[962] | 1 | /* -*- C++ -*- |
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| 2 | * |
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[1435] | 3 | * lemon/concept/undir_graph_component.h - Part of LEMON, a generic |
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[962] | 4 | * C++ optimization library |
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| 5 | * |
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[1164] | 6 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi |
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[1359] | 7 | * Kutatocsoport (Egervary Research Group on Combinatorial Optimization, |
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[962] | 8 | * EGRES). |
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| 9 | * |
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| 10 | * Permission to use, modify and distribute this software is granted |
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| 11 | * provided that this copyright notice appears in all copies. For |
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| 12 | * precise terms see the accompanying LICENSE file. |
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| 13 | * |
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| 14 | * This software is provided "AS IS" with no warranty of any kind, |
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| 15 | * express or implied, and with no claim as to its suitability for any |
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| 16 | * purpose. |
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| 17 | * |
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| 18 | */ |
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| 19 | |
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[1030] | 20 | ///\ingroup graph_concepts |
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[962] | 21 | ///\file |
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| 22 | ///\brief Undirected graphs and components of. |
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| 23 | |
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| 24 | |
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| 25 | #ifndef LEMON_CONCEPT_UNDIR_GRAPH_H |
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| 26 | #define LEMON_CONCEPT_UNDIR_GRAPH_H |
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| 27 | |
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| 28 | #include <lemon/concept/graph_component.h> |
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[1448] | 29 | #include <lemon/utility.h> |
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[962] | 30 | |
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| 31 | namespace lemon { |
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| 32 | namespace concept { |
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| 33 | |
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[1030] | 34 | /// \addtogroup graph_concepts |
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| 35 | /// @{ |
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| 36 | |
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| 37 | |
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| 38 | /// Skeleton class which describes an edge with direction in \ref |
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| 39 | /// UndirGraph "undirected graph". |
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[1158] | 40 | template <typename UndirGraph> |
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| 41 | class UndirGraphEdge : public UndirGraph::UndirEdge { |
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| 42 | typedef typename UndirGraph::UndirEdge UndirEdge; |
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| 43 | typedef typename UndirGraph::Node Node; |
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[1030] | 44 | public: |
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| 45 | |
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| 46 | /// \e |
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| 47 | UndirGraphEdge() {} |
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| 48 | |
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| 49 | /// \e |
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[1367] | 50 | UndirGraphEdge(const UndirGraphEdge& e) : UndirGraph::UndirEdge(e) {} |
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[1030] | 51 | |
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| 52 | /// \e |
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| 53 | UndirGraphEdge(Invalid) {} |
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| 54 | |
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[1158] | 55 | /// \brief Directed edge from undirected edge and a source node. |
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[1030] | 56 | /// |
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[1158] | 57 | /// Constructs a directed edge from undirected edge and a source node. |
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| 58 | /// |
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| 59 | /// \note You have to specify the graph for this constructor. |
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| 60 | UndirGraphEdge(const UndirGraph &g, |
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| 61 | UndirEdge undir_edge, Node n) { |
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[1030] | 62 | ignore_unused_variable_warning(undir_edge); |
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[1158] | 63 | ignore_unused_variable_warning(g); |
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| 64 | ignore_unused_variable_warning(n); |
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[1030] | 65 | } |
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| 66 | |
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| 67 | /// \e |
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| 68 | UndirGraphEdge& operator=(UndirGraphEdge) { return *this; } |
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| 69 | |
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| 70 | /// \e |
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| 71 | bool operator==(UndirGraphEdge) const { return true; } |
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| 72 | /// \e |
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| 73 | bool operator!=(UndirGraphEdge) const { return false; } |
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| 74 | |
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| 75 | /// \e |
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| 76 | bool operator<(UndirGraphEdge) const { return false; } |
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| 77 | |
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| 78 | template <typename Edge> |
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| 79 | struct Constraints { |
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| 80 | void constraints() { |
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[1158] | 81 | const_constraints(); |
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| 82 | } |
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| 83 | void const_constraints() const { |
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[1030] | 84 | /// \bug This should be is_base_and_derived ... |
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| 85 | UndirEdge ue = e; |
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| 86 | ue = e; |
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| 87 | |
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[1158] | 88 | Edge e_with_source(graph,ue,n); |
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| 89 | ignore_unused_variable_warning(e_with_source); |
