1 | /* -*- C++ -*- |
---|
2 | * src/lemon/dijkstra.h - Part of LEMON, a generic C++ optimization library |
---|
3 | * |
---|
4 | * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
---|
5 | * (Egervary Combinatorial Optimization Research Group, EGRES). |
---|
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 | */ |
---|
16 | |
---|
17 | #ifndef LEMON_DIJKSTRA_H |
---|
18 | #define LEMON_DIJKSTRA_H |
---|
19 | |
---|
20 | ///\ingroup flowalgs |
---|
21 | ///\file |
---|
22 | ///\brief Dijkstra algorithm. |
---|
23 | |
---|
24 | #include <lemon/list_graph.h> |
---|
25 | #include <lemon/bin_heap.h> |
---|
26 | #include <lemon/invalid.h> |
---|
27 | |
---|
28 | namespace lemon { |
---|
29 | |
---|
30 | /// \addtogroup flowalgs |
---|
31 | /// @{ |
---|
32 | |
---|
33 | ///Default traits class of Dijkstra class. |
---|
34 | |
---|
35 | ///Default traits class of Dijkstra class. |
---|
36 | ///\param GR Graph type. |
---|
37 | ///\param LM Type of length map. |
---|
38 | template<class GR, class LM> |
---|
39 | struct DijkstraDefaultTraits |
---|
40 | { |
---|
41 | ///The graph type the algorithm runs on. |
---|
42 | typedef GR Graph; |
---|
43 | ///The type of the map that stores the edge lengths. |
---|
44 | |
---|
45 | ///It must meet the \ref concept::ReadMap "ReadMap" concept. |
---|
46 | /// |
---|
47 | typedef LM LengthMap; |
---|
48 | //The type of the length of the edges. |
---|
49 | typedef typename LM::Value Value; |
---|
50 | ///The heap type used by Dijkstra algorithm. |
---|
51 | |
---|
52 | ///The heap type used by Dijkstra algorithm. |
---|
53 | /// |
---|
54 | ///\sa BinHeap |
---|
55 | ///\sa Dijkstra |
---|
56 | typedef BinHeap<typename Graph::Node, |
---|
57 | typename LM::Value, |
---|
58 | typename GR::template NodeMap<int>, |
---|
59 | std::less<Value> > Heap; |
---|
60 | |
---|
61 | ///\brief The type of the map that stores the last |
---|
62 | ///edges of the shortest paths. |
---|
63 | /// |
---|
64 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
---|
65 | /// |
---|
66 | typedef typename Graph::template NodeMap<typename GR::Edge> PredMap; |
---|
67 | ///Instantiates a PredMap. |
---|
68 | |
---|
69 | ///\todo Please document... |
---|
70 | /// |
---|
71 | static PredMap *createPredMap(const GR &G) |
---|
72 | { |
---|
73 | return new PredMap(G); |
---|
74 | } |
---|
75 | ///\brief The type of the map that stores the last but one |
---|
76 | ///nodes of the shortest paths. |
---|
77 | /// |
---|
78 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
---|
79 | /// |
---|
80 | typedef typename Graph::template NodeMap<typename GR::Node> PredNodeMap; |
---|
81 | ///Instantiates a PredNodeMap. |
---|
82 | |
---|
83 | ///\todo Please document... |
---|
84 | /// |
---|
85 | static PredNodeMap *createPredNodeMap(const GR &G) |
---|
86 | { |
---|
87 | return new PredNodeMap(G); |
---|
88 | } |
---|
89 | ///The type of the map that stores the dists of the nodes. |
---|
90 | |
---|
91 | ///It must meet the \ref concept::WriteMap "WriteMap" concept. |
---|
92 | /// |
---|
93 | typedef typename Graph::template NodeMap<typename LM::Value> DistMap; |
---|
94 | ///Instantiates a DistMap. |
---|
95 | |
---|
96 | ///\todo Please document... |
---|
97 | /// |
---|
98 | static DistMap *createDistMap(const GR &G) |
---|
99 | { |
---|
100 | return new DistMap(G); |
---|
101 | } |
---|
102 | }; |
---|
103 | |
---|
