1 | // -*- c++ -*- |
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2 | #ifndef HUGO_GRAPH_WRAPPER_H |
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3 | #define HUGO_GRAPH_WRAPPER_H |
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4 | |
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5 | ///\ingroup gwrappers |
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6 | ///\file |
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7 | ///\brief Several graph wrappers. |
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8 | /// |
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9 | ///This file contains several useful graph wrapper functions. |
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10 | /// |
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11 | ///\author Marton Makai |
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12 | |
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13 | #include <hugo/invalid.h> |
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14 | #include <hugo/maps.h> |
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15 | #include <iostream> |
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16 | |
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17 | namespace hugo { |
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18 | |
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19 | // Graph wrappers |
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20 | |
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21 | /// \addtogroup gwrappers |
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22 | /// A main parts of HUGOlib are the different graph structures, |
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23 | /// generic graph algorithms, graph concepts which couple these, and |
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24 | /// graph wrappers. While the previous ones are more or less clear, the |
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25 | /// latter notion needs further explanation. |
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26 | /// Graph wrappers are graph classes which serve for considering graph |
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27 | /// structures in different ways. A short example makes the notion much |
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28 | /// clearer. |
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29 | /// Suppose that we have an instance \c g of a directed graph |
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30 | /// type say \c ListGraph and an algorithm |
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31 | /// \code template<typename Graph> int algorithm(const Graph&); \endcode |
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32 | /// is needed to run on the reversely oriented graph. |
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33 | /// It may be expensive (in time or in memory usage) to copy |
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34 | /// \c g with the reverse orientation. |
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35 | /// Thus, a wrapper class |
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36 | /// \code template<typename Graph> class RevGraphWrapper; \endcode is used. |
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37 | /// The code looks as follows |
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38 | /// \code |
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39 | /// ListGraph g; |
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40 | /// RevGraphWrapper<ListGraph> rgw(g); |
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41 | /// int result=algorithm(rgw); |
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42 | /// \endcode |
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43 | /// After running the algorithm, the original graph \c g |
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44 | /// remains untouched. Thus the graph wrapper used above is to consider the |
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45 | /// original graph with reverse orientation. |
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46 | /// This techniques gives rise to an elegant code, and |
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47 | /// based on stable graph wrappers, complex algorithms can be |
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48 | /// implemented easily. |
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49 | /// In flow, circulation and bipartite matching problems, the residual |
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50 | /// graph is of particular importance. Combining a wrapper implementing |
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51 | /// this, shortest path algorithms and minimum mean cycle algorithms, |
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52 | /// a range of weighted and cardinality optimization algorithms can be |
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53 | /// obtained. For lack of space, for other examples, |
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54 | /// the interested user is referred to the detailed documentation of graph |
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55 | /// wrappers. |
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56 | /// The behavior of graph wrappers can be very different. Some of them keep |
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57 | /// capabilities of the original graph while in other cases this would be |
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58 | /// meaningless. This means that the concepts that they are a model of depend |
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59 | /// on the graph wrapper, and the wrapped graph(s). |
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60 | /// If an edge of \c rgw is deleted, this is carried out by |
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61 | /// deleting the corresponding edge of \c g. But for a residual |
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62 | /// graph, this operation has no sense. |
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63 | /// Let we stand one more example here to simplify your work. |
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64 | /// wrapper class |
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65 | /// \code template<typename Graph> class RevGraphWrapper; \endcode |
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66 | /// has constructor |
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67 | /// <tt> RevGraphWrapper(Graph& _g)</tt>. |
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68 | /// This means that in a situation, |
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69 | /// when a <tt> const ListGraph& </tt> reference to a graph is given, |
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70 | /// then it have to be instantiated with <tt>Graph=const ListGraph</tt>. |
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71 | /// \code |
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72 | /// int algorithm1(const ListGraph& g) { |
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73 | /// RevGraphWrapper<const ListGraph> rgw(g); |
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74 | /// return algorithm2(rgw); |
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75 | /// } |
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76 | /// \endcode |
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77 | |
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78 | /// \addtogroup gwrappers |
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79 | /// @{ |
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80 | |
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81 | ///Base type for the Graph Wrappers |
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82 | |
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83 | ///\warning Graph wrappers are in even more experimental state than the other |
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84 | ///parts of the lib. Use them at you own risk. |
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85 | /// |
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86 | ///This is the base type for the Graph Wrappers. |
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87 | ///\todo Some more docs... |
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88 | /// |
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89 | ///\author Marton Makai |
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90 | template<typename Graph> |
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91 | class GraphWrapper { |
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92 | protected: |
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93 | Graph* graph; |
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94 | GraphWrapper() : graph(0) { } |
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95 | void setGraph(Graph& _graph) { graph=&_graph; } |
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96 | |
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97 | public: |
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98 | typedef Graph BaseGraph; |
