[2260] | 1 | /* -*- C++ -*- |
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| 2 | * |
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| 3 | * This file is a part of LEMON, a generic C++ optimization library |
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| 4 | * |
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| 5 | * Copyright (C) 2003-2006 |
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| 6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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| 7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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| 8 | * |
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| 9 | * Permission to use, modify and distribute this software is granted |
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| 10 | * provided that this copyright notice appears in all copies. For |
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| 11 | * precise terms see the accompanying LICENSE file. |
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| 12 | * |
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| 13 | * This software is provided "AS IS" with no warranty of any kind, |
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| 14 | * express or implied, and with no claim as to its suitability for any |
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| 15 | * purpose. |
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| 16 | * |
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| 17 | */ |
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| 18 | |
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| 19 | ///\ingroup graph_concepts |
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| 20 | ///\file |
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| 21 | ///\brief The concept of the undirected graphs. |
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| 22 | |
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| 23 | |
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| 24 | #ifndef LEMON_CONCEPT_UGRAPH_H |
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| 25 | #define LEMON_CONCEPT_UGRAPH_H |
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| 26 | |
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| 27 | #include <lemon/concepts/graph_components.h> |
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| 28 | #include <lemon/concepts/graph.h> |
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| 29 | #include <lemon/bits/utility.h> |
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| 30 | |
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| 31 | namespace lemon { |
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| 32 | namespace concepts { |
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| 33 | |
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| 34 | /// \addtogroup graph_concepts |
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| 35 | /// @{ |
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| 36 | |
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| 37 | |
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| 38 | /// \brief Class describing the concept of Undirected Graphs. |
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| 39 | /// |
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| 40 | /// This class describes the common interface of all Undirected |
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| 41 | /// Graphs. |
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| 42 | /// |
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| 43 | /// As all concept describing classes it provides only interface |
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| 44 | /// without any sensible implementation. So any algorithm for |
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| 45 | /// undirected graph should compile with this class, but it will not |
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| 46 | /// run properly, of course. |
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| 47 | /// |
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| 48 | /// The LEMON undirected graphs also fulfill the concept of |
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| 49 | /// directed graphs (\ref lemon::concepts::Graph "Graph |
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| 50 | /// Concept"). Each undirected edges can be seen as two opposite |
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| 51 | /// directed edge and consequently the undirected graph can be |
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| 52 | /// seen as the direceted graph of these directed edges. The |
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| 53 | /// UGraph has the UEdge inner class for the undirected edges and |
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| 54 | /// the Edge type for the directed edges. The Edge type is |
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| 55 | /// convertible to UEdge or inherited from it so from a directed |
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| 56 | /// edge we can get the represented undirected edge. |
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| 57 | /// |
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| 58 | /// In the sense of the LEMON each undirected edge has a default |
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| 59 | /// direction (it should be in every computer implementation, |
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| 60 | /// because the order of undirected edge's nodes defines an |
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| 61 | /// orientation). With the default orientation we can define that |
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| 62 | /// the directed edge is forward or backward directed. With the \c |
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| 63 | /// direction() and \c direct() function we can get the direction |
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| 64 | /// of the directed edge and we can direct an undirected edge. |
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| 65 | /// |
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| 66 | /// The UEdgeIt is an iterator for the undirected edges. We can use |
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| 67 | /// the UEdgeMap to map values for the undirected edges. The InEdgeIt and |
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| 68 | /// OutEdgeIt iterates on the same undirected edges but with opposite |
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| 69 | /// direction. The IncEdgeIt iterates also on the same undirected edges |
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| 70 | /// as the OutEdgeIt and InEdgeIt but it is not convertible to Edge just |
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| 71 | /// to UEdge. |
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| 72 | class UGraph { |
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| 73 | public: |
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| 74 | /// \brief The undirected graph should be tagged by the |
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| 75 | /// UndirectedTag. |
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| 76 | /// |
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| 77 | /// The undirected graph should be tagged by the UndirectedTag. This |
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| 78 | /// tag helps the enable_if technics to make compile time |
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| 79 | /// specializations for undirected graphs. |
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| 80 | typedef True UndirectedTag; |
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| 81 | |
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| 82 | /// \brief The base type of node iterators, |
