1 | /* -*- C++ -*- |
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2 | * src/lemon/full_graph.h - Part of LEMON, a generic C++ optimization library |
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3 | * |
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4 | * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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5 | * (Egervary Combinatorial Optimization Research Group, 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_FULL_GRAPH_H |
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18 | #define LEMON_FULL_GRAPH_H |
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19 | |
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20 | |
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21 | #include <lemon/iterable_graph_extender.h> |
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22 | #include <lemon/alteration_observer_registry.h> |
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23 | #include <lemon/default_map.h> |
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24 | |
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25 | #include <lemon/invalid.h> |
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26 | #include <lemon/utility.h> |
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27 | |
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28 | |
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29 | ///\ingroup graphs |
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30 | ///\file |
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31 | ///\brief FullGraph and SymFullGraph classes. |
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32 | |
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33 | |
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34 | namespace lemon { |
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35 | |
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36 | /// \addtogroup graphs |
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37 | /// @{ |
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38 | |
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39 | class FullGraphBase { |
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40 | int NodeNum; |
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41 | int EdgeNum; |
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42 | public: |
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43 | |
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44 | typedef FullGraphBase Graph; |
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45 | |
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46 | class Node; |
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47 | class Edge; |
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48 | |
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49 | public: |
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50 | |
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51 | FullGraphBase() {} |
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52 | |
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53 | |
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54 | ///Creates a full graph with \c n nodes. |
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55 | void construct(int n) { NodeNum = n; EdgeNum = n * n; } |
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56 | /// |
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57 | // FullGraphBase(const FullGraphBase &_g) |
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58 | // : NodeNum(_g.nodeNum()), EdgeNum(NodeNum*NodeNum) { } |
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59 | |
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60 | typedef True NodeNumTag; |
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61 | typedef True EdgeNumTag; |
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62 | |
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63 | ///Number of nodes. |
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64 | int nodeNum() const { return NodeNum; } |
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65 | ///Number of edges. |
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66 | int edgeNum() const { return EdgeNum; } |
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67 | |
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68 | /// Maximum node ID. |
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69 | |
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70 | /// Maximum node ID. |
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71 | ///\sa id(Node) |
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72 | int maxId(Node = INVALID) const { return NodeNum-1; } |
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73 | /// Maximum edge ID. |
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74 | |
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75 | /// Maximum edge ID. |
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76 | ///\sa id(Edge) |
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77 | int maxId(Edge = INVALID) const { return EdgeNum-1; } |
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78 | |
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79 | Node tail(Edge e) const { return e.id % NodeNum; } |
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80 | Node head(Edge e) const { return e.id / NodeNum; } |
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81 | |
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82 | |
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83 | /// Node ID. |
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84 | |
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85 | /// The ID of a valid Node is a nonnegative integer not greater than |
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86 | /// \ref maxNodeId(). The range of the ID's is not surely continuous |
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87 | /// and the greatest node ID can be actually less then \ref maxNodeId(). |
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88 | /// |
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89 | /// The ID of the \ref INVALID node is -1. |
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90 | ///\return The ID of the node \c v. |
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91 | |
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92 | static int id(Node v) { return v.id; } |
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93 | /// Edge ID. |
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94 | |
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95 | /// The ID of a valid Edge is a nonnegative integer not greater than |
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96 | /// \ref maxEdgeId(). The range of the ID's is not surely continuous |
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97 | /// and the greatest edge ID can be actually less then \ref maxEdgeId(). |
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98 | /// |
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99 | /// The ID of the \ref INVALID edge is -1. |
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100 | ///\return The ID of the edge \c e. |
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101 | static int id(Edge e) { return e.id; } |
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102 | |
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103 | /// Finds an edge between two nodes. |
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104 | |
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105 | /// Finds an edge from node \c u to node \c v. |
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106 | /// |
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107 | /// If \c prev is \ref INVALID (this is the default value), then |
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108 | /// It finds the first edge from \c u to \c v. Otherwise it looks for |
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109 | /// the next edge from \c u to \c v after \c prev. |
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110 | /// \return The found edge or INVALID if there is no such an edge. |
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111 | Edge findEdge(Node u,Node v, Edge prev = INVALID) |
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112 | { |
