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/idmappable_graph_extender.h> |
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22 | |
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23 | #include <lemon/iterable_graph_extender.h> |
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24 | |
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25 | #include <lemon/alteration_observer_registry.h> |
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26 | #include <lemon/default_map.h> |
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27 | |
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28 | ///\ingroup graphs |
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29 | ///\file |
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30 | ///\brief FullGraph and SymFullGraph classes. |
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31 | |
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32 | |
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33 | #include <lemon/invalid.h> |
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34 | |
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35 | namespace lemon { |
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36 | |
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37 | /// \addtogroup graphs |
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38 | /// @{ |
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39 | |
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40 | class FullGraphBase { |
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41 | int NodeNum; |
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42 | int EdgeNum; |
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43 | public: |
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44 | |
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45 | typedef FullGraphBase Graph; |
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46 | |
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47 | class Node; |
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48 | class Edge; |
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49 | |
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50 | public: |
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51 | |
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52 | FullGraphBase() {} |
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53 | |
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54 | |
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55 | ///Creates a full graph with \c n nodes. |
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56 | void construct(int n) { NodeNum = n; EdgeNum = n * n; } |
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57 | /// |
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58 | // FullGraphBase(const FullGraphBase &_g) |
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59 | // : NodeNum(_g.nodeNum()), EdgeNum(NodeNum*NodeNum) { } |
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60 | |
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61 | ///Number of nodes. |
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62 | int nodeNum() const { return NodeNum; } |
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63 | ///Number of edges. |
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64 | int edgeNum() const { return EdgeNum; } |
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65 | |
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66 | /// Maximum node ID. |
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67 | |
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68 | /// Maximum node ID. |
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69 | ///\sa id(Node) |
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70 | int maxNodeId() const { return NodeNum-1; } |
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71 | /// Maximum edge ID. |
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72 | |
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73 | /// Maximum edge ID. |
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74 | ///\sa id(Edge) |
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75 | int maxEdgeId() const { return EdgeNum-1; } |
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76 | |
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77 | Node tail(Edge e) const { return e.id % NodeNum; } |
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78 | Node head(Edge e) const { return e.id / NodeNum; } |
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79 | |
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80 | |
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81 | /// Node ID. |
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82 | |
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83 | /// The ID of a valid Node is a nonnegative integer not greater than |
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84 | /// \ref maxNodeId(). The range of the ID's is not surely continuous |
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85 | /// and the greatest node ID can be actually less then \ref maxNodeId(). |
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86 | /// |
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87 | /// The ID of the \ref INVALID node is -1. |
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88 | ///\return The ID of the node \c v. |
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89 | |
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90 | static int id(Node v) { return v.id; } |
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91 | /// Edge ID. |
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92 | |
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93 | /// The ID of a valid Edge is a nonnegative integer not greater than |
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94 | /// \ref maxEdgeId(). The range of the ID's is not surely continuous |
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95 | /// and the greatest edge ID can be actually less then \ref maxEdgeId(). |
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96 | /// |
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97 | /// The ID of the \ref INVALID edge is -1. |
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98 | ///\return The ID of the edge \c e. |
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99 | static int id(Edge e) { return e.id; } |
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100 | |
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101 | /// Finds an edge between two nodes. |
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102 | |
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103 | /// Finds an edge from node \c u to node \c v. |
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104 | /// |
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105 | /// If \c prev is \ref INVALID (this is the default value), then |
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106 | /// It finds the first edge from \c u to \c v. Otherwise it looks for |
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107 | /// the next edge from \c u to \c v after \c prev. |
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108 | /// \return The found edge or INVALID if there is no such an edge. |
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109 | Edge findEdge(Node u,Node v, Edge prev = INVALID) |
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110 | { |
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111 | return prev.id == -1 ? Edge(*this, u.id, v.id) : INVALID; |
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112 | } |
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113 | |
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114 | |
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115 | class Node { |
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116 | friend class FullGraphBase; |
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117 | |
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118 | protected: |
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119 | int id; |
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120 | Node(int _id) { id = _id;} |
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121 | public: |
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122 | Node() {} |
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123 | Node (Invalid) { id = -1; } |
