1 | // -*- c++ -*- |
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2 | #ifndef LEMON_ITERABLE_GRAPH_EXTENDER_H |
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3 | #define LEMON_ITERABLE_GRAPH_EXTENDER_H |
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4 | |
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5 | #include <lemon/invalid.h> |
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6 | |
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7 | namespace lemon { |
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8 | |
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9 | template <typename _Base> |
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10 | class IterableGraphExtender : public _Base { |
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11 | public: |
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12 | |
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13 | typedef _Base Parent; |
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14 | typedef IterableGraphExtender<_Base> Graph; |
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15 | |
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16 | typedef typename Parent::Node Node; |
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17 | typedef typename Parent::Edge Edge; |
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18 | |
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19 | |
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20 | class NodeIt : public Node { |
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21 | const Graph* graph; |
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22 | public: |
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23 | |
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24 | NodeIt() {} |
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25 | |
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26 | NodeIt(Invalid i) : Node(i) { } |
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27 | |
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28 | explicit NodeIt(const Graph& _graph) : graph(&_graph) { |
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29 | _graph.first(*static_cast<Node*>(this)); |
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30 | } |
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31 | |
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32 | NodeIt(const Graph& _graph, const Node& node) |
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33 | : Node(node), graph(&_graph) {} |
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34 | |
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35 | NodeIt& operator++() { |
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36 | graph->next(*this); |
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37 | return *this; |
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38 | } |
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39 | |
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40 | }; |
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41 | |
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42 | |
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43 | class EdgeIt : public Edge { |
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44 | const Graph* graph; |
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45 | public: |
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46 | |
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47 | EdgeIt() { } |
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48 | |
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49 | EdgeIt(Invalid i) : Edge(i) { } |
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50 | |
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51 | explicit EdgeIt(const Graph& _graph) : graph(&_graph) { |
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52 | _graph.first(*static_cast<Edge*>(this)); |
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53 | } |
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54 | |
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55 | EdgeIt(const Graph& _graph, const Edge& e) : |
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56 | Edge(e), graph(&_graph) { } |
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57 | |
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58 | EdgeIt& operator++() { |
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59 | graph->next(*this); |
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60 | return *this; |
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61 | } |
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62 | |
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63 | }; |
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64 | |
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65 | |
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66 | class OutEdgeIt : public Edge { |
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67 | const Graph* graph; |
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68 | public: |
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69 | |
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70 | OutEdgeIt() { } |
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71 | |
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72 | OutEdgeIt(Invalid i) : Edge(i) { } |
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73 | |
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74 | OutEdgeIt(const Graph& _graph, const Node& node) |
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75 | : graph(&_graph) { |
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76 | _graph.firstOut(*this, node); |
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77 | } |
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78 | |
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79 | OutEdgeIt(const Graph& _graph, const Edge& edge) |
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80 | : Edge(edge), graph(&_graph) {} |
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81 | |
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82 | OutEdgeIt& operator++() { |
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83 | graph->nextOut(*this); |
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84 | return *this; |
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85 | } |
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86 | |
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87 | }; |
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88 | |
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89 | |
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90 | class InEdgeIt : public Edge { |
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91 | const Graph* graph; |
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92 | public: |
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93 | |
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94 | InEdgeIt() { } |
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95 | |
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96 | InEdgeIt(Invalid i) : Edge(i) { } |
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97 | |
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98 | InEdgeIt(const Graph& _graph, const Node& node) |
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99 | : graph(&_graph) { |
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100 | _graph.firstIn(*this, node); |
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101 | } |
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102 | |
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103 | InEdgeIt(const Graph& _graph, const Edge& edge) : |
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104 | Edge(edge), graph(&_graph) {} |
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105 | |
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106 | InEdgeIt& operator++() { |
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107 | graph->nextIn(*this); |
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108 | return *this; |
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109 | } |
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110 | |