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[1030] | 90 | } |
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| 91 | Edge e; |
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[1158] | 92 | UndirEdge ue; |
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| 93 | UndirGraph graph; |
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| 94 | Node n; |
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[1030] | 95 | }; |
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| 96 | }; |
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| 97 | |
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[962] | 98 | |
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| 99 | struct BaseIterableUndirGraphConcept { |
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[989] | 100 | |
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[1022] | 101 | template <typename Graph> |
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| 102 | struct Constraints { |
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[962] | 103 | |
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[1022] | 104 | typedef typename Graph::UndirEdge UndirEdge; |
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| 105 | typedef typename Graph::Edge Edge; |
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| 106 | typedef typename Graph::Node Node; |
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[962] | 107 | |
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[1022] | 108 | void constraints() { |
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| 109 | checkConcept<BaseIterableGraphComponent, Graph>(); |
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[1030] | 110 | checkConcept<GraphItem<>, UndirEdge>(); |
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[1158] | 111 | checkConcept<UndirGraphEdge<Graph>, Edge>(); |
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[962] | 112 | |
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[1030] | 113 | graph.first(ue); |
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| 114 | graph.next(ue); |
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[1022] | 115 | |
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[1030] | 116 | const_constraints(); |
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| 117 | } |
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| 118 | void const_constraints() { |
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[1022] | 119 | Node n; |
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| 120 | n = graph.target(ue); |
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| 121 | n = graph.source(ue); |
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[1030] | 122 | n = graph.oppositeNode(n0, ue); |
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[1022] | 123 | |
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[1030] | 124 | bool b; |
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| 125 | b = graph.forward(e); |
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| 126 | ignore_unused_variable_warning(b); |
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[1022] | 127 | } |
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[1030] | 128 | |
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| 129 | Graph graph; |
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[1022] | 130 | Edge e; |
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[1030] | 131 | Node n0; |
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| 132 | UndirEdge ue; |
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[1022] | 133 | }; |
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| 134 | |
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[962] | 135 | }; |
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| 136 | |
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[1022] | 137 | |
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[962] | 138 | struct IterableUndirGraphConcept { |
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| 139 | |
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[1022] | 140 | template <typename Graph> |
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| 141 | struct Constraints { |
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| 142 | void constraints() { |
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| 143 | /// \todo we don't need the iterable component to be base iterable |
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| 144 | /// Don't we really??? |
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| 145 | //checkConcept< BaseIterableUndirGraphConcept, Graph > (); |
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[962] | 146 | |
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[1022] | 147 | checkConcept<IterableGraphComponent, Graph> (); |
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[1021] | 148 | |
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[1022] | 149 | typedef typename Graph::UndirEdge UndirEdge; |
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| 150 | typedef typename Graph::UndirEdgeIt UndirEdgeIt; |
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[1030] | 151 | typedef typename Graph::IncEdgeIt IncEdgeIt; |
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[1022] | 152 | |
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| 153 | checkConcept<GraphIterator<Graph, UndirEdge>, UndirEdgeIt>(); |
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[1030] | 154 | checkConcept<GraphIncIterator<Graph, UndirEdge>, IncEdgeIt>(); |
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[1022] | 155 | } |
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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 | struct MappableUndirGraphConcept { |
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| 161 | |
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| 162 | template <typename Graph> |
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| 163 | struct Constraints { |
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| 164 | |
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| 165 | struct Dummy { |
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| 166 | int value; |
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| 167 | Dummy() : value(0) {} |
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| 168 | Dummy(int _v) : value(_v) {} |
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| 169 | }; |
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| 170 | |
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| 171 | void constraints() { |
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| 172 | checkConcept<MappableGraphComponent, Graph>(); |
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| 173 | |
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| 174 | typedef typename Graph::template UndirEdgeMap<int> IntMap; |
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| 175 | checkConcept<GraphMap<Graph, typename Graph::UndirEdge, int>, |
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| 176 | IntMap >(); |
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| 177 | |
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| 178 | typedef typename Graph::template UndirEdgeMap<bool> BoolMap; |
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| 179 | checkConcept<GraphMap<Graph, typename Graph::UndirEdge, bool>, |
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| 180 | BoolMap >(); |
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| 181 | |
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| 182 | typedef typename Graph::template UndirEdgeMap<Dummy> DummyMap; |
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| 183 | checkConcept<GraphMap<Graph, typename Graph::UndirEdge, Dummy>, |