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99 | typedef Graph ParentGraph; |
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100 | |
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101 | GraphWrapper(Graph& _graph) : graph(&_graph) { } |
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102 | GraphWrapper(const GraphWrapper<Graph>& gw) : graph(gw.graph) { } |
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103 | |
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104 | typedef typename Graph::Node Node; |
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105 | class NodeIt : public Node { |
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106 | const GraphWrapper<Graph>* gw; |
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107 | friend class GraphWrapper<Graph>; |
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108 | public: |
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109 | NodeIt() { } |
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110 | NodeIt(Invalid i) : Node(i) { } |
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111 | NodeIt(const GraphWrapper<Graph>& _gw) : |
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112 | Node(typename Graph::NodeIt(*(_gw.graph))), gw(&_gw) { } |
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113 | NodeIt(const GraphWrapper<Graph>& _gw, const Node& n) : |
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114 | Node(n), gw(&_gw) { } |
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115 | NodeIt& operator++() { |
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116 | *(static_cast<Node*>(this))= |
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117 | ++(typename Graph::NodeIt(*(gw->graph), *this)); |
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118 | return *this; |
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119 | } |
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120 | }; |
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121 | typedef typename Graph::Edge Edge; |
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122 | class OutEdgeIt : public Edge { |
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123 | const GraphWrapper<Graph>* gw; |
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124 | friend class GraphWrapper<Graph>; |
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125 | public: |
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126 | OutEdgeIt() { } |
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127 | OutEdgeIt(Invalid i) : Edge(i) { } |
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128 | OutEdgeIt(const GraphWrapper<Graph>& _gw, const Node& n) : |
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129 | Edge(typename Graph::OutEdgeIt(*(_gw.graph), n)), gw(&_gw) { } |
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130 | OutEdgeIt(const GraphWrapper<Graph>& _gw, const Edge& e) : |
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131 | Edge(e), gw(&_gw) { } |
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132 | OutEdgeIt& operator++() { |
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133 | *(static_cast<Edge*>(this))= |
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134 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
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135 | return *this; |
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136 | } |
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137 | }; |
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138 | class InEdgeIt : public Edge { |
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139 | const GraphWrapper<Graph>* gw; |
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140 | friend class GraphWrapper<Graph>; |
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141 | public: |
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142 | InEdgeIt() { } |
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143 | InEdgeIt(Invalid i) : Edge(i) { } |
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144 | InEdgeIt(const GraphWrapper<Graph>& _gw, const Node& n) : |
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145 | Edge(typename Graph::InEdgeIt(*(_gw.graph), n)), gw(&_gw) { } |
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146 | InEdgeIt(const GraphWrapper<Graph>& _gw, const Edge& e) : |
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147 | Edge(e), gw(&_gw) { } |
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148 | InEdgeIt& operator++() { |
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149 | *(static_cast<Edge*>(this))= |
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150 | ++(typename Graph::InEdgeIt(*(gw->graph), *this)); |
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151 | return *this; |
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152 | } |
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153 | }; |
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154 | class EdgeIt : public Edge { |
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155 | const GraphWrapper<Graph>* gw; |
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156 | friend class GraphWrapper<Graph>; |
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157 | public: |
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158 | EdgeIt() { } |
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159 | EdgeIt(Invalid i) : Edge(i) { } |
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160 | EdgeIt(const GraphWrapper<Graph>& _gw) : |
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161 | Edge(typename Graph::EdgeIt(*(_gw.graph))), gw(&_gw) { } |
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162 | EdgeIt(const GraphWrapper<Graph>& _gw, const Edge& e) : |
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163 | Edge(e), gw(&_gw) { } |
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164 | EdgeIt& operator++() { |
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165 | *(static_cast<Edge*>(this))= |
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166 | ++(typename Graph::EdgeIt(*(gw->graph), *this)); |
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167 | return *this; |
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168 | } |
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169 | }; |
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170 | |
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171 | NodeIt& first(NodeIt& i) const { |
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172 | i=NodeIt(*this); return i; |
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173 | } |
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174 | OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { |
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175 | i=OutEdgeIt(*this, p); return i; |
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176 | } |
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177 | InEdgeIt& first(InEdgeIt& i, const Node& p) const { |
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178 | i=InEdgeIt(*this, p); return i; |
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179 | } |
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180 | EdgeIt& first(EdgeIt& i) const { |
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181 | i=EdgeIt(*this); return i; |
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182 | } |
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183 | |
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184 | Node tail(const Edge& e) const { |
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185 | return Node(graph->tail(static_cast<typename Graph::Edge>(e))); } |
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186 | Node head(const Edge& e) const { |
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187 | return Node(graph->head(static_cast<typename Graph::Edge>(e))); } |
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188 | |
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189 | int nodeNum() const { return graph->nodeNum(); } |
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190 | int edgeNum() const { return graph->edgeNum(); } |
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191 | |
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192 | Node addNode() const { return Node(graph->addNode()); } |
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193 | Edge addEdge(const Node& tail, const Node& head) const { |
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194 | return Edge(graph->addEdge(tail, head)); } |
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195 | |
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196 | void erase(const Node& i) const { graph->erase(i); } |
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197 | void erase(const Edge& i) const { graph->erase(i); } |
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198 | |
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199 | void clear() const { graph->clear(); } |
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200 | |
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201 | bool forward(const Edge& e) const { return graph->forward(e); } |
