[1866] | 1 | /* -*- C++ -*- |
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| 2 | * lemon/sub_graph.h - Part of LEMON, a generic C++ optimization library |
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| 3 | * |
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[1875] | 4 | * Copyright (C) 2006 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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[1866] | 5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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| 6 | * |
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| 7 | * Permission to use, modify and distribute this software is granted |
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| 8 | * provided that this copyright notice appears in all copies. For |
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| 9 | * precise terms see the accompanying LICENSE file. |
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| 10 | * |
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| 11 | * This software is provided "AS IS" with no warranty of any kind, |
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| 12 | * express or implied, and with no claim as to its suitability for any |
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| 13 | * purpose. |
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| 14 | * |
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| 15 | */ |
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| 16 | |
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| 17 | #ifndef LEMON_SUB_GRAPH_H |
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| 18 | #define LEMON_SUB_GRAPH_H |
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| 19 | |
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| 20 | #include <lemon/graph_adaptor.h> |
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| 21 | |
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| 22 | namespace lemon { |
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| 23 | |
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| 24 | /// \brief Base for the SubGraph. |
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| 25 | /// |
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| 26 | /// Base for the SubGraph. |
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| 27 | template <typename _Graph> |
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| 28 | class SubGraphBase : public GraphAdaptorBase<const _Graph> { |
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| 29 | public: |
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| 30 | typedef _Graph Graph; |
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| 31 | typedef SubGraphBase<_Graph> SubGraph; |
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| 32 | typedef GraphAdaptorBase<const _Graph> Parent; |
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| 33 | typedef Parent Base; |
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| 34 | |
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| 35 | typedef typename Parent::Node Node; |
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| 36 | typedef typename Parent::Edge Edge; |
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| 37 | |
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| 38 | |
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| 39 | protected: |
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| 40 | |
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| 41 | class NodesImpl; |
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| 42 | class EdgesImpl; |
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| 43 | |
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| 44 | SubGraphBase() {} |
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| 45 | |
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| 46 | void construct(const Graph& _graph, NodesImpl& _nodes, EdgesImpl& _edges) { |
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| 47 | Parent::setGraph(_graph); |
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| 48 | nodes = &_nodes; |
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| 49 | edges = &_edges; |
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| 50 | firstNode = INVALID; |
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| 51 | |
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| 52 | Node node; |
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| 53 | Parent::first(node); |
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| 54 | while (node != INVALID) { |
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| 55 | (*nodes)[node].prev = node; |
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| 56 | (*nodes)[node].firstIn = INVALID; |
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| 57 | (*nodes)[node].firstOut = INVALID; |
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| 58 | Parent::next(node); |
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| 59 | } |
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| 60 | |
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| 61 | Edge edge; |
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| 62 | Parent::first(edge); |
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| 63 | while (edge != INVALID) { |
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| 64 | (*edges)[edge].prevOut = edge; |
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| 65 | Parent::next(edge); |
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| 66 | } |
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| 67 | } |
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| 68 | |
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| 69 | public: |
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| 70 | |
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| 71 | void first(Node& node) const { |
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| 72 | node = firstNode; |
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| 73 | } |
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| 74 | void next(Node& node) const { |
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| 75 | node = (*nodes)[node].next; |
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| 76 | } |
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| 77 | |
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| 78 | void first(Edge& edge) const { |
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| 79 | Node node = firstNode; |
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| 80 | while (node != INVALID && (*nodes)[node].firstOut == INVALID) { |
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| 81 | node = (*nodes)[node].next; |
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| 82 | } |
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| 83 | if (node == INVALID) { |
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| 84 | edge = INVALID; |
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| 85 | } else { |
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| 86 | edge = (*nodes)[node].firstOut; |
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| 87 | } |
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| 88 | } |
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| 89 | void next(Edge& edge) const { |
