1 | /* -*- C++ -*- |
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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_STATIC_GRAPH_H |
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20 | #define LEMON_STATIC_GRAPH_H |
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21 | |
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22 | ///\ingroup graphs |
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23 | ///\file |
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24 | ///\brief StaticDigraph class. |
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25 | |
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26 | #include <lemon/core.h> |
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27 | #include <lemon/bits/graph_extender.h> |
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28 | |
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29 | namespace lemon { |
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30 | |
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31 | class StaticDigraphBase { |
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32 | public: |
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33 | |
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34 | StaticDigraphBase() |
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35 | : node_num(-1), arc_num(0), |
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36 | node_first_out(NULL), node_first_in(NULL), |
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37 | arc_source(NULL), arc_target(NULL), |
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38 | arc_next_in(NULL), arc_next_out(NULL) {} |
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39 | |
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40 | ~StaticDigraphBase() { |
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41 | if (node_num != -1) { |
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42 | delete[] node_first_out; |
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43 | delete[] node_first_in; |
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44 | delete[] arc_source; |
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45 | delete[] arc_target; |
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46 | delete[] arc_next_out; |
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47 | delete[] arc_next_in; |
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48 | } |
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49 | } |
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50 | |
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51 | class Node { |
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52 | friend class StaticDigraphBase; |
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53 | protected: |
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54 | int id; |
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55 | Node(int _id) : id(_id) {} |
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56 | public: |
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57 | Node() {} |
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58 | Node (Invalid) : id(-1) {} |
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59 | bool operator==(const Node& node) const { return id == node.id; } |
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60 | bool operator!=(const Node& node) const { return id != node.id; } |
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61 | bool operator<(const Node& node) const { return id < node.id; } |
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62 | }; |
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63 | |
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64 | class Arc { |
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65 | friend class StaticDigraphBase; |
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66 | protected: |
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67 | int id; |
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68 | Arc(int _id) : id(_id) {} |
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69 | public: |
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70 | Arc() { } |
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71 | Arc (Invalid) : id(-1) {} |
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72 | bool operator==(const Arc& arc) const { return id == arc.id; } |
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73 | bool operator!=(const Arc& arc) const { return id != arc.id; } |
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74 | bool operator<(const Arc& arc) const { return id < arc.id; } |
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75 | }; |
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76 | |
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77 | Node source(const Arc& e) const { return Node(arc_source[e.id]); } |
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78 | Node target(const Arc& e) const { return Node(arc_target[e.id]); } |
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79 | |
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80 | void first(Node& n) const { n.id = node_num - 1; } |
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81 | static void next(Node& n) { --n.id; } |
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82 | |
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83 | void first(Arc& e) const { e.id = arc_num - 1; } |
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84 | static void next(Arc& e) { --e.id; } |
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85 | |
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86 | void firstOut(Arc& e, const Node& n) const { |
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87 | e.id = node_first_out[n.id] != node_first_out[n.id + 1] ? |
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88 | node_first_out[n.id] : -1; |
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89 | } |
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90 | void nextOut(Arc& e) const { e.id = arc_next_out[e.id]; } |
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91 | |
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92 | void firstIn(Arc& e, const Node& n) const { e.id = node_first_in[n.id]; } |
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93 | void nextIn(Arc& e) const { e.id = arc_next_in[e.id]; } |
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94 | |
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95 | int id(const Node& n) const { return n.id; } |
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96 | Node nodeFromId(int id) const { return Node(id); } |
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97 | int maxNodeId() const { return node_num - 1; } |
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98 | |
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99 | int id(const Arc& e) const { return e.id; } |
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100 | Arc arcFromId(int id) const { return Arc(id); } |
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101 | int maxArcId() const { return arc_num - 1; } |
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102 | |
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103 | typedef True NodeNumTag; |
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104 | typedef True ArcNumTag; |
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105 | |
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106 | int nodeNum() const { return node_num; } |
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107 | int arcNum() const { return arc_num; } |
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108 | |
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109 | private: |
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110 | |
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111 | template <typename Digraph, typename NodeRefMap> |
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112 | class ArcLess { |
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113 | public: |
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114 | typedef typename Digraph::Arc Arc; |
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115 | |
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116 | ArcLess(const Digraph &_graph, const NodeRefMap& _nodeRef) |
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117 | : digraph(_graph), nodeRef(_nodeRef) {} |
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118 | |
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119 | bool operator()(const Arc& left, const Arc& right) const { |
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120 | return nodeRef[digraph.target(left)] < nodeRef[digraph.target(right)]; |
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121 | } |
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122 | private: |
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123 | const Digraph& digraph; |
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124 | const NodeRefMap& nodeRef; |
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125 | }; |
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126 | |
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127 | public: |
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128 | |
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129 | typedef True BuildTag; |
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130 | |
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131 | template <typename Digraph, typename NodeRefMap, typename ArcRefMap> |
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132 | void build(const Digraph& digraph, NodeRefMap& nodeRef, ArcRefMap& arcRef) { |
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133 | |
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134 | if (node_num != -1) { |
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135 | delete[] node_first_out; |
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136 | delete[] node_first_in; |
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137 | delete[] arc_source; |
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138 | delete[] arc_target; |
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139 | delete[] arc_next_out; |
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140 | delete[] arc_next_in; |