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202 | bool backward(const Edge& e) const { return graph->backward(e); } |
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203 | |
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204 | int id(const Node& v) const { return graph->id(v); } |
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205 | int id(const Edge& e) const { return graph->id(e); } |
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206 | |
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207 | Edge opposite(const Edge& e) const { return Edge(graph->opposite(e)); } |
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208 | |
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209 | |
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210 | IMPORT_NODE_MAP(Graph, *(gw.graph), GraphWrapper, gw); |
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211 | IMPORT_EDGE_MAP(Graph, *(gw.graph), GraphWrapper, gw); |
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212 | |
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213 | |
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214 | }; |
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215 | |
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216 | |
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217 | |
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218 | /// A graph wrapper which reverses the orientation of the edges. |
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219 | |
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220 | ///\warning Graph wrappers are in even more experimental state than the other |
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221 | ///parts of the lib. Use them at you own risk. |
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222 | /// |
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223 | /// A graph wrapper which reverses the orientation of the edges. |
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224 | /// Thus \c Graph have to be a directed graph type. |
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225 | /// |
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226 | ///\author Marton Makai |
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227 | template<typename Graph> |
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228 | class RevGraphWrapper : public GraphWrapper<Graph> { |
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229 | public: |
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230 | typedef GraphWrapper<Graph> Parent; |
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231 | protected: |
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232 | RevGraphWrapper() : GraphWrapper<Graph>() { } |
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233 | public: |
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234 | RevGraphWrapper(Graph& _graph) : GraphWrapper<Graph>(_graph) { } |
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235 | RevGraphWrapper(const RevGraphWrapper<Graph>& gw) : Parent(gw) { } |
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236 | |
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237 | typedef typename GraphWrapper<Graph>::Node Node; |
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238 | typedef typename GraphWrapper<Graph>::Edge Edge; |
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239 | //remark: OutEdgeIt and InEdgeIt cannot be typedef-ed to each other |
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240 | //because this does not work is some of them are not defined in the |
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241 | //original graph. The problem with this is that typedef-ed stuff |
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242 | //are instantiated in c++. |
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243 | class OutEdgeIt : public Edge { |
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244 | const RevGraphWrapper<Graph>* gw; |
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245 | friend class GraphWrapper<Graph>; |
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246 | public: |
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247 | OutEdgeIt() { } |
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248 | OutEdgeIt(Invalid i) : Edge(i) { } |
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249 | OutEdgeIt(const RevGraphWrapper<Graph>& _gw, const Node& n) : |
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250 | Edge(typename Graph::InEdgeIt(*(_gw.graph), n)), gw(&_gw) { } |
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251 | OutEdgeIt(const RevGraphWrapper<Graph>& _gw, const Edge& e) : |
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252 | Edge(e), gw(&_gw) { } |
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253 | OutEdgeIt& operator++() { |
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254 | *(static_cast<Edge*>(this))= |
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255 | ++(typename Graph::InEdgeIt(*(gw->graph), *this)); |
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256 | return *this; |
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257 | } |
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258 | }; |
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259 | class InEdgeIt : public Edge { |
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260 | const RevGraphWrapper<Graph>* gw; |
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261 | friend class GraphWrapper<Graph>; |
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262 | public: |
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263 | InEdgeIt() { } |
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264 | InEdgeIt(Invalid i) : Edge(i) { } |
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265 | InEdgeIt(const RevGraphWrapper<Graph>& _gw, const Node& n) : |
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266 | Edge(typename Graph::OutEdgeIt(*(_gw.graph), n)), gw(&_gw) { } |
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267 | InEdgeIt(const RevGraphWrapper<Graph>& _gw, const Edge& e) : |
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268 | Edge(e), gw(&_gw) { } |
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269 | InEdgeIt& operator++() { |
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270 | *(static_cast<Edge*>(this))= |
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271 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
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272 | return *this; |
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273 | } |
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274 | }; |
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275 | |
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276 | using GraphWrapper<Graph>::first; |
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277 | OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { |
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278 | i=OutEdgeIt(*this, p); return i; |
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279 | } |
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280 | InEdgeIt& first(InEdgeIt& i, const Node& p) const { |
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281 | i=InEdgeIt(*this, p); return i; |
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282 | } |
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283 | |
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284 | Node tail(const Edge& e) const { |
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285 | return GraphWrapper<Graph>::head(e); } |
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286 | Node head(const Edge& e) const { |
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287 | return GraphWrapper<Graph>::tail(e); } |
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288 | |
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289 | KEEP_MAPS(Parent, RevGraphWrapper); |
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290 | |
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291 | }; |
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292 | |
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293 | |
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294 | |
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295 | /// A graph wrapper for hiding nodes and edges from a graph. |
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296 | |
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297 | ///\warning Graph wrappers are in even more experimental state than the other |
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298 | ///parts of the lib. Use them at you own risk. |
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299 | /// |
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300 | /// This wrapper shows a graph with filtered node-set and |
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301 | /// edge-set. Given a bool-valued map on the node-set and one on |
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302 | /// the edge-set of the graphs, the iterators shows only the objects |
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303 | /// having true value. |