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| 90 | if ((*edges)[edge].nextOut != INVALID) { |
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| 91 | edge = (*edges)[edge].nextOut; |
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| 92 | } else { |
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| 93 | Node node = (*nodes)[source(edge)].next; |
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| 94 | while (node != INVALID && (*nodes)[node].firstOut == INVALID) { |
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| 95 | node = (*nodes)[node].next; |
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| 96 | } |
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| 97 | if (node == INVALID) { |
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| 98 | edge = INVALID; |
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| 99 | } else { |
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| 100 | edge = (*nodes)[node].firstOut; |
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| 101 | } |
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| 102 | } |
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| 103 | } |
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| 104 | |
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| 105 | void firstOut(Edge& edge, const Node& node) const { |
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| 106 | edge = (*nodes)[node].firstOut; |
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| 107 | } |
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| 108 | void nextOut(Edge& edge) const { |
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| 109 | edge = (*edges)[edge].nextOut; |
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| 110 | } |
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| 111 | |
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| 112 | void firstIn(Edge& edge, const Node& node) const { |
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| 113 | edge = (*nodes)[node].firstIn; |
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| 114 | } |
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| 115 | void nextIn(Edge& edge) const { |
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| 116 | edge = (*edges)[edge].nextIn; |
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| 117 | } |
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| 118 | |
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| 119 | /// \brief Returns true when the given node is hidden. |
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| 120 | /// |
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| 121 | /// Returns true when the given node is hidden. |
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| 122 | bool hidden(const Node& node) const { |
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| 123 | return (*nodes)[node].prev == node; |
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| 124 | } |
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| 125 | |
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| 126 | /// \brief Hide the given node in the sub-graph. |
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| 127 | /// |
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| 128 | /// Hide the given node in the sub graph. It just lace out from |
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| 129 | /// the linked lists the given node. If there are incoming or outgoing |
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| 130 | /// edges into or from this node then all of these will be hidden. |
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| 131 | void hide(const Node& node) { |
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| 132 | if (hidden(node)) return; |
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| 133 | Edge edge; |
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| 134 | firstOut(edge, node); |
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| 135 | while (edge != INVALID) { |
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| 136 | hide(edge); |
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| 137 | firstOut(edge, node); |
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| 138 | } |
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| 139 | |
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| 140 | firstOut(edge, node); |
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| 141 | while (edge != INVALID) { |
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| 142 | hide(edge); |
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| 143 | firstOut(edge, node); |
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| 144 | } |
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| 145 | if ((*nodes)[node].prev != INVALID) { |
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| 146 | (*nodes)[(*nodes)[node].prev].next = (*nodes)[node].next; |
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| 147 | } else { |
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| 148 | firstNode = (*nodes)[node].next; |
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| 149 | } |
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| 150 | if ((*nodes)[node].next != INVALID) { |
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| 151 | (*nodes)[(*nodes)[node].next].prev = (*nodes)[node].prev; |
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| 152 | } |
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| 153 | (*nodes)[node].prev = node; |
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| 154 | (*nodes)[node].firstIn = INVALID; |
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| 155 | (*nodes)[node].firstOut = INVALID; |
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| 156 | } |
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| 157 | |
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| 158 | /// \brief Unhide the given node in the sub-graph. |
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| 159 | /// |
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| 160 | /// Unhide the given node in the sub graph. It just lace in the given |
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| 161 | /// node into the linked lists. |
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| 162 | void unHide(const Node& node) { |
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| 163 | if (!hidden(node)) return; |
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| 164 | (*nodes)[node].next = firstNode; |
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| 165 | (*nodes)[node].prev = INVALID; |
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| 166 | if ((*nodes)[node].next != INVALID) { |
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| 167 | (*nodes)[(*nodes)[node].next].prev = node; |
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| 168 | } |
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| 169 | firstNode = node; |
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| 170 | } |
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| 171 | |
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| 172 | /// \brief Returns true when the given edge is hidden. |
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| 173 | /// |
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| 174 | /// Returns true when the given edge is hidden. |
