
---|
1242 | Node v(Edge e) const { return arcs[2 * e.id + 1].target; } |
---|
1243 | |
---|
1244 | typedef typename ItemSetTraits<Graph, Node>::ItemNotifier NodeNotifier; |
---|
1245 | |
---|
1246 | NodeNotifier& notifier(Node) const { |
---|
1247 | return graph->notifier(Node()); |
---|
1248 | } |
---|
1249 | |
---|
1250 | template <typename _Value> |
---|
1251 | class NodeMap : public Graph::template NodeMap<_Value> { |
---|
1252 | public: |
---|
1253 | |
---|
1254 | typedef typename _Graph::template NodeMap<_Value> Parent; |
---|
1255 | |
---|
1256 | explicit NodeMap(const SmartEdgeSetBase<Graph>& arcset) |
---|
1257 | : Parent(*arcset.graph) { } |
---|
1258 | |
---|
1259 | NodeMap(const SmartEdgeSetBase<Graph>& arcset, const _Value& value) |
---|
1260 | : Parent(*arcset.graph, value) { } |
---|
1261 | |
---|
1262 | NodeMap& operator=(const NodeMap& cmap) { |
---|
1263 | return operator=<NodeMap>(cmap); |
---|
1264 | } |
---|
1265 | |
---|
1266 | template <typename CMap> |
---|
1267 | NodeMap& operator=(const CMap& cmap) { |
---|
1268 | Parent::operator=(cmap); |
---|
1269 | return *this; |
---|
1270 | } |
---|
1271 | }; |
---|
1272 | |
---|
1273 | }; |
---|
1274 | |
---|
1275 | /// \ingroup semi_adaptors |
---|
1276 | /// |
---|
1277 | /// \brief Graph using a node set of another digraph or graph and an |
---|
1278 | /// own edge set. |
---|
1279 | /// |
---|
1280 | /// This structure can be used to establish another graph over a |
---|
1281 | /// node set of an existing one. This class uses the same Node type |
---|
1282 | /// as the underlying graph, and each valid node of the original |
---|
1283 | /// graph is valid in this arc set, therefore the node objects of |
---|
1284 | /// the original graph can be used directly with this class. The |
---|
1285 | /// node handling functions (id handling, observing, and iterators) |
---|
1286 | /// works equivalently as in the original graph. |
---|
1287 | /// |
---|
1288 | /// \param _Graph The type of the graph which shares its node set |
---|
1289 | /// with this class. Its interface must conform to the |
---|
1290 | /// \ref concepts::Digraph "Digraph" or \ref concepts::Graph "Graph" |
---|
1291 | /// concept. |
---|
1292 | /// |
---|
1293 | /// This implementation is slightly faster than the \c ListEdgeSet, |
---|
1294 | /// because it uses continuous storage for edges and it uses just |
---|
1295 | /// single-linked lists for enumerate incident edges. Therefore the |
---|
1296 | /// edges cannot be erased from the edge sets. |
---|
1297 | /// |
---|
1298 | /// \warning If a node is erased from the underlying graph and this |
---|
1299 | /// node is incident to one edge in the edge set, then the edge set |
---|
1300 | /// is invalidated, and it cannot be used anymore. The validity can |
---|
1301 | /// be checked with the \c valid() member function. |
---|
1302 | /// |
---|
1303 | /// This class is fully conform to the \ref concepts::Graph |
---|
1304 | /// "Graph" concept. |
---|
1305 | template <typename _Graph> |
---|
1306 | class SmartEdgeSet : public EdgeSetExtender<SmartEdgeSetBase<_Graph> > { |
---|
1307 | |
---|
1308 | public: |
---|
1309 | |
---|
1310 | typedef EdgeSetExtender<SmartEdgeSetBase<_Graph> > Parent; |
---|
1311 | |
---|