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| 184 | DummyMap >(); |
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| 185 | } |
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| 186 | }; |
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| 187 | |
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| 188 | }; |
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| 189 | |
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| 190 | struct ExtendableUndirGraphConcept { |
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| 191 | |
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| 192 | template <typename Graph> |
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| 193 | struct Constraints { |
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| 194 | void constraints() { |
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| 195 | node_a = graph.addNode(); |
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| 196 | uedge = graph.addEdge(node_a, node_b); |
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| 197 | } |
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| 198 | typename Graph::Node node_a, node_b; |
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| 199 | typename Graph::UndirEdge uedge; |
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| 200 | Graph graph; |
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| 201 | }; |
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| 202 | |
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| 203 | }; |
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| 204 | |
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| 205 | struct ErasableUndirGraphConcept { |
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| 206 | |
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| 207 | template <typename Graph> |
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| 208 | struct Constraints { |
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| 209 | void constraints() { |
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| 210 | graph.erase(n); |
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| 211 | graph.erase(e); |
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| 212 | } |
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| 213 | Graph graph; |
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| 214 | typename Graph::Node n; |
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| 215 | typename Graph::UndirEdge e; |
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| 216 | }; |
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| 217 | |
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| 218 | }; |
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| 219 | |
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[1030] | 220 | /// Class describing the concept of Undirected Graphs. |
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| 221 | |
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| 222 | /// This class describes the common interface of all Undirected |
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| 223 | /// Graphs. |
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| 224 | /// |
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| 225 | /// As all concept describing classes it provides only interface |
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| 226 | /// without any sensible implementation. So any algorithm for |
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| 227 | /// undirected graph should compile with this class, but it will not |
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| 228 | /// run properly, of couse. |
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| 229 | /// |
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| 230 | /// In LEMON undirected graphs also fulfill the concept of directed |
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| 231 | /// graphs (\ref lemon::concept::Graph "Graph Concept"). For |
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| 232 | /// explanation of this and more see also the page \ref undir_graphs, |
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| 233 | /// a tutorial about undirected graphs. |
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| 234 | |
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[1022] | 235 | class UndirGraph { |
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| 236 | public: |
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[1448] | 237 | ///\e |
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| 238 | |
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| 239 | ///\todo undocumented |
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| 240 | /// |
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| 241 | typedef True UndirTag; |
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[1022] | 242 | |
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[1030] | 243 | /// Type describing a node in the graph |
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| 244 | typedef GraphNode Node; |
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| 245 | |
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| 246 | /// Type describing an undirected edge |
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| 247 | typedef GraphItem<'u'> UndirEdge; |
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| 248 | |
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| 249 | /// Type describing an UndirEdge with direction |
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| 250 | #ifndef DOXYGEN |
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[1158] | 251 | typedef UndirGraphEdge<UndirGraph> Edge; |
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[1030] | 252 | #else |
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| 253 | typedef UndirGraphEdge Edge; |
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| 254 | #endif |
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| 255 | |
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| 256 | /// Iterator type which iterates over all nodes |
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| 257 | #ifndef DOXYGEN |
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| 258 | typedef GraphIterator<UndirGraph, Node> NodeIt; |
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| 259 | #else |
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| 260 | typedef GraphIterator NodeIt; |
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| 261 | #endif |
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| 262 | |
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| 263 | /// Iterator type which iterates over all undirected edges |
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| 264 | #ifndef DOXYGEN |
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| 265 | typedef GraphIterator<UndirGraph, UndirEdge> UndirEdgeIt; |
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| 266 | #else |
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| 267 | typedef GraphIterator UndirEdgeIt; |
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| 268 | #endif |
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| 269 | |
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| 270 | /// Iterator type which iterates over all directed edges. |
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| 271 | |
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| 272 | /// Iterator type which iterates over all edges (each undirected |
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| 273 | /// edge occurs twice with both directions. |
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| 274 | #ifndef DOXYGEN |
