[906] | 1 | /* -*- C++ -*- |
---|
[1435] | 2 | * lemon/smart_graph.h - Part of LEMON, a generic C++ optimization library |
---|
[906] | 3 | * |
---|
[1164] | 4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
---|
[1359] | 5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
---|
[906] | 6 | * |
---|
| 7 | * Permission to use, modify and distribute this software is granted |
---|
| 8 | * provided that this copyright notice appears in all copies. For |
---|
| 9 | * precise terms see the accompanying LICENSE file. |
---|
| 10 | * |
---|
| 11 | * This software is provided "AS IS" with no warranty of any kind, |
---|
| 12 | * express or implied, and with no claim as to its suitability for any |
---|
| 13 | * purpose. |
---|
| 14 | * |
---|
| 15 | */ |
---|
[105] | 16 | |
---|
[921] | 17 | #ifndef LEMON_SMART_GRAPH_H |
---|
| 18 | #define LEMON_SMART_GRAPH_H |
---|
[104] | 19 | |
---|
[491] | 20 | ///\ingroup graphs |
---|
[242] | 21 | ///\file |
---|
[1692] | 22 | ///\brief SmartGraph and UndirSmartGraph classes. |
---|
[242] | 23 | |
---|
[104] | 24 | #include <vector> |
---|
| 25 | |
---|
[921] | 26 | #include <lemon/invalid.h> |
---|
[157] | 27 | |
---|
[1307] | 28 | #include <lemon/bits/clearable_graph_extender.h> |
---|
| 29 | #include <lemon/bits/extendable_graph_extender.h> |
---|
| 30 | #include <lemon/bits/iterable_graph_extender.h> |
---|
| 31 | #include <lemon/bits/alteration_notifier.h> |
---|
| 32 | #include <lemon/bits/default_map.h> |
---|
[1791] | 33 | #include <lemon/bits/graph_extender.h> |
---|
[1034] | 34 | |
---|
[977] | 35 | #include <lemon/utility.h> |
---|
[782] | 36 | |
---|
[921] | 37 | namespace lemon { |
---|
[104] | 38 | |
---|
[973] | 39 | class SmartGraph; |
---|
[969] | 40 | ///Base of SmartGraph |
---|
| 41 | |
---|
| 42 | ///Base of SmartGraph |
---|
| 43 | /// |
---|
[946] | 44 | class SmartGraphBase { |
---|
[104] | 45 | |
---|
[973] | 46 | friend class SmatGraph; |
---|
| 47 | |
---|
| 48 | protected: |
---|
[104] | 49 | struct NodeT |
---|
| 50 | { |
---|
| 51 | int first_in,first_out; |
---|
[157] | 52 | NodeT() : first_in(-1), first_out(-1) {} |
---|
[104] | 53 | }; |
---|
| 54 | struct EdgeT |
---|
| 55 | { |
---|
[986] | 56 | int target, source, next_in, next_out; |
---|
[104] | 57 | //FIXME: is this necessary? |
---|
[157] | 58 | EdgeT() : next_in(-1), next_out(-1) {} |
---|
[104] | 59 | }; |
---|
| 60 | |
---|
| 61 | std::vector<NodeT> nodes; |
---|
[129] | 62 | |
---|
[104] | 63 | std::vector<EdgeT> edges; |
---|
| 64 | |
---|
[185] | 65 | |
---|
[104] | 66 | public: |
---|
[782] | 67 | |
---|
[946] | 68 | typedef SmartGraphBase Graph; |
---|
[104] | 69 | |
---|
[164] | 70 | class Node; |
---|
| 71 | class Edge; |
---|
[108] | 72 | |
---|
[104] | 73 | |
---|
| 74 | public: |
---|
| 75 | |
---|
[946] | 76 | SmartGraphBase() : nodes(), edges() { } |
---|
[1718] | 77 | SmartGraphBase(const SmartGraphBase &_g) |
---|
| 78 | : nodes(_g.nodes), edges(_g.edges) { } |
---|
[104] | 79 | |
---|
[977] | 80 | typedef True NodeNumTag; |
---|
| 81 | typedef True EdgeNumTag; |
---|
| 82 | |
---|
[813] | 83 | ///Number of nodes. |