104 | ///%Dijkstra algorithm class. |
---|
105 | |
---|
106 | ///This class provides an efficient implementation of %Dijkstra algorithm. |
---|
107 | ///The edge lengths are passed to the algorithm using a |
---|
108 | ///\ref concept::ReadMap "ReadMap", |
---|
109 | ///so it is easy to change it to any kind of length. |
---|
110 | /// |
---|
111 | ///The type of the length is determined by the |
---|
112 | ///\ref concept::ReadMap::Value "Value" of the length map. |
---|
113 | /// |
---|
114 | ///It is also possible to change the underlying priority heap. |
---|
115 | /// |
---|
116 | ///\param GR The graph type the algorithm runs on. The default value is |
---|
117 | ///\ref ListGraph. The value of GR is not used directly by Dijkstra, it |
---|
118 | ///is only passed to \ref DijkstraDefaultTraits. |
---|
119 | ///\param LM This read-only |
---|
120 | ///EdgeMap |
---|
121 | ///determines the |
---|
122 | ///lengths of the edges. It is read once for each edge, so the map |
---|
123 | ///may involve in relatively time consuming process to compute the edge |
---|
124 | ///length if it is necessary. The default map type is |
---|
125 | ///\ref concept::StaticGraph::EdgeMap "Graph::EdgeMap<int>". |
---|
126 | ///The value of LM is not used directly by Dijkstra, it |
---|
127 | ///is only passed to \ref DijkstraDefaultTraits. |
---|
128 | ///\param TR Traits class to set various data types used by the algorithm. |
---|
129 | ///The default traits class is |
---|
130 | ///\ref DijkstraDefaultTraits "DijkstraDefaultTraits<GR,LM>". |
---|
131 | ///See \ref DijkstraDefaultTraits for the documentation of |
---|
132 | ///a Dijkstra traits class. |
---|
133 | /// |
---|
134 | ///\author Jacint Szabo and Alpar Juttner |
---|
135 | ///\todo We need a typedef-names should be standardized. (-: |
---|
136 | |
---|
137 | #ifdef DOXYGEN |
---|
138 | template <typename GR, |
---|
139 | typename LM, |
---|
140 | typename TR> |
---|
141 | #else |
---|
142 | template <typename GR=ListGraph, |
---|
143 | typename LM=typename GR::template EdgeMap<int>, |
---|
144 | typename TR=DijkstraDefaultTraits<GR,LM> > |
---|
145 | #endif |
---|
146 | class Dijkstra{ |
---|
147 | public: |
---|
148 | typedef TR Traits; |
---|
149 | ///The type of the underlying graph. |
---|
150 | typedef typename TR::Graph Graph; |
---|
151 | ///\e |
---|
152 | typedef typename Graph::Node Node; |
---|
153 | ///\e |
---|
154 | typedef typename Graph::NodeIt NodeIt; |
---|
155 | ///\e |
---|
156 | typedef typename Graph::Edge Edge; |
---|
157 | ///\e |
---|
158 | typedef typename Graph::OutEdgeIt OutEdgeIt; |
---|
159 | |
---|
160 | ///The type of the length of the edges. |
---|
161 | typedef typename TR::LengthMap::Value Value; |
---|
162 | ///The type of the map that stores the edge lengths. |
---|
163 | typedef typename TR::LengthMap LengthMap; |
---|
164 | ///\brief The type of the map that stores the last |
---|
165 | ///edges of the shortest paths. |
---|
166 | typedef typename TR::PredMap PredMap; |
---|
167 | ///\brief The type of the map that stores the last but one |
---|
168 | ///nodes of the shortest paths. |
---|
169 | typedef typename TR::PredNodeMap PredNodeMap; |
---|
170 | ///The type of the map that stores the dists of the nodes. |
---|
171 | typedef typename TR::DistMap DistMap; |
---|
172 | ///The heap type used by the dijkstra algorithm. |
---|
