1 | /* -*- C++ -*- |
---|
2 | * lemon/graph_utils.h - Part of LEMON, a generic C++ optimization library |
---|
3 | * |
---|
4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
---|
5 | * (Egervary Research Group on Combinatorial Optimization, 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_GRAPH_UTILS_H |
---|
18 | #define LEMON_GRAPH_UTILS_H |
---|
19 | |
---|
20 | #include <iterator> |
---|
21 | #include <vector> |
---|
22 | #include <map> |
---|
23 | |
---|
24 | #include <lemon/invalid.h> |
---|
25 | #include <lemon/utility.h> |
---|
26 | #include <lemon/maps.h> |
---|
27 | #include <lemon/bits/alteration_notifier.h> |
---|
28 | |
---|
29 | ///\ingroup gutils |
---|
30 | ///\file |
---|
31 | ///\brief Graph utilities. |
---|
32 | /// |
---|
33 | ///\todo Please |
---|
34 | ///revise the documentation. |
---|
35 | /// |
---|
36 | |
---|
37 | |
---|
38 | namespace lemon { |
---|
39 | |
---|
40 | /// \addtogroup gutils |
---|
41 | /// @{ |
---|
42 | |
---|
43 | /// \brief Function to count the items in the graph. |
---|
44 | /// |
---|
45 | /// This function counts the items in the graph. |
---|
46 | /// The complexity of the function is O(n) because |
---|
47 | /// it iterates on all of the items. |
---|
48 | |
---|
49 | template <typename Graph, typename ItemIt> |
---|
50 | inline int countItems(const Graph& g) { |
---|
51 | int num = 0; |
---|
52 | for (ItemIt it(g); it != INVALID; ++it) { |
---|
53 | ++num; |
---|
54 | } |
---|
55 | return num; |
---|
56 | } |
---|
57 | |
---|
58 | // Node counting: |
---|
59 | |
---|
60 | template <typename Graph> |
---|
61 | inline |
---|
62 | typename enable_if<typename Graph::NodeNumTag, int>::type |
---|
63 | _countNodes(const Graph &g) { |
---|
64 | return g.nodeNum(); |
---|
65 | } |
---|
66 | |
---|
67 | template <typename Graph> |
---|
68 | inline int _countNodes(Wrap<Graph> w) { |
---|
69 | return countItems<Graph, typename Graph::NodeIt>(w.value); |
---|
70 | } |
---|
71 | |
---|
72 | /// \brief Function to count the nodes in the graph. |
---|
73 | /// |
---|
74 | /// This function counts the nodes in the graph. |
---|
75 | /// The complexity of the function is O(n) but for some |
---|
76 | /// graph structure it is specialized to run in O(1). |
---|
77 | /// |
---|
78 | /// \todo refer how to specialize it |
---|
79 | |
---|
80 | template <typename Graph> |
---|
81 | inline int countNodes(const Graph& g) { |
---|
82 | return _countNodes<Graph>(g); |
---|
83 | } |
---|
84 | |
---|
85 | // Edge counting: |
---|
86 | |
---|
87 | template <typename Graph> |
---|
88 | inline |
---|
89 | typename enable_if<typename Graph::EdgeNumTag, int>::type |
---|
90 | _countEdges(const Graph &g) { |
---|
91 | return g.edgeNum(); |
---|
92 | } |
---|
93 | |
---|
94 | template <typename Graph> |
---|
95 | inline int _countEdges(Wrap<Graph> w) { |
---|
96 | return countItems<Graph, typename Graph::EdgeIt>(w.value); |
---|
97 | } |
---|
98 | |
---|
99 | /// \brief Function to count the edges in the graph. |
---|
100 | /// |
---|
101 | /// This function counts the edges in the graph. |
---|
102 | /// The complexity of the function is O(e) but for some |
---|
103 | /// graph structure it is specialized to run in O(1). |
---|
104 | |
---|
105 | template <typename Graph> |
---|
106 | inline int countEdges(const Graph& g) { |
---|
107 | return _countEdges<Graph>(g); |
---|
108 | } |
---|
109 | |
---|
110 | // Undirected edge counting: |
---|
111 | |
---|
112 | template <typename Graph> |
---|
113 | inline |
---|
114 | typename enable_if<typename Graph::EdgeNumTag, int>::type |
---|
115 | _countUndirEdges(const Graph &g) { |
---|
116 | return g.undirEdgeNum(); |
---|
117 | } |
---|
118 | |
---|
119 | template <typename Graph> |
---|
120 | inline int _countUndirEdges(Wrap<Graph> w) { |
---|
121 | return countItems<Graph, typename Graph::UndirEdgeIt>(w.value); |
---|
122 | } |
---|
123 | |
---|
124 | /// \brief Function to count the edges in the graph. |
---|
125 | /// |
---|
126 | /// This function counts the edges in the graph. |
---|
127 | /// The complexity of the function is O(e) but for some |
---|
128 | /// graph structure it is specialized to run in O(1). |
---|
129 | |
---|
130 | template <typename Graph> |
---|
131 | inline int countUndirEdges(const Graph& g) { |
---|
132 | return _countUndirEdges<Graph>(g); |
---|
133 | } |
---|
134 | |
---|
135 | |
---|
136 | |
---|
137 | template <typename Graph, typename DegIt> |