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304 | /// The quick brown fox iterators jump over |
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305 | /// the lazy dog nodes or edges if their values for are false in the |
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306 | /// corresponding bool maps. |
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307 | /// |
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308 | ///\author Marton Makai |
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309 | template<typename Graph, typename NodeFilterMap, |
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310 | typename EdgeFilterMap> |
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311 | class SubGraphWrapper : public GraphWrapper<Graph> { |
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312 | public: |
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313 | typedef GraphWrapper<Graph> Parent; |
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314 | protected: |
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315 | NodeFilterMap* node_filter_map; |
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316 | EdgeFilterMap* edge_filter_map; |
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317 | |
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318 | SubGraphWrapper() : GraphWrapper<Graph>(), |
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319 | node_filter_map(0), edge_filter_map(0) { } |
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320 | void setNodeFilterMap(NodeFilterMap& _node_filter_map) { |
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321 | node_filter_map=&_node_filter_map; |
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322 | } |
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323 | void setEdgeFilterMap(EdgeFilterMap& _edge_filter_map) { |
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324 | edge_filter_map=&_edge_filter_map; |
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325 | } |
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326 | |
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327 | public: |
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328 | SubGraphWrapper(Graph& _graph, NodeFilterMap& _node_filter_map, |
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329 | EdgeFilterMap& _edge_filter_map) : |
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330 | GraphWrapper<Graph>(_graph), node_filter_map(&_node_filter_map), |
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331 | edge_filter_map(&_edge_filter_map) { } |
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332 | |
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333 | typedef typename GraphWrapper<Graph>::Node Node; |
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334 | class NodeIt : public Node { |
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335 | const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>* gw; |
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336 | friend class SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>; |
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337 | public: |
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338 | NodeIt() { } |
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339 | NodeIt(Invalid i) : Node(i) { } |
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340 | NodeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _gw) : |
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341 | Node(typename Graph::NodeIt(*(_gw.graph))), gw(&_gw) { |
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342 | while (*static_cast<Node*>(this)!=INVALID && |
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343 | !(*(gw->node_filter_map))[*this]) |
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344 | *(static_cast<Node*>(this))= |
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345 | ++(typename Graph::NodeIt(*(gw->graph), *this)); |
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346 | } |
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347 | NodeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _gw, |
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348 | const Node& n) : |
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349 | Node(n), gw(&_gw) { } |
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350 | NodeIt& operator++() { |
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351 | *(static_cast<Node*>(this))= |
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352 | ++(typename Graph::NodeIt(*(gw->graph), *this)); |
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353 | while (*static_cast<Node*>(this)!=INVALID && |
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354 | !(*(gw->node_filter_map))[*this]) |
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355 | *(static_cast<Node*>(this))= |
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356 | ++(typename Graph::NodeIt(*(gw->graph), *this)); |
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357 | return *this; |
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358 | } |
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359 | }; |
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360 | typedef typename GraphWrapper<Graph>::Edge Edge; |
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361 | class OutEdgeIt : public Edge { |
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362 | const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>* gw; |
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363 | friend class SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>; |
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364 | public: |
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365 | OutEdgeIt() { } |
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366 | OutEdgeIt(Invalid i) : Edge(i) { } |
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367 | OutEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _gw, const Node& n) : |
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368 | Edge(typename Graph::OutEdgeIt(*(_gw.graph), n)), gw(&_gw) { |
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369 | while (*static_cast<Edge*>(this)!=INVALID && |
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370 | !(*(gw->edge_filter_map))[*this]) |
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371 | *(static_cast<Edge*>(this))= |
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372 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
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373 | } |
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374 | OutEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _gw, |
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375 | const Edge& e) : |
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376 | Edge(e), gw(&_gw) { } |
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377 | OutEdgeIt& operator++() { |
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378 | *(static_cast<Edge*>(this))= |
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379 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
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380 | while (*static_cast<Edge*>(this)!=INVALID && |
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381 | !(*(gw->edge_filter_map))[*this]) |
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382 | *(static_cast<Edge*>(this))= |
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383 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
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384 | return *this; |
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385 | } |
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386 | }; |
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387 | class InEdgeIt : public Edge { |
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388 | const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>* gw; |
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389 | friend class SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>; |
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390 | public: |
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391 | InEdgeIt() { } |
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392 | // InEdgeIt(const InEdgeIt& e) : Edge(e), gw(e.gw) { } |
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393 | InEdgeIt(Invalid i) : Edge(i) { } |
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394 | InEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _gw, const Node& n) : |
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395 | Edge(typename Graph::InEdgeIt(*(_gw.graph), n)), gw(&_gw) { |
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396 | while (*static_cast<Edge*>(this)!=INVALID && |
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397 | !(*(gw->edge_filter_map))[*this]) |
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398 | *(static_cast<Edge*>(this))= |
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399 | ++(typename Graph::InEdgeIt(*(gw->graph), *this)); |
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400 | } |