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| 83 | /// or in other words, the trivial node iterator. |
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| 84 | /// |
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| 85 | /// This is the base type of each node iterator, |
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| 86 | /// thus each kind of node iterator converts to this. |
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| 87 | /// More precisely each kind of node iterator should be inherited |
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| 88 | /// from the trivial node iterator. |
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| 89 | class Node { |
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| 90 | public: |
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| 91 | /// Default constructor |
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| 92 | |
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| 93 | /// @warning The default constructor sets the iterator |
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| 94 | /// to an undefined value. |
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| 95 | Node() { } |
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| 96 | /// Copy constructor. |
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| 97 | |
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| 98 | /// Copy constructor. |
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| 99 | /// |
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| 100 | Node(const Node&) { } |
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| 101 | |
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| 102 | /// Invalid constructor \& conversion. |
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| 103 | |
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| 104 | /// This constructor initializes the iterator to be invalid. |
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| 105 | /// \sa Invalid for more details. |
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| 106 | Node(Invalid) { } |
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| 107 | /// Equality operator |
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| 108 | |
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| 109 | /// Two iterators are equal if and only if they point to the |
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| 110 | /// same object or both are invalid. |
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| 111 | bool operator==(Node) const { return true; } |
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| 112 | |
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| 113 | /// Inequality operator |
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| 114 | |
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| 115 | /// \sa operator==(Node n) |
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| 116 | /// |
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| 117 | bool operator!=(Node) const { return true; } |
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| 118 | |
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| 119 | /// Artificial ordering operator. |
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| 120 | |
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| 121 | /// To allow the use of graph descriptors as key type in std::map or |
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| 122 | /// similar associative container we require this. |
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| 123 | /// |
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| 124 | /// \note This operator only have to define some strict ordering of |
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| 125 | /// the items; this order has nothing to do with the iteration |
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| 126 | /// ordering of the items. |
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| 127 | bool operator<(Node) const { return false; } |
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| 128 | |
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| 129 | }; |
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| 130 | |
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| 131 | /// This iterator goes through each node. |
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| 132 | |
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| 133 | /// This iterator goes through each node. |
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| 134 | /// Its usage is quite simple, for example you can count the number |
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| 135 | /// of nodes in graph \c g of type \c Graph like this: |
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| 136 | ///\code |
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| 137 | /// int count=0; |
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| 138 | /// for (Graph::NodeIt n(g); n!=INVALID; ++n) ++count; |
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| 139 | ///\endcode |
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| 140 | class NodeIt : public Node { |
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| 141 | public: |
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| 142 | /// Default constructor |
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| 143 | |
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| 144 | /// @warning The default constructor sets the iterator |
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| 145 | /// to an undefined value. |
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| 146 | NodeIt() { } |
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| 147 | /// Copy constructor. |
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| 148 | |
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| 149 | /// Copy constructor. |
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| 150 | /// |
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| 151 | NodeIt(const NodeIt& n) : Node(n) { } |
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| 152 | /// Invalid constructor \& conversion. |
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| 153 | |
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| 154 | /// Initialize the iterator to be invalid. |
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| 155 | /// \sa Invalid for more details. |
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| 156 | NodeIt(Invalid) { } |
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| 157 | /// Sets the iterator to the first node. |
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| 158 | |
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| 159 | /// Sets the iterator to the first node of \c g. |
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| 160 | /// |
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| 161 | NodeIt(const UGraph&) { } |
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| 162 | /// Node -> NodeIt conversion. |
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| 163 | |
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| 164 | /// Sets the iterator to the node of \c the graph pointed by |
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| 165 | /// the trivial iterator. |
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| 166 | /// This feature necessitates that each time we |
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| 167 | /// iterate the edge-set, the iteration order is the same. |
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| 168 | NodeIt(const UGraph&, const Node&) { } |
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| 169 | /// Next node. |
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| 170 | |
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| 171 | /// Assign the iterator to the next node. |