173 | typedef typename TR::Heap Heap; |
---|
174 | private: |
---|
175 | /// Pointer to the underlying graph. |
---|
176 | const Graph *G; |
---|
177 | /// Pointer to the length map |
---|
178 | const LengthMap *length; |
---|
179 | ///Pointer to the map of predecessors edges. |
---|
180 | PredMap *predecessor; |
---|
181 | ///Indicates if \ref predecessor is locally allocated (\c true) or not. |
---|
182 | bool local_predecessor; |
---|
183 | ///Pointer to the map of predecessors nodes. |
---|
184 | PredNodeMap *pred_node; |
---|
185 | ///Indicates if \ref pred_node is locally allocated (\c true) or not. |
---|
186 | bool local_pred_node; |
---|
187 | ///Pointer to the map of distances. |
---|
188 | DistMap *distance; |
---|
189 | ///Indicates if \ref distance is locally allocated (\c true) or not. |
---|
190 | bool local_distance; |
---|
191 | |
---|
192 | ///The source node of the last execution. |
---|
193 | Node source; |
---|
194 | |
---|
195 | ///Initializes the maps. |
---|
196 | |
---|
197 | ///\todo Error if \c G or are \c NULL. What about \c length? |
---|
198 | ///\todo Better memory allocation (instead of new). |
---|
199 | void init_maps() |
---|
200 | { |
---|
201 | if(!predecessor) { |
---|
202 | local_predecessor = true; |
---|
203 | predecessor = Traits::createPredMap(*G); |
---|
204 | } |
---|
205 | if(!pred_node) { |
---|
206 | local_pred_node = true; |
---|
207 | pred_node = Traits::createPredNodeMap(*G); |
---|
208 | } |
---|
209 | if(!distance) { |
---|
210 | local_distance = true; |
---|
211 | distance = Traits::createDistMap(*G); |
---|
212 | } |
---|
213 | } |
---|
214 | |
---|
215 | public : |
---|
216 | |
---|
217 | template <class T> |
---|
218 | struct SetPredMapTraits : public Traits { |
---|
219 | typedef T PredMap; |
---|
220 | ///\todo An exception should be thrown. |
---|
221 | /// |
---|
222 | static PredMap *createPredMap(const Graph &G) |
---|
223 | { |
---|
224 | std::cerr << __FILE__ ":" << __LINE__ << |
---|
225 | ": error: Special maps should be manually created" << std::endl; |
---|
226 | exit(1); |
---|
227 | } |
---|
228 | }; |
---|
229 | ///\ref named-templ-param "Named parameter" for setting PredMap type |
---|
230 | |
---|
231 | ///\relates Dijkstra |
---|
232 | ///\ingroup flowalgs |
---|
233 | ///\ref named-templ-param "Named parameter" for setting PredMap type |
---|
234 | template <class T> |
---|
235 | class SetPredMap : public Dijkstra< Graph, |
---|
236 | LengthMap, |
---|
237 | SetPredMapTraits<T> > { }; |
---|
238 | |
---|
239 | template <class T> |
---|
240 | struct SetPredNodeMapTraits : public Traits { |
---|
241 | typedef T PredNodeMap; |
---|
242 | ///\todo An exception should be thrown. |
---|
243 | /// |
---|
244 | static PredNodeMap *createPredNodeMap(const Graph &G) |
---|
245 | { |
---|
246 | std::cerr << __FILE__ ":" << __LINE__ << |
---|
247 | ": error: Special maps should be manually created" << std::endl; |
---|
248 | exit(1); |
---|
249 | } |
---|
250 | }; |
---|
251 | ///\ref named-templ-param "Named parameter" for setting PredNodeMap type |
---|
252 | |
---|
253 | ///\ingroup flowalgs |
---|
254 | ///\ref named-templ-param "Named parameter" for setting PredNodeMap type |
---|
255 | template <class T> |
---|
256 | class SetPredNodeMap : public Dijkstra< Graph, |
---|
257 | LengthMap, |
---|
258 | SetPredNodeMapTraits<T> > { }; |
---|
259 | |
---|
260 | template <class T> |