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| 275 | typedef GraphIterator<UndirGraph, Edge> EdgeIt; |
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| 276 | #else |
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| 277 | typedef GraphIterator EdgeIt; |
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| 278 | #endif |
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| 279 | |
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| 280 | |
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| 281 | /// Iterator of undirected edges incident to a node |
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| 282 | #ifndef DOXYGEN |
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| 283 | typedef GraphIncIterator<UndirGraph, UndirEdge, 'u'> IncEdgeIt; |
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| 284 | #else |
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| 285 | typedef GraphIncIterator IncEdgeIt; |
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| 286 | #endif |
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| 287 | |
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| 288 | /// Iterator of edges incoming to a node |
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| 289 | #ifndef DOXYGEN |
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| 290 | typedef GraphIncIterator<UndirGraph, Edge, 'i'> InEdgeIt; |
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| 291 | #else |
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| 292 | typedef GraphIncIterator InEdgeIt; |
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| 293 | #endif |
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| 294 | |
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| 295 | /// Iterator of edges outgoing from a node |
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| 296 | #ifndef DOXYGEN |
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| 297 | typedef GraphIncIterator<UndirGraph, Edge, 'o'> OutEdgeIt; |
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| 298 | #else |
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| 299 | typedef GraphIncIterator OutEdgeIt; |
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| 300 | #endif |
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| 301 | |
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| 302 | /// NodeMap template |
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| 303 | #ifdef DOXYGEN |
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| 304 | typedef GraphMap NodeMap<T>; |
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| 305 | #endif |
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| 306 | |
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| 307 | /// UndirEdgeMap template |
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| 308 | #ifdef DOXYGEN |
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| 309 | typedef GraphMap UndirEdgeMap<T>; |
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| 310 | #endif |
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| 311 | |
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| 312 | /// EdgeMap template |
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| 313 | #ifdef DOXYGEN |
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| 314 | typedef GraphMap EdgeMap<T>; |
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| 315 | #endif |
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| 316 | |
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| 317 | template <typename T> |
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| 318 | class NodeMap : public GraphMap<UndirGraph, Node, T> { |
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| 319 | typedef GraphMap<UndirGraph, Node, T> Parent; |
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| 320 | public: |
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| 321 | |
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| 322 | explicit NodeMap(const UndirGraph &g) : Parent(g) {} |
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| 323 | NodeMap(const UndirGraph &g, T t) : Parent(g, t) {} |
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| 324 | }; |
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| 325 | |
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| 326 | template <typename T> |
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| 327 | class UndirEdgeMap : public GraphMap<UndirGraph, UndirEdge, T> { |
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| 328 | typedef GraphMap<UndirGraph, UndirEdge, T> Parent; |
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| 329 | public: |
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| 330 | |
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| 331 | explicit UndirEdgeMap(const UndirGraph &g) : Parent(g) {} |
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| 332 | UndirEdgeMap(const UndirGraph &g, T t) : Parent(g, t) {} |
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| 333 | }; |
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| 334 | |
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| 335 | template <typename T> |
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| 336 | class EdgeMap : public GraphMap<UndirGraph, Edge, T> { |
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| 337 | typedef GraphMap<UndirGraph, Edge, T> Parent; |
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| 338 | public: |
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| 339 | |
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| 340 | explicit EdgeMap(const UndirGraph &g) : Parent(g) {} |
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| 341 | EdgeMap(const UndirGraph &g, T t) : Parent(g, t) {} |
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| 342 | }; |
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| 343 | |
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| 344 | /// Is the Edge oriented "forward"? |
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| 345 | |
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| 346 | /// Returns whether the given directed edge is same orientation as |
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| 347 | /// the corresponding undirected edge. |
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| 348 | /// |
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| 349 | /// \todo "What does the direction of an undirected edge mean?" |
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| 350 | bool forward(Edge) const { return true; } |
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| 351 | |
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| 352 | /// Opposite node on an edge |
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| 353 | |
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| 354 | /// \return the opposite of the given Node on the given Edge |
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| 355 | /// |
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| 356 | /// \todo What should we do if given Node and Edge are not incident? |
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| 357 | Node oppositeNode(Node, UndirEdge) const { return INVALID; } |
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| 358 | |
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| 359 | /// First node of the undirected edge. |
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| 360 | |
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| 361 | /// \return the first node of the given UndirEdge. |
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| 362 | /// |
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| 363 | /// Naturally undirectected edges don't have direction and thus |
