[906] | 1 | /* -*- C++ -*- |
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[921] | 2 | * src/lemon/full_graph.h - Part of LEMON, a generic C++ optimization library |
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[906] | 3 | * |
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| 4 | * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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| 5 | * (Egervary Combinatorial Optimization Research Group, EGRES). |
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| 6 | * |
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| 7 | * Permission to use, modify and distribute this software is granted |
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| 8 | * provided that this copyright notice appears in all copies. For |
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| 9 | * precise terms see the accompanying LICENSE file. |
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| 10 | * |
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| 11 | * This software is provided "AS IS" with no warranty of any kind, |
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| 12 | * express or implied, and with no claim as to its suitability for any |
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| 13 | * purpose. |
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| 14 | * |
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| 15 | */ |
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[591] | 16 | |
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[921] | 17 | #ifndef LEMON_FULL_GRAPH_H |
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| 18 | #define LEMON_FULL_GRAPH_H |
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[591] | 19 | |
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[946] | 20 | |
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| 21 | #include <lemon/idmappable_graph_extender.h> |
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| 22 | |
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| 23 | #include <lemon/iterable_graph_extender.h> |
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| 24 | |
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| 25 | #include <lemon/alteration_observer_registry.h> |
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| 26 | #include <lemon/default_map.h> |
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| 27 | |
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[591] | 28 | ///\ingroup graphs |
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| 29 | ///\file |
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| 30 | ///\brief FullGraph and SymFullGraph classes. |
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| 31 | |
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| 32 | |
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[921] | 33 | #include <lemon/invalid.h> |
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[591] | 34 | |
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[921] | 35 | namespace lemon { |
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[591] | 36 | |
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| 37 | /// \addtogroup graphs |
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| 38 | /// @{ |
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| 39 | |
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| 40 | ///A full graph class. |
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| 41 | |
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| 42 | ///This is a simple and fast directed full graph implementation. |
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[606] | 43 | ///It is completely static, so you can neither add nor delete either |
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[591] | 44 | ///edges or nodes. |
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[880] | 45 | ///Thus it conforms to |
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| 46 | ///the \ref skeleton::StaticGraph "StaticGraph" concept |
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| 47 | ///\sa skeleton::StaticGraph. |
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[752] | 48 | ///\todo What about loops? |
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| 49 | ///\todo Don't we need SymEdgeMap? |
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[591] | 50 | /// |
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| 51 | ///\author Alpar Juttner |
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[946] | 52 | class FullGraphBase { |
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[591] | 53 | int NodeNum; |
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| 54 | int EdgeNum; |
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| 55 | public: |
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[782] | 56 | |
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[946] | 57 | typedef FullGraphBase Graph; |
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[591] | 58 | |
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| 59 | class Node; |
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| 60 | class Edge; |
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[782] | 61 | |
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[591] | 62 | public: |
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| 63 | |
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[946] | 64 | FullGraphBase() {} |
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| 65 | |
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| 66 | |
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[591] | 67 | ///Creates a full graph with \c n nodes. |
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[946] | 68 | void construct(int n) { NodeNum = n; EdgeNum = n * n; } |
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[591] | 69 | /// |
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[946] | 70 | // FullGraphBase(const FullGraphBase &_g) |
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| 71 | // : NodeNum(_g.nodeNum()), EdgeNum(NodeNum*NodeNum) { } |
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[591] | 72 | |
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[813] | 73 | ///Number of nodes. |
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| 74 | int nodeNum() const { return NodeNum; } |
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| 75 | ///Number of edges. |
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| 76 | int edgeNum() const { return EdgeNum; } |
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[591] | 77 | |
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[813] | 78 | /// Maximum node ID. |
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| 79 | |
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| 80 | /// Maximum node ID. |
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| 81 | ///\sa id(Node) |
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| 82 | int maxNodeId() const { return NodeNum-1; } |
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| 83 | /// Maximum edge ID. |
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| 84 | |
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| 85 | /// Maximum edge ID. |
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| 86 | ///\sa id(Edge) |
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| 87 | int maxEdgeId() const { return EdgeNum-1; } |
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[591] | 88 | |
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[946] | 89 | Node tail(Edge e) const { return e.id % NodeNum; } |
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| 90 | Node head(Edge e) const { return e.id / NodeNum; } |
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[591] | 91 | |
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| 92 | |
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[813] | 93 | /// Node ID. |
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| 94 | |
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| 95 | /// The ID of a valid Node is a nonnegative integer not greater than |
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| 96 | /// \ref maxNodeId(). The range of the ID's is not surely continuous |
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| 97 | /// and the greatest node ID can be actually less then \ref maxNodeId(). |
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| 98 | /// |
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| 99 | /// The ID of the \ref INVALID node is -1. |
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| 100 | ///\return The ID of the node \c v. |
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[946] | 101 | |
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| 102 | static int id(Node v) { return v.id; } |
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[813] | 103 | /// Edge ID. |
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| 104 | |
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| 105 | /// The ID of a valid Edge is a nonnegative integer not greater than |
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| 106 | /// \ref maxEdgeId(). The range of the ID's is not surely continuous |
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| 107 | /// and the greatest edge ID can be actually less then \ref maxEdgeId(). |
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| 108 | /// |
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| 109 | /// The ID of the \ref INVALID edge is -1. |
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| 110 | ///\return The ID of the edge \c e. |
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[946] | 111 | static int id(Edge e) { return e.id; } |