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124 | bool operator==(const Node node) const {return id == node.id;} |
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125 | bool operator!=(const Node node) const {return id != node.id;} |
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126 | bool operator<(const Node node) const {return id < node.id;} |
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127 | }; |
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128 | |
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129 | |
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130 | |
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131 | class Edge { |
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132 | friend class FullGraphBase; |
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133 | |
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134 | protected: |
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135 | int id; // NodeNum * head + tail; |
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136 | |
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137 | Edge(int _id) : id(_id) {} |
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138 | |
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139 | Edge(const FullGraphBase& _graph, int tail, int head) |
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140 | : id(_graph.NodeNum * head+tail) {} |
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141 | public: |
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142 | Edge() { } |
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143 | Edge (Invalid) { id = -1; } |
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144 | bool operator==(const Edge edge) const {return id == edge.id;} |
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145 | bool operator!=(const Edge edge) const {return id != edge.id;} |
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146 | bool operator<(const Edge edge) const {return id < edge.id;} |
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147 | }; |
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148 | |
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149 | void first(Node& node) const { |
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150 | node.id = NodeNum-1; |
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151 | } |
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152 | |
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153 | static void next(Node& node) { |
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154 | --node.id; |
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155 | } |
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156 | |
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157 | void first(Edge& edge) const { |
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158 | edge.id = EdgeNum-1; |
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159 | } |
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160 | |
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161 | static void next(Edge& edge) { |
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162 | --edge.id; |
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163 | } |
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164 | |
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165 | void firstOut(Edge& edge, const Node& node) const { |
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166 | edge.id = EdgeNum + node.id - NodeNum; |
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167 | } |
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168 | |
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169 | void nextOut(Edge& edge) const { |
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170 | edge.id -= NodeNum; |
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171 | if (edge.id < 0) edge.id = -1; |
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172 | } |
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173 | |
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174 | void firstIn(Edge& edge, const Node& node) const { |
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175 | edge.id = node.id * NodeNum; |
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176 | } |
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177 | |
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178 | void nextIn(Edge& edge) const { |
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179 | ++edge.id; |
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180 | if (edge.id % NodeNum == 0) edge.id = -1; |
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181 | } |
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182 | |
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183 | }; |
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184 | |
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185 | |
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186 | typedef AlterableGraphExtender<FullGraphBase> AlterableFullGraphBase; |
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187 | typedef IterableGraphExtender<AlterableFullGraphBase> IterableFullGraphBase; |
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188 | typedef IdMappableGraphExtender<IterableFullGraphBase> IdMappableFullGraphBase; |
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189 | typedef DefaultMappableGraphExtender<IdMappableFullGraphBase> MappableFullGraphBase; |
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190 | |
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191 | ///A full graph class. |
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192 | |
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193 | ///This is a simple and fast directed full graph implementation. |
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194 | ///It is completely static, so you can neither add nor delete either |
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195 | ///edges or nodes. |
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196 | ///Thus it conforms to |
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197 | ///the \ref skeleton::StaticGraph "StaticGraph" concept |
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198 | ///\sa skeleton::StaticGraph. |
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199 | ///\todo What about loops? |
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200 | ///\todo Don't we need SymEdgeMap? |
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201 | /// |
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202 | ///\author Alpar Juttner |
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203 | class FullGraph : public MappableFullGraphBase { |
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204 | public: |
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205 | |
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206 | FullGraph(int n) { construct(n); } |
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207 | }; |
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208 | |
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209 | template <> |
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210 | int countNodes<FullGraph>(const FullGraph& graph) { |
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211 | return graph.nodeNum(); |
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212 | } |
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213 | |
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214 | template <> |
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215 | int countEdges<FullGraph>(const FullGraph& graph) { |
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216 | return graph.edgeNum(); |
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217 | } |
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218 | |
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219 | /// @} |
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220 | |
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221 | } //namespace lemon |
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222 | |
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223 | |
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224 | |
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225 | |
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226 | #endif //LEMON_FULL_GRAPH_H |
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