---|
261 | struct SetDistMapTraits : public Traits { |
---|
262 | typedef T DistMap; |
---|
263 | ///\todo An exception should be thrown. |
---|
264 | /// |
---|
265 | static DistMap *createDistMap(const Graph &G) |
---|
266 | { |
---|
267 | std::cerr << __FILE__ ":" << __LINE__ << |
---|
268 | ": error: Special maps should be manually created" << std::endl; |
---|
269 | exit(1); |
---|
270 | } |
---|
271 | }; |
---|
272 | ///\ref named-templ-param "Named parameter" for setting DistMap type |
---|
273 | |
---|
274 | ///\ingroup flowalgs |
---|
275 | ///\ref named-templ-param "Named parameter" for setting DistMap type |
---|
276 | template <class T> |
---|
277 | class SetDistMap : public Dijkstra< Graph, |
---|
278 | LengthMap, |
---|
279 | SetDistMapTraits<T> > { }; |
---|
280 | |
---|
281 | ///Constructor. |
---|
282 | |
---|
283 | ///\param _G the graph the algorithm will run on. |
---|
284 | ///\param _length the length map used by the algorithm. |
---|
285 | Dijkstra(const Graph& _G, const LengthMap& _length) : |
---|
286 | G(&_G), length(&_length), |
---|
287 | predecessor(NULL), local_predecessor(false), |
---|
288 | pred_node(NULL), local_pred_node(false), |
---|
289 | distance(NULL), local_distance(false) |
---|
290 | { } |
---|
291 | |
---|
292 | ///Destructor. |
---|
293 | ~Dijkstra() |
---|
294 | { |
---|
295 | if(local_predecessor) delete predecessor; |
---|
296 | if(local_pred_node) delete pred_node; |
---|
297 | if(local_distance) delete distance; |
---|
298 | } |
---|
299 | |
---|
300 | ///Sets the length map. |
---|
301 | |
---|
302 | ///Sets the length map. |
---|
303 | ///\return <tt> (*this) </tt> |
---|
304 | Dijkstra &setLengthMap(const LengthMap &m) |
---|
305 | { |
---|
306 | length = &m; |
---|
307 | return *this; |
---|
308 | } |
---|
309 | |
---|
310 | ///Sets the map storing the predecessor edges. |
---|
311 | |
---|
312 | ///Sets the map storing the predecessor edges. |
---|
313 | ///If you don't use this function before calling \ref run(), |
---|
314 | ///it will allocate one. The destuctor deallocates this |
---|
315 | ///automatically allocated map, of course. |
---|
316 | ///\return <tt> (*this) </tt> |
---|
317 | Dijkstra &setPredMap(PredMap &m) |
---|
318 | { |
---|
319 | if(local_predecessor) { |
---|
320 | delete predecessor; |
---|
321 | local_predecessor=false; |
---|
322 | } |
---|
323 | predecessor = &m; |
---|
324 | return *this; |
---|
325 | } |
---|
326 | |
---|
327 | ///Sets the map storing the predecessor nodes. |
---|
328 | |
---|
329 | ///Sets the map storing the predecessor nodes. |
---|
330 | ///If you don't use this function before calling \ref run(), |
---|
331 | ///it will allocate one. The destuctor deallocates this |
---|
332 | ///automatically allocated map, of course. |
---|
333 | ///\return <tt> (*this) </tt> |
---|
334 | Dijkstra &setPredNodeMap(PredNodeMap &m) |
---|
335 | { |
---|
336 | if(local_pred_node) { |
---|
337 | delete pred_node; |
---|
338 | local_pred_node=false; |
---|
339 | } |
---|
340 | pred_node = &m; |
---|
341 | return *this; |
---|
342 | } |
---|
343 | |
---|
344 | ///Sets the map storing the distances calculated by the algorithm. |
---|
345 | |
---|
346 | ///Sets the map storing the distances calculated by the algorithm. |
---|
347 | ///If you don't use this function before calling \ref run(), |
---|
348 | ///it will allocate one. The destuctor deallocates this |