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[591] | 112 | |
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[774] | 113 | /// Finds an edge between two nodes. |
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| 114 | |
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| 115 | /// Finds an edge from node \c u to node \c v. |
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| 116 | /// |
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| 117 | /// If \c prev is \ref INVALID (this is the default value), then |
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| 118 | /// It finds the first edge from \c u to \c v. Otherwise it looks for |
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| 119 | /// the next edge from \c u to \c v after \c prev. |
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| 120 | /// \return The found edge or INVALID if there is no such an edge. |
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| 121 | Edge findEdge(Node u,Node v, Edge prev = INVALID) |
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| 122 | { |
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[946] | 123 | return prev.id == -1 ? Edge(*this, u.id, v.id) : INVALID; |
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[774] | 124 | } |
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| 125 | |
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| 126 | |
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[591] | 127 | class Node { |
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[946] | 128 | friend class FullGraphBase; |
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[591] | 129 | |
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| 130 | protected: |
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[946] | 131 | int id; |
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| 132 | Node(int _id) { id = _id;} |
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[591] | 133 | public: |
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| 134 | Node() {} |
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[946] | 135 | Node (Invalid) { id = -1; } |
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| 136 | bool operator==(const Node node) const {return id == node.id;} |
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| 137 | bool operator!=(const Node node) const {return id != node.id;} |
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| 138 | bool operator<(const Node node) const {return id < node.id;} |
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[591] | 139 | }; |
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| 140 | |
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[946] | 141 | |
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| 142 | |
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| 143 | class Edge { |
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| 144 | friend class FullGraphBase; |
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| 145 | |
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| 146 | protected: |
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| 147 | int id; // NodeNum * head + tail; |
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| 148 | |
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| 149 | Edge(int _id) : id(_id) {} |
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| 150 | |
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| 151 | Edge(const FullGraphBase& _graph, int tail, int head) |
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| 152 | : id(_graph.NodeNum * head+tail) {} |
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[591] | 153 | public: |
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[946] | 154 | Edge() { } |
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| 155 | Edge (Invalid) { id = -1; } |
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| 156 | bool operator==(const Edge edge) const {return id == edge.id;} |
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| 157 | bool operator!=(const Edge edge) const {return id != edge.id;} |
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| 158 | bool operator<(const Edge edge) const {return id < edge.id;} |
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[591] | 159 | }; |
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| 160 | |
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[946] | 161 | void first(Node& node) const { |
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| 162 | node.id = NodeNum-1; |
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| 163 | } |
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[591] | 164 | |
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[946] | 165 | static void next(Node& node) { |
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| 166 | --node.id; |
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| 167 | } |
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| 168 | |
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| 169 | void first(Edge& edge) const { |
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| 170 | edge.id = EdgeNum-1; |
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| 171 | } |
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| 172 | |
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| 173 | static void next(Edge& edge) { |
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| 174 | --edge.id; |
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| 175 | } |
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| 176 | |
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| 177 | void firstOut(Edge& edge, const Node& node) const { |
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| 178 | edge.id = EdgeNum + node.id - NodeNum; |
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| 179 | } |
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| 180 | |
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| 181 | void nextOut(Edge& edge) const { |
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| 182 | edge.id -= NodeNum; |
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| 183 | if (edge.id < 0) edge.id = -1; |
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| 184 | } |
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| 185 | |
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| 186 | void firstIn(Edge& edge, const Node& node) const { |
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| 187 | edge.id = node.id * NodeNum; |
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| 188 | } |
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[591] | 189 | |
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[946] | 190 | void nextIn(Edge& edge) const { |
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| 191 | ++edge.id; |
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| 192 | if (edge.id % NodeNum == 0) edge.id = -1; |
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| 193 | } |
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[591] | 194 | |
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| 195 | }; |
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| 196 | |
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[946] | 197 | |
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| 198 | typedef AlterableGraphExtender<FullGraphBase> AlterableFullGraphBase; |
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| 199 | typedef IterableGraphExtender<AlterableFullGraphBase> IterableFullGraphBase; |
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| 200 | typedef IdMappableGraphExtender<IterableFullGraphBase> IdMappableFullGraphBase; |
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| 201 | typedef DefaultMappableGraphExtender<IdMappableFullGraphBase> MappableFullGraphBase; |
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| 202 | |
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| 203 | class FullGraph : public MappableFullGraphBase { |
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| 204 | public: |
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| 205 | |
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| 206 | FullGraph(int n) { construct(n); } |
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| 207 | }; |
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| 208 | |
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| 209 | template <> |
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| 210 | int countNodes<FullGraph>(const FullGraph& graph) { |
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| 211 | return graph.nodeNum(); |
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| 212 | } |
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| 213 | |
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| 214 | template <> |
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| 215 | int countEdges<FullGraph>(const FullGraph& graph) { |
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| 216 | return graph.edgeNum(); |
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| 217 | } |
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| 218 | |
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[591] | 219 | /// @} |
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| 220 | |
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[921] | 221 | } //namespace lemon |
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[591] | 222 | |
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| 223 | |
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| 224 | |
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| 225 | |
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[921] | 226 | #endif //LEMON_FULL_GRAPH_H |
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