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| 175 | bool hidden(const Edge& edge) const { |
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| 176 | return (*edges)[edge].prevOut == edge; |
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| 177 | } |
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| 178 | |
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| 179 | /// \brief Hide the given edge in the sub-graph. |
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| 180 | /// |
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| 181 | /// Hide the given edge in the sub graph. It just lace out from |
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| 182 | /// the linked lists the given edge. |
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| 183 | void hide(const Edge& edge) { |
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| 184 | if (hidden(edge)) return; |
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| 185 | if ((*edges)[edge].prevOut == edge) return; |
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| 186 | if ((*edges)[edge].prevOut != INVALID) { |
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| 187 | (*edges)[(*edges)[edge].prevOut].nextOut = (*edges)[edge].nextOut; |
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| 188 | } else { |
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| 189 | (*nodes)[source(edge)].firstOut = (*edges)[edge].nextOut; |
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| 190 | } |
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| 191 | if ((*edges)[edge].nextOut != INVALID) { |
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| 192 | (*edges)[(*edges)[edge].nextOut].prevOut = (*edges)[edge].prevOut; |
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| 193 | } |
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| 194 | |
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| 195 | if ((*edges)[edge].prevIn != INVALID) { |
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| 196 | (*edges)[(*edges)[edge].prevIn].nextIn = (*edges)[edge].nextIn; |
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| 197 | } else { |
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| 198 | (*nodes)[target(edge)].firstIn = (*edges)[edge].nextIn; |
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| 199 | } |
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| 200 | if ((*edges)[edge].nextIn != INVALID) { |
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| 201 | (*edges)[(*edges)[edge].nextIn].prevIn = (*edges)[edge].prevIn; |
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| 202 | } |
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| 203 | (*edges)[edge].next = edge; |
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| 204 | } |
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| 205 | |
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| 206 | /// \brief Unhide the given edge in the sub-graph. |
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| 207 | /// |
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| 208 | /// Unhide the given edge in the sub graph. It just lace in the given |
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| 209 | /// edge into the linked lists. If the source or the target of the |
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| 210 | /// node is hidden then it will unhide it. |
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| 211 | void unHide(const Edge& edge) { |
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| 212 | if (!hidden(edge)) return; |
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| 213 | |
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| 214 | Node node; |
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| 215 | |
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| 216 | node = Parent::source(edge); |
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| 217 | unHide(node); |
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| 218 | (*edges)[edge].nextOut = (*nodes)[node].firstOut; |
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| 219 | (*edges)[edge].prevOut = INVALID; |
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| 220 | if ((*edges)[edge].nextOut != INVALID) { |
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| 221 | (*edges)[(*edges)[edge].nextOut].prevOut = edge; |
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| 222 | } |
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| 223 | (*nodes)[node].firstOut = edge; |
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| 224 | |
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| 225 | node = Parent::target(edge); |
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| 226 | unHide(node); |
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| 227 | (*edges)[edge].nextIn = (*nodes)[node].firstIn; |
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| 228 | (*edges)[edge].prevIn = INVALID; |
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| 229 | if ((*edges)[edge].nextIn != INVALID) { |
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| 230 | (*edges)[(*edges)[edge].nextIn].prevIn = edge; |
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| 231 | } |
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| 232 | (*nodes)[node].firstIn = edge; |
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| 233 | } |
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| 234 | |
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| 235 | typedef False NodeNumTag; |
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| 236 | typedef False EdgeNumTag; |
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| 237 | |
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| 238 | protected: |
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| 239 | struct NodeT { |
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| 240 | Node prev, next; |
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| 241 | Edge firstIn, firstOut; |
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| 242 | }; |
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| 243 | class NodesImpl : public Graph::template NodeMap<NodeT> { |
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| 244 | friend class SubGraphBase; |
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| 245 | public: |
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| 246 | typedef typename Graph::template NodeMap<NodeT> Parent; |
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| 247 | |
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| 248 | NodesImpl(SubGraph& _adaptor, const Graph& _graph) |
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| 249 | : Parent(_graph), adaptor(_adaptor) {} |
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| 250 | |
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| 251 | virtual ~NodesImpl() {} |
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| 252 | |
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| 253 | virtual void build() { |
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| 254 | Parent::build(); |
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| 255 | Node node; |
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| 256 | adaptor.Base::first(node); |
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| 257 | while (node != INVALID) { |