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| 364 | /// don't have source and target node. But we use these two methods |
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| 365 | /// to query the two endnodes of the edge. The direction of the edge |
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| 366 | /// which arises this way is called the inherent direction of the |
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| 367 | /// undirected edge, and is used to define the "forward" direction |
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| 368 | /// of the directed versions of the edges. |
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| 369 | /// \sa forward |
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| 370 | Node source(UndirEdge) const { return INVALID; } |
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| 371 | |
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| 372 | /// Second node of the undirected edge. |
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| 373 | Node target(UndirEdge) const { return INVALID; } |
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| 374 | |
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| 375 | /// Source node of the directed edge. |
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| 376 | Node source(Edge) const { return INVALID; } |
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| 377 | |
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| 378 | /// Target node of the directed edge. |
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| 379 | Node target(Edge) const { return INVALID; } |
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| 380 | |
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| 381 | /// First node of the graph |
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| 382 | |
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| 383 | /// \note This method is part of so called \ref |
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| 384 | /// developpers_interface "Developpers' interface", so it shouldn't |
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| 385 | /// be used in an end-user program. |
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| 386 | void first(Node&) const {} |
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| 387 | /// Next node of the graph |
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| 388 | |
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| 389 | /// \note This method is part of so called \ref |
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| 390 | /// developpers_interface "Developpers' interface", so it shouldn't |
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| 391 | /// be used in an end-user program. |
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| 392 | void next(Node&) const {} |
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| 393 | |
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| 394 | /// First undirected edge of the graph |
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| 395 | |
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| 396 | /// \note This method is part of so called \ref |
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| 397 | /// developpers_interface "Developpers' interface", so it shouldn't |
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| 398 | /// be used in an end-user program. |
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| 399 | void first(UndirEdge&) const {} |
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| 400 | /// Next undirected edge of the graph |
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| 401 | |
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| 402 | /// \note This method is part of so called \ref |
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| 403 | /// developpers_interface "Developpers' interface", so it shouldn't |
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| 404 | /// be used in an end-user program. |
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| 405 | void next(UndirEdge&) const {} |
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| 406 | |
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| 407 | /// First directed edge of the graph |
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| 408 | |
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| 409 | /// \note This method is part of so called \ref |
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| 410 | /// developpers_interface "Developpers' interface", so it shouldn't |
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| 411 | /// be used in an end-user program. |
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| 412 | void first(Edge&) const {} |
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| 413 | /// Next directed edge of the graph |
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| 414 | |
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| 415 | /// \note This method is part of so called \ref |
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| 416 | /// developpers_interface "Developpers' interface", so it shouldn't |
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| 417 | /// be used in an end-user program. |
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| 418 | void next(Edge&) const {} |
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| 419 | |
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| 420 | /// First outgoing edge from a given node |
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| 421 | |
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| 422 | /// \note This method is part of so called \ref |
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| 423 | /// developpers_interface "Developpers' interface", so it shouldn't |
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| 424 | /// be used in an end-user program. |
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| 425 | void firstOut(Edge&, Node) const {} |
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| 426 | /// Next outgoing edge to a node |
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| 427 | |
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| 428 | /// \note This method is part of so called \ref |
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| 429 | /// developpers_interface "Developpers' interface", so it shouldn't |
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| 430 | /// be used in an end-user program. |
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| 431 | void nextOut(Edge&) const {} |
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| 432 | |
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| 433 | /// First incoming edge to a given node |
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| 434 | |
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| 435 | /// \note This method is part of so called \ref |
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| 436 | /// developpers_interface "Developpers' interface", so it shouldn't |
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| 437 | /// be used in an end-user program. |
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| 438 | void firstIn(Edge&, Node) const {} |
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| 439 | /// Next incoming edge to a node |
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| 440 | |
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| 441 | /// \note This method is part of so called \ref |
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| 442 | /// developpers_interface "Developpers' interface", so it shouldn't |
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| 443 | /// be used in an end-user program. |
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| 444 | void nextIn(Edge&) const {} |