---|
349 | ///automatically allocated map, of course. |
---|
350 | ///\return <tt> (*this) </tt> |
---|
351 | Dijkstra &setDistMap(DistMap &m) |
---|
352 | { |
---|
353 | if(local_distance) { |
---|
354 | delete distance; |
---|
355 | local_distance=false; |
---|
356 | } |
---|
357 | distance = &m; |
---|
358 | return *this; |
---|
359 | } |
---|
360 | |
---|
361 | ///Runs %Dijkstra algorithm from node \c s. |
---|
362 | |
---|
363 | ///This method runs the %Dijkstra algorithm from a root node \c s |
---|
364 | ///in order to |
---|
365 | ///compute the |
---|
366 | ///shortest path to each node. The algorithm computes |
---|
367 | ///- The shortest path tree. |
---|
368 | ///- The distance of each node from the root. |
---|
369 | ///\todo heap_map's type could also be in the traits class. |
---|
370 | void run(Node s) { |
---|
371 | |
---|
372 | init_maps(); |
---|
373 | |
---|
374 | source = s; |
---|
375 | |
---|
376 | for ( NodeIt u(*G) ; u!=INVALID ; ++u ) { |
---|
377 | predecessor->set(u,INVALID); |
---|
378 | pred_node->set(u,INVALID); |
---|
379 | } |
---|
380 | |
---|
381 | typename Graph::template NodeMap<int> heap_map(*G,-1); |
---|
382 | |
---|
383 | Heap heap(heap_map); |
---|
384 | |
---|
385 | heap.push(s,0); |
---|
386 | |
---|
387 | while ( !heap.empty() ) { |
---|
388 | |
---|
389 | Node v=heap.top(); |
---|
390 | Value oldvalue=heap[v]; |
---|
391 | heap.pop(); |
---|
392 | distance->set(v, oldvalue); |
---|
393 | |
---|
394 | |
---|
395 | for(OutEdgeIt e(*G,v); e!=INVALID; ++e) { |
---|
396 | Node w=G->target(e); |
---|
397 | switch(heap.state(w)) { |
---|
398 | case Heap::PRE_HEAP: |
---|
399 | heap.push(w,oldvalue+(*length)[e]); |
---|
400 | predecessor->set(w,e); |
---|
401 | pred_node->set(w,v); |
---|
402 | break; |
---|
403 | case Heap::IN_HEAP: |
---|
404 | if ( oldvalue+(*length)[e] < heap[w] ) { |
---|
405 | heap.decrease(w, oldvalue+(*length)[e]); |
---|
406 | predecessor->set(w,e); |
---|
407 | pred_node->set(w,v); |
---|
408 | } |
---|
409 | break; |
---|
410 | case Heap::POST_HEAP: |
---|
411 | break; |
---|
412 | } |
---|
413 | } |
---|
414 | } |
---|
415 | } |
---|
416 | |
---|
417 | ///The distance of a node from the root. |
---|
418 | |
---|
419 | ///Returns the distance of a node from the root. |
---|
420 | ///\pre \ref run() must be called before using this function. |
---|
421 | ///\warning If node \c v in unreachable from the root the return value |
---|
422 | ///of this funcion is undefined. |
---|
423 | Value dist(Node v) const { return (*distance)[v]; } |
---|
424 | |
---|
425 | ///Returns the 'previous edge' of the shortest path tree. |
---|
426 | |
---|
427 | ///For a node \c v it returns the 'previous edge' of the shortest path tree, |
---|
428 | ///i.e. it returns the last edge of a shortest path from the root to \c |
---|
429 | ///v. It is \ref INVALID |
---|
430 | ///if \c v is unreachable from the root or if \c v=s. The |
---|
431 | ///shortest path tree used here is equal to the shortest path tree used in |
---|
432 | ///\ref predNode(Node v). \pre \ref run() must be called before using |
---|
433 | ///this function. |
---|
434 | ///\todo predEdge could be a better name. |
---|
435 | Edge pred(Node v) const { return (*predecessor)[v]; } |
---|
436 | |
---|
437 | ///Returns the 'previous node' of the shortest path tree. |
---|
438 | |
---|
