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) 2003-2009 |
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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_CORE_H |
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20 | #define LEMON_CORE_H |
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21 | |
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22 | #include <vector> |
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23 | #include <algorithm> |
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24 | |
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25 | #include <lemon/bits/enable_if.h> |
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26 | #include <lemon/bits/traits.h> |
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27 | #include <lemon/assert.h> |
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28 | |
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29 | ///\file |
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30 | ///\brief LEMON core utilities. |
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31 | /// |
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32 | ///This header file contains core utilities for LEMON. |
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33 | ///It is automatically included by all graph types, therefore it usually |
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34 | ///do not have to be included directly. |
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35 | |
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36 | namespace lemon { |
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37 | |
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38 | /// \brief Dummy type to make it easier to create invalid iterators. |
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39 | /// |
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40 | /// Dummy type to make it easier to create invalid iterators. |
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41 | /// See \ref INVALID for the usage. |
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42 | struct Invalid { |
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43 | public: |
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44 | bool operator==(Invalid) { return true; } |
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45 | bool operator!=(Invalid) { return false; } |
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46 | bool operator< (Invalid) { return false; } |
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47 | }; |
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48 | |
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49 | /// \brief Invalid iterators. |
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50 | /// |
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51 | /// \ref Invalid is a global type that converts to each iterator |
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52 | /// in such a way that the value of the target iterator will be invalid. |
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53 | #ifdef LEMON_ONLY_TEMPLATES |
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54 | const Invalid INVALID = Invalid(); |
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55 | #else |
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56 | extern const Invalid INVALID; |
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57 | #endif |
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58 | |
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59 | /// \addtogroup gutils |
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60 | /// @{ |
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61 | |
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62 | ///Create convenience typedefs for the digraph types and iterators |
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63 | |
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64 | ///This \c \#define creates convenient type definitions for the following |
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65 | ///types of \c Digraph: \c Node, \c NodeIt, \c Arc, \c ArcIt, \c InArcIt, |
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66 | ///\c OutArcIt, \c BoolNodeMap, \c IntNodeMap, \c DoubleNodeMap, |
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67 | ///\c BoolArcMap, \c IntArcMap, \c DoubleArcMap. |
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68 | /// |
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69 | ///\note If the graph type is a dependent type, ie. the graph type depend |
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70 | ///on a template parameter, then use \c TEMPLATE_DIGRAPH_TYPEDEFS() |
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71 | ///macro. |
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72 | #define DIGRAPH_TYPEDEFS(Digraph) \ |
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73 | typedef Digraph::Node Node; \ |
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74 | typedef Digraph::NodeIt NodeIt; \ |
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75 | typedef Digraph::Arc Arc; \ |
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76 | typedef Digraph::ArcIt ArcIt; \ |
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77 | typedef Digraph::InArcIt InArcIt; \ |
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78 | typedef Digraph::OutArcIt OutArcIt; \ |
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79 | typedef Digraph::NodeMap<bool> BoolNodeMap; \ |
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80 | typedef Digraph::NodeMap<int> IntNodeMap; \ |
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81 | typedef Digraph::NodeMap<double> DoubleNodeMap; \ |
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82 | typedef Digraph::ArcMap<bool> BoolArcMap; \ |
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83 | typedef Digraph::ArcMap<int> IntArcMap; \ |
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84 | typedef Digraph::ArcMap<double> DoubleArcMap |
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85 | |
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86 | ///Create convenience typedefs for the digraph types and iterators |
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87 | |
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88 | ///\see DIGRAPH_TYPEDEFS |
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89 | /// |
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90 | ///\note Use this macro, if the graph type is a dependent type, |
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91 | ///ie. the graph type depend on a template parameter. |
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92 | #define TEMPLATE_DIGRAPH_TYPEDEFS(Digraph) \ |
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93 | typedef typename Digraph::Node Node; \ |
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94 | typedef typename Digraph::NodeIt NodeIt; \ |
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95 | typedef typename Digraph::Arc Arc; \ |
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96 | typedef typename Digraph::ArcIt ArcIt; \ |
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97 | typedef typename Digraph::InArcIt InArcIt; \ |
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98 | typedef typename Digraph::OutArcIt OutArcIt; \ |
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99 | typedef typename Digraph::template NodeMap<bool> BoolNodeMap; \ |
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100 | typedef typename Digraph::template NodeMap<int> IntNodeMap; \ |
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101 | typedef typename Digraph::template NodeMap<double> DoubleNodeMap; \ |
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102 | typedef typename Digraph::template ArcMap<bool> BoolArcMap; \ |
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103 | typedef typename Digraph::template ArcMap<int> IntArcMap; \ |
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104 | typedef typename Digraph::template ArcMap<double> DoubleArcMap |
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105 | |
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106 | ///Create convenience typedefs for the graph types and iterators |
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107 | |
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108 | ///This \c \#define creates the same convenient type definitions as defined |
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109 | ///by \ref DIGRAPH_TYPEDEFS(Graph) and six more, namely it creates |
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110 | ///\c Edge, \c EdgeIt, \c IncEdgeIt, \c BoolEdgeMap, \c IntEdgeMap, |
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111 | ///\c DoubleEdgeMap. |
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112 | /// |
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113 | ///\note If the graph type is a dependent type, ie. the graph type depend |
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114 | ///on a template parameter, then use \c TEMPLATE_GRAPH_TYPEDEFS() |
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115 | ///macro. |
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116 | #define GRAPH_TYPEDEFS(Graph) \ |
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117 | DIGRAPH_TYPEDEFS(Graph); \ |
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118 | typedef Graph::Edge Edge; \ |
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119 | typedef Graph::EdgeIt EdgeIt; \ |
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120 | typedef Graph::IncEdgeIt IncEdgeIt; \ |
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121 | typedef Graph::EdgeMap<bool> BoolEdgeMap; \ |
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122 | typedef Graph::EdgeMap<int> IntEdgeMap; \ |
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123 | typedef Graph::EdgeMap<double> DoubleEdgeMap |
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124 | |
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125 | ///Create convenience typedefs for the graph types and iterators |
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126 | |
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127 | ///\see GRAPH_TYPEDEFS |
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128 | /// |
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129 | ///\note Use this macro, if the graph type is a dependent type, |
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130 | ///ie. the graph type depend on a template parameter. |
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131 | #define TEMPLATE_GRAPH_TYPEDEFS(Graph) \ |
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132 | TEMPLATE_DIGRAPH_TYPEDEFS(Graph); \ |
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133 | typedef typename Graph::Edge Edge; \ |
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134 | typedef typename Graph::EdgeIt EdgeIt; \ |
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135 | typedef typename Graph::IncEdgeIt IncEdgeIt; \ |
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136 | typedef typename Graph::template EdgeMap<bool> BoolEdgeMap; \ |
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137 | typedef typename Graph::template EdgeMap<int> IntEdgeMap; \ |
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138 | typedef typename Graph::template EdgeMap<double> DoubleEdgeMap |
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139 | |
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140 | /// \brief Function to count the items in a graph. |
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141 | /// |
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142 | /// This function counts the items (nodes, arcs etc.) in a graph. |
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143 | /// The complexity of the function is linear because |
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144 | /// it iterates on all of the items. |