---|
| 84 | int nodeNum() const { return nodes.size(); } |
---|
| 85 | ///Number of edges. |
---|
| 86 | int edgeNum() const { return edges.size(); } |
---|
[104] | 87 | |
---|
[813] | 88 | /// Maximum node ID. |
---|
| 89 | |
---|
| 90 | /// Maximum node ID. |
---|
| 91 | ///\sa id(Node) |
---|
[1791] | 92 | int maxNodeId() const { return nodes.size()-1; } |
---|
[813] | 93 | /// Maximum edge ID. |
---|
| 94 | |
---|
| 95 | /// Maximum edge ID. |
---|
| 96 | ///\sa id(Edge) |
---|
[1791] | 97 | int maxEdgeId() const { return edges.size()-1; } |
---|
[108] | 98 | |
---|
[986] | 99 | Node source(Edge e) const { return edges[e.n].source; } |
---|
| 100 | Node target(Edge e) const { return edges[e.n].target; } |
---|
[104] | 101 | |
---|
[813] | 102 | /// Node ID. |
---|
| 103 | |
---|
| 104 | /// The ID of a valid Node is a nonnegative integer not greater than |
---|
[1791] | 105 | /// \ref maxNodeId(). The range of the ID's is not surely continuous |
---|
| 106 | /// and the greatest node ID can be actually less then \ref maxNodeId(). |
---|
[813] | 107 | /// |
---|
| 108 | /// The ID of the \ref INVALID node is -1. |
---|
| 109 | ///\return The ID of the node \c v. |
---|
[713] | 110 | static int id(Node v) { return v.n; } |
---|
[813] | 111 | /// Edge ID. |
---|
| 112 | |
---|
| 113 | /// The ID of a valid Edge is a nonnegative integer not greater than |
---|
[1791] | 114 | /// \ref maxEdgeId(). The range of the ID's is not surely continuous |
---|
| 115 | /// and the greatest edge ID can be actually less then \ref maxEdgeId(). |
---|
[813] | 116 | /// |
---|
| 117 | /// The ID of the \ref INVALID edge is -1. |
---|
| 118 | ///\return The ID of the edge \c e. |
---|
[713] | 119 | static int id(Edge e) { return e.n; } |
---|
[104] | 120 | |
---|
[1791] | 121 | static Node nodeFromId(int id) { return Node(id);} |
---|
[1106] | 122 | |
---|
[1791] | 123 | static Edge edgeFromId(int id) { return Edge(id);} |
---|
[1106] | 124 | |
---|
[164] | 125 | Node addNode() { |
---|
| 126 | Node n; n.n=nodes.size(); |
---|
[104] | 127 | nodes.push_back(NodeT()); //FIXME: Hmmm... |
---|
| 128 | return n; |
---|
| 129 | } |
---|
[108] | 130 | |
---|
[164] | 131 | Edge addEdge(Node u, Node v) { |
---|
| 132 | Edge e; e.n=edges.size(); edges.push_back(EdgeT()); //FIXME: Hmmm... |
---|
[986] | 133 | edges[e.n].source=u.n; edges[e.n].target=v.n; |
---|
[104] | 134 | edges[e.n].next_out=nodes[u.n].first_out; |
---|
| 135 | edges[e.n].next_in=nodes[v.n].first_in; |
---|
| 136 | nodes[u.n].first_out=nodes[v.n].first_in=e.n; |
---|
[108] | 137 | |
---|
[104] | 138 | return e; |
---|
| 139 | } |
---|
| 140 | |
---|
[782] | 141 | void clear() { |
---|
| 142 | edges.clear(); |
---|
| 143 | nodes.clear(); |
---|
| 144 | } |
---|
[104] | 145 | |
---|
[946] | 146 | |
---|
[164] | 147 | class Node { |
---|
[946] | 148 | friend class SmartGraphBase; |
---|
[973] | 149 | friend class SmartGraph; |
---|
[104] | 150 | |
---|
| 151 | protected: |
---|
| 152 | int n; |
---|
[164] | 153 | Node(int nn) {n=nn;} |
---|
[104] | 154 | public: |
---|
[164] | 155 | Node() {} |
---|
[503] | 156 | Node (Invalid) { n=-1; } |