439 | ///For a node \c v it returns the 'previous node' of the shortest path tree, |
---|
440 | ///i.e. it returns the last but one node from a shortest path from the |
---|
441 | ///root to \c /v. It is INVALID if \c v is unreachable from the root or if |
---|
442 | ///\c v=s. The shortest path tree used here is equal to the shortest path |
---|
443 | ///tree used in \ref pred(Node v). \pre \ref run() must be called before |
---|
444 | ///using this function. |
---|
445 | Node predNode(Node v) const { return (*pred_node)[v]; } |
---|
446 | |
---|
447 | ///Returns a reference to the NodeMap of distances. |
---|
448 | |
---|
449 | ///Returns a reference to the NodeMap of distances. \pre \ref run() must |
---|
450 | ///be called before using this function. |
---|
451 | const DistMap &distMap() const { return *distance;} |
---|
452 | |
---|
453 | ///Returns a reference to the shortest path tree map. |
---|
454 | |
---|
455 | ///Returns a reference to the NodeMap of the edges of the |
---|
456 | ///shortest path tree. |
---|
457 | ///\pre \ref run() must be called before using this function. |
---|
458 | const PredMap &predMap() const { return *predecessor;} |
---|
459 | |
---|
460 | ///Returns a reference to the map of nodes of shortest paths. |
---|
461 | |
---|
462 | ///Returns a reference to the NodeMap of the last but one nodes of the |
---|
463 | ///shortest path tree. |
---|
464 | ///\pre \ref run() must be called before using this function. |
---|
465 | const PredNodeMap &predNodeMap() const { return *pred_node;} |
---|
466 | |
---|
467 | ///Checks if a node is reachable from the root. |
---|
468 | |
---|
469 | ///Returns \c true if \c v is reachable from the root. |
---|
470 | ///\note The root node is reported to be reached! |
---|
471 | ///\pre \ref run() must be called before using this function. |
---|
472 | /// |
---|
473 | bool reached(Node v) { return v==source || (*predecessor)[v]!=INVALID; } |
---|
474 | |
---|
475 | }; |
---|
476 | |
---|
477 | ///\e |
---|
478 | |
---|
479 | ///\e |
---|
480 | /// |
---|
481 | template<class TR> |
---|
482 | class _Dijkstra |
---|
483 | { |
---|
484 | typedef TR Traits; |
---|
485 | |
---|
486 | ///The type of the underlying graph. |
---|
487 | typedef typename TR::Graph Graph; |
---|
488 | ///\e |
---|
489 | typedef typename Graph::Node Node; |
---|
490 | ///\e |
---|
491 | typedef typename Graph::NodeIt NodeIt; |
---|
492 | ///\e |
---|
493 | typedef typename Graph::Edge Edge; |
---|
494 | ///\e |
---|
495 | typedef typename Graph::OutEdgeIt OutEdgeIt; |
---|
496 | |
---|
497 | ///The type of the map that stores the edge lengths. |
---|
498 | typedef typename TR::LengthMap LengthMap; |
---|
499 | ///The type of the length of the edges. |
---|
500 | typedef typename LengthMap::Value Value; |
---|
501 | ///\brief The type of the map that stores the last |
---|
502 | ///edges of the shortest paths. |
---|
503 | typedef typename TR::PredMap PredMap; |
---|
504 | ///\brief The type of the map that stores the last but one |
---|
505 | ///nodes of the shortest paths. |
---|
506 | typedef typename TR::PredNodeMap PredNodeMap; |
---|
507 | ///The type of the map that stores the dists of the nodes. |
---|
508 | typedef typename TR::DistMap DistMap; |
---|
509 | |
---|
510 | ///The heap type used by the dijkstra algorithm. |
---|
511 | typedef typename TR::Heap Heap; |
---|
512 | |
---|
513 | /// Pointer to the underlying graph. |
