[946] | 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 | |
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| 12 | typedef _Base Parent; |
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| 13 | typedef IterableGraphExtender<_Base> Graph; |
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| 14 | |
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| 15 | public: |
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| 16 | |
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| 17 | typedef typename Parent::Node Node; |
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| 18 | typedef typename Parent::Edge Edge; |
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| 19 | |
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| 20 | |
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| 21 | class NodeIt : public Node { |
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| 22 | const Graph* graph; |
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| 23 | public: |
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| 24 | |
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| 25 | NodeIt() {} |
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| 26 | |
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| 27 | NodeIt(Invalid i) : Node(i) { } |
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| 28 | |
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| 29 | explicit NodeIt(const Graph& _graph) : Node(), graph(&_graph) { |
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| 30 | _graph.first(*static_cast<Node*>(this)); |
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| 31 | } |
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| 32 | |
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| 33 | NodeIt(const Graph& _graph, const Node& node) |
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| 34 | : Node(node), graph(&_graph) {} |
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| 35 | |
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| 36 | NodeIt& operator++() { |
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| 37 | graph->next(*this); |
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| 38 | return *this; |
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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 | |
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| 44 | class EdgeIt : public Edge { |
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| 45 | const Graph* graph; |
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| 46 | public: |
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| 47 | |
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| 48 | EdgeIt() { } |
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| 49 | |
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| 50 | EdgeIt(Invalid i) : Edge(i) { } |
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| 51 | |
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| 52 | explicit EdgeIt(const Graph& _graph) : Edge(), graph(&_graph) { |
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| 53 | _graph.first(*static_cast<Edge*>(this)); |
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| 54 | } |
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| 55 | |
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| 56 | EdgeIt(const Graph& _graph, const Edge& e) : |
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| 57 | Edge(e), graph(&_graph) { } |
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| 58 | |
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| 59 | EdgeIt& operator++() { |
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| 60 | graph->next(*this); |
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| 61 | return *this; |
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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 | |
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| 67 | class OutEdgeIt : public Edge { |
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| 68 | const Graph* graph; |
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| 69 | public: |
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| 70 | |
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| 71 | OutEdgeIt() { } |
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| 72 | |
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| 73 | OutEdgeIt(Invalid i) : Edge(i) { } |
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| 74 | |
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| 75 | OutEdgeIt(const Graph& _graph, const Node& node) |
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| 76 | : Edge(), graph(&_graph) { |
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| 77 | _graph.firstOut(*this, node); |
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| 78 | } |
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| 79 | |
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| 80 | OutEdgeIt(const Graph& _graph, const Edge& edge) |
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| 81 | : Edge(edge), graph(&_graph) {} |
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| 82 | |
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| 83 | OutEdgeIt& operator++() { |
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| 84 | graph->nextOut(*this); |
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| 85 | return *this; |
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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 | |
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| 91 | class InEdgeIt : public Edge { |
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| 92 | const Graph* graph; |
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| 93 | public: |
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| 94 | |
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| 95 | InEdgeIt() { } |
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| 96 | |
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| 97 | InEdgeIt(Invalid i) : Edge(i) { } |
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| 98 | |
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| 99 | InEdgeIt(const Graph& _graph, const Node& node) |
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| 100 | : Edge(), graph(&_graph) { |
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| 101 | _graph.firstIn(*this, node); |
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| 102 | } |
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| 103 | |
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| 104 | InEdgeIt(const Graph& _graph, const Edge& edge) : |
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| 105 | Edge(edge), graph(&_graph) {} |
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| 106 | |
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| 107 | InEdgeIt& operator++() { |
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| 108 | graph->nextIn(*this); |
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| 109 | return *this; |
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| 110 | } |
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| 111 | |
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| 112 | }; |
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| 113 | |
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| 114 | using Parent::first; |
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| 115 | |
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| 116 | private: |
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| 117 | |
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| 118 | /// \todo When (and if) we change the iterators concept to use operator*, |
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| 119 | /// then the following shadowed methods will become superfluous. |
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| 120 | /// But for now these are important safety measures. |
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| 121 | |
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| 122 | void first(NodeIt &) const; |
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| 123 | void first(EdgeIt &) const; |
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| 124 | void first(OutEdgeIt &) const; |
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| 125 | void first(InEdgeIt &) const; |
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| 126 | |
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| 127 | }; |
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| 128 | |
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| 129 | } |
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| 130 | |
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| 131 | #endif // LEMON_GRAPH_EXTENDER_H |
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