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145 | template <typename Graph, typename Item> |
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146 | inline int countItems(const Graph& g) { |
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147 | typedef typename ItemSetTraits<Graph, Item>::ItemIt ItemIt; |
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148 | int num = 0; |
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149 | for (ItemIt it(g); it != INVALID; ++it) { |
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150 | ++num; |
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151 | } |
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152 | return num; |
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153 | } |
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154 | |
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155 | // Node counting: |
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156 | |
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157 | namespace _core_bits { |
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158 | |
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159 | template <typename Graph, typename Enable = void> |
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160 | struct CountNodesSelector { |
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161 | static int count(const Graph &g) { |
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162 | return countItems<Graph, typename Graph::Node>(g); |
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163 | } |
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164 | }; |
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165 | |
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166 | template <typename Graph> |
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167 | struct CountNodesSelector< |
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168 | Graph, typename |
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169 | enable_if<typename Graph::NodeNumTag, void>::type> |
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170 | { |
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171 | static int count(const Graph &g) { |
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172 | return g.nodeNum(); |
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173 | } |
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174 | }; |
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175 | } |
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176 | |
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177 | /// \brief Function to count the nodes in the graph. |
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178 | /// |
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179 | /// This function counts the nodes in the graph. |
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180 | /// The complexity of the function is <em>O</em>(<em>n</em>), but for some |
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181 | /// graph structures it is specialized to run in <em>O</em>(1). |
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182 | /// |
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183 | /// \note If the graph contains a \c nodeNum() member function and a |
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184 | /// \c NodeNumTag tag then this function calls directly the member |
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185 | /// function to query the cardinality of the node set. |
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186 | template <typename Graph> |
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187 | inline int countNodes(const Graph& g) { |
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188 | return _core_bits::CountNodesSelector<Graph>::count(g); |
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189 | } |
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190 | |
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191 | // Arc counting: |
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192 | |
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193 | namespace _core_bits { |
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194 | |
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195 | template <typename Graph, typename Enable = void> |
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196 | struct CountArcsSelector { |
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197 | static int count(const Graph &g) { |
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198 | return countItems<Graph, typename Graph::Arc>(g); |
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199 | } |
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200 | }; |
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201 | |
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202 | template <typename Graph> |
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203 | struct CountArcsSelector< |
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204 | Graph, |
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205 | typename enable_if<typename Graph::ArcNumTag, void>::type> |
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206 | { |
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207 | static int count(const Graph &g) { |
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208 | return g.arcNum(); |
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209 | } |
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210 | }; |
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211 | } |
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212 | |
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213 | /// \brief Function to count the arcs in the graph. |
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214 | /// |
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215 | /// This function counts the arcs in the graph. |
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216 | /// The complexity of the function is <em>O</em>(<em>m</em>), but for some |
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217 | /// graph structures it is specialized to run in <em>O</em>(1). |
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218 | /// |
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219 | /// \note If the graph contains a \c arcNum() member function and a |
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220 | /// \c ArcNumTag tag then this function calls directly the member |
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221 | /// function to query the cardinality of the arc set. |
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222 | template <typename Graph> |
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223 | inline int countArcs(const Graph& g) { |
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224 | return _core_bits::CountArcsSelector<Graph>::count(g); |
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225 | } |
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226 | |
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227 | // Edge counting: |
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228 | |
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229 | namespace _core_bits { |
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230 | |
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231 | template <typename Graph, typename Enable = void> |
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232 | struct CountEdgesSelector { |
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233 | static int count(const Graph &g) { |
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234 | return countItems<Graph, typename Graph::Edge>(g); |
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235 | } |
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236 | }; |
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237 | |
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238 | template <typename Graph> |
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239 | struct CountEdgesSelector< |
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240 | Graph, |
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241 | typename enable_if<typename Graph::EdgeNumTag, void>::type> |
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242 | { |
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243 | static int count(const Graph &g) { |
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244 | return g.edgeNum(); |
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245 | } |
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246 | }; |
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247 | } |
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248 | |
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249 | /// \brief Function to count the edges in the graph. |
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250 | /// |
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251 | /// This function counts the edges in the graph. |
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252 | /// The complexity of the function is <em>O</em>(<em>m</em>), but for some |
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253 | /// graph structures it is specialized to run in <em>O</em>(1). |
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254 | /// |
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255 | /// \note If the graph contains a \c edgeNum() member function and a |
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256 | /// \c EdgeNumTag tag then this function calls directly the member |
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257 | /// function to query the cardinality of the edge set. |
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258 | template <typename Graph> |
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259 | inline int countEdges(const Graph& g) { |
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260 | return _core_bits::CountEdgesSelector<Graph>::count(g); |
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261 | |
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262 | } |
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263 | |
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264 | |
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265 | template <typename Graph, typename DegIt> |
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266 | inline int countNodeDegree(const Graph& _g, const typename Graph::Node& _n) { |
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267 | int num = 0; |
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268 | for (DegIt it(_g, _n); it != INVALID; ++it) { |
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269 | ++num; |
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270 | } |
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271 | return num; |
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272 | } |
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273 | |
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274 | /// \brief Function to count the number of the out-arcs from node \c n. |
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275 | /// |
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276 | /// This function counts the number of the out-arcs from node \c n |
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277 | /// in the graph \c g. |
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278 | template <typename Graph> |
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279 | inline int countOutArcs(const Graph& g, const typename Graph::Node& n) { |
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280 | return countNodeDegree<Graph, typename Graph::OutArcIt>(g, n); |
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281 | } |
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282 | |
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283 | /// \brief Function to count the number of the in-arcs to node \c n. |