---|
[164] | 157 | bool operator==(const Node i) const {return n==i.n;} |
---|
| 158 | bool operator!=(const Node i) const {return n!=i.n;} |
---|
| 159 | bool operator<(const Node i) const {return n<i.n;} |
---|
[104] | 160 | }; |
---|
| 161 | |
---|
| 162 | |
---|
[164] | 163 | class Edge { |
---|
[946] | 164 | friend class SmartGraphBase; |
---|
[973] | 165 | friend class SmartGraph; |
---|
[185] | 166 | |
---|
[104] | 167 | protected: |
---|
| 168 | int n; |
---|
[905] | 169 | Edge(int nn) {n=nn;} |
---|
[706] | 170 | public: |
---|
[164] | 171 | Edge() { } |
---|
[174] | 172 | Edge (Invalid) { n=-1; } |
---|
[164] | 173 | bool operator==(const Edge i) const {return n==i.n;} |
---|
| 174 | bool operator!=(const Edge i) const {return n!=i.n;} |
---|
| 175 | bool operator<(const Edge i) const {return n<i.n;} |
---|
[946] | 176 | }; |
---|
[905] | 177 | |
---|
[946] | 178 | void first(Node& node) const { |
---|
| 179 | node.n = nodes.size() - 1; |
---|
| 180 | } |
---|
| 181 | |
---|
| 182 | static void next(Node& node) { |
---|
| 183 | --node.n; |
---|
| 184 | } |
---|
| 185 | |
---|
| 186 | void first(Edge& edge) const { |
---|
| 187 | edge.n = edges.size() - 1; |
---|
| 188 | } |
---|
| 189 | |
---|
| 190 | static void next(Edge& edge) { |
---|
| 191 | --edge.n; |
---|
| 192 | } |
---|
| 193 | |
---|
| 194 | void firstOut(Edge& edge, const Node& node) const { |
---|
| 195 | edge.n = nodes[node.n].first_out; |
---|
| 196 | } |
---|
| 197 | |
---|
| 198 | void nextOut(Edge& edge) const { |
---|
| 199 | edge.n = edges[edge.n].next_out; |
---|
| 200 | } |
---|
| 201 | |
---|
| 202 | void firstIn(Edge& edge, const Node& node) const { |
---|
| 203 | edge.n = nodes[node.n].first_in; |
---|
| 204 | } |
---|
[104] | 205 | |
---|
[946] | 206 | void nextIn(Edge& edge) const { |
---|
| 207 | edge.n = edges[edge.n].next_in; |
---|
| 208 | } |
---|
[105] | 209 | |
---|
[1284] | 210 | Node _split(Node n, bool connect = true) |
---|
| 211 | { |
---|
| 212 | Node b = addNode(); |
---|
| 213 | nodes[b.n].first_out=nodes[n.n].first_out; |
---|
| 214 | nodes[n.n].first_out=-1; |
---|
| 215 | for(int i=nodes[b.n].first_out;i!=-1;i++) edges[i].source=b.n; |
---|
| 216 | if(connect) addEdge(n,b); |
---|
| 217 | return b; |
---|
| 218 | } |
---|
| 219 | |
---|
[104] | 220 | }; |
---|
[185] | 221 | |
---|
[1669] | 222 | typedef ClearableGraphExtender< |
---|
| 223 | ExtendableGraphExtender< |
---|
| 224 | MappableGraphExtender< |
---|
| 225 | IterableGraphExtender< |
---|
[1791] | 226 | AlterableGraphExtender< |
---|
| 227 | GraphExtender<SmartGraphBase> > > > > > ExtendedSmartGraphBase; |
---|
[937] | 228 | |
---|
[1791] | 229 | /// \ingroup graphs |
---|
[1161] | 230 | |
---|
[950] | 231 | ///A smart graph class. |
---|
[937] | 232 | |
---|
[950] | 233 | ///This is a simple and fast graph implementation. |
---|
| 234 | ///It is also quite memory efficient, but at the price |
---|
[974] | 235 | ///that <b> it does support only limited (only stack-like) |
---|
| 236 | ///node and edge deletions</b>. |
---|
[950] | 237 | ///It conforms to |
---|