---|
138 | inline int countNodeDegree(const Graph& _g, const typename Graph::Node& _n) { |
---|
139 | int num = 0; |
---|
140 | for (DegIt it(_g, _n); it != INVALID; ++it) { |
---|
141 | ++num; |
---|
142 | } |
---|
143 | return num; |
---|
144 | } |
---|
145 | |
---|
146 | /// Finds an edge between two nodes of a graph. |
---|
147 | |
---|
148 | /// Finds an edge from node \c u to node \c v in graph \c g. |
---|
149 | /// |
---|
150 | /// If \c prev is \ref INVALID (this is the default value), then |
---|
151 | /// it finds the first edge from \c u to \c v. Otherwise it looks for |
---|
152 | /// the next edge from \c u to \c v after \c prev. |
---|
153 | /// \return The found edge or \ref INVALID if there is no such an edge. |
---|
154 | /// |
---|
155 | /// Thus you can iterate through each edge from \c u to \c v as it follows. |
---|
156 | /// \code |
---|
157 | /// for(Edge e=findEdge(g,u,v);e!=INVALID;e=findEdge(g,u,v,e)) { |
---|
158 | /// ... |
---|
159 | /// } |
---|
160 | /// \endcode |
---|
161 | /// \todo We may want to use the \ref concept::GraphBase "GraphBase" |
---|
162 | /// interface here... |
---|
163 | /// \bug Untested ... |
---|
164 | template <typename Graph> |
---|
165 | typename Graph::Edge findEdge(const Graph &g, |
---|
166 | typename Graph::Node u, typename Graph::Node v, |
---|
167 | typename Graph::Edge prev = INVALID) |
---|
168 | { |
---|
169 | typename Graph::OutEdgeIt e(g,prev); |
---|
170 | // if(prev==INVALID) g.first(e,u); |
---|
171 | if(prev==INVALID) e=typename Graph::OutEdgeIt(g,u); |
---|
172 | else ++e; |
---|
173 | while(e!=INVALID && g.target(e)!=v) ++e; |
---|
174 | return e; |
---|
175 | } |
---|
176 | |
---|
177 | ///\e |
---|
178 | |
---|
179 | ///\todo Please document. |
---|
180 | /// |
---|
181 | template <typename Graph> |
---|
182 | inline int countOutEdges(const Graph& _g, const typename Graph::Node& _n) { |
---|
183 | return countNodeDegree<Graph, typename Graph::OutEdgeIt>(_g, _n); |
---|
184 | } |
---|
185 | |
---|
186 | ///\e |
---|
187 | |
---|
188 | ///\todo Please document. |
---|
189 | /// |
---|
190 | template <typename Graph> |
---|
191 | inline int countInEdges(const Graph& _g, const typename Graph::Node& _n) { |
---|
192 | return countNodeDegree<Graph, typename Graph::InEdgeIt>(_g, _n); |
---|
193 | } |
---|
194 | |
---|
195 | // graph copy |
---|
196 | |
---|
197 | template < |
---|
198 | typename DestinationGraph, |
---|
199 | typename SourceGraph, |
---|
200 | typename NodeBijection> |
---|
201 | void copyNodes(DestinationGraph& _d, const SourceGraph& _s, |
---|
202 | NodeBijection& _nb) { |
---|
203 | for (typename SourceGraph::NodeIt it(_s); it != INVALID; ++it) { |
---|
204 | _nb[it] = _d.addNode(); |
---|
205 | } |
---|
206 | } |
---|
207 | |
---|
208 | template < |
---|
209 | typename DestinationGraph, |
---|
210 | typename SourceGraph, |
---|
211 | typename NodeBijection, |
---|
212 | typename EdgeBijection> |
---|
213 | void copyEdges(DestinationGraph& _d, const SourceGraph& _s, |
---|
214 | const NodeBijection& _nb, EdgeBijection& _eb) { |
---|
215 | for (typename SourceGraph::EdgeIt it(_s); it != INVALID; ++it) { |
---|
216 | _eb[it] = _d.addEdge(_nb[_s.source(it)], _nb[_s.target(it)]); |
---|
217 | } |
---|
218 | } |
---|
219 | |
---|
220 | template < |
---|
221 | typename DestinationGraph, |
---|
222 | typename SourceGraph, |
---|
223 | typename NodeBijection, |
---|
224 | typename EdgeBijection> |
---|
225 | void copyGraph(DestinationGraph& _d, const SourceGraph& _s, |
---|
226 | NodeBijection& _nb, EdgeBijection& _eb) { |
---|
227 | nodeCopy(_d, _s, _nb); |
---|
228 | edgeCopy(_d, _s, _nb, _eb); |
---|
229 | } |
---|
230 | |
---|
231 | template < |
---|
232 | typename _DestinationGraph, |
---|
233 | typename _SourceGraph, |
---|
234 | typename _NodeBijection |
---|
235 | =typename _SourceGraph::template NodeMap<typename _DestinationGraph::Node>, |
---|
236 | typename _EdgeBijection |
---|
237 | = typename _SourceGraph::template EdgeMap<typename _DestinationGraph::Edge> |
---|
238 | > |
---|
239 | class GraphCopy { |
---|
240 | public: |
---|
241 | |
---|
242 | typedef _DestinationGraph DestinationGraph; |
---|
243 | typedef _SourceGraph SourceGraph; |
---|
244 | |
---|
245 | typedef _NodeBijection NodeBijection; |
---|
246 | typedef _EdgeBijection EdgeBijection; |
---|
247 | |
---|
248 | protected: |
---|
249 | |
---|
250 | NodeBijection node_bijection; |
---|