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284 | /// |
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285 | /// This function counts the number of the in-arcs to node \c n |
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286 | /// in the graph \c g. |
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287 | template <typename Graph> |
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288 | inline int countInArcs(const Graph& g, const typename Graph::Node& n) { |
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289 | return countNodeDegree<Graph, typename Graph::InArcIt>(g, n); |
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290 | } |
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291 | |
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292 | /// \brief Function to count the number of the inc-edges to node \c n. |
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293 | /// |
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294 | /// This function counts the number of the inc-edges to node \c n |
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295 | /// in the undirected graph \c g. |
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296 | template <typename Graph> |
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297 | inline int countIncEdges(const Graph& g, const typename Graph::Node& n) { |
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298 | return countNodeDegree<Graph, typename Graph::IncEdgeIt>(g, n); |
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299 | } |
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300 | |
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301 | namespace _core_bits { |
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302 | |
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303 | template <typename Digraph, typename Item, typename RefMap> |
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304 | class MapCopyBase { |
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305 | public: |
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306 | virtual void copy(const Digraph& from, const RefMap& refMap) = 0; |
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307 | |
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308 | virtual ~MapCopyBase() {} |
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309 | }; |
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310 | |
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311 | template <typename Digraph, typename Item, typename RefMap, |
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312 | typename FromMap, typename ToMap> |
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313 | class MapCopy : public MapCopyBase<Digraph, Item, RefMap> { |
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314 | public: |
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315 | |
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316 | MapCopy(const FromMap& map, ToMap& tmap) |
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317 | : _map(map), _tmap(tmap) {} |
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318 | |
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319 | virtual void copy(const Digraph& digraph, const RefMap& refMap) { |
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320 | typedef typename ItemSetTraits<Digraph, Item>::ItemIt ItemIt; |
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321 | for (ItemIt it(digraph); it != INVALID; ++it) { |
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322 | _tmap.set(refMap[it], _map[it]); |
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323 | } |
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324 | } |
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325 | |
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326 | private: |
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327 | const FromMap& _map; |
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328 | ToMap& _tmap; |
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329 | }; |
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330 | |
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331 | template <typename Digraph, typename Item, typename RefMap, typename It> |
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332 | class ItemCopy : public MapCopyBase<Digraph, Item, RefMap> { |
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333 | public: |
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334 | |
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335 | ItemCopy(const Item& item, It& it) : _item(item), _it(it) {} |
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336 | |
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337 | virtual void copy(const Digraph&, const RefMap& refMap) { |
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338 | _it = refMap[_item]; |
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339 | } |
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340 | |
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341 | private: |
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342 | Item _item; |
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343 | It& _it; |
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344 | }; |
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345 | |
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346 | template <typename Digraph, typename Item, typename RefMap, typename Ref> |
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347 | class RefCopy : public MapCopyBase<Digraph, Item, RefMap> { |
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348 | public: |
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349 | |
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350 | RefCopy(Ref& map) : _map(map) {} |
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351 | |
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352 | virtual void copy(const Digraph& digraph, const RefMap& refMap) { |
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353 | typedef typename ItemSetTraits<Digraph, Item>::ItemIt ItemIt; |
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354 | for (ItemIt it(digraph); it != INVALID; ++it) { |
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355 | _map.set(it, refMap[it]); |
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356 | } |
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357 | } |
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358 | |
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359 | private: |
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360 | Ref& _map; |
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361 | }; |
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362 | |
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363 | template <typename Digraph, typename Item, typename RefMap, |
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364 | typename CrossRef> |
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365 | class CrossRefCopy : public MapCopyBase<Digraph, Item, RefMap> { |
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366 | public: |
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367 | |
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368 | CrossRefCopy(CrossRef& cmap) : _cmap(cmap) {} |
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369 | |
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370 | virtual void copy(const Digraph& digraph, const RefMap& refMap) { |
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371 | typedef typename ItemSetTraits<Digraph, Item>::ItemIt ItemIt; |
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372 | for (ItemIt it(digraph); it != INVALID; ++it) { |
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373 | _cmap.set(refMap[it], it); |
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374 | } |
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375 | } |
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376 | |
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377 | private: |
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378 | CrossRef& _cmap; |
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379 | }; |
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380 | |
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381 | template <typename Digraph, typename Enable = void> |
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382 | struct DigraphCopySelector { |
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383 | template <typename From, typename NodeRefMap, typename ArcRefMap> |
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384 | static void copy(const From& from, Digraph &to, |
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385 | NodeRefMap& nodeRefMap, ArcRefMap& arcRefMap) { |
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386 | for (typename From::NodeIt it(from); it != INVALID; ++it) { |
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387 | nodeRefMap[it] = to.addNode(); |
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388 | } |
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389 | for (typename From::ArcIt it(from); it != INVALID; ++it) { |
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390 | arcRefMap[it] = to.addArc(nodeRefMap[from.source(it)], |
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391 | nodeRefMap[from.target(it)]); |
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392 | } |
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393 | } |
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394 | }; |
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395 | |
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396 | template <typename Digraph> |
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397 | struct DigraphCopySelector< |
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398 | Digraph, |
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399 | typename enable_if<typename Digraph::BuildTag, void>::type> |
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400 | { |
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401 | template <typename From, typename NodeRefMap, typename ArcRefMap> |
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402 | static void copy(const From& from, Digraph &to, |
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403 | NodeRefMap& nodeRefMap, ArcRefMap& arcRefMap) { |
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404 | to.build(from, nodeRefMap, arcRefMap); |
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405 | } |
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406 | }; |
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407 | |
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408 | template <typename Graph, typename Enable = void> |
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409 | struct GraphCopySelector { |
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410 | template <typename From, typename NodeRefMap, typename EdgeRefMap> |
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411 | static void copy(const From& from, Graph &to, |
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412 | NodeRefMap& nodeRefMap, EdgeRefMap& edgeRefMap) { |
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413 | for (typename From::NodeIt it(from); it != INVALID; ++it) { |
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414 | nodeRefMap[it] = to.addNode(); |
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415 | } |
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416 | for (typename From::EdgeIt it(from); it != INVALID; ++it) { |
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417 | edgeRefMap[it] = to.addEdge(nodeRefMap[from.u(it)], |
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418 | nodeRefMap[from.v(it)]); |
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419 | } |
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420 | } |
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421 | }; |
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422 | |