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| 258 | Parent::operator[](node).prev = node; |
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| 259 | Parent::operator[](node).firstIn = INVALID; |
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| 260 | Parent::operator[](node).firstOut = INVALID; |
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| 261 | adaptor.Base::next(node); |
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| 262 | } |
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| 263 | } |
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| 264 | |
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| 265 | virtual void clear() { |
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| 266 | adaptor.firstNode = INVALID; |
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| 267 | Parent::clear(); |
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| 268 | } |
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| 269 | |
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| 270 | virtual void add(const Node& node) { |
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| 271 | Parent::add(node); |
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| 272 | Parent::operator[](node).prev = node; |
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| 273 | Parent::operator[](node).firstIn = INVALID; |
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| 274 | Parent::operator[](node).firstOut = INVALID; |
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| 275 | } |
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| 276 | virtual void add(const std::vector<Node>& nodes) { |
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| 277 | Parent::add(nodes); |
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| 278 | for (int i = 0; i < (int)nodes.size(); ++i) { |
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| 279 | Parent::operator[](nodes[i]).prev = nodes[i]; |
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| 280 | Parent::operator[](nodes[i]).firstIn = INVALID; |
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| 281 | Parent::operator[](nodes[i]).firstOut = INVALID; |
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| 282 | } |
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| 283 | } |
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| 284 | |
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| 285 | virtual void erase(const Node& node) { |
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| 286 | adaptor.hide(node); |
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| 287 | Parent::erase(node); |
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| 288 | } |
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| 289 | |
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| 290 | virtual void erase(const std::vector<Node>& nodes) { |
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| 291 | for (int i = 0; i < (int)nodes.size(); ++i) { |
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| 292 | adaptor.hide(nodes[i]); |
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| 293 | } |
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| 294 | Parent::erase(nodes); |
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| 295 | } |
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| 296 | |
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| 297 | private: |
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| 298 | SubGraph& adaptor; |
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| 299 | }; |
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| 300 | |
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| 301 | struct EdgeT { |
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| 302 | Edge prevOut, nextOut; |
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| 303 | Edge prevIn, nextIn; |
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| 304 | }; |
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| 305 | class EdgesImpl : public Graph::template EdgeMap<EdgeT> { |
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| 306 | friend class SubGraphBase; |
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| 307 | public: |
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| 308 | typedef typename Graph::template EdgeMap<EdgeT> Parent; |
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| 309 | |
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| 310 | EdgesImpl(SubGraph& _adaptor, const Graph& _graph) |
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| 311 | : Parent(_graph), adaptor(_adaptor) {} |
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| 312 | |
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| 313 | virtual ~EdgesImpl() {} |
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| 314 | |
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| 315 | virtual void build() { |
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| 316 | Parent::build(); |
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| 317 | Edge edge; |
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| 318 | adaptor.Base::first(edge); |
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| 319 | while (edge != INVALID) { |
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| 320 | Parent::operator[](edge).prevOut = edge; |
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| 321 | adaptor.Base::next(edge); |
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| 322 | } |
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| 323 | } |
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| 324 | |
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| 325 | virtual void clear() { |
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| 326 | Node node; |
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| 327 | adaptor.first(node); |
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| 328 | while (node != INVALID) { |
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| 329 | (*adaptor.nodes).firstIn = INVALID; |
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| 330 | (*adaptor.nodes).firstOut = INVALID; |
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| 331 | adaptor.next(node); |
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| 332 | } |
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| 333 | Parent::clear(); |
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| 334 | } |
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| 335 | |
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| 336 | virtual void add(const Edge& edge) { |
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| 337 | Parent::add(edge); |
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| 338 | Parent::operator[](edge).prevOut = edge; |
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| 339 | } |
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| 340 | |
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| 341 | virtual void add(const std::vector<Edge>& edges) { |
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| 342 | Parent::add(edges); |
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| 343 | for (int i = 0; i < (int)edges.size(); ++i) { |
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| 344 | Parent::operator[](edges[i]).prevOut = edges[i]; |
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| 345 | } |