[959] | 238 | ///the \ref concept::ExtendableGraph "ExtendableGraph" concept. |
---|
| 239 | ///\sa concept::ExtendableGraph. |
---|
[950] | 240 | /// |
---|
| 241 | ///\author Alpar Juttner |
---|
[1669] | 242 | class SmartGraph : public ExtendedSmartGraphBase { |
---|
[969] | 243 | public: |
---|
[973] | 244 | |
---|
[1770] | 245 | class Snapshot; |
---|
| 246 | friend class Snapshot; |
---|
[973] | 247 | |
---|
[1011] | 248 | protected: |
---|
[1770] | 249 | void restoreSnapshot(const Snapshot &s) |
---|
[973] | 250 | { |
---|
[1457] | 251 | while(s.edge_num<edges.size()) { |
---|
[1040] | 252 | Parent::getNotifier(Edge()).erase(Edge(edges.size()-1)); |
---|
[986] | 253 | nodes[edges.back().target].first_in=edges.back().next_in; |
---|
| 254 | nodes[edges.back().source].first_out=edges.back().next_out; |
---|
[973] | 255 | edges.pop_back(); |
---|
| 256 | } |
---|
| 257 | //nodes.resize(s.nodes_num); |
---|
[1457] | 258 | while(s.node_num<nodes.size()) { |
---|
[1040] | 259 | Parent::getNotifier(Node()).erase(Node(nodes.size()-1)); |
---|
[973] | 260 | nodes.pop_back(); |
---|
| 261 | } |
---|
[1011] | 262 | } |
---|
| 263 | |
---|
| 264 | public: |
---|
[1284] | 265 | |
---|
| 266 | ///Split a node. |
---|
| 267 | |
---|
| 268 | ///This function splits a node. First a new node is added to the graph, |
---|
| 269 | ///then the source of each outgoing edge of \c n is moved to this new node. |
---|
| 270 | ///If \c connect is \c true (this is the default value), then a new edge |
---|
| 271 | ///from \c n to the newly created node is also added. |
---|
| 272 | ///\return The newly created node. |
---|
| 273 | /// |
---|
| 274 | ///\note The <tt>Edge</tt>s |
---|
| 275 | ///referencing a moved edge remain |
---|
| 276 | ///valid. However <tt>InEdge</tt>'s and <tt>OutEdge</tt>'s |
---|
| 277 | ///may be invalidated. |
---|
[1770] | 278 | ///\warning This functionality cannot be used together with the Snapshot |
---|
[1284] | 279 | ///feature. |
---|
| 280 | ///\todo It could be implemented in a bit faster way. |
---|
| 281 | Node split(Node n, bool connect = true) |
---|
| 282 | { |
---|
[1718] | 283 | Node b = _split(n,connect); |
---|
| 284 | return b; |
---|
[1284] | 285 | } |
---|
| 286 | |
---|
| 287 | |
---|
[1011] | 288 | ///Class to make a snapshot of the graph and to restrore to it later. |
---|
| 289 | |
---|
| 290 | ///Class to make a snapshot of the graph and to restrore to it later. |
---|
| 291 | /// |
---|
| 292 | ///The newly added nodes and edges can be removed using the |
---|
| 293 | ///restore() function. |
---|
| 294 | ///\note After you restore a state, you cannot restore |
---|
| 295 | ///a later state, in other word you cannot add again the edges deleted |
---|
[1770] | 296 | ///by restore() using another Snapshot instance. |
---|
[1011] | 297 | /// |
---|
[1770] | 298 | class Snapshot |
---|
[1011] | 299 | { |
---|
| 300 | SmartGraph *g; |
---|
| 301 | protected: |
---|
| 302 | friend class SmartGraph; |
---|
| 303 | unsigned int node_num; |
---|
| 304 | unsigned int edge_num; |
---|
| 305 | public: |
---|
[1274] | 306 | ///Default constructor. |
---|