251 | EdgeBijection edge_bijection; |
---|
252 | |
---|
253 | public: |
---|
254 | |
---|
255 | GraphCopy(DestinationGraph& _d, const SourceGraph& _s) { |
---|
256 | copyGraph(_d, _s, node_bijection, edge_bijection); |
---|
257 | } |
---|
258 | |
---|
259 | const NodeBijection& getNodeBijection() const { |
---|
260 | return node_bijection; |
---|
261 | } |
---|
262 | |
---|
263 | const EdgeBijection& getEdgeBijection() const { |
---|
264 | return edge_bijection; |
---|
265 | } |
---|
266 | |
---|
267 | }; |
---|
268 | |
---|
269 | |
---|
270 | template <typename _Graph, typename _Item> |
---|
271 | class ItemSetTraits {}; |
---|
272 | |
---|
273 | template <typename _Graph> |
---|
274 | class ItemSetTraits<_Graph, typename _Graph::Node> { |
---|
275 | public: |
---|
276 | |
---|
277 | typedef _Graph Graph; |
---|
278 | |
---|
279 | typedef typename Graph::Node Item; |
---|
280 | typedef typename Graph::NodeIt ItemIt; |
---|
281 | |
---|
282 | template <typename _Value> |
---|
283 | class Map : public Graph::template NodeMap<_Value> { |
---|
284 | public: |
---|
285 | typedef typename Graph::template NodeMap<_Value> Parent; |
---|
286 | typedef typename Parent::Value Value; |
---|
287 | |
---|
288 | Map(const Graph& _graph) : Parent(_graph) {} |
---|
289 | Map(const Graph& _graph, const Value& _value) |
---|
290 | : Parent(_graph, _value) {} |
---|
291 | }; |
---|
292 | |
---|
293 | }; |
---|
294 | |
---|
295 | template <typename _Graph> |
---|
296 | class ItemSetTraits<_Graph, typename _Graph::Edge> { |
---|
297 | public: |
---|
298 | |
---|
299 | typedef _Graph Graph; |
---|
300 | |
---|
301 | typedef typename Graph::Edge Item; |
---|
302 | typedef typename Graph::EdgeIt ItemIt; |
---|
303 | |
---|
304 | template <typename _Value> |
---|
305 | class Map : public Graph::template EdgeMap<_Value> { |
---|
306 | public: |
---|
307 | typedef typename Graph::template EdgeMap<_Value> Parent; |
---|
308 | typedef typename Parent::Value Value; |
---|
309 | |
---|
310 | Map(const Graph& _graph) : Parent(_graph) {} |
---|
311 | Map(const Graph& _graph, const Value& _value) |
---|
312 | : Parent(_graph, _value) {} |
---|
313 | }; |
---|
314 | |
---|
315 | }; |
---|
316 | |
---|
317 | template <typename _Graph> |
---|
318 | class ItemSetTraits<_Graph, typename _Graph::UndirEdge> { |
---|
319 | public: |
---|
320 | |
---|
321 | typedef _Graph Graph; |
---|
322 | |
---|
323 | typedef typename Graph::UndirEdge Item; |
---|
324 | typedef typename Graph::UndirEdgeIt ItemIt; |
---|
325 | |
---|
326 | template <typename _Value> |
---|
327 | class Map : public Graph::template UndirEdgeMap<_Value> { |
---|
328 | public: |
---|
329 | typedef typename Graph::template UndirEdgeMap<_Value> Parent; |
---|
330 | typedef typename Parent::Value Value; |
---|
331 | |
---|
332 | Map(const Graph& _graph) : Parent(_graph) {} |
---|
333 | Map(const Graph& _graph, const Value& _value) |
---|
334 | : Parent(_graph, _value) {} |
---|
335 | }; |
---|
336 | |
---|
337 | }; |
---|
338 | |
---|
339 | /// @} |
---|
340 | |
---|
341 | /// \addtogroup graph_maps |
---|
342 | /// @{ |
---|
343 | |
---|
344 | template <typename Map, typename Enable = void> |
---|
345 | struct ReferenceMapTraits { |
---|
346 | typedef typename Map::Value Value; |
---|
347 | typedef typename Map::Value& Reference; |
---|
348 | typedef const typename Map::Value& ConstReference; |
---|
349 | typedef typename Map::Value* Pointer; |
---|
350 | typedef const typename Map::Value* ConstPointer; |
---|
351 | }; |
---|
352 | |
---|
353 | template <typename Map> |
---|
354 | struct ReferenceMapTraits< |
---|
355 | Map, |
---|
356 | typename enable_if<typename Map::FullTypeTag, void>::type |
---|
357 | > { |
---|
358 | typedef typename Map::Value Value; |
---|
359 | typedef typename Map::Reference Reference; |
---|
360 | typedef typename Map::ConstReference ConstReference; |
---|
361 | typedef typename Map::Pointer Pointer; |
---|
362 | typedef typename Map::ConstPointer ConstPointer; |
---|
363 | }; |
---|
364 | |
---|
365 | /// Provides an immutable and unique id for each item in the graph. |
---|
366 | |
---|
367 | /// The IdMap class provides an unique and immutable mapping for each item |
---|
368 | /// in the graph. |
---|
369 | /// |
---|
370 | template <typename _Graph, typename _Item> |
---|
371 | class IdMap { |
---|
372 | public: |
---|
373 | typedef _Graph Graph; |
---|
374 | typedef int Value; |
---|
375 | typedef _Item Item; |
---|