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141 | } |
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142 | |
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143 | typedef typename Digraph::Node GNode; |
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144 | typedef typename Digraph::Arc GArc; |
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145 | |
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146 | node_num = countNodes(digraph); |
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147 | arc_num = countArcs(digraph); |
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148 | |
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149 | node_first_out = new int[node_num + 1]; |
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150 | node_first_in = new int[node_num]; |
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151 | |
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152 | arc_source = new int[arc_num]; |
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153 | arc_target = new int[arc_num]; |
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154 | arc_next_out = new int[arc_num]; |
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155 | arc_next_in = new int[arc_num]; |
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156 | |
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157 | int node_index = 0; |
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158 | for (typename Digraph::NodeIt n(digraph); n != INVALID; ++n) { |
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159 | nodeRef[n] = Node(node_index); |
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160 | node_first_in[node_index] = -1; |
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161 | ++node_index; |
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162 | } |
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163 | |
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164 | ArcLess<Digraph, NodeRefMap> arcLess(digraph, nodeRef); |
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165 | |
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166 | int arc_index = 0; |
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167 | for (typename Digraph::NodeIt n(digraph); n != INVALID; ++n) { |
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168 | int source = nodeRef[n].id; |
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169 | std::vector<GArc> arcs; |
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170 | for (typename Digraph::OutArcIt e(digraph, n); e != INVALID; ++e) { |
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171 | arcs.push_back(e); |
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172 | } |
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173 | if (!arcs.empty()) { |
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174 | node_first_out[source] = arc_index; |
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175 | std::sort(arcs.begin(), arcs.end(), arcLess); |
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176 | for (typename std::vector<GArc>::iterator it = arcs.begin(); |
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177 | it != arcs.end(); ++it) { |
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178 | int target = nodeRef[digraph.target(*it)].id; |
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179 | arcRef[*it] = Arc(arc_index); |
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180 | arc_source[arc_index] = source; |
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181 | arc_target[arc_index] = target; |
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182 | arc_next_in[arc_index] = node_first_in[target]; |
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183 | node_first_in[target] = arc_index; |
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184 | arc_next_out[arc_index] = arc_index + 1; |
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185 | ++arc_index; |
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186 | } |
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187 | arc_next_out[arc_index - 1] = -1; |
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188 | } else { |
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189 | node_first_out[source] = arc_index; |
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190 | } |
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191 | } |
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192 | node_first_out[node_num] = arc_num; |
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193 | } |
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194 | |
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195 | protected: |
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196 | |
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197 | void fastFirstOut(Arc& e, const Node& n) const { |
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198 | e.id = node_first_out[n.id]; |
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199 | } |
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200 | |
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201 | static void fastNextOut(Arc& e) { |
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202 | ++e.id; |
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203 | } |
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204 | void fastLastOut(Arc& e, const Node& n) const { |
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205 | e.id = node_first_out[n.id + 1]; |
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206 | } |
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207 | |
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208 | private: |
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209 | int node_num; |
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210 | int arc_num; |
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211 | int *node_first_out; |
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212 | int *node_first_in; |
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213 | int *arc_source; |
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214 | int *arc_target; |
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215 | int *arc_next_in; |
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216 | int *arc_next_out; |
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217 | }; |
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218 | |
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219 | typedef DigraphExtender<StaticDigraphBase> ExtendedStaticDigraphBase; |
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220 | |
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221 | |
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222 | class StaticDigraph : public ExtendedStaticDigraphBase { |
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223 | public: |
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224 | |
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225 | typedef ExtendedStaticDigraphBase Parent; |
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226 | |
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227 | protected: |
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228 | |
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229 | using Parent::fastFirstOut; |
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230 | using Parent::fastNextOut; |
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231 | using Parent::fastLastOut; |
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232 | |
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233 | public: |
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234 | |
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235 | class OutArcIt : public Arc { |
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236 | public: |
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237 | |
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238 | OutArcIt() { } |
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239 | |
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240 | OutArcIt(Invalid i) : Arc(i) { } |
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241 | |
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242 | OutArcIt(const StaticDigraph& digraph, const Node& node) { |
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243 | digraph.fastFirstOut(*this, node); |
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244 | digraph.fastLastOut(last, node); |
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245 | if (last == *this) *this = INVALID; |
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246 | } |
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247 | |
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248 | OutArcIt(const StaticDigraph& digraph, const Arc& arc) : Arc(arc) { |
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249 | if (arc != INVALID) { |
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250 | digraph.fastLastOut(last, digraph.source(arc)); |
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251 | } |
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252 | } |
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253 | |
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254 | OutArcIt& operator++() { |
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255 | StaticDigraph::fastNextOut(*this); |
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256 | if (last == *this) *this = INVALID; |
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257 | return *this; |
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258 | } |
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259 | |
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260 | private: |
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261 | Arc last; |
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262 | }; |
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263 | |
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264 | }; |
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265 | |
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266 | } |
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267 | |
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268 | #endif |
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