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423 | template <typename Graph> |
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424 | struct GraphCopySelector< |
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425 | Graph, |
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426 | typename enable_if<typename Graph::BuildTag, void>::type> |
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427 | { |
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428 | template <typename From, typename NodeRefMap, typename EdgeRefMap> |
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429 | static void copy(const From& from, Graph &to, |
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430 | NodeRefMap& nodeRefMap, EdgeRefMap& edgeRefMap) { |
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431 | to.build(from, nodeRefMap, edgeRefMap); |
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432 | } |
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433 | }; |
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434 | |
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435 | } |
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436 | |
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437 | /// \brief Class to copy a digraph. |
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438 | /// |
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439 | /// Class to copy a digraph to another digraph (duplicate a digraph). The |
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440 | /// simplest way of using it is through the \c digraphCopy() function. |
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441 | /// |
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442 | /// This class not only make a copy of a digraph, but it can create |
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443 | /// references and cross references between the nodes and arcs of |
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444 | /// the two digraphs, and it can copy maps to use with the newly created |
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445 | /// digraph. |
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446 | /// |
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447 | /// To make a copy from a digraph, first an instance of DigraphCopy |
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448 | /// should be created, then the data belongs to the digraph should |
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449 | /// assigned to copy. In the end, the \c run() member should be |
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450 | /// called. |
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451 | /// |
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452 | /// The next code copies a digraph with several data: |
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453 | ///\code |
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454 | /// DigraphCopy<OrigGraph, NewGraph> cg(orig_graph, new_graph); |
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455 | /// // Create references for the nodes |
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456 | /// OrigGraph::NodeMap<NewGraph::Node> nr(orig_graph); |
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457 | /// cg.nodeRef(nr); |
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458 | /// // Create cross references (inverse) for the arcs |
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459 | /// NewGraph::ArcMap<OrigGraph::Arc> acr(new_graph); |
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460 | /// cg.arcCrossRef(acr); |
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461 | /// // Copy an arc map |
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462 | /// OrigGraph::ArcMap<double> oamap(orig_graph); |
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463 | /// NewGraph::ArcMap<double> namap(new_graph); |
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464 | /// cg.arcMap(oamap, namap); |
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465 | /// // Copy a node |
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466 | /// OrigGraph::Node on; |
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467 | /// NewGraph::Node nn; |
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468 | /// cg.node(on, nn); |
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469 | /// // Execute copying |
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470 | /// cg.run(); |
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471 | ///\endcode |
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472 | template <typename From, typename To> |
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473 | class DigraphCopy { |
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474 | private: |
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475 | |
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476 | typedef typename From::Node Node; |
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477 | typedef typename From::NodeIt NodeIt; |
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478 | typedef typename From::Arc Arc; |
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479 | typedef typename From::ArcIt ArcIt; |
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480 | |
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481 | typedef typename To::Node TNode; |
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482 | typedef typename To::Arc TArc; |
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483 | |
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484 | typedef typename From::template NodeMap<TNode> NodeRefMap; |
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485 | typedef typename From::template ArcMap<TArc> ArcRefMap; |
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486 | |
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487 | public: |
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488 | |
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489 | /// \brief Constructor of DigraphCopy. |
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490 | /// |
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491 | /// Constructor of DigraphCopy for copying the content of the |
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492 | /// \c from digraph into the \c to digraph. |
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493 | DigraphCopy(const From& from, To& to) |
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494 | : _from(from), _to(to) {} |
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495 | |
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496 | /// \brief Destructor of DigraphCopy |
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497 | /// |
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498 | /// Destructor of DigraphCopy. |
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499 | ~DigraphCopy() { |
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500 | for (int i = 0; i < int(_node_maps.size()); ++i) { |
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501 | delete _node_maps[i]; |
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502 | } |
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503 | for (int i = 0; i < int(_arc_maps.size()); ++i) { |
---|
504 | delete _arc_maps[i]; |
---|
505 | } |
---|
506 | |
---|
507 | } |
---|
508 | |
---|
509 | /// \brief Copy the node references into the given map. |
---|
510 | /// |
---|
511 | /// This function copies the node references into the given map. |
---|
512 | /// The parameter should be a map, whose key type is the Node type of |
---|
513 | /// the source digraph, while the value type is the Node type of the |
---|
514 | /// destination digraph. |
---|
515 | template <typename NodeRef> |
---|
516 | DigraphCopy& nodeRef(NodeRef& map) { |
---|
517 | _node_maps.push_back(new _core_bits::RefCopy<From, Node, |
---|
518 | NodeRefMap, NodeRef>(map)); |
---|
519 | return *this; |
---|
520 | } |
---|
521 | |
---|
522 | /// \brief Copy the node cross references into the given map. |
---|
523 | /// |
---|
524 | /// This function copies the node cross references (reverse references) |
---|
525 | /// into the given map. The parameter should be a map, whose key type |
---|
526 | /// is the Node type of the destination digraph, while the value type is |
---|
527 | /// the Node type of the source digraph. |
---|
528 | template <typename NodeCrossRef> |
---|
529 | DigraphCopy& nodeCrossRef(NodeCrossRef& map) { |
---|
530 | _node_maps.push_back(new _core_bits::CrossRefCopy<From, Node, |
---|
531 | NodeRefMap, NodeCrossRef>(map)); |
---|
532 | return *this; |
---|
533 | } |
---|
534 | |
---|
535 | /// \brief Make a copy of the given node map. |
---|
536 | /// |
---|
537 | /// This function makes a copy of the given node map for the newly |
---|
538 | /// created digraph. |
---|
539 | /// The key type of the new map \c tmap should be the Node type of the |
---|
540 | /// destination digraph, and the key type of the original map \c map |
---|
541 | /// should be the Node type of the source digraph. |
---|
542 | template <typename FromMap, typename ToMap> |
---|
543 | DigraphCopy& nodeMap(const FromMap& map, ToMap& tmap) { |
---|
544 | _node_maps.push_back(new _core_bits::MapCopy<From, Node, |
---|
545 | NodeRefMap, FromMap, ToMap>(map, tmap)); |
---|
546 | return *this; |
---|
547 | } |
---|
548 | |
---|
549 | /// \brief Make a copy of the given node. |
---|
550 | /// |
---|
551 | /// This function makes a copy of the given node. |
---|
552 | DigraphCopy& node(const Node& node, TNode& tnode) { |
---|
553 | _node_maps.push_back(new _core_bits::ItemCopy<From, Node, |
---|
554 | NodeRefMap, TNode>(node, tnode)); |
---|
555 | return *this; |
---|
556 | } |
---|
557 | |
---|
558 | /// \brief Copy the arc references into the given map. |
---|
559 | /// |
---|
560 | /// This function copies the arc references into the given map. |
---|
561 | /// The parameter should be a map, whose key type is the Arc type of |
---|
562 | /// the source digraph, while the value type is the Arc type of the |
---|
563 | /// destination digraph. |
---|
564 | template <typename ArcRef> |
---|
565 | DigraphCopy& arcRef(ArcRef& map) { |
---|
566 | _arc_maps.push_back(new _core_bits::RefCopy<From, Arc, |
---|
567 | ArcRefMap, ArcRef>(map)); |
---|
568 | return *this; |
---|
569 | } |
---|
570 | |
---|
571 | /// \brief Copy the arc cross references into the given map. |
---|
572 | /// |
---|
573 | /// This function copies the arc cross references (reverse references) |
---|
574 | /// into the given map. The parameter should be a map, whose key type |
---|
575 | /// is the Arc type of the destination digraph, while the value type is |
---|
576 | /// the Arc type of the source digraph. |
---|
577 | template <typename ArcCrossRef> |
---|
578 | DigraphCopy& arcCrossRef(ArcCrossRef& map) { |
---|
579 | _arc_maps.push_back(new _core_bits::CrossRefCopy<From, Arc, |
---|
580 | ArcRefMap, ArcCrossRef>(map)); |
---|
581 | return *this; |
---|
582 | } |
---|
583 | |
---|
584 | /// \brief Make a copy of the given arc map. |
---|
585 | /// |
---|
586 | /// This function makes a copy of the given arc map for the newly |
---|
587 | /// created digraph. |
---|
588 | /// The key type of the new map \c tmap should be the Arc type of the |
---|
589 | /// destination digraph, and the key type of the original map \c map |
---|
590 | /// should be the Arc type of the source digraph. |
---|
591 | template <typename FromMap, typename ToMap> |
---|
592 | DigraphCopy& arcMap(const FromMap& map, ToMap& tmap) { |
---|
593 | _arc_maps.push_back(new _core_bits::MapCopy<From, Arc, |
---|
594 | ArcRefMap, FromMap, ToMap>(map, tmap)); |
---|
595 | return *this; |
---|
596 | } |
---|
597 | |
---|
598 | /// \brief Make a copy of the given arc. |
---|
599 | /// |
---|
600 | /// This function makes a copy of the given arc. |
---|
601 | DigraphCopy& arc(const Arc& arc, TArc& tarc) { |
---|
602 | _arc_maps.push_back(new _core_bits::ItemCopy<From, Arc, |
---|