376 | typedef _Item Key; |
---|
377 | |
---|
378 | typedef True NeedCopy; |
---|
379 | |
---|
380 | /// \brief Constructor. |
---|
381 | /// |
---|
382 | /// Constructor for creating id map. |
---|
383 | IdMap(const Graph& _graph) : graph(&_graph) {} |
---|
384 | |
---|
385 | /// \brief Gives back the \e id of the item. |
---|
386 | /// |
---|
387 | /// Gives back the immutable and unique \e id of the map. |
---|
388 | int operator[](const Item& item) const { return graph->id(item);} |
---|
389 | |
---|
390 | |
---|
391 | private: |
---|
392 | const Graph* graph; |
---|
393 | |
---|
394 | public: |
---|
395 | |
---|
396 | /// \brief The class represents the inverse of the map. |
---|
397 | /// |
---|
398 | /// The class represents the inverse of the map. |
---|
399 | /// \see inverse() |
---|
400 | class InverseMap { |
---|
401 | public: |
---|
402 | |
---|
403 | typedef True NeedCopy; |
---|
404 | |
---|
405 | /// \brief Constructor. |
---|
406 | /// |
---|
407 | /// Constructor for creating an id-to-item map. |
---|
408 | InverseMap(const Graph& _graph) : graph(&_graph) {} |
---|
409 | |
---|
410 | /// \brief Constructor. |
---|
411 | /// |
---|
412 | /// Constructor for creating an id-to-item map. |
---|
413 | InverseMap(const IdMap& idMap) : graph(idMap.graph) {} |
---|
414 | |
---|
415 | /// \brief Gives back the given item from its id. |
---|
416 | /// |
---|
417 | /// Gives back the given item from its id. |
---|
418 | /// |
---|
419 | Item operator[](int id) const { return graph->fromId(id, Item());} |
---|
420 | private: |
---|
421 | const Graph* graph; |
---|
422 | }; |
---|
423 | |
---|
424 | /// \brief Gives back the inverse of the map. |
---|
425 | /// |
---|
426 | /// Gives back the inverse of the map. |
---|
427 | InverseMap inverse() const { return InverseMap(*graph);} |
---|
428 | |
---|
429 | }; |
---|
430 | |
---|
431 | |
---|
432 | /// \brief General inversable graph-map type. |
---|
433 | |
---|
434 | /// This type provides simple inversable map functions. |
---|
435 | /// The InversableMap wraps an arbitrary ReadWriteMap |
---|
436 | /// and if a key is setted to a new value then store it |
---|
437 | /// in the inverse map. |
---|
438 | /// \param _Graph The graph type. |
---|
439 | /// \param _Map The map to extend with inversable functionality. |
---|
440 | template < |
---|
441 | typename _Graph, |
---|
442 | typename _Item, |
---|
443 | typename _Value, |
---|
444 | typename _Map |
---|
445 | = typename ItemSetTraits<_Graph, _Item>::template Map<_Value>::Parent |
---|
446 | > |
---|
447 | class InvertableMap : protected _Map { |
---|
448 | |
---|
449 | public: |
---|
450 | |
---|
451 | typedef _Map Map; |
---|
452 | typedef _Graph Graph; |
---|
453 | |
---|
454 | /// The key type of InvertableMap (Node, Edge, UndirEdge). |
---|
455 | typedef typename _Map::Key Key; |
---|
456 | /// The value type of the InvertableMap. |
---|
457 | typedef typename _Map::Value Value; |
---|
458 | |
---|
459 | /// \brief Constructor. |
---|
460 | /// |
---|
461 | /// Construct a new InvertableMap for the graph. |
---|
462 | /// |
---|
463 | InvertableMap(const Graph& graph) : Map(graph) {} |
---|
464 | |
---|
465 | /// \brief The setter function of the map. |
---|
466 | /// |
---|
467 | /// Sets the mapped value. |
---|
468 | void set(const Key& key, const Value& val) { |
---|
469 | Value oldval = Map::operator[](key); |
---|
470 | typename Container::iterator it = invMap.find(oldval); |
---|
471 | if (it != invMap.end() && it->second == key) { |
---|
472 | invMap.erase(it); |
---|
473 | } |
---|
474 | invMap.insert(make_pair(val, key)); |
---|
475 | Map::set(key, val); |
---|
476 | } |
---|
477 | |
---|
478 | /// \brief The getter function of the map. |
---|
479 | /// |
---|
480 | /// It gives back the value associated with the key. |
---|
481 | const Value operator[](const Key& key) const { |
---|
482 | return Map::operator[](key); |
---|
483 | } |
---|
484 | |
---|
485 | protected: |
---|
486 | |
---|
487 | /// \brief Add a new key to the map. |
---|
488 | /// |
---|
489 | /// Add a new key to the map. It is called by the |
---|
490 | /// \c AlterationNotifier. |
---|
491 | virtual void add(const Key& key) { |
---|
492 | Map::add(key); |
---|
493 | } |
---|
494 | |
---|
495 | /// \brief Erase the key from the map. |
---|
496 | /// |
---|
497 | /// Erase the key to the map. It is called by the |
---|
498 | /// \c AlterationNotifier. |
---|