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111 | }; |
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112 | |
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113 | using Parent::first; |
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114 | |
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115 | private: |
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116 | |
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117 | /// \todo When (and if) we change the iterators concept to use operator*, |
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118 | /// then the following shadowed methods will become superfluous. |
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119 | /// But for now these are important safety measures. |
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120 | |
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121 | void first(NodeIt &) const; |
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122 | void first(EdgeIt &) const; |
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123 | void first(OutEdgeIt &) const; |
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124 | void first(InEdgeIt &) const; |
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125 | |
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126 | }; |
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127 | |
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128 | template <typename _Base> |
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129 | class IterableUndirGraphExtender : public IterableGraphExtender<_Base> { |
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130 | public: |
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131 | |
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132 | typedef IterableGraphExtender<_Base> Parent; |
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133 | typedef IterableUndirGraphExtender<_Base> Graph; |
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134 | typedef typename Parent::Node Node; |
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135 | |
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136 | typedef typename Parent::UndirEdge UndirEdge; |
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137 | |
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138 | class UndirEdgeIt : public UndirEdge { |
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139 | const Graph* graph; |
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140 | public: |
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141 | |
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142 | UndirEdgeIt() { } |
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143 | |
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144 | UndirEdgeIt(Invalid i) : UndirEdge(i) { } |
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145 | |
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146 | explicit UndirEdgeIt(const Graph& _graph) : graph(&_graph) { |
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147 | _graph.first(*static_cast<UndirEdge*>(this)); |
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148 | } |
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149 | |
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150 | UndirEdgeIt(const Graph& _graph, const UndirEdge& e) : |
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151 | UndirEdge(e), graph(&_graph) { } |
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152 | |
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153 | UndirEdgeIt& operator++() { |
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154 | graph->next(*this); |
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155 | return *this; |
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156 | } |
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157 | |
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158 | }; |
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159 | |
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160 | class IncEdgeIt : public UndirEdge { |
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161 | const Graph* graph; |
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162 | bool forward; |
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163 | friend class IterableUndirGraphExtender; |
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164 | template <typename G> |
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165 | friend class UndirGraphExtender; |
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166 | public: |
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167 | |
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168 | IncEdgeIt() { } |
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169 | |
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170 | IncEdgeIt(Invalid i) : UndirEdge(i), forward(false) { } |
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171 | |
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172 | explicit IncEdgeIt(const Graph& _graph, const Node &n) |
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173 | : graph(&_graph) |
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174 | { |
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175 | _graph._dirFirstOut(*this, n); |
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176 | } |
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177 | |
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178 | // FIXME: Do we need this type of constructor here? |
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179 | // IncEdgeIt(const Graph& _graph, const Edge& e) : |
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180 | // UndirEdge(e), graph(&_graph), forward(_graph.forward(e)) { } |
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181 | // or |
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182 | // IncEdgeIt(const Graph& _graph, const Node& n, |
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183 | // Const UndirEdge &e) ... ? |
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184 | |
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185 | IncEdgeIt& operator++() { |
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186 | graph->_dirNextOut(*this); |
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187 | return *this; |
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188 | } |
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189 | }; |
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190 | |
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191 | Node source(const IncEdgeIt &e) const { |
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192 | return _dirSource(e); |
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193 | } |
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194 | |
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195 | /// \todo Shouldn't the "source" of an undirected edge be called "aNode" |
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196 | /// or something??? |
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197 | using Parent::source; |
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198 | |
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199 | /// Target of the given Edge. |
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200 | Node target(const IncEdgeIt &e) const { |
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201 | return _dirTarget(e); |
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202 | } |
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203 | |
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204 | /// \todo Shouldn't the "target" of an undirected edge be called "bNode" |
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205 | /// or something??? |
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206 | using Parent::target; |
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207 | |
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208 | }; |
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209 | } |
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210 | |
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211 | #endif // LEMON_GRAPH_EXTENDER_H |
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