603 | ArcRefMap, TArc>(arc, tarc)); |
---|
604 | return *this; |
---|
605 | } |
---|
606 | |
---|
607 | /// \brief Execute copying. |
---|
608 | /// |
---|
609 | /// This function executes the copying of the digraph along with the |
---|
610 | /// copying of the assigned data. |
---|
611 | void run() { |
---|
612 | NodeRefMap nodeRefMap(_from); |
---|
613 | ArcRefMap arcRefMap(_from); |
---|
614 | _core_bits::DigraphCopySelector<To>:: |
---|
615 | copy(_from, _to, nodeRefMap, arcRefMap); |
---|
616 | for (int i = 0; i < int(_node_maps.size()); ++i) { |
---|
617 | _node_maps[i]->copy(_from, nodeRefMap); |
---|
618 | } |
---|
619 | for (int i = 0; i < int(_arc_maps.size()); ++i) { |
---|
620 | _arc_maps[i]->copy(_from, arcRefMap); |
---|
621 | } |
---|
622 | } |
---|
623 | |
---|
624 | protected: |
---|
625 | |
---|
626 | const From& _from; |
---|
627 | To& _to; |
---|
628 | |
---|
629 | std::vector<_core_bits::MapCopyBase<From, Node, NodeRefMap>* > |
---|
630 | _node_maps; |
---|
631 | |
---|
632 | std::vector<_core_bits::MapCopyBase<From, Arc, ArcRefMap>* > |
---|
633 | _arc_maps; |
---|
634 | |
---|
635 | }; |
---|
636 | |
---|
637 | /// \brief Copy a digraph to another digraph. |
---|
638 | /// |
---|
639 | /// This function copies a digraph to another digraph. |
---|
640 | /// The complete usage of it is detailed in the DigraphCopy class, but |
---|
641 | /// a short example shows a basic work: |
---|
642 | ///\code |
---|
643 | /// digraphCopy(src, trg).nodeRef(nr).arcCrossRef(acr).run(); |
---|
644 | ///\endcode |
---|
645 | /// |
---|
646 | /// After the copy the \c nr map will contain the mapping from the |
---|
647 | /// nodes of the \c from digraph to the nodes of the \c to digraph and |
---|
648 | /// \c acr will contain the mapping from the arcs of the \c to digraph |
---|
649 | /// to the arcs of the \c from digraph. |
---|
650 | /// |
---|
651 | /// \see DigraphCopy |
---|
652 | template <typename From, typename To> |
---|
653 | DigraphCopy<From, To> digraphCopy(const From& from, To& to) { |
---|
654 | return DigraphCopy<From, To>(from, to); |
---|
655 | } |
---|
656 | |
---|
657 | /// \brief Class to copy a graph. |
---|
658 | /// |
---|
659 | /// Class to copy a graph to another graph (duplicate a graph). The |
---|
660 | /// simplest way of using it is through the \c graphCopy() function. |
---|
661 | /// |
---|
662 | /// This class not only make a copy of a graph, but it can create |
---|
663 | /// references and cross references between the nodes, edges and arcs of |
---|
664 | /// the two graphs, and it can copy maps for using with the newly created |
---|
665 | /// graph. |
---|
666 | /// |
---|
667 | /// To make a copy from a graph, first an instance of GraphCopy |
---|
668 | /// should be created, then the data belongs to the graph should |
---|
669 | /// assigned to copy. In the end, the \c run() member should be |
---|
670 | /// called. |
---|
671 | /// |
---|
672 | /// The next code copies a graph with several data: |
---|
673 | ///\code |
---|
674 | /// GraphCopy<OrigGraph, NewGraph> cg(orig_graph, new_graph); |
---|
675 | /// // Create references for the nodes |
---|
676 | /// OrigGraph::NodeMap<NewGraph::Node> nr(orig_graph); |
---|
677 | /// cg.nodeRef(nr); |
---|
678 | /// // Create cross references (inverse) for the edges |
---|
679 | /// NewGraph::EdgeMap<OrigGraph::Edge> ecr(new_graph); |
---|
680 | /// cg.edgeCrossRef(ecr); |
---|
681 | /// // Copy an edge map |
---|
682 | /// OrigGraph::EdgeMap<double> oemap(orig_graph); |
---|
683 | /// NewGraph::EdgeMap<double> nemap(new_graph); |
---|
684 | /// cg.edgeMap(oemap, nemap); |
---|
685 | /// // Copy a node |
---|
686 | /// OrigGraph::Node on; |
---|
687 | /// NewGraph::Node nn; |
---|
688 | /// cg.node(on, nn); |
---|
689 | /// // Execute copying |
---|
690 | /// cg.run(); |
---|
691 | ///\endcode |
---|
692 | template <typename From, typename To> |
---|
693 | class GraphCopy { |
---|
694 | private: |
---|
695 | |
---|
696 | typedef typename From::Node Node; |
---|
697 | typedef typename From::NodeIt NodeIt; |
---|
698 | typedef typename From::Arc Arc; |
---|
699 | typedef typename From::ArcIt ArcIt; |
---|
700 | typedef typename From::Edge Edge; |
---|
701 | typedef typename From::EdgeIt EdgeIt; |
---|
702 | |
---|
703 | typedef typename To::Node TNode; |
---|
704 | typedef typename To::Arc TArc; |
---|
705 | typedef typename To::Edge TEdge; |
---|
706 | |
---|
707 | typedef typename From::template NodeMap<TNode> NodeRefMap; |
---|
708 | typedef typename From::template EdgeMap<TEdge> EdgeRefMap; |
---|
709 | |
---|
710 | struct ArcRefMap { |
---|
711 | ArcRefMap(const From& from, const To& to, |
---|
712 | const EdgeRefMap& edge_ref, const NodeRefMap& node_ref) |
---|
713 | : _from(from), _to(to), |
---|
714 | _edge_ref(edge_ref), _node_ref(node_ref) {} |
---|
715 | |
---|
716 | typedef typename From::Arc Key; |
---|
717 | typedef typename To::Arc Value; |
---|
718 | |
---|
719 | Value operator[](const Key& key) const { |
---|
720 | bool forward = _from.u(key) != _from.v(key) ? |
---|
721 | _node_ref[_from.source(key)] == |
---|
722 | _to.source(_to.direct(_edge_ref[key], true)) : |
---|
723 | _from.direction(key); |
---|
724 | return _to.direct(_edge_ref[key], forward); |
---|
725 | } |
---|
726 | |
---|
727 | const From& _from; |
---|
728 | const To& _to; |
---|
729 | const EdgeRefMap& _edge_ref; |
---|
730 | const NodeRefMap& _node_ref; |
---|
731 | }; |
---|
732 | |
---|
733 | public: |
---|
734 | |
---|
735 | /// \brief Constructor of GraphCopy. |
---|
736 | /// |
---|
737 | /// Constructor of GraphCopy for copying the content of the |
---|
738 | /// \c from graph into the \c to graph. |
---|
739 | GraphCopy(const From& from, To& to) |
---|
740 | : _from(from), _to(to) {} |
---|
741 | |
---|
742 | /// \brief Destructor of GraphCopy |
---|
743 | /// |
---|
744 | /// Destructor of GraphCopy. |
---|
745 | ~GraphCopy() { |
---|
746 | for (int i = 0; i < int(_node_maps.size()); ++i) { |
---|
747 | delete _node_maps[i]; |
---|
748 | } |
---|
749 | for (int i = 0; i < int(_arc_maps.size()); ++i) { |
---|
750 | delete _arc_maps[i]; |
---|
751 | } |
---|
752 | for (int i = 0; i < int(_edge_maps.size()); ++i) { |
---|
753 | delete _edge_maps[i]; |
---|
754 | } |
---|
755 | } |
---|
756 | |
---|
757 | /// \brief Copy the node references into the given map. |
---|
758 | /// |
---|
759 | /// This function copies the node references into the given map. |
---|
760 | /// The parameter should be a map, whose key type is the Node type of |
---|
761 | /// the source graph, while the value type is the Node type of the |
---|
762 | /// destination graph. |
---|
763 | template <typename NodeRef> |
---|
764 | GraphCopy& nodeRef(NodeRef& map) { |
---|
765 | _node_maps.push_back(new _core_bits::RefCopy<From, Node, |
---|
766 | NodeRefMap, NodeRef>(map)); |
---|
767 | return *this; |
---|
768 | } |
---|
769 | |
---|
770 | /// \brief Copy the node cross references into the given map. |
---|
771 | /// |
---|
772 | /// This function copies the node cross references (reverse references) |
---|
773 | /// into the given map. The parameter should be a map, whose key type |
---|
774 | /// is the Node type of the destination graph, while the value type is |
---|
775 | /// the Node type of the source graph. |
---|
776 | template <typename NodeCrossRef> |
---|
777 | GraphCopy& nodeCrossRef(NodeCrossRef& map) { |
---|
778 | _node_maps.push_back(new _core_bits::CrossRefCopy<From, Node, |
---|
779 | NodeRefMap, NodeCrossRef>(map)); |
---|
780 | return *this; |
---|
781 | } |
---|
782 | |
---|
783 | /// \brief Make a copy of the given node map. |
---|
784 | /// |
---|
785 | /// This function makes a copy of the given node map for the newly |
---|
786 | /// created graph. |
---|
787 | /// The key type of the new map \c tmap should be the Node type of the |
---|
788 | /// destination graph, and the key type of the original map \c map |
---|
789 | /// should be the Node type of the source graph. |
---|
790 | template <typename FromMap, typename ToMap> |
---|
791 | GraphCopy& nodeMap(const FromMap& map, ToMap& tmap) { |
---|
792 | _node_maps.push_back(new _core_bits::MapCopy<From, Node, |
---|
793 | NodeRefMap, FromMap, ToMap>(map, tmap)); |
---|
794 | return *this; |
---|
795 | } |
---|
796 | |
---|
797 | /// \brief Make a copy of the given node. |
---|
798 | /// |
---|
799 | /// This function makes a copy of the given node. |
---|
800 | GraphCopy& node(const Node& node, TNode& tnode) { |
---|
801 | _node_maps.push_back(new _core_bits::ItemCopy<From, Node, |
---|
802 | NodeRefMap, TNode>(node, tnode)); |
---|
803 | return *this; |
---|
804 | } |
---|
805 | |
---|
806 | /// \brief Copy the arc references into the given map. |
---|
807 | /// |
---|
808 | /// This function copies the arc references into the given map. |
---|
809 | /// The parameter should be a map, whose key type is the Arc type of |
---|
810 | /// the source graph, while the value type is the Arc type of the |
---|
811 | /// destination graph. |
---|
812 | template <typename ArcRef> |
---|
813 | GraphCopy& arcRef(ArcRef& map) { |
---|
814 | _arc_maps.push_back(new _core_bits::RefCopy<From, Arc, |
---|
815 | ArcRefMap, ArcRef>(map)); |
---|
816 | return *this; |
---|
817 | } |
---|
818 | |
---|
819 | /// \brief Copy the arc cross references into the given map. |
---|
820 | /// |
---|
821 | /// This function copies the arc cross references (reverse references) |
---|
822 | /// into the given map. The parameter should be a map, whose key type |
---|
823 | /// is the Arc type of the destination graph, while the value type is |
---|
824 | /// the Arc type of the source graph. |
---|
825 | template <typename ArcCrossRef> |
---|
826 | GraphCopy& arcCrossRef(ArcCrossRef& map) { |
---|
827 | _arc_maps.push_back(new _core_bits::CrossRefCopy<From, Arc, |
---|
828 | ArcRefMap, ArcCrossRef>(map)); |
---|
829 | return *this; |
---|
830 | } |
---|
831 | |
---|
832 | /// \brief Make a copy of the given arc map. |
---|
833 | /// |
---|
834 | /// This function makes a copy of the given arc map for the newly |
---|
835 | /// created graph. |
---|
836 | /// The key type of the new map \c tmap should be the Arc type of the |
---|
837 | /// destination graph, and the key type of the original map \c map |
---|
838 | /// should be the Arc type of the source graph. |
---|
839 | template <typename FromMap, typename ToMap> |
---|
840 | GraphCopy& arcMap(const FromMap& map, ToMap& tmap) { |
---|
841 | _arc_maps.push_back(new _core_bits::MapCopy<From, Arc, |
---|
842 | ArcRefMap, FromMap, ToMap>(map, tmap)); |
---|
843 | return *this; |
---|
844 | } |
---|
845 | |
---|
846 | /// \brief Make a copy of the given arc. |
---|
847 | /// |
---|
848 | /// This function makes a copy of the given arc. |
---|
849 | GraphCopy& arc(const Arc& arc, TArc& tarc) { |
---|
850 | _arc_maps.push_back(new _core_bits::ItemCopy<From, Arc, |
---|
851 | ArcRefMap, TArc>(arc, tarc)); |
---|
852 | return *this; |
---|
853 | } |
---|
854 | |
---|
855 | /// \brief Copy the edge references into the given map. |
---|
856 | /// |
---|
857 | /// This function copies the edge references into the given map. |
---|
858 | /// The parameter should be a map, whose key type is the Edge type of |
---|
859 | /// the source graph, while the value type is the Edge type of the |
---|
860 | /// destination graph. |
---|
861 | template <typename EdgeRef> |
---|
862 | GraphCopy& edgeRef(EdgeRef& map) { |
---|
863 | _edge_maps.push_back(new _core_bits::RefCopy<From, Edge, |
---|
864 | EdgeRefMap, EdgeRef>(map)); |
---|
865 | return *this; |
---|
866 | } |
---|
867 | |
---|
868 | /// \brief Copy the edge cross references into the given map. |
---|
869 | /// |
---|
870 | /// This function copies the edge cross references (reverse references) |
---|
871 | /// into the given map. The parameter should be a map, whose key type |
---|
872 | /// is the Edge type of the destination graph, while the value type is |
---|
873 | /// the Edge type of the source graph. |
---|
874 | template <typename EdgeCrossRef> |
---|
875 | GraphCopy& edgeCrossRef(EdgeCrossRef& map) { |
---|
876 | _edge_maps.push_back(new _core_bits::CrossRefCopy<From, |