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| 172 | /// |
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| 173 | NodeIt& operator++() { return *this; } |
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| 174 | }; |
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| 175 | |
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| 176 | |
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| 177 | /// The base type of the undirected edge iterators. |
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| 178 | |
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| 179 | /// The base type of the undirected edge iterators. |
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| 180 | /// |
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| 181 | class UEdge { |
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| 182 | public: |
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| 183 | /// Default constructor |
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| 184 | |
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| 185 | /// @warning The default constructor sets the iterator |
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| 186 | /// to an undefined value. |
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| 187 | UEdge() { } |
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| 188 | /// Copy constructor. |
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| 189 | |
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| 190 | /// Copy constructor. |
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| 191 | /// |
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| 192 | UEdge(const UEdge&) { } |
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| 193 | /// Initialize the iterator to be invalid. |
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| 194 | |
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| 195 | /// Initialize the iterator to be invalid. |
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| 196 | /// |
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| 197 | UEdge(Invalid) { } |
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| 198 | /// Equality operator |
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| 199 | |
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| 200 | /// Two iterators are equal if and only if they point to the |
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| 201 | /// same object or both are invalid. |
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| 202 | bool operator==(UEdge) const { return true; } |
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| 203 | /// Inequality operator |
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| 204 | |
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| 205 | /// \sa operator==(UEdge n) |
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| 206 | /// |
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| 207 | bool operator!=(UEdge) const { return true; } |
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| 208 | |
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| 209 | /// Artificial ordering operator. |
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| 210 | |
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| 211 | /// To allow the use of graph descriptors as key type in std::map or |
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| 212 | /// similar associative container we require this. |
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| 213 | /// |
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| 214 | /// \note This operator only have to define some strict ordering of |
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| 215 | /// the items; this order has nothing to do with the iteration |
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| 216 | /// ordering of the items. |
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| 217 | bool operator<(UEdge) const { return false; } |
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| 218 | }; |
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| 219 | |
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| 220 | /// This iterator goes through each undirected edge. |
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| 221 | |
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| 222 | /// This iterator goes through each undirected edge of a graph. |
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| 223 | /// Its usage is quite simple, for example you can count the number |
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| 224 | /// of undirected edges in a graph \c g of type \c Graph as follows: |
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| 225 | ///\code |
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| 226 | /// int count=0; |
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| 227 | /// for(Graph::UEdgeIt e(g); e!=INVALID; ++e) ++count; |
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| 228 | ///\endcode |
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| 229 | class UEdgeIt : public UEdge { |
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| 230 | public: |
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| 231 | /// Default constructor |
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| 232 | |
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| 233 | /// @warning The default constructor sets the iterator |
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| 234 | /// to an undefined value. |
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| 235 | UEdgeIt() { } |
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| 236 | /// Copy constructor. |
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| 237 | |
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| 238 | /// Copy constructor. |
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| 239 | /// |
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| 240 | UEdgeIt(const UEdgeIt& e) : UEdge(e) { } |
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| 241 | /// Initialize the iterator to be invalid. |
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| 242 | |
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| 243 | /// Initialize the iterator to be invalid. |
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| 244 | /// |
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| 245 | UEdgeIt(Invalid) { } |
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| 246 | /// This constructor sets the iterator to the first undirected edge. |
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| 247 | |
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| 248 | /// This constructor sets the iterator to the first undirected edge. |
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| 249 | UEdgeIt(const UGraph&) { } |
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| 250 | /// UEdge -> UEdgeIt conversion |
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| 251 | |
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| 252 | /// Sets the iterator to the value of the trivial iterator. |
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| 253 | /// This feature necessitates that each time we |
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| 254 | /// iterate the undirected edge-set, the iteration order is the |
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| 255 | /// same. |
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| 256 | UEdgeIt(const UGraph&, const UEdge&) { } |
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| 257 | /// Next undirected edge |
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| 258 | |
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| 259 | /// Assign the iterator to the next undirected edge. |
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| 260 | UEdgeIt& operator++() { return *this; } |