499 | virtual void erase(const Key& key) { |
---|
500 | Value val = Map::operator[](key); |
---|
501 | typename Container::iterator it = invMap.find(val); |
---|
502 | if (it != invMap.end() && it->second == key) { |
---|
503 | invMap.erase(it); |
---|
504 | } |
---|
505 | Map::erase(key); |
---|
506 | } |
---|
507 | |
---|
508 | /// \brief Clear the keys from the map and inverse map. |
---|
509 | /// |
---|
510 | /// Clear the keys from the map and inverse map. It is called by the |
---|
511 | /// \c AlterationNotifier. |
---|
512 | virtual void clear() { |
---|
513 | invMap.clear(); |
---|
514 | Map::clear(); |
---|
515 | } |
---|
516 | |
---|
517 | private: |
---|
518 | |
---|
519 | typedef std::map<Value, Key> Container; |
---|
520 | Container invMap; |
---|
521 | |
---|
522 | public: |
---|
523 | |
---|
524 | /// \brief The inverse map type. |
---|
525 | /// |
---|
526 | /// The inverse of this map. The subscript operator of the map |
---|
527 | /// gives back always the item what was last assigned to the value. |
---|
528 | class InverseMap { |
---|
529 | public: |
---|
530 | /// \brief Constructor of the InverseMap. |
---|
531 | /// |
---|
532 | /// Constructor of the InverseMap. |
---|
533 | InverseMap(const InvertableMap& _inverted) : inverted(_inverted) {} |
---|
534 | |
---|
535 | /// The value type of the InverseMap. |
---|
536 | typedef typename InvertableMap::Key Value; |
---|
537 | /// The key type of the InverseMap. |
---|
538 | typedef typename InvertableMap::Value Key; |
---|
539 | |
---|
540 | /// \brief Subscript operator. |
---|
541 | /// |
---|
542 | /// Subscript operator. It gives back always the item |
---|
543 | /// what was last assigned to the value. |
---|
544 | Value operator[](const Key& key) const { |
---|
545 | typename Container::const_iterator it = inverted.invMap.find(key); |
---|
546 | return it->second; |
---|
547 | } |
---|
548 | |
---|
549 | private: |
---|
550 | const InvertableMap& inverted; |
---|
551 | }; |
---|
552 | |
---|
553 | /// \brief It gives back the just readeable inverse map. |
---|
554 | /// |
---|
555 | /// It gives back the just readeable inverse map. |
---|
556 | InverseMap inverse() const { |
---|
557 | return InverseMap(*this); |
---|
558 | } |
---|
559 | |
---|
560 | |
---|
561 | |
---|
562 | }; |
---|
563 | |
---|
564 | /// \brief Provides a mutable, continuous and unique descriptor for each |
---|
565 | /// item in the graph. |
---|
566 | /// |
---|
567 | /// The DescriptorMap class provides a mutable, continuous and immutable |
---|
568 | /// mapping for each item in the graph. The value for an item may mutated |
---|
569 | /// on each operation when the an item erased or added to graph. |
---|
570 | /// |
---|
571 | /// \param _Graph The graph class the \c DescriptorMap belongs to. |
---|
572 | /// \param _Item The Item is the Key of the Map. It may be Node, Edge or |
---|
573 | /// UndirEdge. |
---|
574 | /// \param _Map A ReadWriteMap mapping from the item type to integer. |
---|
575 | template < |
---|
576 | typename _Graph, |
---|
577 | typename _Item, |
---|
578 | typename _Map |
---|
579 | = typename ItemSetTraits<_Graph, _Item>::template Map<int>::Parent |
---|
580 | > |
---|
581 | class DescriptorMap : protected _Map { |
---|
582 | |
---|
583 | typedef _Item Item; |
---|
584 | typedef _Map Map; |
---|
585 | |
---|
586 | public: |
---|
587 | /// The graph class of DescriptorMap. |
---|
588 | typedef _Graph Graph; |
---|
589 | |
---|
590 | /// The key type of DescriptorMap (Node, Edge, UndirEdge). |
---|
591 | typedef typename _Map::Key Key; |
---|
592 | /// The value type of DescriptorMap. |
---|
593 | typedef typename _Map::Value Value; |
---|
594 | |
---|
595 | /// \brief Constructor. |
---|
596 | /// |
---|
597 | /// Constructor for descriptor map. |
---|
598 | DescriptorMap(const Graph& _graph) : Map(_graph) { |
---|
599 | build(); |
---|
600 | } |
---|
601 | |
---|
602 | protected: |
---|
603 | |
---|
604 | /// \brief Add a new key to the map. |
---|
605 | /// |
---|
606 | /// Add a new key to the map. It is called by the |
---|
607 | /// \c AlterationNotifier. |
---|
608 | virtual void add(const Item& item) { |
---|
609 | Map::add(item); |
---|
610 | Map::set(item, invMap.size()); |
---|
611 | invMap.push_back(item); |
---|
612 | } |
---|
613 | |
---|
614 | /// \brief Erase the key from the map. |
---|
615 | /// |
---|
616 | /// Erase the key to the map. It is called by the |
---|