---|
877 | Edge, EdgeRefMap, EdgeCrossRef>(map)); |
---|
878 | return *this; |
---|
879 | } |
---|
880 | |
---|
881 | /// \brief Make a copy of the given edge map. |
---|
882 | /// |
---|
883 | /// This function makes a copy of the given edge map for the newly |
---|
884 | /// created graph. |
---|
885 | /// The key type of the new map \c tmap should be the Edge type of the |
---|
886 | /// destination graph, and the key type of the original map \c map |
---|
887 | /// should be the Edge type of the source graph. |
---|
888 | template <typename FromMap, typename ToMap> |
---|
889 | GraphCopy& edgeMap(const FromMap& map, ToMap& tmap) { |
---|
890 | _edge_maps.push_back(new _core_bits::MapCopy<From, Edge, |
---|
891 | EdgeRefMap, FromMap, ToMap>(map, tmap)); |
---|
892 | return *this; |
---|
893 | } |
---|
894 | |
---|
895 | /// \brief Make a copy of the given edge. |
---|
896 | /// |
---|
897 | /// This function makes a copy of the given edge. |
---|
898 | GraphCopy& edge(const Edge& edge, TEdge& tedge) { |
---|
899 | _edge_maps.push_back(new _core_bits::ItemCopy<From, Edge, |
---|
900 | EdgeRefMap, TEdge>(edge, tedge)); |
---|
901 | return *this; |
---|
902 | } |
---|
903 | |
---|
904 | /// \brief Execute copying. |
---|
905 | /// |
---|
906 | /// This function executes the copying of the graph along with the |
---|
907 | /// copying of the assigned data. |
---|
908 | void run() { |
---|
909 | NodeRefMap nodeRefMap(_from); |
---|
910 | EdgeRefMap edgeRefMap(_from); |
---|
911 | ArcRefMap arcRefMap(_from, _to, edgeRefMap, nodeRefMap); |
---|
912 | _core_bits::GraphCopySelector<To>:: |
---|
913 | copy(_from, _to, nodeRefMap, edgeRefMap); |
---|
914 | for (int i = 0; i < int(_node_maps.size()); ++i) { |
---|
915 | _node_maps[i]->copy(_from, nodeRefMap); |
---|
916 | } |
---|
917 | for (int i = 0; i < int(_edge_maps.size()); ++i) { |
---|
918 | _edge_maps[i]->copy(_from, edgeRefMap); |
---|
919 | } |
---|
920 | for (int i = 0; i < int(_arc_maps.size()); ++i) { |
---|
921 | _arc_maps[i]->copy(_from, arcRefMap); |
---|
922 | } |
---|
923 | } |
---|
924 | |
---|
925 | private: |
---|
926 | |
---|
927 | const From& _from; |
---|
928 | To& _to; |
---|
929 | |
---|
930 | std::vector<_core_bits::MapCopyBase<From, Node, NodeRefMap>* > |
---|
931 | _node_maps; |
---|
932 | |
---|
933 | std::vector<_core_bits::MapCopyBase<From, Arc, ArcRefMap>* > |
---|
934 | _arc_maps; |
---|
935 | |
---|
936 | std::vector<_core_bits::MapCopyBase<From, Edge, EdgeRefMap>* > |
---|
937 | _edge_maps; |
---|
938 | |
---|
939 | }; |
---|
940 | |
---|
941 | /// \brief Copy a graph to another graph. |
---|
942 | /// |
---|
943 | /// This function copies a graph to another graph. |
---|
944 | /// The complete usage of it is detailed in the GraphCopy class, |
---|
945 | /// but a short example shows a basic work: |
---|
946 | ///\code |
---|
947 | /// graphCopy(src, trg).nodeRef(nr).edgeCrossRef(ecr).run(); |
---|
948 | ///\endcode |
---|
949 | /// |
---|
950 | /// After the copy the \c nr map will contain the mapping from the |
---|
951 | /// nodes of the \c from graph to the nodes of the \c to graph and |
---|
952 | /// \c ecr will contain the mapping from the edges of the \c to graph |
---|
953 | /// to the edges of the \c from graph. |
---|
954 | /// |
---|
955 | /// \see GraphCopy |
---|
956 | template <typename From, typename To> |
---|
957 | GraphCopy<From, To> |
---|
958 | graphCopy(const From& from, To& to) { |
---|
959 | return GraphCopy<From, To>(from, to); |
---|
960 | } |
---|
961 | |
---|
962 | namespace _core_bits { |
---|
963 | |
---|
964 | template <typename Graph, typename Enable = void> |
---|
965 | struct FindArcSelector { |
---|
966 | typedef typename Graph::Node Node; |
---|
967 | typedef typename Graph::Arc Arc; |
---|
968 | static Arc find(const Graph &g, Node u, Node v, Arc e) { |
---|
969 | if (e == INVALID) { |
---|
970 | g.firstOut(e, u); |
---|
971 | } else { |
---|
972 | g.nextOut(e); |
---|
973 | } |
---|
974 | while (e != INVALID && g.target(e) != v) { |
---|
975 | g.nextOut(e); |
---|
976 | } |
---|
977 | return e; |
---|
978 | } |
---|
979 | }; |
---|
980 | |
---|
981 | template <typename Graph> |
---|
982 | struct FindArcSelector< |
---|
983 | Graph, |
---|
984 | typename enable_if<typename Graph::FindArcTag, void>::type> |
---|
985 | { |
---|
986 | typedef typename Graph::Node Node; |
---|
987 | typedef typename Graph::Arc Arc; |
---|
988 | static Arc find(const Graph &g, Node u, Node v, Arc prev) { |
---|
989 | return g.findArc(u, v, prev); |
---|
990 | } |
---|
991 | }; |
---|
992 | } |
---|
993 | |
---|
994 | /// \brief Find an arc between two nodes of a digraph. |
---|
995 | /// |
---|
996 | /// This function finds an arc from node \c u to node \c v in the |
---|
997 | /// digraph \c g. |
---|
998 | /// |
---|
999 | /// If \c prev is \ref INVALID (this is the default value), then |
---|
1000 | /// it finds the first arc from \c u to \c v. Otherwise it looks for |
---|
1001 | /// the next arc from \c u to \c v after \c prev. |
---|
1002 | /// \return The found arc or \ref INVALID if there is no such an arc. |
---|
1003 | /// |
---|
1004 | /// Thus you can iterate through each arc from \c u to \c v as it follows. |
---|
1005 | ///\code |
---|
1006 | /// for(Arc e = findArc(g,u,v); e != INVALID; e = findArc(g,u,v,e)) { |
---|
1007 | /// ... |
---|
1008 | /// } |
---|
1009 | ///\endcode |
---|
1010 | /// |
---|
1011 | /// \note \ref ConArcIt provides iterator interface for the same |
---|
1012 | /// functionality. |
---|
1013 | /// |
---|
1014 | ///\sa ConArcIt |
---|
1015 | ///\sa ArcLookUp, AllArcLookUp, DynArcLookUp |
---|
1016 | template <typename Graph> |
---|
1017 | inline typename Graph::Arc |
---|
1018 | findArc(const Graph &g, typename Graph::Node u, typename Graph::Node v, |
---|
1019 | typename Graph::Arc prev = INVALID) { |
---|
1020 | return _core_bits::FindArcSelector<Graph>::find(g, u, v, prev); |
---|
1021 | } |
---|
1022 | |
---|
1023 | /// \brief Iterator for iterating on parallel arcs connecting the same nodes. |
---|
1024 | /// |
---|
1025 | /// Iterator for iterating on parallel arcs connecting the same nodes. It is |
---|
1026 | /// a higher level interface for the \ref findArc() function. You can |
---|
1027 | /// use it the following way: |
---|
1028 | ///\code |
---|
1029 | /// for (ConArcIt<Graph> it(g, src, trg); it != INVALID; ++it) { |
---|
1030 | /// ... |
---|
1031 | /// } |
---|
1032 | ///\endcode |
---|
1033 | /// |
---|
1034 | ///\sa findArc() |
---|
1035 | ///\sa ArcLookUp, AllArcLookUp, DynArcLookUp |
---|
1036 | template <typename _Graph> |
---|
1037 | class ConArcIt : public _Graph::Arc { |
---|
1038 | public: |
---|
1039 | |
---|
1040 | typedef _Graph Graph; |
---|
1041 | typedef typename Graph::Arc Parent; |
---|
1042 | |
---|
1043 | typedef typename Graph::Arc Arc; |
---|
1044 | typedef typename Graph::Node Node; |
---|
1045 | |
---|
1046 | /// \brief Constructor. |
---|
1047 | /// |
---|
1048 | /// Construct a new ConArcIt iterating on the arcs that |
---|
1049 | /// connects nodes \c u and \c v. |
---|
1050 | ConArcIt(const Graph& g, Node u, Node v) : _graph(g) { |
---|
1051 | Parent::operator=(findArc(_graph, u, v)); |
---|
1052 | } |
---|
1053 | |
---|
1054 | /// \brief Constructor. |
---|
1055 | /// |
---|
1056 | /// Construct a new ConArcIt that continues the iterating from arc \c a. |
---|
1057 | ConArcIt(const Graph& g, Arc a) : Parent(a), _graph(g) {} |
---|
1058 | |
---|
1059 | /// \brief Increment operator. |
---|
1060 | /// |
---|
1061 | /// It increments the iterator and gives back the next arc. |
---|
1062 | ConArcIt& operator++() { |
---|
1063 | Parent::operator=(findArc(_graph, _graph.source(*this), |
---|
1064 | _graph.target(*this), *this)); |
---|
1065 | return *this; |
---|
1066 | } |
---|
1067 | private: |
---|
1068 | const Graph& _graph; |
---|
1069 | }; |
---|
1070 | |
---|
1071 | namespace _core_bits { |
---|
1072 | |
---|
1073 | template <typename Graph, typename Enable = void> |
---|
1074 | struct FindEdgeSelector { |
---|
1075 | typedef typename Graph::Node Node; |
---|
1076 | typedef typename Graph::Edge Edge; |
---|
1077 | static Edge find(const Graph &g, Node u, Node v, Edge e) { |
---|
1078 | bool b; |
---|
1079 | if (u != v) { |
---|
1080 | if (e == INVALID) { |
---|
1081 | g.firstInc(e, b, u); |
---|
1082 | } else { |
---|
1083 | b = g.u(e) == u; |
---|
1084 | g.nextInc(e, b); |
---|
1085 | } |
---|
1086 | while (e != INVALID && (b ? g.v(e) : g.u(e)) != v) { |
---|
1087 | g.nextInc(e, b); |
---|
1088 | } |
---|
1089 | } else { |
---|
1090 | if (e == INVALID) { |
---|
1091 | g.firstInc(e, b, u); |
---|
1092 | } else { |
---|
1093 | b = true; |
---|
1094 | g.nextInc(e, b); |
---|
1095 | } |
---|
1096 | while (e != INVALID && (!b || g.v(e) != v)) { |
---|
1097 | g.nextInc(e, b); |
---|
1098 | } |
---|
1099 | } |
---|
1100 | return e; |
---|
1101 | } |
---|
1102 | }; |
---|
1103 | |
---|
1104 | template <typename Graph> |
---|
1105 | struct FindEdgeSelector< |
---|
1106 | Graph, |
---|
1107 | typename enable_if<typename Graph::FindEdgeTag, void>::type> |
---|
1108 | { |
---|
1109 | typedef typename Graph::Node Node; |
---|
1110 | typedef typename Graph::Edge Edge; |
---|
1111 | static Edge find(const Graph &g, Node u, Node v, Edge prev) { |
---|
1112 | return g.findEdge(u, v, prev); |
---|
1113 | } |
---|
1114 | }; |
---|
1115 | } |
---|
1116 | |
---|
1117 | /// \brief Find an edge between two nodes of a graph. |
---|
1118 | /// |
---|
1119 | /// This function finds an edge from node \c u to node \c v in graph \c g. |
---|
1120 | /// If node \c u and node \c v is equal then each loop edge |
---|
1121 | /// will be enumerated once. |
---|
1122 | /// |
---|
1123 | /// If \c prev is \ref INVALID (this is the default value), then |
---|
1124 | /// it finds the first edge from \c u to \c v. Otherwise it looks for |
---|
1125 | /// the next edge from \c u to \c v after \c prev. |
---|
1126 | /// \return The found edge or \ref INVALID if there is no such an edge. |
---|
1127 | /// |
---|
1128 | /// Thus you can iterate through each edge between \c u and \c v |
---|
1129 | /// as it follows. |
---|
1130 | ///\code |
---|
1131 | /// for(Edge e = findEdge(g,u,v); e != INVALID; e = findEdge(g,u,v,e)) { |
---|
1132 | /// ... |
---|
1133 | /// } |
---|
1134 | ///\endcode |
---|
1135 | /// |
---|
1136 | /// \note \ref ConEdgeIt provides iterator interface for the same |
---|
1137 | /// functionality. |
---|
1138 | /// |
---|
1139 | ///\sa ConEdgeIt |
---|
1140 | template <typename Graph> |
---|
1141 | inline typename Graph::Edge |
---|
1142 | findEdge(const Graph &g, typename Graph::Node u, typename Graph::Node v, |
---|
1143 | typename Graph::Edge p = INVALID) { |
---|
1144 | return _core_bits::FindEdgeSelector<Graph>::find(g, u, v, p); |
---|
1145 | } |
---|
1146 | |
---|
1147 | /// \brief Iterator for iterating on parallel edges connecting the same nodes. |
---|
1148 | /// |
---|
1149 | /// Iterator for iterating on parallel edges connecting the same nodes. |
---|
1150 | /// It is a higher level interface for the findEdge() function. You can |
---|
1151 | /// use it the following way: |
---|
1152 | ///\code |
---|
1153 | /// for (ConEdgeIt<Graph> it(g, u, v); it != INVALID; ++it) { |
---|
1154 | /// ... |
---|
1155 | /// } |
---|
1156 | ///\endcode |
---|
1157 | /// |
---|
1158 | ///\sa findEdge() |
---|
1159 | template <typename _Graph> |
---|
1160 | class ConEdgeIt : public _Graph::Edge { |
---|
1161 | public: |
---|
1162 | |
---|
1163 | typedef _Graph Graph; |
---|
1164 | typedef typename Graph::Edge Parent; |
---|
1165 | |
---|
1166 | typedef typename Graph::Edge Edge; |
---|
1167 | typedef typename Graph::Node Node; |
---|
1168 | |
---|
1169 | /// \brief Constructor. |
---|
1170 | /// |
---|
1171 | /// Construct a new ConEdgeIt iterating on the edges that |
---|
1172 | /// connects nodes \c u and \c v. |
---|
1173 | ConEdgeIt(const Graph& g, Node u, Node v) : _graph(g), _u(u), _v(v) { |
---|
1174 | Parent::operator=(findEdge(_graph, _u, _v)); |
---|
1175 | } |
---|
1176 | |
---|
1177 | /// \brief Constructor. |
---|
1178 | /// |
---|
1179 | /// Construct a new ConEdgeIt that continues iterating from edge \c e. |