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401 | InEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _gw, |
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402 | const Edge& e) : |
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403 | Edge(e), gw(&_gw) { } |
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404 | InEdgeIt& operator++() { |
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405 | *(static_cast<Edge*>(this))= |
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406 | ++(typename Graph::InEdgeIt(*(gw->graph), *this)); |
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407 | while (*static_cast<Edge*>(this)!=INVALID && |
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408 | !(*(gw->edge_filter_map))[*this]) |
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409 | *(static_cast<Edge*>(this))= |
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410 | ++(typename Graph::InEdgeIt(*(gw->graph), *this)); |
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411 | return *this; |
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412 | } |
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413 | }; |
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414 | class EdgeIt : public Edge { |
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415 | const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>* gw; |
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416 | friend class SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>; |
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417 | public: |
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418 | EdgeIt() { } |
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419 | EdgeIt(Invalid i) : Edge(i) { } |
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420 | EdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _gw) : |
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421 | Edge(typename Graph::EdgeIt(*(_gw.graph))), gw(&_gw) { |
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422 | while (*static_cast<Edge*>(this)!=INVALID && |
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423 | !(*(gw->edge_filter_map))[*this]) |
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424 | *(static_cast<Edge*>(this))= |
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425 | ++(typename Graph::EdgeIt(*(gw->graph), *this)); |
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426 | } |
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427 | EdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _gw, |
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428 | const Edge& e) : |
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429 | Edge(e), gw(&_gw) { } |
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430 | EdgeIt& operator++() { |
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431 | *(static_cast<Edge*>(this))= |
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432 | ++(typename Graph::EdgeIt(*(gw->graph), *this)); |
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433 | while (*static_cast<Edge*>(this)!=INVALID && |
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434 | !(*(gw->edge_filter_map))[*this]) |
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435 | *(static_cast<Edge*>(this))= |
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436 | ++(typename Graph::EdgeIt(*(gw->graph), *this)); |
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437 | return *this; |
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438 | } |
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439 | }; |
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440 | |
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441 | NodeIt& first(NodeIt& i) const { |
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442 | i=NodeIt(*this); return i; |
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443 | } |
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444 | OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { |
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445 | i=OutEdgeIt(*this, p); return i; |
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446 | } |
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447 | InEdgeIt& first(InEdgeIt& i, const Node& p) const { |
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448 | i=InEdgeIt(*this, p); return i; |
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449 | } |
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450 | EdgeIt& first(EdgeIt& i) const { |
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451 | i=EdgeIt(*this); return i; |
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452 | } |
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453 | |
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454 | /// This function hides \c n in the graph, i.e. the iteration |
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455 | /// jumps over it. This is done by simply setting the value of \c n |
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456 | /// to be false in the corresponding node-map. |
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457 | void hide(const Node& n) const { node_filter_map->set(n, false); } |
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458 | |
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459 | /// This function hides \c e in the graph, i.e. the iteration |
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460 | /// jumps over it. This is done by simply setting the value of \c e |
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461 | /// to be false in the corresponding edge-map. |
---|
462 | void hide(const Edge& e) const { edge_filter_map->set(e, false); } |
---|
463 | |
---|
464 | /// The value of \c n is set to be true in the node-map which stores |
---|
465 | /// hide information. If \c n was hidden previuosly, then it is shown |
---|
466 | /// again |
---|
467 | void unHide(const Node& n) const { node_filter_map->set(n, true); } |
---|
468 | |
---|
469 | /// The value of \c e is set to be true in the edge-map which stores |
---|
470 | /// hide information. If \c e was hidden previuosly, then it is shown |
---|
471 | /// again |
---|
472 | void unHide(const Edge& e) const { edge_filter_map->set(e, true); } |
---|
473 | |
---|
474 | /// Returns true if \c n is hidden. |
---|
475 | bool hidden(const Node& n) const { return !(*node_filter_map)[n]; } |
---|
476 | |
---|
477 | /// Returns true if \c n is hidden. |
---|
478 | bool hidden(const Edge& e) const { return !(*edge_filter_map)[e]; } |
---|
479 | |
---|
480 | /// \warning This is a linear time operation and works only if |
---|
481 | /// \c Graph::NodeIt is defined. |
---|
482 | int nodeNum() const { |
---|
483 | int i=0; |
---|
484 | for (NodeIt n(*this); n!=INVALID; ++n) ++i; |
---|
485 | return i; |
---|
486 | } |
---|
487 | |
---|
488 | /// \warning This is a linear time operation and works only if |
---|
489 | /// \c Graph::EdgeIt is defined. |
---|
490 | int edgeNum() const { |
---|
491 | int i=0; |
---|
492 | for (EdgeIt e(*this); e!=INVALID; ++e) ++i; |
---|
493 | return i; |
---|
494 | } |
---|
495 | |
---|
496 | KEEP_MAPS(Parent, SubGraphWrapper); |
---|
497 | }; |
---|
498 | |
---|
499 | |
---|
500 | |
---|
501 | template<typename Graph> |
---|
502 | class UndirGraphWrapper : public GraphWrapper<Graph> { |
---|
503 | public: |
---|
504 | typedef GraphWrapper<Graph> Parent; |
---|
505 | protected: |
---|
506 | UndirGraphWrapper() : GraphWrapper<Graph>() { } |
---|
507 | |
---|
508 | public: |
---|
509 | typedef typename GraphWrapper<Graph>::Node Node; |
---|
510 | typedef typename GraphWrapper<Graph>::NodeIt NodeIt; |
---|
511 | typedef typename GraphWrapper<Graph>::Edge Edge; |
---|
512 | typedef typename GraphWrapper<Graph>::EdgeIt EdgeIt; |
---|
513 | |
---|
514 | UndirGraphWrapper(Graph& _graph) : GraphWrapper<Graph>(_graph) { } |
---|
515 | |
---|
516 | class OutEdgeIt { |
---|
517 | friend class UndirGraphWrapper<Graph>; |
---|
518 | bool out_or_in; //true iff out |
---|
519 | typename Graph::OutEdgeIt out; |
---|
520 | typename Graph::InEdgeIt in; |
---|
521 | public: |
---|
522 | OutEdgeIt() { } |
---|
523 | OutEdgeIt(const Invalid& i) : Edge(i) { } |
---|
524 | OutEdgeIt(const UndirGraphWrapper<Graph>& _G, const Node& _n) { |
---|
525 | out_or_in=true; _G.graph->first(out, _n); |
---|
526 | if (!(_G.graph->valid(out))) { out_or_in=false; _G.graph->first(in, _n); } |
---|
527 | } |
---|
528 | operator Edge() const { |
---|
529 | if (out_or_in) return Edge(out); else return Edge(in); |
---|
530 | } |
---|
531 | }; |
---|
532 | |
---|
533 | typedef OutEdgeIt InEdgeIt; |
---|
534 | |
---|
535 | using GraphWrapper<Graph>::first; |
---|
536 | OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { |
---|
537 | i=OutEdgeIt(*this, p); return i; |
---|
538 | } |
---|
539 | |
---|
540 | using GraphWrapper<Graph>::next; |
---|
541 | |
---|
542 | OutEdgeIt& next(OutEdgeIt& e) const { |
---|
543 | if (e.out_or_in) { |
---|
544 | typename Graph::Node n=this->graph->tail(e.out); |
---|
545 | this->graph->next(e.out); |
---|
546 | if (!this->graph->valid(e.out)) { |
---|
547 | e.out_or_in=false; this->graph->first(e.in, n); } |
---|
548 | } else { |
---|
549 | this->graph->next(e.in); |
---|
550 | } |