617 | /// \c AlterationNotifier. |
---|
618 | virtual void erase(const Item& item) { |
---|
619 | Map::set(invMap.back(), Map::operator[](item)); |
---|
620 | invMap[Map::operator[](item)] = invMap.back(); |
---|
621 | invMap.pop_back(); |
---|
622 | Map::erase(item); |
---|
623 | } |
---|
624 | |
---|
625 | /// \brief Build the unique map. |
---|
626 | /// |
---|
627 | /// Build the unique map. It is called by the |
---|
628 | /// \c AlterationNotifier. |
---|
629 | virtual void build() { |
---|
630 | Map::build(); |
---|
631 | Item it; |
---|
632 | const typename Map::Graph* graph = Map::getGraph(); |
---|
633 | for (graph->first(it); it != INVALID; graph->next(it)) { |
---|
634 | Map::set(it, invMap.size()); |
---|
635 | invMap.push_back(it); |
---|
636 | } |
---|
637 | } |
---|
638 | |
---|
639 | /// \brief Clear the keys from the map. |
---|
640 | /// |
---|
641 | /// Clear the keys from the map. It is called by the |
---|
642 | /// \c AlterationNotifier. |
---|
643 | virtual void clear() { |
---|
644 | invMap.clear(); |
---|
645 | Map::clear(); |
---|
646 | } |
---|
647 | |
---|
648 | /// \brief Gives back the \e descriptor of the item. |
---|
649 | /// |
---|
650 | /// Gives back the mutable and unique \e descriptor of the map. |
---|
651 | int operator[](const Item& item) const { |
---|
652 | return Map::operator[](item); |
---|
653 | } |
---|
654 | |
---|
655 | private: |
---|
656 | |
---|
657 | typedef std::vector<Item> Container; |
---|
658 | Container invMap; |
---|
659 | |
---|
660 | public: |
---|
661 | /// \brief The inverse map type. |
---|
662 | /// |
---|
663 | /// The inverse map type. |
---|
664 | class InverseMap { |
---|
665 | public: |
---|
666 | /// \brief Constructor of the InverseMap. |
---|
667 | /// |
---|
668 | /// Constructor of the InverseMap. |
---|
669 | InverseMap(const DescriptorMap& _inverted) |
---|
670 | : inverted(_inverted) {} |
---|
671 | |
---|
672 | |
---|
673 | /// The value type of the InverseMap. |
---|
674 | typedef typename DescriptorMap::Key Value; |
---|
675 | /// The key type of the InverseMap. |
---|
676 | typedef typename DescriptorMap::Value Key; |
---|
677 | |
---|
678 | /// \brief Subscript operator. |
---|
679 | /// |
---|
680 | /// Subscript operator. It gives back the item |
---|
681 | /// that the descriptor belongs to currently. |
---|
682 | Value operator[](const Key& key) const { |
---|
683 | return inverted.invMap[key]; |
---|
684 | } |
---|
685 | |
---|
686 | /// \brief Size of the map. |
---|
687 | /// |
---|
688 | /// Returns the size of the map. |
---|
689 | unsigned size() const { |
---|
690 | return inverted.invMap.size(); |
---|
691 | } |
---|
692 | |
---|
693 | private: |
---|
694 | const DescriptorMap& inverted; |
---|
695 | }; |
---|
696 | |
---|
697 | /// \brief Gives back the inverse of the map. |
---|
698 | /// |
---|
699 | /// Gives back the inverse of the map. |
---|
700 | const InverseMap inverse() const { |
---|
701 | return InverseMap(*this); |
---|
702 | } |
---|
703 | }; |
---|
704 | |
---|
705 | /// \brief Returns the source of the given edge. |
---|
706 | /// |
---|
707 | /// The SourceMap gives back the source Node of the given edge. |
---|
708 | /// \author Balazs Dezso |
---|
709 | template <typename Graph> |
---|
710 | class SourceMap { |
---|
711 | public: |
---|
712 | |
---|
713 | typedef True NeedCopy; |
---|
714 | |
---|
715 | typedef typename Graph::Node Value; |
---|
716 | typedef typename Graph::Edge Key; |
---|
717 | |
---|
718 | /// \brief Constructor |
---|
719 | /// |
---|
720 | /// Constructor |
---|
721 | /// \param _graph The graph that the map belongs to. |
---|
722 | SourceMap(const Graph& _graph) : graph(_graph) {} |
---|
723 | |
---|
724 | /// \brief The subscript operator. |
---|
725 | /// |
---|
726 | /// The subscript operator. |
---|
727 | /// \param edge The edge |
---|
728 | /// \return The source of the edge |
---|
729 | Value operator[](const Key& edge) { |
---|
730 | return graph.source(edge); |
---|
731 | } |
---|
732 | |
---|
733 | private: |
---|
734 | const Graph& graph; |
---|
735 | }; |
---|
736 | |
---|
737 | /// \brief Returns a \ref SourceMap class |
---|
738 | /// |
---|
739 | /// This function just returns an \ref SourceMap class. |
---|
740 | /// \relates SourceMap |
---|
741 | template <typename Graph> |
---|
742 | inline SourceMap<Graph> sourceMap(const Graph& graph) { |
---|
743 | return SourceMap<Graph>(graph); |
---|
744 | } |