[1011] | 307 | |
---|
[1274] | 308 | ///Default constructor. |
---|
[1011] | 309 | ///To actually make a snapshot you must call save(). |
---|
| 310 | /// |
---|
[1770] | 311 | Snapshot() : g(0) {} |
---|
[1011] | 312 | ///Constructor that immediately makes a snapshot |
---|
| 313 | |
---|
| 314 | ///This constructor immediately makes a snapshot of the graph. |
---|
| 315 | ///\param _g The graph we make a snapshot of. |
---|
[1770] | 316 | Snapshot(SmartGraph &_g) :g(&_g) { |
---|
[1011] | 317 | node_num=g->nodes.size(); |
---|
| 318 | edge_num=g->edges.size(); |
---|
| 319 | } |
---|
| 320 | |
---|
| 321 | ///Make a snapshot. |
---|
| 322 | |
---|
| 323 | ///Make a snapshot of the graph. |
---|
| 324 | /// |
---|
| 325 | ///This function can be called more than once. In case of a repeated |
---|
| 326 | ///call, the previous snapshot gets lost. |
---|
| 327 | ///\param _g The graph we make the snapshot of. |
---|
| 328 | void save(SmartGraph &_g) |
---|
| 329 | { |
---|
| 330 | g=&_g; |
---|
| 331 | node_num=g->nodes.size(); |
---|
| 332 | edge_num=g->edges.size(); |
---|
| 333 | } |
---|
| 334 | |
---|
| 335 | ///Undo the changes until a snapshot. |
---|
| 336 | |
---|
| 337 | ///Undo the changes until a snapshot created by save(). |
---|
| 338 | /// |
---|
| 339 | ///\note After you restored a state, you cannot restore |
---|
| 340 | ///a later state, in other word you cannot add again the edges deleted |
---|
| 341 | ///by restore(). |
---|
| 342 | /// |
---|
| 343 | ///\todo This function might be called undo(). |
---|
| 344 | |
---|
| 345 | void restore() |
---|
| 346 | { |
---|
[1770] | 347 | g->restoreSnapshot(*this); |
---|
[1011] | 348 | } |
---|
| 349 | }; |
---|
[973] | 350 | }; |
---|
[1034] | 351 | |
---|
| 352 | |
---|
| 353 | /**************** Undirected List Graph ****************/ |
---|
| 354 | |
---|
| 355 | typedef ClearableUndirGraphExtender< |
---|
| 356 | ExtendableUndirGraphExtender< |
---|
| 357 | MappableUndirGraphExtender< |
---|
| 358 | IterableUndirGraphExtender< |
---|
| 359 | AlterableUndirGraphExtender< |
---|
[1669] | 360 | UndirGraphExtender<SmartGraphBase> > > > > > ExtendedUndirSmartGraphBase; |
---|
[1034] | 361 | |
---|
[1035] | 362 | ///A smart undirected graph class. |
---|
| 363 | |
---|
| 364 | ///This is a simple and fast undirected graph implementation. |
---|
| 365 | ///It is also quite memory efficient, but at the price |
---|
| 366 | ///that <b> it does support only limited (only stack-like) |
---|
| 367 | ///node and edge deletions</b>. |
---|
| 368 | ///Except from this it conforms to |
---|
| 369 | ///the \ref concept::UndirGraph "UndirGraph" concept. |
---|
| 370 | ///\sa concept::UndirGraph. |
---|
| 371 | /// |
---|
[1770] | 372 | ///\todo Snapshot hasn't been implemented yet. |
---|
[1035] | 373 | /// |
---|
[1669] | 374 | class UndirSmartGraph : public ExtendedUndirSmartGraphBase { |
---|
[1034] | 375 | }; |
---|
| 376 | |
---|
[950] | 377 | |
---|
[407] | 378 | /// @} |
---|
[921] | 379 | } //namespace lemon |
---|
[104] | 380 | |
---|
[157] | 381 | |
---|
[921] | 382 | #endif //LEMON_SMART_GRAPH_H |
---|