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| 261 | }; |
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| 262 | |
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| 263 | /// \brief This iterator goes trough the incident undirected |
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| 264 | /// edges of a node. |
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| 265 | /// |
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| 266 | /// This iterator goes trough the incident undirected edges |
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| 267 | /// of a certain node of a graph. You should assume that the |
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| 268 | /// loop edges will be iterated twice. |
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| 269 | /// |
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| 270 | /// Its usage is quite simple, for example you can compute the |
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| 271 | /// degree (i.e. count the number of incident edges of a node \c n |
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| 272 | /// in graph \c g of type \c Graph as follows. |
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| 273 | /// |
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| 274 | ///\code |
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| 275 | /// int count=0; |
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| 276 | /// for(Graph::IncEdgeIt e(g, n); e!=INVALID; ++e) ++count; |
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| 277 | ///\endcode |
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| 278 | class IncEdgeIt : public UEdge { |
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| 279 | public: |
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| 280 | /// Default constructor |
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| 281 | |
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| 282 | /// @warning The default constructor sets the iterator |
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| 283 | /// to an undefined value. |
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| 284 | IncEdgeIt() { } |
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| 285 | /// Copy constructor. |
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| 286 | |
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| 287 | /// Copy constructor. |
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| 288 | /// |
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| 289 | IncEdgeIt(const IncEdgeIt& e) : UEdge(e) { } |
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| 290 | /// Initialize the iterator to be invalid. |
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| 291 | |
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| 292 | /// Initialize the iterator to be invalid. |
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| 293 | /// |
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| 294 | IncEdgeIt(Invalid) { } |
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| 295 | /// This constructor sets the iterator to first incident edge. |
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| 296 | |
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| 297 | /// This constructor set the iterator to the first incident edge of |
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| 298 | /// the node. |
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| 299 | IncEdgeIt(const UGraph&, const Node&) { } |
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| 300 | /// UEdge -> IncEdgeIt conversion |
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| 301 | |
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| 302 | /// Sets the iterator to the value of the trivial iterator \c e. |
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| 303 | /// This feature necessitates that each time we |
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| 304 | /// iterate the edge-set, the iteration order is the same. |
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| 305 | IncEdgeIt(const UGraph&, const UEdge&) { } |
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| 306 | /// Next incident edge |
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| 307 | |
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| 308 | /// Assign the iterator to the next incident edge |
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| 309 | /// of the corresponding node. |
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| 310 | IncEdgeIt& operator++() { return *this; } |
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| 311 | }; |
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| 312 | |
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| 313 | /// The directed edge type. |
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| 314 | |
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| 315 | /// The directed edge type. It can be converted to the |
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| 316 | /// undirected edge or it should be inherited from the undirected |
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| 317 | /// edge. |
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| 318 | class Edge : public UEdge { |
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| 319 | public: |
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| 320 | /// Default constructor |
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| 321 | |
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| 322 | /// @warning The default constructor sets the iterator |
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| 323 | /// to an undefined value. |
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| 324 | Edge() { } |
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| 325 | /// Copy constructor. |
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| 326 | |
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| 327 | /// Copy constructor. |
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| 328 | /// |
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| 329 | Edge(const Edge& e) : UEdge(e) { } |
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| 330 | /// Initialize the iterator to be invalid. |
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| 331 | |
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| 332 | /// Initialize the iterator to be invalid. |
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| 333 | /// |
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| 334 | Edge(Invalid) { } |
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| 335 | /// Equality operator |
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| 336 | |
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| 337 | /// Two iterators are equal if and only if they point to the |
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| 338 | /// same object or both are invalid. |
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| 339 | bool operator==(Edge) const { return true; } |
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| 340 | /// Inequality operator |
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| 341 | |
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| 342 | /// \sa operator==(Edge n) |
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| 343 | /// |
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| 344 | bool operator!=(Edge) const { return true; } |
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| 345 | |
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| 346 | /// Artificial ordering operator. |
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| 347 | |
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| 348 | /// To allow the use of graph descriptors as key type in std::map or |
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| 349 | /// similar associative container we require this. |