---|
1180 | ConEdgeIt(const Graph& g, Edge e) : Parent(e), _graph(g) {} |
---|
1181 | |
---|
1182 | /// \brief Increment operator. |
---|
1183 | /// |
---|
1184 | /// It increments the iterator and gives back the next edge. |
---|
1185 | ConEdgeIt& operator++() { |
---|
1186 | Parent::operator=(findEdge(_graph, _u, _v, *this)); |
---|
1187 | return *this; |
---|
1188 | } |
---|
1189 | private: |
---|
1190 | const Graph& _graph; |
---|
1191 | Node _u, _v; |
---|
1192 | }; |
---|
1193 | |
---|
1194 | |
---|
1195 | ///Dynamic arc look-up between given endpoints. |
---|
1196 | |
---|
1197 | ///Using this class, you can find an arc in a digraph from a given |
---|
1198 | ///source to a given target in amortized time <em>O</em>(log<em>d</em>), |
---|
1199 | ///where <em>d</em> is the out-degree of the source node. |
---|
1200 | /// |
---|
1201 | ///It is possible to find \e all parallel arcs between two nodes with |
---|
1202 | ///the \c operator() member. |
---|
1203 | /// |
---|
1204 | ///This is a dynamic data structure. Consider to use \ref ArcLookUp or |
---|
1205 | ///\ref AllArcLookUp if your digraph is not changed so frequently. |
---|
1206 | /// |
---|
1207 | ///This class uses a self-adjusting binary search tree, the Splay tree |
---|
1208 | ///of Sleator and Tarjan to guarantee the logarithmic amortized |
---|
1209 | ///time bound for arc look-ups. This class also guarantees the |
---|
1210 | ///optimal time bound in a constant factor for any distribution of |
---|
1211 | ///queries. |
---|
1212 | /// |
---|
1213 | ///\tparam G The type of the underlying digraph. |
---|
1214 | /// |
---|
1215 | ///\sa ArcLookUp |
---|
1216 | ///\sa AllArcLookUp |
---|
1217 | template<class G> |
---|
1218 | class DynArcLookUp |
---|
1219 | : protected ItemSetTraits<G, typename G::Arc>::ItemNotifier::ObserverBase |
---|
1220 | { |
---|
1221 | public: |
---|
1222 | typedef typename ItemSetTraits<G, typename G::Arc> |
---|
1223 | ::ItemNotifier::ObserverBase Parent; |
---|
1224 | |
---|
1225 | TEMPLATE_DIGRAPH_TYPEDEFS(G); |
---|
1226 | typedef G Digraph; |
---|
1227 | |
---|
1228 | protected: |
---|
1229 | |
---|
1230 | class AutoNodeMap : public ItemSetTraits<G, Node>::template Map<Arc>::Type { |
---|
1231 | public: |
---|
1232 | |
---|
1233 | typedef typename ItemSetTraits<G, Node>::template Map<Arc>::Type Parent; |
---|
1234 | |
---|
1235 | AutoNodeMap(const G& digraph) : Parent(digraph, INVALID) {} |
---|
1236 | |
---|
1237 | virtual void add(const Node& node) { |
---|
1238 | Parent::add(node); |
---|
1239 | Parent::set(node, INVALID); |
---|
1240 | } |
---|
1241 | |
---|
1242 | virtual void add(const std::vector<Node>& nodes) { |
---|
1243 | Parent::add(nodes); |
---|
1244 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
1245 | Parent::set(nodes[i], INVALID); |
---|
1246 | } |
---|
1247 | } |
---|
1248 | |
---|
1249 | virtual void build() { |
---|
1250 | Parent::build(); |
---|
1251 | Node it; |
---|
1252 | typename Parent::Notifier* nf = Parent::notifier(); |
---|
1253 | for (nf->first(it); it != INVALID; nf->next(it)) { |
---|
1254 | Parent::set(it, INVALID); |
---|
1255 | } |
---|
1256 | } |
---|
1257 | }; |
---|
1258 | |
---|
1259 | const Digraph &_g; |
---|
1260 | AutoNodeMap _head; |
---|
1261 | typename Digraph::template ArcMap<Arc> _parent; |
---|
1262 | typename Digraph::template ArcMap<Arc> _left; |
---|
1263 | typename Digraph::template ArcMap<Arc> _right; |
---|
1264 | |
---|
1265 | class ArcLess { |
---|
1266 | const Digraph &g; |
---|
1267 | public: |
---|
1268 | ArcLess(const Digraph &_g) : g(_g) {} |
---|
1269 | bool operator()(Arc a,Arc b) const |
---|
1270 | { |
---|
1271 | return g.target(a)<g.target(b); |
---|
1272 | } |
---|
1273 | }; |
---|
1274 | |
---|
1275 | public: |
---|
1276 | |
---|
1277 | ///Constructor |
---|
1278 | |
---|
1279 | ///Constructor. |
---|
1280 | /// |
---|
1281 | ///It builds up the search database. |
---|
1282 | DynArcLookUp(const Digraph &g) |
---|
1283 | : _g(g),_head(g),_parent(g),_left(g),_right(g) |
---|
1284 | { |
---|
1285 | Parent::attach(_g.notifier(typename Digraph::Arc())); |
---|
1286 | refresh(); |
---|
1287 | } |
---|
1288 | |
---|
1289 | protected: |
---|
1290 | |
---|
1291 | virtual void add(const Arc& arc) { |
---|
1292 | insert(arc); |
---|
1293 | } |
---|
1294 | |
---|
1295 | virtual void add(const std::vector<Arc>& arcs) { |
---|
1296 | for (int i = 0; i < int(arcs.size()); ++i) { |
---|
1297 | insert(arcs[i]); |
---|
1298 | } |
---|
1299 | } |
---|
1300 | |
---|
1301 | virtual void erase(const Arc& arc) { |
---|
1302 | remove(arc); |
---|
1303 | } |
---|
1304 | |
---|
1305 | virtual void erase(const std::vector<Arc>& arcs) { |
---|
1306 | for (int i = 0; i < int(arcs.size()); ++i) { |
---|
1307 | remove(arcs[i]); |
---|
1308 | } |
---|
1309 | } |
---|
1310 | |
---|
1311 | virtual void build() { |
---|
1312 | refresh(); |
---|
1313 | } |
---|
1314 | |
---|
1315 | virtual void clear() { |
---|
1316 | for(NodeIt n(_g);n!=INVALID;++n) { |
---|
1317 | _head.set(n, INVALID); |
---|
1318 | } |
---|
1319 | } |
---|
1320 | |
---|
1321 | void insert(Arc arc) { |
---|
1322 | Node s = _g.source(arc); |
---|
1323 | Node t = _g.target(arc); |
---|
1324 | _left.set(arc, INVALID); |
---|
1325 | _right.set(arc, INVALID); |
---|
1326 | |
---|
1327 | Arc e = _head[s]; |
---|
1328 | if (e == INVALID) { |
---|
1329 | _head.set(s, arc); |
---|
1330 | _parent.set(arc, INVALID); |
---|
1331 | return; |
---|
1332 | } |
---|
1333 | while (true) { |
---|
1334 | if (t < _g.target(e)) { |
---|
1335 | if (_left[e] == INVALID) { |
---|
1336 | _left.set(e, arc); |
---|
1337 | _parent.set(arc, e); |
---|
1338 | splay(arc); |
---|
1339 | return; |
---|
1340 | } else { |
---|
1341 | e = _left[e]; |
---|
1342 | } |
---|
1343 | } else { |
---|
1344 | if (_right[e] == INVALID) { |
---|
1345 | _right.set(e, arc); |
---|
1346 | _parent.set(arc, e); |
---|
1347 | splay(arc); |
---|
1348 | return; |
---|
1349 | } else { |
---|
1350 | e = _right[e]; |
---|
1351 | } |
---|
1352 | } |
---|
1353 | } |
---|
1354 | } |
---|
1355 | |
---|
1356 | void remove(Arc arc) { |
---|
1357 | if (_left[arc] == INVALID) { |
---|
1358 | if (_right[arc] != INVALID) { |
---|
1359 | _parent.set(_right[arc], _parent[arc]); |
---|
1360 | } |
---|
1361 | if (_parent[arc] != INVALID) { |
---|
1362 | if (_left[_parent[arc]] == arc) { |
---|
1363 | _left.set(_parent[arc], _right[arc]); |
---|
1364 | } else { |
---|
1365 | _right.set(_parent[arc], _right[arc]); |
---|
1366 | } |
---|
1367 | } else { |
---|
1368 | _head.set(_g.source(arc), _right[arc]); |
---|
1369 | } |
---|
1370 | } else if (_right[arc] == INVALID) { |
---|
1371 | _parent.set(_left[arc], _parent[arc]); |
---|
1372 | if (_parent[arc] != INVALID) { |
---|
1373 | if (_left[_parent[arc]] == arc) { |
---|
1374 | _left.set(_parent[arc], _left[arc]); |
---|
1375 | } else { |
---|
1376 | _right.set(_parent[arc], _left[arc]); |
---|
1377 | } |
---|
1378 | } else { |
---|
1379 | _head.set(_g.source(arc), _left[arc]); |
---|
1380 | } |
---|
1381 | } else { |
---|
1382 | Arc e = _left[arc]; |
---|
1383 | if (_right[e] != INVALID) { |
---|
1384 | e = _right[e]; |
---|
1385 | while (_right[e] != INVALID) { |
---|
1386 | e = _right[e]; |
---|
1387 | } |
---|
1388 | Arc s = _parent[e]; |
---|
1389 | _right.set(_parent[e], _left[e]); |
---|
1390 | if (_left[e] != INVALID) { |
---|
1391 | _parent.set(_left[e], _parent[e]); |
---|
1392 | } |
---|
1393 | |
---|
1394 | _left.set(e, _left[arc]); |
---|
1395 | _parent.set(_left[arc], e); |
---|
1396 | _right.set(e, _right[arc]); |
---|
1397 | _parent.set(_right[arc], e); |
---|
1398 | |
---|
1399 | _parent.set(e, _parent[arc]); |
---|
1400 | if (_parent[arc] != INVALID) { |
---|
1401 | if (_left[_parent[arc]] == arc) { |
---|
1402 | _left.set(_parent[arc], e); |
---|
1403 | } else { |
---|
1404 | _right.set(_parent[arc], e); |
---|
1405 | } |
---|
1406 | } |
---|
1407 | splay(s); |
---|
1408 | } else { |
---|
1409 | _right.set(e, _right[arc]); |
---|
1410 | _parent.set(_right[arc], e); |
---|
1411 | _parent.set(e, _parent[arc]); |
---|
1412 | |
---|
1413 | if (_parent[arc] != INVALID) { |
---|
1414 | if (_left[_parent[arc]] == arc) { |
---|
1415 | _left.set(_parent[arc], e); |
---|
1416 | } else { |
---|
1417 | _right.set(_parent[arc], e); |
---|
1418 | } |
---|
1419 | } else { |
---|
1420 | _head.set(_g.source(arc), e); |
---|
1421 | } |
---|
1422 | } |
---|
1423 | } |
---|
1424 | } |
---|
1425 | |
---|
1426 | Arc refreshRec(std::vector<Arc> &v,int a,int b) |
---|
1427 | { |
---|
1428 | int m=(a+b)/2; |
---|
1429 | Arc me=v[m]; |
---|
1430 | if (a < m) { |
---|
1431 | Arc left = refreshRec(v,a,m-1); |
---|
1432 | _left.set(me, left); |
---|
1433 | _parent.set(left, me); |
---|
1434 | } else { |
---|
1435 | _left.set(me, INVALID); |
---|
1436 | } |
---|
1437 | if (m < b) { |
---|
1438 | Arc right = refreshRec(v,m+1,b); |
---|
1439 | _right.set(me, right); |
---|
1440 | _parent.set(right, me); |
---|
1441 | } else { |
---|
1442 | _right.set(me, INVALID); |
---|
1443 | } |
---|
1444 | return me; |
---|
1445 | } |
---|
1446 | |
---|
1447 | void refresh() { |
---|
1448 | for(NodeIt n(_g);n!=INVALID;++n) { |
---|
1449 | std::vector<Arc> v; |
---|
1450 | for(OutArcIt a(_g,n);a!=INVALID;++a) v.push_back(a); |
---|
1451 | if (!v.empty()) { |
---|
1452 | std::sort(v.begin(),v.end(),ArcLess(_g)); |
---|
1453 | Arc head = refreshRec(v,0,v.size()-1); |
---|
1454 | _head.set(n, head); |
---|
1455 | _parent.set(head, INVALID); |
---|
1456 | } |
---|
1457 | else _head.set(n, INVALID); |
---|
1458 | } |
---|
1459 | } |
---|
1460 | |
---|
1461 | void zig(Arc v) { |
---|
1462 | Arc w = _parent[v]; |
---|
1463 | _parent.set(v, _parent[w]); |
---|
1464 | _parent.set(w, v); |
---|
1465 | _left.set(w, _right[v]); |
---|
1466 | _right.set(v, w); |
---|
1467 | if (_parent[v] != INVALID) { |
---|
1468 | if (_right[_parent[v]] == w) { |
---|
1469 | _right.set(_parent[v], v); |
---|
1470 | } else { |
---|
1471 | _left.set(_parent[v], v); |
---|
1472 | } |
---|
1473 | } |
---|
1474 | if (_left[w] != INVALID){ |
---|
1475 | _parent.set(_left[w], w); |
---|
1476 | } |
---|
1477 | } |
---|
1478 | |
---|
1479 | void zag(Arc v) { |
---|
1480 | Arc w = _parent[v]; |
---|
1481 | _parent.set(v, _parent[w]); |
---|
1482 | _parent.set(w, v); |
---|
1483 | _right.set(w, _left[v]); |
---|
1484 | _left.set(v, w); |
---|
1485 | if (_parent[v] != INVALID){ |
---|
1486 | if (_left[_parent[v]] == w) { |
---|
1487 | _left.set(_parent[v], v); |
---|
1488 | } else { |
---|
1489 | _right.set(_parent[v], v); |
---|
1490 | } |
---|
1491 | } |
---|
1492 | if (_right[w] != INVALID){ |
---|
1493 | _parent.set(_right[w], w); |
---|
1494 | } |
---|
1495 | } |
---|
1496 | |
---|
1497 | void splay(Arc v) { |
---|
1498 | while (_parent[v] != INVALID) { |
---|
1499 | if (v == _left[_parent[v]]) { |
---|
1500 | if (_parent[_parent[v]] == INVALID) { |
---|
1501 | zig(v); |
---|
1502 | } else { |
---|
1503 | if (_parent[v] == _left[_parent[_parent[v]]]) { |
---|
1504 | zig(_parent[v]); |
---|
1505 | zig(v); |
---|
1506 | } else { |
---|
1507 | zig(v); |
---|
1508 | zag(v); |
---|
1509 | } |
---|
1510 | } |
---|
1511 | } else { |
---|
1512 | if (_parent[_parent[v]] == INVALID) { |
---|
1513 | zag(v); |
---|
1514 | } else { |
---|
1515 | if (_parent[v] == _left[_parent[_parent[v]]]) { |
---|
1516 | zag(v); |
---|
1517 | zig(v); |
---|
1518 | } else { |
---|
1519 | zag(_parent[v]); |
---|
1520 | zag(v); |
---|
1521 | } |
---|
1522 | } |
---|
1523 | } |
---|
1524 | } |
---|
1525 | _head[_g.source(v)] = v; |
---|
1526 | } |
---|
1527 | |
---|
1528 | |
---|
1529 | public: |
---|
1530 | |
---|
1531 | ///Find an arc between two nodes. |
---|
1532 | |
---|
1533 | ///Find an arc between two nodes. |
---|
1534 | ///\param s The source node. |
---|
1535 | ///\param t The target node. |
---|
1536 | ///\param p The previous arc between \c s and \c t. It it is INVALID or |
---|
1537 | ///not given, the operator finds the first appropriate arc. |
---|
1538 | ///\return An arc from \c s to \c t after \c p or |
---|
1539 | ///\ref INVALID if there is no more. |
---|
1540 | /// |
---|