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| 346 | } |
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| 347 | |
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| 348 | virtual void erase(const Edge& edge) { |
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| 349 | adaptor.hide(edge); |
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| 350 | Parent::erase(edge); |
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| 351 | } |
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| 352 | |
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| 353 | virtual void erase(const std::vector<Edge>& edges) { |
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| 354 | for (int i = 0; i < (int)edges.size(); ++i) { |
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| 355 | adaptor.hide(edges[i]); |
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| 356 | } |
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| 357 | Parent::erase(edge); |
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| 358 | } |
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| 359 | |
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| 360 | private: |
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| 361 | SubGraph& adaptor; |
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| 362 | }; |
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| 363 | |
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| 364 | NodesImpl* nodes; |
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| 365 | EdgesImpl* edges; |
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| 366 | Node firstNode; |
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| 367 | }; |
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| 368 | |
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| 369 | /// \ingroup semi_adaptors |
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| 370 | /// |
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| 371 | /// \brief Graph which uses a subset of an other graph's nodes and edges. |
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| 372 | /// |
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| 373 | /// Graph which uses a subset of an other graph's nodes and edges. This class |
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| 374 | /// is an alternative to the SubGraphAdaptor which is created for the |
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| 375 | /// same reason. The main difference between the two class that it |
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| 376 | /// makes linked lists on the unhidden nodes and edges what cause that |
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| 377 | /// on sparse subgraphs the algorithms can be more efficient and some times |
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| 378 | /// provide better time complexity. On other way this implemetation is |
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| 379 | /// less efficient in most case when the subgraph filters out only |
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| 380 | /// a few nodes or edges. |
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| 381 | /// |
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| 382 | /// \see SubGraphAdaptor |
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| 383 | /// \see EdgeSubGraphBase |
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| 384 | template <typename Graph> |
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| 385 | class SubGraph |
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| 386 | : public IterableGraphExtender< SubGraphBase<Graph> > { |
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| 387 | public: |
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| 388 | typedef IterableGraphExtender< SubGraphBase<Graph> > Parent; |
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| 389 | public: |
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| 390 | /// \brief Constructor for sub-graph. |
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| 391 | /// |
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| 392 | /// Constructor for sub-graph. Initially all the edges and nodes |
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| 393 | /// are hidden in the graph. |
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| 394 | SubGraph(const Graph& _graph) |
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| 395 | : Parent(), nodes(*this, _graph), edges(*this, _graph) { |
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| 396 | Parent::construct(_graph, nodes, edges); |
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| 397 | } |
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| 398 | private: |
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| 399 | typename Parent::NodesImpl nodes; |
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| 400 | typename Parent::EdgesImpl edges; |
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| 401 | }; |
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| 402 | |
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| 403 | /// \brief Base for the EdgeSubGraph. |
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| 404 | /// |
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| 405 | /// Base for the EdgeSubGraph. |
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| 406 | template <typename _Graph> |
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| 407 | class EdgeSubGraphBase : public GraphAdaptorBase<const _Graph> { |
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| 408 | public: |
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| 409 | typedef _Graph Graph; |
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| 410 | typedef EdgeSubGraphBase<_Graph> SubGraph; |
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| 411 | typedef GraphAdaptorBase<const _Graph> Parent; |
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| 412 | typedef Parent Base; |
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| 413 | |
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| 414 | typedef typename Parent::Node Node; |
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| 415 | typedef typename Parent::Edge Edge; |
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| 416 | |
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| 417 | |
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| 418 | protected: |
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| 419 | |
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| 420 | class NodesImpl; |
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| 421 | class EdgesImpl; |
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| 422 | |
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| 423 | EdgeSubGraphBase() {} |
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| 424 | |
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| 425 | void construct(const Graph& _graph, NodesImpl& _nodes, EdgesImpl& _edges) { |
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| 426 | Parent::setGraph(_graph); |
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| 427 | nodes = &_nodes; |
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| 428 | edges = &_edges; |
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| 429 | |