---|
551 | return e; |
---|
552 | } |
---|
553 | |
---|
554 | Node aNode(const OutEdgeIt& e) const { |
---|
555 | if (e.out_or_in) return this->graph->tail(e); else |
---|
556 | return this->graph->head(e); } |
---|
557 | Node bNode(const OutEdgeIt& e) const { |
---|
558 | if (e.out_or_in) return this->graph->head(e); else |
---|
559 | return this->graph->tail(e); } |
---|
560 | |
---|
561 | KEEP_MAPS(Parent, UndirGraphWrapper); |
---|
562 | |
---|
563 | }; |
---|
564 | |
---|
565 | /// \brief An undirected graph template. |
---|
566 | /// |
---|
567 | ///\warning Graph wrappers are in even more experimental state than the other |
---|
568 | ///parts of the lib. Use them at you own risk. |
---|
569 | /// |
---|
570 | /// An undirected graph template. |
---|
571 | /// This class works as an undirected graph and a directed graph of |
---|
572 | /// class \c Graph is used for the physical storage. |
---|
573 | /// \ingroup graphs |
---|
574 | template<typename Graph> |
---|
575 | class UndirGraph : public UndirGraphWrapper<Graph> { |
---|
576 | typedef UndirGraphWrapper<Graph> Parent; |
---|
577 | protected: |
---|
578 | Graph gr; |
---|
579 | public: |
---|
580 | UndirGraph() : UndirGraphWrapper<Graph>() { |
---|
581 | Parent::setGraph(gr); |
---|
582 | } |
---|
583 | |
---|
584 | KEEP_MAPS(Parent, UndirGraph); |
---|
585 | }; |
---|
586 | |
---|
587 | |
---|
588 | |
---|
589 | ///\brief A wrapper for composing a subgraph of a |
---|
590 | /// bidirected graph made from a directed one. |
---|
591 | /// |
---|
592 | ///\warning Graph wrappers are in even more experimental state than the other |
---|
593 | ///parts of the lib. Use them at you own risk. |
---|
594 | /// |
---|
595 | /// Suppose that for a directed graph $G=(V, A)$, |
---|
596 | /// two predicates on the edge-set, $forward_filter$, and $backward_filter$ |
---|
597 | /// is given, and we are dealing with the directed graph |
---|
598 | /// a $G'=(V, \{uv : uv\in A \mbox{ and } forward_filter(uv) \mbox{ is true}\}+\{vu : uv\in A \mbox{ and } backward_filter(uv) \mbox{ is true}\})$. |
---|
599 | /// The purpose of writing + instead of union is because parallel |
---|
600 | /// edges can arose. |
---|
601 | /// In other words, a subgraph of the bidirected graph obtained, which |
---|
602 | /// is given by orienting the edges of the original graph in both directions. |
---|
603 | /// An example for such a construction is the \c RevGraphWrapper where the |
---|
604 | /// forward_filter is everywhere false and the backward_filter is |
---|
605 | /// everywhere true. We note that for sake of efficiency, |
---|
606 | /// \c RevGraphWrapper is implemented in a different way. |
---|
607 | /// But BidirGraphWrapper is obtained from |
---|
608 | /// SubBidirGraphWrapper by considering everywhere true |
---|
609 | /// predicates both forward_filter and backward_filter. |
---|
610 | /// Finally, one of the most important applications of SubBidirGraphWrapper |
---|
611 | /// is ResGraphWrapper, which stands for the residual graph in directed |
---|
612 | /// flow and circulation problems. |
---|
613 | /// As wrappers usually, the SubBidirGraphWrapper implements the |
---|
614 | /// above mentioned graph structure without its physical storage, |
---|
615 | /// that is the whole stuff eats constant memory. |
---|
616 | /// As the oppositely directed edges are logical different, |
---|
617 | /// the maps are able to attach different values for them. |
---|
618 | template<typename Graph, |
---|
619 | typename ForwardFilterMap, typename BackwardFilterMap> |
---|
620 | class SubBidirGraphWrapper : public GraphWrapper<Graph> { |
---|
621 | public: |
---|
622 | typedef GraphWrapper<Graph> Parent; |
---|
623 | protected: |
---|
624 | ForwardFilterMap* forward_filter; |
---|
625 | BackwardFilterMap* backward_filter; |
---|
626 | |
---|
627 | SubBidirGraphWrapper() : GraphWrapper<Graph>() { } |
---|
628 | void setForwardFilterMap(ForwardFilterMap& _forward_filter) { |
---|
629 | forward_filter=&_forward_filter; |
---|
630 | } |
---|
631 | void setBackwardFilterMap(BackwardFilterMap& _backward_filter) { |
---|
632 | backward_filter=&_backward_filter; |
---|
633 | } |
---|
634 | |
---|
635 | public: |
---|
636 | |
---|
637 | SubBidirGraphWrapper(Graph& _graph, ForwardFilterMap& _forward_filter, |
---|
638 | BackwardFilterMap& _backward_filter) : |
---|
639 | GraphWrapper<Graph>(_graph), |
---|
640 | forward_filter(&_forward_filter), backward_filter(&_backward_filter) { } |
---|
641 | SubBidirGraphWrapper(const SubBidirGraphWrapper<Graph, |
---|
642 | ForwardFilterMap, BackwardFilterMap>& gw) : |
---|
643 | Parent(gw), |
---|
644 | forward_filter(gw.forward_filter), |
---|
645 | backward_filter(gw.backward_filter) { } |
---|
646 | |
---|
647 | class Edge; |
---|
648 | class OutEdgeIt; |
---|
649 | friend class Edge; |
---|
650 | friend class OutEdgeIt; |
---|
651 | |
---|
652 | template<typename T> class EdgeMap; |
---|
653 | |
---|
654 | typedef typename GraphWrapper<Graph>::Node Node; |
---|
655 | |
---|
656 | typedef typename Graph::Edge GraphEdge; |
---|
657 | /// SubBidirGraphWrapper<..., ..., ...>::Edge is inherited from |
---|
658 | /// Graph::Edge. It contains an extra bool flag which shows if the |
---|
659 | /// edge is the backward version of the original edge. |
---|
660 | class Edge : public Graph::Edge { |
---|
661 | friend class SubBidirGraphWrapper<Graph, |
---|
662 | ForwardFilterMap, BackwardFilterMap>; |
---|
663 | template<typename T> friend class EdgeMap; |
---|
664 | protected: |
---|
665 | bool backward; //true, iff backward |
---|
666 | public: |
---|
667 | Edge() { } |
---|
668 | /// \todo =false is needed, or causes problems? |
---|
669 | /// If \c _backward is false, then we get an edge corresponding to the |
---|
670 | /// original one, otherwise its oppositely directed pair is obtained. |
---|
671 | Edge(const typename Graph::Edge& e, bool _backward/*=false*/) : |
---|
672 | Graph::Edge(e), backward(_backward) { } |
---|
673 | Edge(Invalid i) : Graph::Edge(i), backward(true) { } |
---|
674 | bool operator==(const Edge& v) const { |
---|
675 | return (this->backward==v.backward && |
---|
676 | static_cast<typename Graph::Edge>(*this)== |
---|
677 | static_cast<typename Graph::Edge>(v)); |
---|
678 | } |
---|
679 | bool operator!=(const Edge& v) const { |
---|
680 | return (this->backward!=v.backward || |
---|
681 | static_cast<typename Graph::Edge>(*this)!= |
---|
682 | static_cast<typename Graph::Edge>(v)); |
---|
683 | } |
---|
684 | }; |
---|
685 | |
---|
686 | class OutEdgeIt : public Edge { |
---|
687 | friend class SubBidirGraphWrapper<Graph, |
---|
688 | ForwardFilterMap, BackwardFilterMap>; |
---|
689 | protected: |
---|
690 | const SubBidirGraphWrapper<Graph, |
---|
691 | ForwardFilterMap, BackwardFilterMap>* gw; |
---|
692 | public: |
---|
693 | OutEdgeIt() { } |
---|
694 | OutEdgeIt(Invalid i) : Edge(i) { } |
---|
695 | OutEdgeIt(const SubBidirGraphWrapper<Graph, |
---|
696 | ForwardFilterMap, BackwardFilterMap>& _gw, const Node& n) : |
---|
697 | Edge(typename Graph::OutEdgeIt(*(_gw.graph), n), false), gw(&_gw) { |
---|
698 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
699 | !(*(gw->forward_filter))[*this]) |
---|
700 | *(static_cast<GraphEdge*>(this))= |
---|
701 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
---|
702 | if (*static_cast<GraphEdge*>(this)==INVALID) { |
---|
703 | *static_cast<Edge*>(this)= |
---|
704 | Edge(typename Graph::InEdgeIt(*(_gw.graph), n), true); |
---|
705 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
706 | !(*(gw->backward_filter))[*this]) |
---|
707 | *(static_cast<GraphEdge*>(this))= |
---|
708 | ++(typename Graph::InEdgeIt(*(gw->graph), *this)); |
---|
709 | } |
---|
710 | } |
---|
711 | OutEdgeIt(const SubBidirGraphWrapper<Graph, |
---|
712 | ForwardFilterMap, BackwardFilterMap>& _gw, const Edge& e) : |
---|
713 | Edge(e), gw(&_gw) { } |
---|
714 | OutEdgeIt& operator++() { |
---|
715 | if (!this->backward) { |
---|
716 | Node n=gw->tail(*this); |
---|
717 | *(static_cast<GraphEdge*>(this))= |
---|
718 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
---|
719 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
720 | !(*(gw->forward_filter))[*this]) |
---|
721 | *(static_cast<GraphEdge*>(this))= |
---|
722 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
---|
723 | if (*static_cast<GraphEdge*>(this)==INVALID) { |
---|
724 | *static_cast<Edge*>(this)= |
---|
725 | Edge(typename Graph::InEdgeIt(*(gw->graph), n), true); |
---|
726 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
727 | !(*(gw->backward_filter))[*this]) |
---|
728 | *(static_cast<GraphEdge*>(this))= |
---|
729 | ++(typename Graph::InEdgeIt(*(gw->graph), *this)); |
---|
730 | } |
---|
731 | } else { |
---|
732 | *(static_cast<GraphEdge*>(this))= |
---|
733 | ++(typename Graph::InEdgeIt(*(gw->graph), *this)); |
---|
734 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
735 | !(*(gw->backward_filter))[*this]) |
---|
736 | *(static_cast<GraphEdge*>(this))= |
---|
737 | ++(typename Graph::InEdgeIt(*(gw->graph), *this)); |
---|
738 | } |
---|
739 | return *this; |
---|
740 | } |
---|
741 | }; |
---|
742 | |
---|
743 | class InEdgeIt : public Edge { |
---|
744 | friend class SubBidirGraphWrapper<Graph, |
---|
745 | ForwardFilterMap, BackwardFilterMap>; |