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| 445 | |
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| 446 | |
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[1158] | 447 | /// Base node of the iterator |
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| 448 | /// |
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| 449 | /// Returns the base node (the source in this case) of the iterator |
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| 450 | Node baseNode(OutEdgeIt e) const { |
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| 451 | return source(e); |
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| 452 | } |
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| 453 | /// Running node of the iterator |
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| 454 | /// |
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| 455 | /// Returns the running node (the target in this case) of the |
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| 456 | /// iterator |
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| 457 | Node runningNode(OutEdgeIt e) const { |
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| 458 | return target(e); |
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| 459 | } |
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| 460 | |
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| 461 | /// Base node of the iterator |
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| 462 | /// |
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| 463 | /// Returns the base node (the target in this case) of the iterator |
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| 464 | Node baseNode(InEdgeIt e) const { |
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| 465 | return target(e); |
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| 466 | } |
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| 467 | /// Running node of the iterator |
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| 468 | /// |
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| 469 | /// Returns the running node (the source in this case) of the |
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| 470 | /// iterator |
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| 471 | Node runningNode(InEdgeIt e) const { |
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| 472 | return source(e); |
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| 473 | } |
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| 474 | |
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| 475 | /// Base node of the iterator |
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| 476 | /// |
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| 477 | /// Returns the base node of the iterator |
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[1367] | 478 | Node baseNode(IncEdgeIt) const { |
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[1158] | 479 | return INVALID; |
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| 480 | } |
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| 481 | /// Running node of the iterator |
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| 482 | /// |
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| 483 | /// Returns the running node of the iterator |
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[1367] | 484 | Node runningNode(IncEdgeIt) const { |
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[1158] | 485 | return INVALID; |
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| 486 | } |
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| 487 | |
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| 488 | |
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[1022] | 489 | template <typename Graph> |
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| 490 | struct Constraints { |
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| 491 | void constraints() { |
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| 492 | checkConcept<BaseIterableUndirGraphConcept, Graph>(); |
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| 493 | checkConcept<IterableUndirGraphConcept, Graph>(); |
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| 494 | checkConcept<MappableUndirGraphConcept, Graph>(); |
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| 495 | } |
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| 496 | }; |
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| 497 | |
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| 498 | }; |
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| 499 | |
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| 500 | class ExtendableUndirGraph : public UndirGraph { |
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| 501 | public: |
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| 502 | |
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| 503 | template <typename Graph> |
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| 504 | struct Constraints { |
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| 505 | void constraints() { |
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| 506 | checkConcept<BaseIterableUndirGraphConcept, Graph>(); |
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| 507 | checkConcept<IterableUndirGraphConcept, Graph>(); |
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| 508 | checkConcept<MappableUndirGraphConcept, Graph>(); |
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| 509 | |
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| 510 | checkConcept<UndirGraph, Graph>(); |
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| 511 | checkConcept<ExtendableUndirGraphConcept, Graph>(); |
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| 512 | checkConcept<ClearableGraphComponent, Graph>(); |
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| 513 | } |
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| 514 | }; |
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| 515 | |
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| 516 | }; |
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| 517 | |
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| 518 | class ErasableUndirGraph : public ExtendableUndirGraph { |
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| 519 | public: |
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| 520 | |
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| 521 | template <typename Graph> |
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| 522 | struct Constraints { |
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| 523 | void constraints() { |
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| 524 | checkConcept<ExtendableUndirGraph, Graph>(); |
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| 525 | checkConcept<ErasableUndirGraphConcept, Graph>(); |
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| 526 | } |
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| 527 | }; |
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| 528 | |
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[962] | 529 | }; |
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| 530 | |
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[1030] | 531 | /// @} |
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| 532 | |
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[962] | 533 | } |
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| 534 | |
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| 535 | } |
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| 536 | |
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| 537 | #endif |
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