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| 430 | Node node; |
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| 431 | Parent::first(node); |
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| 432 | while (node != INVALID) { |
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| 433 | (*nodes)[node].firstIn = INVALID; |
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| 434 | (*nodes)[node].firstOut = INVALID; |
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| 435 | Parent::next(node); |
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| 436 | } |
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| 437 | |
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| 438 | Edge edge; |
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| 439 | Parent::first(edge); |
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| 440 | while (edge != INVALID) { |
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| 441 | (*edges)[edge].prevOut = edge; |
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| 442 | Parent::next(edge); |
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| 443 | } |
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| 444 | } |
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| 445 | |
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| 446 | public: |
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| 447 | |
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| 448 | void first(Node& node) const { |
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| 449 | Parent::first(node); |
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| 450 | } |
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| 451 | void next(Node& node) const { |
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| 452 | Parent::next(node); |
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| 453 | } |
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| 454 | |
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| 455 | void first(Edge& edge) const { |
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| 456 | Node node; |
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| 457 | Parent::first(node); |
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| 458 | while (node != INVALID && (*nodes)[node].firstOut == INVALID) { |
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| 459 | Parent::next(node); |
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| 460 | } |
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| 461 | if (node == INVALID) { |
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| 462 | edge = INVALID; |
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| 463 | } else { |
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| 464 | edge = (*nodes)[node].firstOut; |
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| 465 | } |
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| 466 | } |
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| 467 | void next(Edge& edge) const { |
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| 468 | if ((*edges)[edge].nextOut != INVALID) { |
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| 469 | edge = (*edges)[edge].nextOut; |
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| 470 | } else { |
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| 471 | Node node = source(edge); |
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| 472 | Parent::next(node); |
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| 473 | while (node != INVALID && (*nodes)[node].firstOut == INVALID) { |
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| 474 | Parent::next(node); |
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| 475 | } |
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| 476 | if (node == INVALID) { |
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| 477 | edge = INVALID; |
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| 478 | } else { |
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| 479 | edge = (*nodes)[node].firstOut; |
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| 480 | } |
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| 481 | } |
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| 482 | } |
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| 483 | |
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| 484 | void firstOut(Edge& edge, const Node& node) const { |
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| 485 | edge = (*nodes)[node].firstOut; |
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| 486 | } |
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| 487 | void nextOut(Edge& edge) const { |
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| 488 | edge = (*edges)[edge].nextOut; |
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| 489 | } |
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| 490 | |
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| 491 | void firstIn(Edge& edge, const Node& node) const { |
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| 492 | edge = (*nodes)[node].firstIn; |
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| 493 | } |
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| 494 | void nextIn(Edge& edge) const { |
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| 495 | edge = (*edges)[edge].nextIn; |
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| 496 | } |
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| 497 | |
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| 498 | /// \brief Returns true when the given edge is hidden. |
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| 499 | /// |
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| 500 | /// Returns true when the given edge is hidden. |
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| 501 | bool hidden(const Edge& edge) const { |
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| 502 | return (*edges)[edge].prevOut == edge; |
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| 503 | } |
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| 504 | |
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| 505 | /// \brief Hide the given edge in the sub-graph. |
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| 506 | /// |
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| 507 | /// Hide the given edge in the sub graph. It just lace out from |
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| 508 | /// the linked lists the given edge. |
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| 509 | void hide(const Edge& edge) { |
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| 510 | if (hidden(edge)) return; |
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| 511 | if ((*edges)[edge].prevOut != INVALID) { |
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| 512 | (*edges)[(*edges)[edge].prevOut].nextOut = (*edges)[edge].nextOut; |
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| 513 | } else { |
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| 514 | (*nodes)[source(edge)].firstOut = (*edges)[edge].nextOut; |
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| 515 | } |
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| 516 | if ((*edges)[edge].nextOut != INVALID) { |
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| 517 | (*edges)[(*edges)[edge].nextOut].prevOut = (*edges)[edge].prevOut; |