1312 | typedef typename Parent::Node Node; |
---|
1313 | typedef typename Parent::Arc Arc; |
---|
1314 | typedef typename Parent::Edge Edge; |
---|
1315 | |
---|
1316 | typedef _Graph Graph; |
---|
1317 | |
---|
1318 | protected: |
---|
1319 | |
---|
1320 | typedef typename Parent::NodesImplBase NodesImplBase; |
---|
1321 | |
---|
1322 | void eraseNode(const Node& node) { |
---|
1323 | if (typename Parent::IncEdgeIt(*this, node) == INVALID) { |
---|
1324 | return; |
---|
1325 | } |
---|
1326 | throw typename NodesImplBase::Notifier::ImmediateDetach(); |
---|
1327 | } |
---|
1328 | |
---|
1329 | void clearNodes() { |
---|
1330 | Parent::clear(); |
---|
1331 | } |
---|
1332 | |
---|
1333 | class NodesImpl : public NodesImplBase { |
---|
1334 | public: |
---|
1335 | typedef NodesImplBase Parent; |
---|
1336 | |
---|
1337 | NodesImpl(const Graph& graph, SmartEdgeSet& arcset) |
---|
1338 | : Parent(graph), _arcset(arcset) {} |
---|
1339 | |
---|
1340 | virtual ~NodesImpl() {} |
---|
1341 | |
---|
1342 | bool attached() const { |
---|
1343 | return Parent::attached(); |
---|
1344 | } |
---|
1345 | |
---|
1346 | protected: |
---|
1347 | |
---|
1348 | virtual void erase(const Node& node) { |
---|
1349 | try { |
---|
1350 | _arcset.eraseNode(node); |
---|
1351 | Parent::erase(node); |
---|
1352 | } catch (const typename NodesImplBase::Notifier::ImmediateDetach&) { |
---|
1353 | Parent::clear(); |
---|
1354 | throw; |
---|
1355 | } |
---|
1356 | } |
---|
1357 | virtual void erase(const std::vector<Node>& nodes) { |
---|
1358 | try { |
---|
1359 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
1360 | _arcset.eraseNode(nodes[i]); |
---|
1361 | } |
---|
1362 | Parent::erase(nodes); |
---|
1363 | } catch (const typename NodesImplBase::Notifier::ImmediateDetach&) { |
---|
1364 | Parent::clear(); |
---|
1365 | throw; |
---|
1366 | } |
---|
1367 | } |
---|
1368 | virtual void clear() { |
---|
1369 | _arcset.clearNodes(); |
---|
1370 | Parent::clear(); |
---|
1371 | } |
---|
1372 | |
---|
1373 | private: |
---|
1374 | SmartEdgeSet& _arcset; |
---|
1375 | }; |
---|
1376 | |
---|
1377 | NodesImpl nodes; |
---|
1378 | |
---|
1379 | public: |
---|
1380 | |
---|
1381 | /// \brief Constructor of the EdgeSet. |
---|
1382 | /// |
---|
1383 | /// Constructor of the EdgeSet. |
---|
1384 | SmartEdgeSet(const Graph& graph) : nodes(graph, *this) { |
---|
1385 | Parent::initalize(graph, nodes); |
---|
1386 | } |
---|
1387 | |
---|
1388 | /// \brief Add a new edge to the graph. |
---|
1389 | /// |
---|
1390 | /// Add a new edge to the graph with node \c u |
---|
1391 | /// and node \c v endpoints. |
---|
1392 | /// \return the new edge. |
---|
1393 | Edge addEdge(const Node& u, const Node& v) { |
---|
1394 | return Parent::addEdge(u, v); |
---|
1395 | } |
---|
1396 | |
---|
1397 | /// \brief Validity check |
---|
1398 | /// |
---|
1399 | /// This functions gives back false if the EdgeSet is |
---|
1400 | /// invalidated. It occurs when a node in the underlying graph is |
---|
1401 | /// erased and it is not isolated in the EdgeSet. |
---|
1402 | bool valid() const { |
---|
1403 | return nodes.attached(); |
---|
1404 | } |
---|
1405 | |
---|
1406 | }; |
---|
1407 | |
---|
1408 | } |
---|
1409 | |
---|
1410 | #endif |
---|