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| 350 | /// |
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| 351 | /// \note This operator only have to define some strict ordering of |
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| 352 | /// the items; this order has nothing to do with the iteration |
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| 353 | /// ordering of the items. |
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| 354 | bool operator<(Edge) const { return false; } |
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| 355 | |
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| 356 | }; |
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| 357 | /// This iterator goes through each directed edge. |
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| 358 | |
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| 359 | /// This iterator goes through each edge of a graph. |
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| 360 | /// Its usage is quite simple, for example you can count the number |
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| 361 | /// of edges in a graph \c g of type \c Graph as follows: |
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| 362 | ///\code |
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| 363 | /// int count=0; |
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| 364 | /// for(Graph::EdgeIt e(g); e!=INVALID; ++e) ++count; |
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| 365 | ///\endcode |
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| 366 | class EdgeIt : public Edge { |
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| 367 | public: |
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| 368 | /// Default constructor |
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| 369 | |
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| 370 | /// @warning The default constructor sets the iterator |
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| 371 | /// to an undefined value. |
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| 372 | EdgeIt() { } |
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| 373 | /// Copy constructor. |
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| 374 | |
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| 375 | /// Copy constructor. |
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| 376 | /// |
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| 377 | EdgeIt(const EdgeIt& e) : Edge(e) { } |
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| 378 | /// Initialize the iterator to be invalid. |
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| 379 | |
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| 380 | /// Initialize the iterator to be invalid. |
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| 381 | /// |
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| 382 | EdgeIt(Invalid) { } |
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| 383 | /// This constructor sets the iterator to the first edge. |
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| 384 | |
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| 385 | /// This constructor sets the iterator to the first edge of \c g. |
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| 386 | ///@param g the graph |
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| 387 | EdgeIt(const UGraph &g) { ignore_unused_variable_warning(g); } |
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| 388 | /// Edge -> EdgeIt conversion |
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| 389 | |
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| 390 | /// Sets the iterator to the value of the trivial iterator \c e. |
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| 391 | /// This feature necessitates that each time we |
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| 392 | /// iterate the edge-set, the iteration order is the same. |
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| 393 | EdgeIt(const UGraph&, const Edge&) { } |
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| 394 | ///Next edge |
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| 395 | |
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| 396 | /// Assign the iterator to the next edge. |
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| 397 | EdgeIt& operator++() { return *this; } |
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| 398 | }; |
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| 399 | |
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| 400 | /// This iterator goes trough the outgoing directed edges of a node. |
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| 401 | |
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| 402 | /// This iterator goes trough the \e outgoing edges of a certain node |
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| 403 | /// of a graph. |
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| 404 | /// Its usage is quite simple, for example you can count the number |
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| 405 | /// of outgoing edges of a node \c n |
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| 406 | /// in graph \c g of type \c Graph as follows. |
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| 407 | ///\code |
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| 408 | /// int count=0; |
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| 409 | /// for (Graph::OutEdgeIt e(g, n); e!=INVALID; ++e) ++count; |
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| 410 | ///\endcode |
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| 411 | |
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| 412 | class OutEdgeIt : public Edge { |
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| 413 | public: |
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| 414 | /// Default constructor |
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| 415 | |
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| 416 | /// @warning The default constructor sets the iterator |
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| 417 | /// to an undefined value. |
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| 418 | OutEdgeIt() { } |
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| 419 | /// Copy constructor. |
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| 420 | |
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| 421 | /// Copy constructor. |
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| 422 | /// |
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| 423 | OutEdgeIt(const OutEdgeIt& e) : Edge(e) { } |
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| 424 | /// Initialize the iterator to be invalid. |
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| 425 | |
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| 426 | /// Initialize the iterator to be invalid. |
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| 427 | /// |
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| 428 | OutEdgeIt(Invalid) { } |
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| 429 | /// This constructor sets the iterator to the first outgoing edge. |
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| 430 | |
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| 431 | /// This constructor sets the iterator to the first outgoing edge of |
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| 432 | /// the node. |
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| 433 | ///@param n the node |
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| 434 | ///@param g the graph |
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| 435 | OutEdgeIt(const UGraph& n, const Node& g) { |
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| 436 | ignore_unused_variable_warning(n); |