---|
745 | |
---|
746 | /// \brief Returns the target of the given edge. |
---|
747 | /// |
---|
748 | /// The TargetMap gives back the target Node of the given edge. |
---|
749 | /// \author Balazs Dezso |
---|
750 | template <typename Graph> |
---|
751 | class TargetMap { |
---|
752 | public: |
---|
753 | |
---|
754 | typedef True NeedCopy; |
---|
755 | |
---|
756 | typedef typename Graph::Node Value; |
---|
757 | typedef typename Graph::Edge Key; |
---|
758 | |
---|
759 | /// \brief Constructor |
---|
760 | /// |
---|
761 | /// Constructor |
---|
762 | /// \param _graph The graph that the map belongs to. |
---|
763 | TargetMap(const Graph& _graph) : graph(_graph) {} |
---|
764 | |
---|
765 | /// \brief The subscript operator. |
---|
766 | /// |
---|
767 | /// The subscript operator. |
---|
768 | /// \param edge The edge |
---|
769 | /// \return The target of the edge |
---|
770 | Value operator[](const Key& key) { |
---|
771 | return graph.target(key); |
---|
772 | } |
---|
773 | |
---|
774 | private: |
---|
775 | const Graph& graph; |
---|
776 | }; |
---|
777 | |
---|
778 | /// \brief Returns a \ref TargetMap class |
---|
779 | /// |
---|
780 | /// This function just returns an \ref TargetMap class. |
---|
781 | /// \relates TargetMap |
---|
782 | template <typename Graph> |
---|
783 | inline TargetMap<Graph> targetMap(const Graph& graph) { |
---|
784 | return TargetMap<Graph>(graph); |
---|
785 | } |
---|
786 | |
---|
787 | /// \brief Returns the "forward" directed edge view of undirected edge. |
---|
788 | /// |
---|
789 | /// Returns the "forward" directed edge view of undirected edge. |
---|
790 | /// \author Balazs Dezso |
---|
791 | template <typename Graph> |
---|
792 | class ForwardMap { |
---|
793 | public: |
---|
794 | |
---|
795 | typedef True NeedCopy; |
---|
796 | |
---|
797 | typedef typename Graph::Edge Value; |
---|
798 | typedef typename Graph::UndirEdge Key; |
---|
799 | |
---|
800 | /// \brief Constructor |
---|
801 | /// |
---|
802 | /// Constructor |
---|
803 | /// \param _graph The graph that the map belongs to. |
---|
804 | ForwardMap(const Graph& _graph) : graph(_graph) {} |
---|
805 | |
---|
806 | /// \brief The subscript operator. |
---|
807 | /// |
---|
808 | /// The subscript operator. |
---|
809 | /// \param key An undirected edge |
---|
810 | /// \return The "forward" directed edge view of undirected edge |
---|
811 | Value operator[](const Key& key) const { |
---|
812 | return graph.edgeWithSource(key, graph.source(key)); |
---|
813 | } |
---|
814 | |
---|
815 | private: |
---|
816 | const Graph& graph; |
---|
817 | }; |
---|
818 | |
---|
819 | /// \brief Returns a \ref ForwardMap class |
---|
820 | /// |
---|
821 | /// This function just returns an \ref ForwardMap class. |
---|
822 | /// \relates ForwardMap |
---|
823 | template <typename Graph> |
---|
824 | inline ForwardMap<Graph> forwardMap(const Graph& graph) { |
---|
825 | return ForwardMap<Graph>(graph); |
---|
826 | } |
---|
827 | |
---|
828 | /// \brief Returns the "backward" directed edge view of undirected edge. |
---|
829 | /// |
---|
830 | /// Returns the "backward" directed edge view of undirected edge. |
---|
831 | /// \author Balazs Dezso |
---|
832 | template <typename Graph> |
---|
833 | class BackwardMap { |
---|
834 | public: |
---|
835 | typedef True NeedCopy; |
---|
836 | |
---|
837 | typedef typename Graph::Edge Value; |
---|
838 | typedef typename Graph::UndirEdge Key; |
---|
839 | |
---|
840 | /// \brief Constructor |
---|
841 | /// |
---|
842 | /// Constructor |
---|
843 | /// \param _graph The graph that the map belongs to. |
---|
844 | BackwardMap(const Graph& _graph) : graph(_graph) {} |
---|
845 | |
---|
846 | /// \brief The subscript operator. |
---|
847 | /// |
---|
848 | /// The subscript operator. |
---|
849 | /// \param key An undirected edge |
---|
850 | /// \return The "backward" directed edge view of undirected edge |
---|
851 | Value operator[](const Key& key) const { |
---|
852 | return graph.edgeWithSource(key, graph.target(key)); |
---|
853 | } |
---|
854 | |
---|
855 | private: |
---|
856 | const Graph& graph; |
---|
857 | }; |
---|
858 | |
---|
859 | /// \brief Returns a \ref BackwardMap class |
---|
860 | |
---|
861 | /// This function just returns an \ref BackwardMap class. |
---|
862 | /// \relates BackwardMap |
---|
863 | template <typename Graph> |
---|
864 | inline BackwardMap<Graph> backwardMap(const Graph& graph) { |
---|