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| 518 | } |
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| 519 | |
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| 520 | if ((*edges)[edge].prevIn != INVALID) { |
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| 521 | (*edges)[(*edges)[edge].prevIn].nextIn = (*edges)[edge].nextIn; |
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| 522 | } else { |
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| 523 | (*nodes)[target(edge)].firstIn = (*edges)[edge].nextIn; |
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| 524 | } |
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| 525 | if ((*edges)[edge].nextIn != INVALID) { |
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| 526 | (*edges)[(*edges)[edge].nextIn].prevIn = (*edges)[edge].prevIn; |
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| 527 | } |
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| 528 | (*edges)[edge].prevOut = edge; |
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| 529 | } |
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| 530 | |
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| 531 | /// \brief Unhide the given edge in the sub-graph. |
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| 532 | /// |
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| 533 | /// Unhide the given edge in the sub graph. It just lace in the given |
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| 534 | /// edge into the linked lists. |
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| 535 | void unHide(const Edge& edge) { |
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| 536 | if (!hidden(edge)) return; |
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| 537 | Node node; |
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| 538 | |
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| 539 | node = Parent::source(edge); |
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| 540 | (*edges)[edge].nextOut = (*nodes)[node].firstOut; |
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| 541 | (*edges)[edge].prevOut = INVALID; |
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| 542 | if ((*edges)[edge].nextOut != INVALID) { |
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| 543 | (*edges)[(*edges)[edge].nextOut].prevOut = edge; |
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| 544 | } |
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| 545 | (*nodes)[node].firstOut = edge; |
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| 546 | |
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| 547 | node = Parent::target(edge); |
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| 548 | (*edges)[edge].nextIn = (*nodes)[node].firstIn; |
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| 549 | (*edges)[edge].prevIn = INVALID; |
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| 550 | if ((*edges)[edge].nextIn != INVALID) { |
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| 551 | (*edges)[(*edges)[edge].nextIn].prevIn = edge; |
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| 552 | } |
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| 553 | (*nodes)[node].firstIn = edge; |
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| 554 | } |
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| 555 | |
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| 556 | protected: |
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| 557 | struct NodeT { |
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| 558 | Edge firstIn, firstOut; |
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| 559 | }; |
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| 560 | class NodesImpl : public Graph::template NodeMap<NodeT> { |
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| 561 | friend class EdgeSubGraphBase; |
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| 562 | public: |
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| 563 | typedef typename Graph::template NodeMap<NodeT> Parent; |
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| 564 | |
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| 565 | NodesImpl(SubGraph& _adaptor, const Graph& _graph) |
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| 566 | : Parent(_graph), adaptor(_adaptor) {} |
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| 567 | |
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| 568 | virtual ~NodesImpl() {} |
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| 569 | |
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| 570 | virtual void build() { |
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| 571 | Parent::build(); |
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| 572 | Node node; |
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| 573 | adaptor.Base::first(node); |
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| 574 | while (node != INVALID) { |
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| 575 | Parent::operator[](node).firstIn = INVALID; |
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| 576 | Parent::operator[](node).firstOut = INVALID; |
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| 577 | adaptor.Base::next(node); |
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| 578 | } |
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| 579 | } |
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| 580 | |
---|
| 581 | virtual void add(const Node& node) { |
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| 582 | Parent::add(node); |
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| 583 | Parent::operator[](node).firstIn = INVALID; |
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| 584 | Parent::operator[](node).firstOut = INVALID; |
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| 585 | } |
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| 586 | |
---|
| 587 | private: |
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| 588 | SubGraph& adaptor; |
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| 589 | }; |
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| 590 | |
---|
| 591 | struct EdgeT { |
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| 592 | Edge prevOut, nextOut; |
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| 593 | Edge prevIn, nextIn; |
---|
| 594 | }; |
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| 595 | class EdgesImpl : public Graph::template EdgeMap<EdgeT> { |
---|
| 596 | friend class EdgeSubGraphBase; |
---|
| 597 | public: |
---|
| 598 | typedef typename Graph::template EdgeMap<EdgeT> Parent; |
---|
| 599 | |
---|
| 600 | EdgesImpl(SubGraph& _adaptor, const Graph& _graph) |
---|
| 601 | : Parent(_graph), adaptor(_adaptor) {} |
---|
| 602 | |
---|
| 603 | virtual ~EdgesImpl() {} |
---|
| 604 | |
---|
| 605 | virtual void build() { |
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| 606 | Parent::build(); |
---|
| 607 | Edge edge; |
---|
| 608 | adaptor.Base::first(edge); |
---|
| 609 | while (edge != INVALID) { |
---|
| 610 | Parent::operator[](edge).prevOut = edge; |
---|
| 611 | adaptor.Base::next(edge); |
---|
| 612 | } |
---|
| 613 | } |
---|
| 614 | |
---|
| 615 | virtual void clear() { |
---|
| 616 | Node node; |
---|
| 617 | adaptor.Base::first(node); |
---|
| 618 | while (node != INVALID) { |