---|
746 | protected: |
---|
747 | const SubBidirGraphWrapper<Graph, |
---|
748 | ForwardFilterMap, BackwardFilterMap>* gw; |
---|
749 | public: |
---|
750 | InEdgeIt() { } |
---|
751 | InEdgeIt(Invalid i) : Edge(i) { } |
---|
752 | InEdgeIt(const SubBidirGraphWrapper<Graph, |
---|
753 | ForwardFilterMap, BackwardFilterMap>& _gw, const Node& n) : |
---|
754 | Edge(typename Graph::InEdgeIt(*(_gw.graph), n), false), gw(&_gw) { |
---|
755 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
756 | !(*(gw->forward_filter))[*this]) |
---|
757 | *(static_cast<GraphEdge*>(this))= |
---|
758 | ++(typename Graph::InEdgeIt(*(gw->graph), *this)); |
---|
759 | if (*static_cast<GraphEdge*>(this)==INVALID) { |
---|
760 | *static_cast<Edge*>(this)= |
---|
761 | Edge(typename Graph::OutEdgeIt(*(_gw.graph), n), true); |
---|
762 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
763 | !(*(gw->backward_filter))[*this]) |
---|
764 | *(static_cast<GraphEdge*>(this))= |
---|
765 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
---|
766 | } |
---|
767 | } |
---|
768 | InEdgeIt(const SubBidirGraphWrapper<Graph, |
---|
769 | ForwardFilterMap, BackwardFilterMap>& _gw, const Edge& e) : |
---|
770 | Edge(e), gw(&_gw) { } |
---|
771 | InEdgeIt& operator++() { |
---|
772 | if (!this->backward) { |
---|
773 | Node n=gw->tail(*this); |
---|
774 | *(static_cast<GraphEdge*>(this))= |
---|
775 | ++(typename Graph::InEdgeIt(*(gw->graph), *this)); |
---|
776 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
777 | !(*(gw->forward_filter))[*this]) |
---|
778 | *(static_cast<GraphEdge*>(this))= |
---|
779 | ++(typename Graph::InEdgeIt(*(gw->graph), *this)); |
---|
780 | if (*static_cast<GraphEdge*>(this)==INVALID) { |
---|
781 | *static_cast<Edge*>(this)= |
---|
782 | Edge(typename Graph::OutEdgeIt(*(gw->graph), n), true); |
---|
783 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
784 | !(*(gw->backward_filter))[*this]) |
---|
785 | *(static_cast<GraphEdge*>(this))= |
---|
786 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
---|
787 | } |
---|
788 | } else { |
---|
789 | *(static_cast<GraphEdge*>(this))= |
---|
790 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
---|
791 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
792 | !(*(gw->backward_filter))[*this]) |
---|
793 | *(static_cast<GraphEdge*>(this))= |
---|
794 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
---|
795 | } |
---|
796 | return *this; |
---|
797 | } |
---|
798 | }; |
---|
799 | |
---|
800 | class EdgeIt : public Edge { |
---|
801 | friend class SubBidirGraphWrapper<Graph, |
---|
802 | ForwardFilterMap, BackwardFilterMap>; |
---|
803 | protected: |
---|
804 | const SubBidirGraphWrapper<Graph, |
---|
805 | ForwardFilterMap, BackwardFilterMap>* gw; |
---|
806 | public: |
---|
807 | EdgeIt() { } |
---|
808 | EdgeIt(Invalid i) : Edge(i) { } |
---|
809 | EdgeIt(const SubBidirGraphWrapper<Graph, |
---|
810 | ForwardFilterMap, BackwardFilterMap>& _gw) : |
---|
811 | Edge(typename Graph::OutEdgeIt(*(_gw.graph)), false), gw(&_gw) { |
---|
812 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
813 | !(*(gw->forward_filter))[*this]) |
---|
814 | *(static_cast<GraphEdge*>(this))= |
---|
815 | ++(typename Graph::EdgeIt(*(gw->graph), *this)); |
---|
816 | if (*static_cast<GraphEdge*>(this)==INVALID) { |
---|
817 | *static_cast<Edge*>(this)= |
---|
818 | Edge(typename Graph::EdgeIt(*(_gw.graph)), true); |
---|
819 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
820 | !(*(gw->backward_filter))[*this]) |
---|
821 | *(static_cast<GraphEdge*>(this))= |
---|
822 | ++(typename Graph::EdgeIt(*(gw->graph), *this)); |
---|
823 | } |
---|
824 | } |
---|
825 | EdgeIt(const SubBidirGraphWrapper<Graph, |
---|
826 | ForwardFilterMap, BackwardFilterMap>& _gw, const Edge& e) : |
---|
827 | Edge(e), gw(&_gw) { } |
---|
828 | EdgeIt& operator++() { |
---|
829 | if (!this->backward) { |
---|
830 | *(static_cast<GraphEdge*>(this))= |
---|
831 | ++(typename Graph::EdgeIt(*(gw->graph), *this)); |
---|
832 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
833 | !(*(gw->forward_filter))[*this]) |
---|
834 | *(static_cast<GraphEdge*>(this))= |
---|
835 | ++(typename Graph::EdgeIt(*(gw->graph), *this)); |
---|
836 | if (*static_cast<GraphEdge*>(this)==INVALID) { |
---|
837 | *static_cast<Edge*>(this)= |
---|
838 | Edge(typename Graph::EdgeIt(*(gw->graph)), true); |
---|
839 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
840 | !(*(gw->backward_filter))[*this]) |
---|
841 | *(static_cast<GraphEdge*>(this))= |
---|
842 | ++(typename Graph::EdgeIt(*(gw->graph), *this)); |
---|
843 | } |
---|
844 | } else { |
---|
845 | *(static_cast<GraphEdge*>(this))= |
---|
846 | ++(typename Graph::EdgeIt(*(gw->graph), *this)); |
---|
847 | while (*static_cast<GraphEdge*>(this)!=INVALID && |
---|
848 | !(*(gw->backward_filter))[*this]) |
---|
849 | *(static_cast<GraphEdge*>(this))= |
---|
850 | ++(typename Graph::EdgeIt(*(gw->graph), *this)); |
---|
851 | } |
---|
852 | return *this; |
---|
853 | } |
---|
854 | }; |
---|
855 | |
---|
856 | using GraphWrapper<Graph>::first; |
---|
857 | OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { |
---|
858 | i=OutEdgeIt(*this, p); return i; |
---|
859 | } |
---|
860 | InEdgeIt& first(InEdgeIt& i, const Node& p) const { |
---|
861 | i=InEdgeIt(*this, p); return i; |
---|
862 | } |
---|
863 | EdgeIt& first(EdgeIt& i) const { |
---|
864 | i=EdgeIt(*this); return i; |
---|
865 | } |
---|
866 | |
---|
867 | |
---|
868 | Node tail(Edge e) const { |
---|
869 | return ((!e.backward) ? this->graph->tail(e) : this->graph->head(e)); } |
---|
870 | Node head(Edge e) const { |
---|
871 | return ((!e.backward) ? this->graph->head(e) : this->graph->tail(e)); } |
---|
872 | |
---|
873 | /// Gives back the opposite edge. |
---|
874 | Edge opposite(const Edge& e) const { |
---|
875 | Edge f=e; |
---|
876 | f.backward=!f.backward; |
---|
877 | return f; |
---|
878 | } |
---|
879 | |
---|
880 | /// \warning This is a linear time operation and works only if |
---|
881 | /// \c Graph::EdgeIt is defined. |
---|
882 | int edgeNum() const { |
---|
883 | int i=0; |
---|
884 | for (EdgeIt e(*this); e!=INVALID; ++e) ++i; |
---|
885 | return i; |
---|
886 | } |
---|
887 | |
---|
888 | bool forward(const Edge& e) const { return !e.backward; } |
---|
889 | bool backward(const Edge& e) const { return e.backward; } |
---|
890 | |
---|
891 | |
---|
892 | template <typename T> |
---|
893 | /// \c SubBidirGraphWrapper<..., ..., ...>::EdgeMap contains two |
---|
894 | /// Graph::EdgeMap one for the forward edges and |
---|
895 | /// one for the backward edges. |
---|
896 | class EdgeMap { |
---|
897 | typename Graph::template EdgeMap<T> forward_map, backward_map; |
---|
898 | public: |
---|
899 | typedef T ValueType; |
---|
900 | typedef Edge KeyType; |
---|
901 | EdgeMap(const SubBidirGraphWrapper<Graph, |
---|
902 | ForwardFilterMap, BackwardFilterMap>& g) : |
---|
903 | forward_map(*(g.graph)), backward_map(*(g.graph)) { } |
---|
904 | EdgeMap(const SubBidirGraphWrapper<Graph, |
---|
905 | ForwardFilterMap, BackwardFilterMap>& g, T a) : |
---|
906 | forward_map(*(g.graph), a), backward_map(*(g.graph), a) { } |
---|
907 | void set(Edge e, T a) { |
---|
908 | if (!e.backward) |
---|
909 | forward_map.set(e, a); |
---|
910 | else |
---|
911 | backward_map.set(e, a); |
---|
912 | } |
---|
913 | T operator[](Edge e) const { |
---|
914 | if (!e.backward) |
---|
915 | return forward_map[e]; |
---|
916 | else |
---|
917 | return backward_map[e]; |
---|
918 | } |
---|
919 | void update() { |
---|
920 | forward_map.update(); |
---|
921 | backward_map.update(); |
---|
922 | } |
---|
923 | }; |
---|
924 | |
---|
925 | |
---|
926 | KEEP_NODE_MAP(Parent, SubBidirGraphWrapper); |
---|
927 | |
---|
928 | }; |
---|
929 | |
---|
930 | |
---|
931 | ///\brief A wrapper for composing bidirected graph from a directed one. |
---|
932 | /// |
---|
933 | ///\warning Graph wrappers are in even more experimental state than the other |
---|
934 | ///parts of the lib. Use them at you own risk. |
---|
935 | /// |
---|
936 | /// A wrapper for composing bidirected graph from a directed one. |
---|
937 | /// A bidirected graph is composed over the directed one without physical |
---|
938 | /// storage. As the oppositely directed edges are logically different ones |
---|
939 | /// the maps are able to attach different values for them. |
---|
940 | template<typename Graph> |
---|
941 | class BidirGraphWrapper : |
---|
942 | public SubBidirGraphWrapper< |
---|
943 | Graph, |
---|
944 | ConstMap<typename Graph::Edge, bool>, |
---|
945 | ConstMap<typename Graph::Edge, bool> > { |
---|
946 | public: |
---|
947 | typedef SubBidirGraphWrapper< |
---|
948 | Graph, |
---|
949 | ConstMap<typename Graph::Edge, bool>, |
---|
950 | ConstMap<typename Graph::Edge, bool> > Parent; |
---|
951 | protected: |
---|
952 | ConstMap<typename Graph::Edge, bool> cm; |
---|
953 | |
---|
954 | BidirGraphWrapper() : Parent(), cm(true) { |
---|
955 | Parent::setForwardFilterMap(cm); |
---|
956 | Parent::setBackwardFilterMap(cm); |
---|
957 | } |
---|
958 | public: |
---|
959 | BidirGraphWrapper(Graph& _graph) : Parent() { |
---|
960 | Parent::setGraph(_graph); |
---|
961 | Parent::setForwardFilterMap(cm); |
---|
962 | Parent::setBackwardFilterMap(cm); |
---|
963 | } |