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| 437 | ignore_unused_variable_warning(g); |
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| 438 | } |
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| 439 | /// Edge -> OutEdgeIt conversion |
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| 440 | |
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| 441 | /// Sets the iterator to the value of the trivial iterator. |
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| 442 | /// This feature necessitates that each time we |
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| 443 | /// iterate the edge-set, the iteration order is the same. |
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| 444 | OutEdgeIt(const UGraph&, const Edge&) { } |
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| 445 | ///Next outgoing edge |
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| 446 | |
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| 447 | /// Assign the iterator to the next |
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| 448 | /// outgoing edge of the corresponding node. |
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| 449 | OutEdgeIt& operator++() { return *this; } |
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| 450 | }; |
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| 451 | |
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| 452 | /// This iterator goes trough the incoming directed edges of a node. |
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| 453 | |
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| 454 | /// This iterator goes trough the \e incoming edges of a certain node |
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| 455 | /// of a graph. |
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| 456 | /// Its usage is quite simple, for example you can count the number |
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| 457 | /// of outgoing edges of a node \c n |
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| 458 | /// in graph \c g of type \c Graph as follows. |
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| 459 | ///\code |
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| 460 | /// int count=0; |
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| 461 | /// for(Graph::InEdgeIt e(g, n); e!=INVALID; ++e) ++count; |
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| 462 | ///\endcode |
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| 463 | |
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| 464 | class InEdgeIt : public Edge { |
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| 465 | public: |
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| 466 | /// Default constructor |
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| 467 | |
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| 468 | /// @warning The default constructor sets the iterator |
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| 469 | /// to an undefined value. |
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| 470 | InEdgeIt() { } |
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| 471 | /// Copy constructor. |
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| 472 | |
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| 473 | /// Copy constructor. |
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| 474 | /// |
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| 475 | InEdgeIt(const InEdgeIt& e) : Edge(e) { } |
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| 476 | /// Initialize the iterator to be invalid. |
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| 477 | |
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| 478 | /// Initialize the iterator to be invalid. |
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| 479 | /// |
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| 480 | InEdgeIt(Invalid) { } |
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| 481 | /// This constructor sets the iterator to first incoming edge. |
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| 482 | |
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| 483 | /// This constructor set the iterator to the first incoming edge of |
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| 484 | /// the node. |
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| 485 | ///@param n the node |
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| 486 | ///@param g the graph |
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| 487 | InEdgeIt(const UGraph& g, const Node& n) { |
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| 488 | ignore_unused_variable_warning(n); |
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| 489 | ignore_unused_variable_warning(g); |
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| 490 | } |
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| 491 | /// Edge -> InEdgeIt conversion |
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| 492 | |
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| 493 | /// Sets the iterator to the value of the trivial iterator \c e. |
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| 494 | /// This feature necessitates that each time we |
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| 495 | /// iterate the edge-set, the iteration order is the same. |
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| 496 | InEdgeIt(const UGraph&, const Edge&) { } |
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| 497 | /// Next incoming edge |
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| 498 | |
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| 499 | /// Assign the iterator to the next inedge of the corresponding node. |
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| 500 | /// |
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| 501 | InEdgeIt& operator++() { return *this; } |
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| 502 | }; |
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| 503 | |
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| 504 | /// \brief Read write map of the nodes to type \c T. |
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| 505 | /// |
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| 506 | /// ReadWrite map of the nodes to type \c T. |
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| 507 | /// \sa Reference |
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| 508 | template<class T> |
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| 509 | class NodeMap : public ReadWriteMap< Node, T > |
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| 510 | { |
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| 511 | public: |
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| 512 | |
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| 513 | ///\e |
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| 514 | NodeMap(const UGraph&) { } |
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| 515 | ///\e |
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| 516 | NodeMap(const UGraph&, T) { } |
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| 517 | |
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| 518 | ///Copy constructor |
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| 519 | NodeMap(const NodeMap& nm) : ReadWriteMap< Node, T >(nm) { } |
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| 520 | ///Assignment operator |
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| 521 | template <typename CMap> |
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| 522 | NodeMap& operator=(const CMap&) { |
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| 523 | checkConcept<ReadMap<Node, T>, CMap>(); |
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| 524 | return *this; |
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| 525 | } |