1541 | ///For example, you can count the number of arcs from \c u to \c v in the |
---|
1542 | ///following way. |
---|
1543 | ///\code |
---|
1544 | ///DynArcLookUp<ListDigraph> ae(g); |
---|
1545 | ///... |
---|
1546 | ///int n = 0; |
---|
1547 | ///for(Arc a = ae(u,v); a != INVALID; a = ae(u,v,a)) n++; |
---|
1548 | ///\endcode |
---|
1549 | /// |
---|
1550 | ///Finding the arcs take at most <em>O</em>(log<em>d</em>) |
---|
1551 | ///amortized time, specifically, the time complexity of the lookups |
---|
1552 | ///is equal to the optimal search tree implementation for the |
---|
1553 | ///current query distribution in a constant factor. |
---|
1554 | /// |
---|
1555 | ///\note This is a dynamic data structure, therefore the data |
---|
1556 | ///structure is updated after each graph alteration. Thus although |
---|
1557 | ///this data structure is theoretically faster than \ref ArcLookUp |
---|
1558 | ///and \ref AllArcLookUp, it often provides worse performance than |
---|
1559 | ///them. |
---|
1560 | Arc operator()(Node s, Node t, Arc p = INVALID) const { |
---|
1561 | if (p == INVALID) { |
---|
1562 | Arc a = _head[s]; |
---|
1563 | if (a == INVALID) return INVALID; |
---|
1564 | Arc r = INVALID; |
---|
1565 | while (true) { |
---|
1566 | if (_g.target(a) < t) { |
---|
1567 | if (_right[a] == INVALID) { |
---|
1568 | const_cast<DynArcLookUp&>(*this).splay(a); |
---|
1569 | return r; |
---|
1570 | } else { |
---|
1571 | a = _right[a]; |
---|
1572 | } |
---|
1573 | } else { |
---|
1574 | if (_g.target(a) == t) { |
---|
1575 | r = a; |
---|
1576 | } |
---|
1577 | if (_left[a] == INVALID) { |
---|
1578 | const_cast<DynArcLookUp&>(*this).splay(a); |
---|
1579 | return r; |
---|
1580 | } else { |
---|
1581 | a = _left[a]; |
---|
1582 | } |
---|
1583 | } |
---|
1584 | } |
---|
1585 | } else { |
---|
1586 | Arc a = p; |
---|
1587 | if (_right[a] != INVALID) { |
---|
1588 | a = _right[a]; |
---|
1589 | while (_left[a] != INVALID) { |
---|
1590 | a = _left[a]; |
---|
1591 | } |
---|
1592 | const_cast<DynArcLookUp&>(*this).splay(a); |
---|
1593 | } else { |
---|
1594 | while (_parent[a] != INVALID && _right[_parent[a]] == a) { |
---|
1595 | a = _parent[a]; |
---|
1596 | } |
---|
1597 | if (_parent[a] == INVALID) { |
---|
1598 | return INVALID; |
---|
1599 | } else { |
---|
1600 | a = _parent[a]; |
---|
1601 | const_cast<DynArcLookUp&>(*this).splay(a); |
---|
1602 | } |
---|
1603 | } |
---|
1604 | if (_g.target(a) == t) return a; |
---|
1605 | else return INVALID; |
---|
1606 | } |
---|
1607 | } |
---|
1608 | |
---|
1609 | }; |
---|
1610 | |
---|
1611 | ///Fast arc look-up between given endpoints. |
---|
1612 | |
---|
1613 | ///Using this class, you can find an arc in a digraph from a given |
---|
1614 | ///source to a given target in time <em>O</em>(log<em>d</em>), |
---|
1615 | ///where <em>d</em> is the out-degree of the source node. |
---|
1616 | /// |
---|
1617 | ///It is not possible to find \e all parallel arcs between two nodes. |
---|
1618 | ///Use \ref AllArcLookUp for this purpose. |
---|
1619 | /// |
---|
1620 | ///\warning This class is static, so you should call refresh() (or at |
---|
1621 | ///least refresh(Node)) to refresh this data structure whenever the |
---|
1622 | ///digraph changes. This is a time consuming (superlinearly proportional |
---|
1623 | ///(<em>O</em>(<em>m</em> log<em>m</em>)) to the number of arcs). |
---|
1624 | /// |
---|
1625 | ///\tparam G The type of the underlying digraph. |
---|
1626 | /// |
---|
1627 | ///\sa DynArcLookUp |
---|
1628 | ///\sa AllArcLookUp |
---|
1629 | template<class G> |
---|
1630 | class ArcLookUp |
---|
1631 | { |
---|
1632 | public: |
---|
1633 | TEMPLATE_DIGRAPH_TYPEDEFS(G); |
---|
1634 | typedef G Digraph; |
---|
1635 | |
---|
1636 | protected: |
---|
1637 | const Digraph &_g; |
---|
1638 | typename Digraph::template NodeMap<Arc> _head; |
---|
1639 | typename Digraph::template ArcMap<Arc> _left; |
---|
1640 | typename Digraph::template ArcMap<Arc> _right; |
---|
1641 | |
---|
1642 | class ArcLess { |
---|
1643 | const Digraph &g; |
---|
1644 | public: |
---|
1645 | ArcLess(const Digraph &_g) : g(_g) {} |
---|
1646 | bool operator()(Arc a,Arc b) const |
---|
1647 | { |
---|
1648 | return g.target(a)<g.target(b); |
---|
1649 | } |
---|
1650 | }; |
---|
1651 | |
---|
1652 | public: |
---|
1653 | |
---|
1654 | ///Constructor |
---|
1655 | |
---|
1656 | ///Constructor. |
---|
1657 | /// |
---|
1658 | ///It builds up the search database, which remains valid until the digraph |
---|
1659 | ///changes. |
---|
1660 | ArcLookUp(const Digraph &g) :_g(g),_head(g),_left(g),_right(g) {refresh();} |
---|
1661 | |
---|
1662 | private: |
---|
1663 | Arc refreshRec(std::vector<Arc> &v,int a,int b) |
---|
1664 | { |
---|
1665 | int m=(a+b)/2; |
---|
1666 | Arc me=v[m]; |
---|
1667 | _left[me] = a<m?refreshRec(v,a,m-1):INVALID; |
---|
1668 | _right[me] = m<b?refreshRec(v,m+1,b):INVALID; |
---|
1669 | return me; |
---|
1670 | } |
---|
1671 | public: |
---|
1672 | ///Refresh the search data structure at a node. |
---|
1673 | |
---|
1674 | ///Build up the search database of node \c n. |
---|
1675 | /// |
---|
1676 | ///It runs in time <em>O</em>(<em>d</em> log<em>d</em>), where <em>d</em> |
---|
1677 | ///is the number of the outgoing arcs of \c n. |
---|
1678 | void refresh(Node n) |
---|
1679 | { |
---|
1680 | std::vector<Arc> v; |
---|
1681 | for(OutArcIt e(_g,n);e!=INVALID;++e) v.push_back(e); |
---|
1682 | if(v.size()) { |
---|
1683 | std::sort(v.begin(),v.end(),ArcLess(_g)); |
---|
1684 | _head[n]=refreshRec(v,0,v.size()-1); |
---|
1685 | } |
---|
1686 | else _head[n]=INVALID; |
---|
1687 | } |
---|
1688 | ///Refresh the full data structure. |
---|
1689 | |
---|
1690 | ///Build up the full search database. In fact, it simply calls |
---|
1691 | ///\ref refresh(Node) "refresh(n)" for each node \c n. |
---|
1692 | /// |
---|
1693 | ///It runs in time <em>O</em>(<em>m</em> log<em>D</em>), where <em>m</em> is |
---|
1694 | ///the number of the arcs in the digraph and <em>D</em> is the maximum |
---|
1695 | ///out-degree of the digraph. |
---|
1696 | void refresh() |
---|
1697 | { |
---|
1698 | for(NodeIt n(_g);n!=INVALID;++n) refresh(n); |
---|
1699 | } |
---|
1700 | |
---|
1701 | ///Find an arc between two nodes. |
---|
1702 | |
---|
1703 | ///Find an arc between two nodes in time <em>O</em>(log<em>d</em>), |
---|
1704 | ///where <em>d</em> is the number of outgoing arcs of \c s. |
---|
1705 | ///\param s The source node. |
---|
1706 | ///\param t The target node. |
---|
1707 | ///\return An arc from \c s to \c t if there exists, |
---|
1708 | ///\ref INVALID otherwise. |
---|
1709 | /// |
---|
1710 | ///\warning If you change the digraph, refresh() must be called before using |
---|
1711 | ///this operator. If you change the outgoing arcs of |
---|
1712 | ///a single node \c n, then \ref refresh(Node) "refresh(n)" is enough. |
---|
1713 | Arc operator()(Node s, Node t) const |
---|
1714 | { |
---|
1715 | Arc e; |
---|
1716 | for(e=_head[s]; |
---|
1717 | e!=INVALID&&_g.target(e)!=t; |
---|
1718 | e = t < _g.target(e)?_left[e]:_right[e]) ; |
---|
1719 | return e; |
---|
1720 | } |
---|
1721 | |
---|
1722 | }; |
---|
1723 | |
---|
1724 | ///Fast look-up of all arcs between given endpoints. |
---|
1725 | |
---|
1726 | ///This class is the same as \ref ArcLookUp, with the addition |
---|
1727 | ///that it makes it possible to find all parallel arcs between given |
---|
1728 | ///endpoints. |
---|
1729 | /// |
---|
1730 | ///\warning This class is static, so you should call refresh() (or at |
---|
1731 | ///least refresh(Node)) to refresh this data structure whenever the |
---|
1732 | ///digraph changes. This is a time consuming (superlinearly proportional |
---|
1733 | ///(<em>O</em>(<em>m</em> log<em>m</em>)) to the number of arcs). |
---|
1734 | /// |
---|
1735 | ///\tparam G The type of the underlying digraph. |
---|
1736 | /// |
---|
1737 | ///\sa DynArcLookUp |
---|
1738 | ///\sa ArcLookUp |
---|
1739 | template<class G> |
---|
1740 | class AllArcLookUp : public ArcLookUp<G> |
---|
1741 | { |
---|
1742 | using ArcLookUp<G>::_g; |
---|
1743 | using ArcLookUp<G>::_right; |
---|
1744 | using ArcLookUp<G>::_left; |
---|
1745 | using ArcLookUp<G>::_head; |
---|
1746 | |
---|
1747 | TEMPLATE_DIGRAPH_TYPEDEFS(G); |
---|
1748 | typedef G Digraph; |
---|
1749 | |
---|
1750 | typename Digraph::template ArcMap<Arc> _next; |
---|
1751 | |
---|
1752 | Arc refreshNext(Arc head,Arc next=INVALID) |
---|
1753 | { |
---|
1754 | if(head==INVALID) return next; |
---|
1755 | else { |
---|
1756 | next=refreshNext(_right[head],next); |
---|
1757 | _next[head]=( next!=INVALID && _g.target(next)==_g.target(head)) |
---|
1758 | ? next : INVALID; |
---|
1759 | return refreshNext(_left[head],head); |
---|
1760 | } |
---|
1761 | } |
---|
1762 | |
---|
1763 | void refreshNext() |
---|
1764 | { |
---|
1765 | for(NodeIt n(_g);n!=INVALID;++n) refreshNext(_head[n]); |
---|
1766 | } |
---|
1767 | |
---|
1768 | public: |
---|
1769 | ///Constructor |
---|
1770 | |
---|
1771 | ///Constructor. |
---|
1772 | /// |
---|
1773 | ///It builds up the search database, which remains valid until the digraph |
---|
1774 | ///changes. |
---|
1775 | AllArcLookUp(const Digraph &g) : ArcLookUp<G>(g), _next(g) {refreshNext();} |
---|
1776 | |
---|
1777 | ///Refresh the data structure at a node. |
---|
1778 | |
---|
1779 | ///Build up the search database of node \c n. |
---|
1780 | /// |
---|
1781 | ///It runs in time <em>O</em>(<em>d</em> log<em>d</em>), where <em>d</em> is |
---|
1782 | ///the number of the outgoing arcs of \c n. |
---|
1783 | void refresh(Node n) |
---|
1784 | { |
---|
1785 | ArcLookUp<G>::refresh(n); |
---|
1786 | refreshNext(_head[n]); |
---|
1787 | } |
---|
1788 | |
---|
1789 | ///Refresh the full data structure. |
---|
1790 | |
---|
1791 | ///Build up the full search database. In fact, it simply calls |
---|
1792 | ///\ref refresh(Node) "refresh(n)" for each node \c n. |
---|
1793 | /// |
---|
1794 | ///It runs in time <em>O</em>(<em>m</em> log<em>D</em>), where <em>m</em> is |
---|
1795 | ///the number of the arcs in the digraph and <em>D</em> is the maximum |
---|
1796 | ///out-degree of the digraph. |
---|
1797 | void refresh() |
---|
1798 | { |
---|
1799 | for(NodeIt n(_g);n!=INVALID;++n) refresh(_head[n]); |
---|
1800 | } |
---|
1801 | |
---|
1802 | ///Find an arc between two nodes. |
---|
1803 | |
---|
1804 | ///Find an arc between two nodes. |
---|
1805 | ///\param s The source node. |
---|
1806 | ///\param t The target node. |
---|
1807 | ///\param prev The previous arc between \c s and \c t. It it is INVALID or |
---|
1808 | ///not given, the operator finds the first appropriate arc. |
---|
1809 | ///\return An arc from \c s to \c t after \c prev or |
---|
1810 | ///\ref INVALID if there is no more. |
---|
1811 | /// |
---|
1812 | ///For example, you can count the number of arcs from \c u to \c v in the |
---|
1813 | ///following way. |
---|
1814 | ///\code |
---|
1815 | ///AllArcLookUp<ListDigraph> ae(g); |
---|
1816 | ///... |
---|
1817 | ///int n = 0; |
---|
1818 | ///for(Arc a = ae(u,v); a != INVALID; a=ae(u,v,a)) n++; |
---|
1819 | ///\endcode |
---|
1820 | /// |
---|
1821 | ///Finding the first arc take <em>O</em>(log<em>d</em>) time, |
---|
1822 | ///where <em>d</em> is the number of outgoing arcs of \c s. Then the |
---|
1823 | ///consecutive arcs are found in constant time. |
---|
1824 | /// |
---|
1825 | ///\warning If you change the digraph, refresh() must be called before using |
---|
1826 | ///this operator. If you change the outgoing arcs of |
---|
1827 | ///a single node \c n, then \ref refresh(Node) "refresh(n)" is enough. |
---|
1828 | /// |
---|
1829 | #ifdef DOXYGEN |
---|
1830 | Arc operator()(Node s, Node t, Arc prev=INVALID) const {} |
---|
1831 | #else |
---|
1832 | using ArcLookUp<G>::operator() ; |
---|
1833 | Arc operator()(Node s, Node t, Arc prev) const |
---|
1834 | { |
---|
1835 | return prev==INVALID?(*this)(s,t):_next[prev]; |
---|
1836 | } |
---|
1837 | #endif |
---|
1838 | |
---|
1839 | }; |
---|
1840 | |
---|
1841 | /// @} |
---|
1842 | |
---|
1843 | } //namespace lemon |
---|
1844 | |
---|
1845 | #endif |
---|