---|
964 | |
---|
965 | int edgeNum() const { |
---|
966 | return 2*this->graph->edgeNum(); |
---|
967 | } |
---|
968 | KEEP_MAPS(Parent, BidirGraphWrapper); |
---|
969 | }; |
---|
970 | |
---|
971 | |
---|
972 | /// \brief A bidirected graph template. |
---|
973 | /// |
---|
974 | ///\warning Graph wrappers are in even more experimental state than the other |
---|
975 | ///parts of the lib. Use them at you own risk. |
---|
976 | /// |
---|
977 | /// A bidirected graph template. |
---|
978 | /// Such a bidirected graph stores each pair of oppositely directed edges |
---|
979 | /// ones in the memory, i.e. a directed graph of type |
---|
980 | /// \c Graph is used for that. |
---|
981 | /// As the oppositely directed edges are logically different ones |
---|
982 | /// the maps are able to attach different values for them. |
---|
983 | /// \ingroup graphs |
---|
984 | template<typename Graph> |
---|
985 | class BidirGraph : public BidirGraphWrapper<Graph> { |
---|
986 | public: |
---|
987 | typedef UndirGraphWrapper<Graph> Parent; |
---|
988 | protected: |
---|
989 | Graph gr; |
---|
990 | public: |
---|
991 | BidirGraph() : BidirGraphWrapper<Graph>() { |
---|
992 | Parent::setGraph(gr); |
---|
993 | } |
---|
994 | KEEP_MAPS(Parent, BidirGraph); |
---|
995 | }; |
---|
996 | |
---|
997 | |
---|
998 | |
---|
999 | template<typename Graph, typename Number, |
---|
1000 | typename CapacityMap, typename FlowMap> |
---|
1001 | class ResForwardFilter { |
---|
1002 | // const Graph* graph; |
---|
1003 | const CapacityMap* capacity; |
---|
1004 | const FlowMap* flow; |
---|
1005 | public: |
---|
1006 | ResForwardFilter(/*const Graph& _graph, */ |
---|
1007 | const CapacityMap& _capacity, const FlowMap& _flow) : |
---|
1008 | /*graph(&_graph),*/ capacity(&_capacity), flow(&_flow) { } |
---|
1009 | ResForwardFilter() : /*graph(0),*/ capacity(0), flow(0) { } |
---|
1010 | void setCapacity(const CapacityMap& _capacity) { capacity=&_capacity; } |
---|
1011 | void setFlow(const FlowMap& _flow) { flow=&_flow; } |
---|
1012 | bool operator[](const typename Graph::Edge& e) const { |
---|
1013 | return (Number((*flow)[e]) < Number((*capacity)[e])); |
---|
1014 | } |
---|
1015 | }; |
---|
1016 | |
---|
1017 | template<typename Graph, typename Number, |
---|
1018 | typename CapacityMap, typename FlowMap> |
---|
1019 | class ResBackwardFilter { |
---|
1020 | const CapacityMap* capacity; |
---|
1021 | const FlowMap* flow; |
---|
1022 | public: |
---|
1023 | ResBackwardFilter(/*const Graph& _graph,*/ |
---|
1024 | const CapacityMap& _capacity, const FlowMap& _flow) : |
---|
1025 | /*graph(&_graph),*/ capacity(&_capacity), flow(&_flow) { } |
---|
1026 | ResBackwardFilter() : /*graph(0),*/ capacity(0), flow(0) { } |
---|
1027 | void setCapacity(const CapacityMap& _capacity) { capacity=&_capacity; } |
---|
1028 | void setFlow(const FlowMap& _flow) { flow=&_flow; } |
---|
1029 | bool operator[](const typename Graph::Edge& e) const { |
---|
1030 | return (Number(0) < Number((*flow)[e])); |
---|
1031 | } |
---|
1032 | }; |
---|
1033 | |
---|
1034 | |
---|
1035 | /// A wrapper for composing the residual graph for directed flow and circulation problems. |
---|
1036 | |
---|
1037 | ///\warning Graph wrappers are in even more experimental state than the other |
---|
1038 | ///parts of the lib. Use them at you own risk. |
---|
1039 | /// |
---|
1040 | /// A wrapper for composing the residual graph for directed flow and circulation problems. |
---|
1041 | template<typename Graph, typename Number, |
---|
1042 | typename CapacityMap, typename FlowMap> |
---|
1043 | class ResGraphWrapper : |
---|
1044 | public SubBidirGraphWrapper< |
---|
1045 | Graph, |
---|
1046 | ResForwardFilter<Graph, Number, CapacityMap, FlowMap>, |
---|
1047 | ResBackwardFilter<Graph, Number, CapacityMap, FlowMap> > { |
---|
1048 | public: |
---|
1049 | typedef SubBidirGraphWrapper< |
---|
1050 | Graph, |
---|
1051 | ResForwardFilter<Graph, Number, CapacityMap, FlowMap>, |
---|
1052 | ResBackwardFilter<Graph, Number, CapacityMap, FlowMap> > Parent; |
---|
1053 | protected: |
---|
1054 | const CapacityMap* capacity; |
---|
1055 | FlowMap* flow; |
---|
1056 | ResForwardFilter<Graph, Number, CapacityMap, FlowMap> forward_filter; |
---|
1057 | ResBackwardFilter<Graph, Number, CapacityMap, FlowMap> backward_filter; |
---|
1058 | ResGraphWrapper() : Parent(), |
---|
1059 | capacity(0), flow(0) { } |
---|
1060 | void setCapacityMap(const CapacityMap& _capacity) { |
---|
1061 | capacity=&_capacity; |
---|
1062 | forward_filter.setCapacity(_capacity); |
---|
1063 | backward_filter.setCapacity(_capacity); |
---|
1064 | } |
---|
1065 | void setFlowMap(FlowMap& _flow) { |
---|
1066 | flow=&_flow; |
---|
1067 | forward_filter.setFlow(_flow); |
---|
1068 | backward_filter.setFlow(_flow); |
---|
1069 | } |
---|
1070 | public: |
---|
1071 | ResGraphWrapper(Graph& _graph, const CapacityMap& _capacity, |
---|
1072 | FlowMap& _flow) : |
---|
1073 | Parent(), capacity(&_capacity), flow(&_flow), |
---|
1074 | forward_filter(/*_graph,*/ _capacity, _flow), |
---|
1075 | backward_filter(/*_graph,*/ _capacity, _flow) { |
---|
1076 | Parent::setGraph(_graph); |
---|
1077 | Parent::setForwardFilterMap(forward_filter); |
---|
1078 | Parent::setBackwardFilterMap(backward_filter); |
---|
1079 | } |
---|
1080 | |
---|
1081 | typedef typename Parent::Edge Edge; |
---|
1082 | |
---|
1083 | void augment(const Edge& e, Number a) const { |
---|
1084 | if (Parent::forward(e)) |
---|
1085 | flow->set(e, (*flow)[e]+a); |
---|
1086 | else |
---|
1087 | flow->set(e, (*flow)[e]-a); |
---|
1088 | } |
---|
1089 | |
---|
1090 | /// \brief Residual capacity map. |
---|
1091 | /// |
---|
1092 | /// In generic residual graphs the residual capacity can be obtained as a map. Not tested. |
---|
1093 | class ResCap { |
---|
1094 | protected: |
---|
1095 | const ResGraphWrapper<Graph, Number, CapacityMap, FlowMap>* res_graph; |
---|
1096 | public: |
---|
1097 | typedef Number ValueType; |
---|
1098 | typedef Edge KeyType; |
---|
1099 | ResCap(const ResGraphWrapper<Graph, Number, CapacityMap, FlowMap>& |
---|
1100 | _res_graph) : res_graph(&_res_graph) { } |
---|
1101 | Number operator[](const Edge& e) const { |
---|
1102 | if (res_graph->forward(e)) |
---|
1103 | return (*(res_graph->capacity))[e]-(*(res_graph->flow))[e]; |
---|
1104 | else |
---|
1105 | return (*(res_graph->flow))[e]; |
---|
1106 | } |
---|
1107 | }; |
---|
1108 | |
---|
1109 | KEEP_MAPS(Parent, ResGraphWrapper); |
---|
1110 | }; |
---|
1111 | |
---|
1112 | |
---|
1113 | /// For blocking flows. |
---|
1114 | |
---|
1115 | ///\warning Graph wrappers are in even more experimental state than the other |
---|
1116 | ///parts of the lib. Use them at you own risk. |
---|
1117 | /// |
---|
1118 | /// This graph wrapper is used for on-the-fly |
---|
1119 | /// Dinits blocking flow computations. |
---|
1120 | /// For each node, an out-edge is stored which is used when the |
---|
1121 | /// \code |
---|
1122 | /// OutEdgeIt& first(OutEdgeIt&, const Node&) |
---|
1123 | /// \endcode |
---|
1124 | /// is called. |
---|
1125 | /// |
---|
1126 | /// \author Marton Makai |
---|
1127 | template<typename Graph, typename FirstOutEdgesMap> |
---|
1128 | class ErasingFirstGraphWrapper : public GraphWrapper<Graph> { |
---|
1129 | public: |
---|
1130 | typedef GraphWrapper<Graph> Parent; |
---|
1131 | protected: |
---|
1132 | FirstOutEdgesMap* first_out_edges; |
---|
1133 | public: |
---|
1134 | ErasingFirstGraphWrapper(Graph& _graph, |
---|
1135 | FirstOutEdgesMap& _first_out_edges) : |
---|
1136 | GraphWrapper<Graph>(_graph), first_out_edges(&_first_out_edges) { } |
---|
1137 | |
---|
1138 | typedef typename GraphWrapper<Graph>::Node Node; |
---|
1139 | typedef typename GraphWrapper<Graph>::Edge Edge; |
---|
1140 | class OutEdgeIt : public Edge { |
---|
1141 | friend class GraphWrapper<Graph>; |
---|
1142 | friend class ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>; |
---|
1143 | const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>* gw; |
---|
1144 | public: |
---|
1145 | OutEdgeIt() { } |
---|
1146 | OutEdgeIt(Invalid i) : Edge(i) { } |
---|
1147 | OutEdgeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _gw, |
---|
1148 | const Node& n) : |
---|
1149 | Edge((*(_gw.first_out_edges))[n]), gw(&_gw) { } |
---|
1150 | OutEdgeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _gw, |
---|
1151 | const Edge& e) : |
---|
1152 | Edge(e), gw(&_gw) { } |
---|
1153 | OutEdgeIt& operator++() { |
---|
1154 | *(static_cast<Edge*>(this))= |
---|
1155 | ++(typename Graph::OutEdgeIt(*(gw->graph), *this)); |
---|
1156 | return *this; |
---|
1157 | } |
---|
1158 | }; |
---|
1159 | |
---|
1160 | using GraphWrapper<Graph>::first; |
---|
1161 | OutEdgeIt& first(OutEdgeIt& i, const Node& p) const { |
---|
1162 | i=OutEdgeIt(*this, p); return i; |
---|
1163 | } |
---|
1164 | void erase(const Edge& e) const { |
---|
1165 | Node n=tail(e); |
---|
1166 | typename Graph::OutEdgeIt f(*Parent::graph, n); |
---|
1167 | ++f; |
---|
1168 | first_out_edges->set(n, f); |
---|
1169 | } |
---|
1170 | |
---|
1171 | KEEP_MAPS(Parent, ErasingFirstGraphWrapper); |
---|
1172 | }; |
---|
1173 | |
---|
1174 | ///@} |
---|
1175 | |
---|
1176 | } //namespace hugo |
---|
1177 | |
---|
1178 | #endif //HUGO_GRAPH_WRAPPER_H |
---|
1179 | |
---|