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| 526 | }; |
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| 527 | |
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| 528 | /// \brief Read write map of the directed edges to type \c T. |
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| 529 | /// |
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| 530 | /// Reference map of the directed edges to type \c T. |
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| 531 | /// \sa Reference |
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| 532 | template<class T> |
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| 533 | class EdgeMap : public ReadWriteMap<Edge,T> |
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| 534 | { |
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| 535 | public: |
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| 536 | |
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| 537 | ///\e |
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| 538 | EdgeMap(const UGraph&) { } |
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| 539 | ///\e |
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| 540 | EdgeMap(const UGraph&, T) { } |
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| 541 | ///Copy constructor |
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| 542 | EdgeMap(const EdgeMap& em) : ReadWriteMap<Edge,T>(em) { } |
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| 543 | ///Assignment operator |
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| 544 | template <typename CMap> |
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| 545 | EdgeMap& operator=(const CMap&) { |
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| 546 | checkConcept<ReadMap<Edge, T>, CMap>(); |
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| 547 | return *this; |
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| 548 | } |
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| 549 | }; |
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| 550 | |
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| 551 | /// Read write map of the undirected edges to type \c T. |
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| 552 | |
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| 553 | /// Reference map of the edges to type \c T. |
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| 554 | /// \sa Reference |
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| 555 | template<class T> |
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| 556 | class UEdgeMap : public ReadWriteMap<UEdge,T> |
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| 557 | { |
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| 558 | public: |
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| 559 | |
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| 560 | ///\e |
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| 561 | UEdgeMap(const UGraph&) { } |
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| 562 | ///\e |
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| 563 | UEdgeMap(const UGraph&, T) { } |
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| 564 | ///Copy constructor |
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| 565 | UEdgeMap(const UEdgeMap& em) : ReadWriteMap<UEdge,T>(em) {} |
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| 566 | ///Assignment operator |
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| 567 | template <typename CMap> |
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| 568 | UEdgeMap& operator=(const CMap&) { |
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| 569 | checkConcept<ReadMap<UEdge, T>, CMap>(); |
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| 570 | return *this; |
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| 571 | } |
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| 572 | }; |
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| 573 | |
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| 574 | /// \brief Direct the given undirected edge. |
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| 575 | /// |
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| 576 | /// Direct the given undirected edge. The returned edge source |
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| 577 | /// will be the given node. |
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| 578 | Edge direct(const UEdge&, const Node&) const { |
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| 579 | return INVALID; |
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| 580 | } |
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| 581 | |
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| 582 | /// \brief Direct the given undirected edge. |
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| 583 | /// |
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| 584 | /// Direct the given undirected edge. The returned edge |
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[2291] | 585 | /// represents the given undirected edge and the direction comes |
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[2260] | 586 | /// from the given bool. The source of the undirected edge and |
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| 587 | /// the directed edge is the same when the given bool is true. |
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| 588 | Edge direct(const UEdge&, bool) const { |
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| 589 | return INVALID; |
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| 590 | } |
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| 591 | |
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| 592 | /// \brief Returns true if the edge has default orientation. |
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| 593 | /// |
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| 594 | /// Returns whether the given directed edge is same orientation as |
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| 595 | /// the corresponding undirected edge's default orientation. |
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| 596 | bool direction(Edge) const { return true; } |
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| 597 | |
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| 598 | /// \brief Returns the opposite directed edge. |
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| 599 | /// |
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| 600 | /// Returns the opposite directed edge. |
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| 601 | Edge oppositeEdge(Edge) const { return INVALID; } |
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| 602 | |
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| 603 | /// \brief Opposite node on an edge |
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| 604 | /// |
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| 605 | /// \return the opposite of the given Node on the given UEdge |
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| 606 | Node oppositeNode(Node, UEdge) const { return INVALID; } |
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| 607 | |
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| 608 | /// \brief First node of the undirected edge. |
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| 609 | /// |
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| 610 | /// \return the first node of the given UEdge. |
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| 611 | /// |
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| 612 | /// Naturally undirected edges don't have direction and thus |
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| 613 | /// don't have source and target node. But we use these two methods |
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| 614 | /// to query the two nodes of the edge. The direction of the edge |