---|
| 619 | (*adaptor.nodes)[node].firstIn = INVALID; |
---|
| 620 | (*adaptor.nodes)[node].firstOut = INVALID; |
---|
| 621 | adaptor.Base::next(node); |
---|
| 622 | } |
---|
| 623 | Parent::clear(); |
---|
| 624 | } |
---|
| 625 | |
---|
| 626 | virtual void add(const Edge& edge) { |
---|
| 627 | Parent::add(edge); |
---|
| 628 | Parent::operator[](edge).prevOut = edge; |
---|
| 629 | } |
---|
| 630 | |
---|
| 631 | virtual void add(const std::vector<Edge>& edges) { |
---|
| 632 | Parent::add(edges); |
---|
| 633 | for (int i = 0; i < (int)edges.size(); ++i) { |
---|
| 634 | Parent::operator[](edges[i]).prevOut = edges[i]; |
---|
| 635 | } |
---|
| 636 | } |
---|
| 637 | |
---|
| 638 | virtual void erase(const Edge& edge) { |
---|
| 639 | adaptor.hide(edge); |
---|
| 640 | Parent::erase(edge); |
---|
| 641 | } |
---|
| 642 | |
---|
| 643 | virtual void erase(const std::vector<Edge>& edges) { |
---|
| 644 | for (int i = 0; i < (int)edges.size(); ++i) { |
---|
| 645 | adaptor.hide(edges[i]); |
---|
| 646 | } |
---|
| 647 | Parent::erase(edge); |
---|
| 648 | } |
---|
| 649 | |
---|
| 650 | private: |
---|
| 651 | SubGraph& adaptor; |
---|
| 652 | }; |
---|
| 653 | |
---|
| 654 | NodesImpl* nodes; |
---|
| 655 | EdgesImpl* edges; |
---|
| 656 | }; |
---|
| 657 | |
---|
| 658 | /// \ingroup semi_adaptors |
---|
| 659 | /// |
---|
| 660 | /// \brief Graph which uses a subset of an other graph's edges. |
---|
| 661 | /// |
---|
| 662 | /// Graph which uses a subset of an other graph's edges. This class |
---|
| 663 | /// is an alternative to the EdgeSubGraphAdaptor which is created for the |
---|
| 664 | /// same reason. The main difference between the two class that it |
---|
| 665 | /// makes linked lists on the unhidden edges what cause that |
---|
| 666 | /// on sparse subgraphs the algorithms can be more efficient and some times |
---|
| 667 | /// provide better time complexity. On other way this implemetation is |
---|
| 668 | /// less efficient in most case when the subgraph filters out only |
---|
| 669 | /// a few edges. |
---|
| 670 | /// |
---|
| 671 | /// \see EdgeSubGraphAdaptor |
---|
| 672 | /// \see EdgeSubGraphBase |
---|
| 673 | template <typename Graph> |
---|
| 674 | class EdgeSubGraph |
---|
| 675 | : public IterableGraphExtender< EdgeSubGraphBase<Graph> > { |
---|
| 676 | public: |
---|
| 677 | typedef IterableGraphExtender< EdgeSubGraphBase<Graph> > Parent; |
---|
| 678 | public: |
---|
| 679 | /// \brief Constructor for sub-graph. |
---|
| 680 | /// |
---|
| 681 | /// Constructor for sub-graph. Initially all the edges are hidden in the |
---|
| 682 | /// graph. |
---|
| 683 | EdgeSubGraph(const Graph& _graph) |
---|
| 684 | : Parent(), nodes(*this, _graph), edges(*this, _graph) { |
---|
| 685 | Parent::construct(_graph, nodes, edges); |
---|
| 686 | } |
---|
| 687 | private: |
---|
| 688 | typename Parent::NodesImpl nodes; |
---|
| 689 | typename Parent::EdgesImpl edges; |
---|
| 690 | }; |
---|
| 691 | |
---|
| 692 | |
---|
| 693 | // template<typename Graph, typename Number, |
---|
| 694 | // typename CapacityMap, typename FlowMap> |
---|
| 695 | // class ResGraph |
---|
| 696 | // : public IterableGraphExtender<EdgeSubGraphBase< |
---|
| 697 | // UndirGraphAdaptor<Graph> > > { |
---|
| 698 | // public: |
---|
| 699 | // typedef IterableGraphExtender<EdgeSubGraphBase< |
---|
| 700 | // UndirGraphAdaptor<Graph> > > Parent; |
---|
| 701 | |
---|
| 702 | // protected: |
---|
| 703 | // UndirGraphAdaptor<Graph> undir; |
---|
| 704 | |
---|
| 705 | // const CapacityMap* capacity; |
---|
| 706 | // FlowMap* flow; |
---|
| 707 | |
---|
| 708 | // typename Parent::NodesImpl nodes; |
---|
| 709 | // typename Parent::EdgesImpl edges; |
---|
| 710 | |
---|
| 711 | // void setCapacityMap(const CapacityMap& _capacity) { |
---|
| 712 | // capacity=&_capacity; |
---|
| 713 | // } |
---|
| 714 | |
---|
| 715 | // void setFlowMap(FlowMap& _flow) { |
---|
| 716 | // flow=&_flow; |
---|
| 717 | // } |
---|
| 718 | |
---|
| 719 | // public: |
---|
| 720 | |
---|
| 721 | // typedef typename UndirGraphAdaptor<Graph>::Node Node; |
---|
| 722 | // typedef typename UndirGraphAdaptor<Graph>::Edge Edge; |
---|
| 723 | // typedef typename UndirGraphAdaptor<Graph>::UndirEdge UndirEdge; |
---|
| 724 | |
---|
| 725 | // ResGraphAdaptor(Graph& _graph, |
---|
| 726 | // const CapacityMap& _capacity, FlowMap& _flow) |
---|
| 727 | // : Parent(), undir(_graph), capacity(&_capacity), flow(&_flow), |
---|
| 728 | // nodes(*this, _graph), edges(*this, _graph) { |
---|
| 729 | // Parent::construct(undir, nodes, edges); |
---|
| 730 | // setFlowMap(_flow); |
---|
| 731 | // setCapacityMap(_capacity); |
---|
| 732 | // typename Graph::Edge edge; |
---|
| 733 | // for (_graph.first(edge); edge != INVALID; _graph.next(edge)) { |
---|
| 734 | // if ((*flow)[edge] != (*capacity)[edge]) { |
---|
| 735 | // Parent::unHide(direct(edge, true)); |
---|
| 736 | // } |
---|
| 737 | // if ((*flow)[edge] != 0) { |
---|
| 738 | // Parent::unHide(direct(edge, false)); |
---|
| 739 | // } |
---|
| 740 | // } |
---|
| 741 | // } |
---|
| 742 | |
---|
| 743 | // void augment(const Edge& e, Number a) { |
---|
| 744 | // if (direction(e)) { |
---|
| 745 | // flow->set(e, (*flow)[e]+a); |
---|
| 746 | // } else { |
---|
| 747 | // flow->set(e, (*flow)[e]-a); |
---|
| 748 | // } |
---|
| 749 | // if ((*flow)[e] == (*capacity)[e]) { |
---|
| 750 | // Parent::hide(e); |
---|
| 751 | // } else { |
---|
| 752 | // Parent::unHide(e); |
---|
| 753 | // } |
---|
| 754 | // if ((*flow)[e] == 0) { |
---|
| 755 | // Parent::hide(oppositeEdge(e)); |
---|
| 756 | // } else { |
---|
| 757 | // Parent::unHide(oppositeEdge(e)); |
---|
| 758 | // } |
---|
| 759 | // } |
---|
| 760 | |
---|
| 761 | // Number resCap(const Edge& e) { |
---|
| 762 | // if (direction(e)) { |
---|
| 763 | // return (*capacity)[e]-(*flow)[e]; |
---|
| 764 | // } else { |
---|
| 765 | // return (*flow)[e]; |
---|
| 766 | // } |
---|
| 767 | // } |
---|
| 768 | |
---|
| 769 | // bool direction(const Edge& edge) const { |
---|
| 770 | // return Parent::getGraph().direction(edge); |
---|
| 771 | // } |
---|
| 772 | |
---|
| 773 | // Edge direct(const UndirEdge& edge, bool direction) const { |
---|
| 774 | // return Parent::getGraph().direct(edge, direction); |
---|
| 775 | // } |
---|
| 776 | |
---|
| 777 | // Edge direct(const UndirEdge& edge, const Node& node) const { |
---|
| 778 | // return Parent::getGraph().direct(edge, node); |
---|
| 779 | // } |
---|
| 780 | |
---|
| 781 | // Edge oppositeEdge(const Edge& edge) const { |
---|
| 782 | // return Parent::getGraph().oppositeEdge(edge); |
---|
| 783 | // } |
---|
| 784 | |
---|
| 785 | // /// \brief Residual capacity map. |
---|
| 786 | // /// |
---|
| 787 | // /// In generic residual graphs the residual capacity can be obtained |
---|
| 788 | // /// as a map. |
---|
| 789 | // class ResCap { |
---|
| 790 | // protected: |
---|
| 791 | // const ResGraphAdaptor* res_graph; |
---|
| 792 | // public: |
---|
| 793 | // typedef Number Value; |
---|
| 794 | // typedef Edge Key; |
---|
| 795 | // ResCap(const ResGraphAdaptor& _res_graph) |
---|
| 796 | // : res_graph(&_res_graph) {} |
---|
| 797 | // Number operator[](const Edge& e) const { |
---|
| 798 | // return res_graph->resCap(e); |
---|
| 799 | // } |
---|
| 800 | // }; |
---|
| 801 | // }; |
---|
| 802 | |
---|
| 803 | } |
---|
| 804 | |
---|
| 805 | #endif |
---|