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113 | return prev.id == -1 ? Edge(*this, u.id, v.id) : INVALID; |
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114 | } |
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115 | |
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116 | |
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117 | class Node { |
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118 | friend class FullGraphBase; |
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119 | |
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120 | protected: |
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121 | int id; |
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122 | Node(int _id) { id = _id;} |
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123 | public: |
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124 | Node() {} |
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125 | Node (Invalid) { id = -1; } |
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126 | bool operator==(const Node node) const {return id == node.id;} |
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127 | bool operator!=(const Node node) const {return id != node.id;} |
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128 | bool operator<(const Node node) const {return id < node.id;} |
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129 | }; |
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130 | |
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131 | |
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132 | |
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133 | class Edge { |
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134 | friend class FullGraphBase; |
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135 | |
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136 | protected: |
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137 | int id; // NodeNum * head + tail; |
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138 | |
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139 | Edge(int _id) : id(_id) {} |
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140 | |
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141 | Edge(const FullGraphBase& _graph, int tail, int head) |
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142 | : id(_graph.NodeNum * head+tail) {} |
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143 | public: |
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144 | Edge() { } |
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145 | Edge (Invalid) { id = -1; } |
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146 | bool operator==(const Edge edge) const {return id == edge.id;} |
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147 | bool operator!=(const Edge edge) const {return id != edge.id;} |
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148 | bool operator<(const Edge edge) const {return id < edge.id;} |
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149 | }; |
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150 | |
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151 | void first(Node& node) const { |
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152 | node.id = NodeNum-1; |
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153 | } |
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154 | |
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155 | static void next(Node& node) { |
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156 | --node.id; |
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157 | } |
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158 | |
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159 | void first(Edge& edge) const { |
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160 | edge.id = EdgeNum-1; |
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161 | } |
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162 | |
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163 | static void next(Edge& edge) { |
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164 | --edge.id; |
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165 | } |
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166 | |
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167 | void firstOut(Edge& edge, const Node& node) const { |
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168 | edge.id = EdgeNum + node.id - NodeNum; |
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169 | } |
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170 | |
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171 | void nextOut(Edge& edge) const { |
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172 | edge.id -= NodeNum; |
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173 | if (edge.id < 0) edge.id = -1; |
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174 | } |
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175 | |
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176 | void firstIn(Edge& edge, const Node& node) const { |
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177 | edge.id = node.id * NodeNum; |
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178 | } |
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179 | |
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180 | void nextIn(Edge& edge) const { |
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181 | ++edge.id; |
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182 | if (edge.id % NodeNum == 0) edge.id = -1; |
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183 | } |
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184 | |
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185 | }; |
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186 | |
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187 | |
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188 | typedef AlterableGraphExtender<FullGraphBase> AlterableFullGraphBase; |
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189 | typedef IterableGraphExtender<AlterableFullGraphBase> IterableFullGraphBase; |
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190 | typedef DefaultMappableGraphExtender<IterableFullGraphBase> MappableFullGraphBase; |
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191 | |
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192 | ///A full graph class. |
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193 | |
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194 | ///This is a simple and fast directed full graph implementation. |
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195 | ///It is completely static, so you can neither add nor delete either |
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196 | ///edges or nodes. |
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197 | ///Thus it conforms to |
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198 | ///the \ref concept::StaticGraph "StaticGraph" concept |
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199 | ///\sa concept::StaticGraph. |
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200 | ///\todo What about loops? |
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201 | ///\todo Don't we need SymEdgeMap? |
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202 | /// |
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203 | ///\author Alpar Juttner |
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204 | class FullGraph : public MappableFullGraphBase { |
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205 | public: |
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206 | |
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207 | FullGraph(int n) { construct(n); } |
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208 | }; |
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209 | |
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210 | /// @} |
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211 | |
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212 | } //namespace lemon |
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213 | |
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214 | |
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215 | #endif //LEMON_FULL_GRAPH_H |
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