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| 615 | /// which arises this way is called the inherent direction of the |
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| 616 | /// undirected edge, and is used to define the "default" direction |
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| 617 | /// of the directed versions of the edges. |
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| 618 | /// \sa direction |
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| 619 | Node source(UEdge) const { return INVALID; } |
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| 620 | |
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| 621 | /// \brief Second node of the undirected edge. |
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| 622 | Node target(UEdge) const { return INVALID; } |
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| 623 | |
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| 624 | /// \brief Source node of the directed edge. |
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| 625 | Node source(Edge) const { return INVALID; } |
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| 626 | |
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| 627 | /// \brief Target node of the directed edge. |
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| 628 | Node target(Edge) const { return INVALID; } |
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| 629 | |
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| 630 | void first(Node&) const {} |
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| 631 | void next(Node&) const {} |
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| 632 | |
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| 633 | void first(UEdge&) const {} |
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| 634 | void next(UEdge&) const {} |
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| 635 | |
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| 636 | void first(Edge&) const {} |
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| 637 | void next(Edge&) const {} |
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| 638 | |
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| 639 | void firstOut(Edge&, Node) const {} |
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| 640 | void nextOut(Edge&) const {} |
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| 641 | |
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| 642 | void firstIn(Edge&, Node) const {} |
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| 643 | void nextIn(Edge&) const {} |
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| 644 | |
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| 645 | |
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| 646 | void firstInc(UEdge &, bool &, const Node &) const {} |
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| 647 | void nextInc(UEdge &, bool &) const {} |
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| 648 | |
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| 649 | /// \brief Base node of the iterator |
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| 650 | /// |
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| 651 | /// Returns the base node (the source in this case) of the iterator |
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| 652 | Node baseNode(OutEdgeIt e) const { |
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| 653 | return source(e); |
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| 654 | } |
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| 655 | /// \brief Running node of the iterator |
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| 656 | /// |
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| 657 | /// Returns the running node (the target in this case) of the |
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| 658 | /// iterator |
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| 659 | Node runningNode(OutEdgeIt e) const { |
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| 660 | return target(e); |
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| 661 | } |
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| 662 | |
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| 663 | /// \brief Base node of the iterator |
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| 664 | /// |
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| 665 | /// Returns the base node (the target in this case) of the iterator |
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| 666 | Node baseNode(InEdgeIt e) const { |
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| 667 | return target(e); |
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| 668 | } |
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| 669 | /// \brief Running node of the iterator |
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| 670 | /// |
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| 671 | /// Returns the running node (the source in this case) of the |
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| 672 | /// iterator |
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| 673 | Node runningNode(InEdgeIt e) const { |
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| 674 | return source(e); |
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| 675 | } |
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| 676 | |
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| 677 | /// \brief Base node of the iterator |
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| 678 | /// |
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| 679 | /// Returns the base node of the iterator |
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| 680 | Node baseNode(IncEdgeIt) const { |
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| 681 | return INVALID; |
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| 682 | } |
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| 683 | |
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| 684 | /// \brief Running node of the iterator |
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| 685 | /// |
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| 686 | /// Returns the running node of the iterator |
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| 687 | Node runningNode(IncEdgeIt) const { |
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| 688 | return INVALID; |
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| 689 | } |
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| 690 | |
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| 691 | template <typename Graph> |
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| 692 | struct Constraints { |
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| 693 | void constraints() { |
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| 694 | checkConcept<IterableUGraphComponent<>, Graph>(); |
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| 695 | checkConcept<MappableUGraphComponent<>, Graph>(); |
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| 696 | } |
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| 697 | }; |
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| 698 | |
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| 699 | }; |
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| 700 | |
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| 701 | /// @} |
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| 702 | |
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| 703 | } |
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| 704 | |
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| 705 | } |
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| 706 | |
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| 707 | #endif |
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