---|
514 | const Graph *G; |
---|
515 | /// Pointer to the length map |
---|
516 | const LengthMap *length; |
---|
517 | ///Pointer to the map of predecessors edges. |
---|
518 | PredMap *predecessor; |
---|
519 | ///Pointer to the map of predecessors nodes. |
---|
520 | PredNodeMap *pred_node; |
---|
521 | ///Pointer to the map of distances. |
---|
522 | DistMap *distance; |
---|
523 | |
---|
524 | Node source; |
---|
525 | |
---|
526 | public: |
---|
527 | _Dijkstra() : G(0), length(0), predecessor(0), pred_node(0), |
---|
528 | distance(0), source(INVALID) {} |
---|
529 | |
---|
530 | _Dijkstra(const Graph &g,const LengthMap &l, Node s) : |
---|
531 | G(&g), length(&l), predecessor(0), pred_node(0), |
---|
532 | distance(0), source(s) {} |
---|
533 | |
---|
534 | ~_Dijkstra() |
---|
535 | { |
---|
536 | Dijkstra<Graph,LengthMap,TR> Dij(*G,*length); |
---|
537 | if(predecessor) Dij.setPredMap(*predecessor); |
---|
538 | if(pred_node) Dij.setPredNodeMap(*pred_node); |
---|
539 | if(distance) Dij.setDistMap(*distance); |
---|
540 | Dij.run(source); |
---|
541 | } |
---|
542 | |
---|
543 | template<class T> |
---|
544 | struct SetPredMapTraits : public Traits {typedef T PredMap;}; |
---|
545 | |
---|
546 | ///\e |
---|
547 | template<class T> |
---|
548 | _Dijkstra<SetPredMapTraits<T> > setPredMap(const T &t) |
---|
549 | { |
---|
550 | _Dijkstra<SetPredMapTraits<T> > r; |
---|
551 | r.G=G; |
---|
552 | r.length=length; |
---|
553 | r.predecessor=&t; |
---|
554 | r.pred_node=pred_node; |
---|
555 | r.distance=distance; |
---|
556 | r.source=source; |
---|
557 | return r; |
---|
558 | } |
---|
559 | |
---|
560 | template<class T> |
---|
561 | struct SetPredNodeMapTraits :public Traits {typedef T PredNodeMap;}; |
---|
562 | ///\e |
---|
563 | template<class T> |
---|
564 | _Dijkstra<SetPredNodeMapTraits<T> > setPredNodeMap(const T &t) |
---|
565 | { |
---|
566 | _Dijkstra<SetPredNodeMapTraits<T> > r; |
---|
567 | r.G=G; |
---|
568 | r.length=length; |
---|
569 | r.predecessor=predecessor; |
---|
570 | r.pred_node=&t; |
---|
571 | r.distance=distance; |
---|
572 | r.source=source; |
---|
573 | return r; |
---|
574 | } |
---|
575 | |
---|
576 | template<class T> |
---|
577 | struct SetDistMapTraits : public Traits {typedef T DistMap;}; |
---|
578 | ///\e |
---|
579 | template<class T> |
---|
580 | _Dijkstra<SetDistMapTraits<T> > setDistMap(const T &t) |
---|
581 | { |
---|
582 | _Dijkstra<SetPredMapTraits<T> > r; |
---|
583 | r.G=G; |
---|
584 | r.length=length; |
---|
585 | r.predecessor=predecessor; |
---|
586 | r.pred_node=pred_node; |
---|
587 | r.distance=&t; |
---|
588 | r.source=source; |
---|
589 | return r; |
---|
590 | } |
---|
591 | |
---|
592 | ///\e |
---|
593 | _Dijkstra<TR> &setSource(Node s) |
---|
594 | { |
---|
595 | source=s; |
---|
596 | return *this; |
---|
597 | } |
---|
598 | |
---|
599 | }; |
---|
600 | |
---|
601 | ///\e |
---|
602 | |
---|
603 | ///\todo Please document... |
---|
604 | /// |
---|
605 | template<class GR, class LM> |
---|
606 | _Dijkstra<DijkstraDefaultTraits<GR,LM> > |
---|
607 | dijkstra(const GR &g,const LM &l,typename GR::Node s) |
---|
608 | { |
---|
609 | return _Dijkstra<DijkstraDefaultTraits<GR,LM> >(g,l,s); |
---|
610 | } |
---|
611 | |
---|
612 | /// @} |
---|
613 | |
---|
614 | } //END OF NAMESPACE LEMON |
---|
615 | |
---|
616 | #endif |
---|
617 | |
---|
618 | |
---|