865 | return BackwardMap<Graph>(graph); |
---|
866 | } |
---|
867 | |
---|
868 | template <typename _Graph> |
---|
869 | class DegMapBase { |
---|
870 | public: |
---|
871 | |
---|
872 | typedef _Graph Graph; |
---|
873 | |
---|
874 | protected: |
---|
875 | |
---|
876 | typedef typename Graph::template NodeMap<int> IntNodeMap; |
---|
877 | |
---|
878 | }; |
---|
879 | |
---|
880 | /// \brief Map of the node in-degrees. |
---|
881 | /// |
---|
882 | /// This map returns the in-degree of a node. Ones it is constructed, |
---|
883 | /// the degrees are stored in a standard NodeMap, so each query is done |
---|
884 | /// in constant time. On the other hand, the values updates automatically |
---|
885 | /// whenever the graph changes. |
---|
886 | /// |
---|
887 | /// \sa OutDegMap |
---|
888 | |
---|
889 | template <typename _Graph> |
---|
890 | class InDegMap |
---|
891 | : protected AlterationNotifier<typename _Graph::Edge>::ObserverBase { |
---|
892 | |
---|
893 | public: |
---|
894 | |
---|
895 | typedef _Graph Graph; |
---|
896 | typedef int Value; |
---|
897 | typedef typename Graph::Node Key; |
---|
898 | |
---|
899 | private: |
---|
900 | |
---|
901 | class AutoNodeMap : public Graph::template NodeMap<int> { |
---|
902 | public: |
---|
903 | |
---|
904 | typedef typename Graph::template NodeMap<int> Parent; |
---|
905 | |
---|
906 | typedef typename Parent::Key Key; |
---|
907 | typedef typename Parent::Value Value; |
---|
908 | |
---|
909 | AutoNodeMap(const Graph& graph) : Parent(graph, 0) {} |
---|
910 | |
---|
911 | void add(const Key& key) { |
---|
912 | Parent::add(key); |
---|
913 | Parent::set(key, 0); |
---|
914 | } |
---|
915 | }; |
---|
916 | |
---|
917 | public: |
---|
918 | |
---|
919 | /// \brief Constructor. |
---|
920 | /// |
---|
921 | /// Constructor for creating in-degree map. |
---|
922 | InDegMap(const Graph& _graph) : graph(_graph), deg(_graph) { |
---|
923 | AlterationNotifier<typename _Graph::Edge> |
---|
924 | ::ObserverBase::attach(graph.getNotifier(typename _Graph::Edge())); |
---|
925 | |
---|
926 | for(typename _Graph::NodeIt it(graph); it != INVALID; ++it) { |
---|
927 | deg[it] = countInEdges(graph, it); |
---|
928 | } |
---|
929 | } |
---|
930 | |
---|
931 | virtual ~InDegMap() { |
---|
932 | AlterationNotifier<typename _Graph::Edge>:: |
---|
933 | ObserverBase::detach(); |
---|
934 | } |
---|
935 | |
---|
936 | /// Gives back the in-degree of a Node. |
---|
937 | int operator[](const Key& key) const { |
---|
938 | return deg[key]; |
---|
939 | } |
---|
940 | |
---|
941 | protected: |
---|
942 | |
---|
943 | typedef typename Graph::Edge Edge; |
---|
944 | |
---|
945 | virtual void add(const Edge& edge) { |
---|
946 | ++deg[graph.target(edge)]; |
---|
947 | } |
---|
948 | |
---|
949 | virtual void erase(const Edge& edge) { |
---|
950 | --deg[graph.target(edge)]; |
---|
951 | } |
---|
952 | |
---|
953 | |
---|
954 | virtual void build() { |
---|
955 | for(typename _Graph::NodeIt it(graph); it != INVALID; ++it) { |
---|
956 | deg[it] = countInEdges(graph, it); |
---|
957 | } |
---|
958 | } |
---|
959 | |
---|
960 | virtual void clear() { |
---|
961 | for(typename _Graph::NodeIt it(graph); it != INVALID; ++it) { |
---|
962 | deg[it] = 0; |
---|
963 | } |
---|
964 | } |
---|
965 | private: |
---|
966 | |
---|
967 | const _Graph& graph; |
---|
968 | AutoNodeMap deg; |
---|
969 | }; |
---|
970 | |
---|
971 | |
---|
972 | /// \brief Map of the node out-degrees. |
---|
973 | /// |
---|
974 | /// This map returns the out-degree of a node. One it is constructed, |
---|
975 | /// the degrees are stored in a standard NodeMap, so each query is done |
---|
976 | /// in constant time. On the other hand, the values updates automatically |
---|
977 | /// whenever the graph changes. |
---|
978 | /// |
---|
979 | /// \sa OutDegMap |
---|
980 | |
---|
981 | template <typename _Graph> |
---|
982 | class OutDegMap |
---|
983 | : protected AlterationNotifier<typename _Graph::Edge>::ObserverBase { |
---|
984 | |
---|
985 | public: |
---|
986 | |
---|
987 | typedef _Graph Graph; |
---|
988 | typedef int Value; |
---|
989 | typedef typename Graph::Node Key; |
---|
990 | |
---|
991 | private: |
---|
992 | |
---|
993 | class AutoNodeMap : public Graph::template NodeMap<int> { |
---|
994 | public: |
---|
995 | |
---|
996 | typedef typename Graph::template NodeMap<int> Parent; |
---|
997 | |
---|
998 | typedef typename Parent::Key Key; |
---|
999 | typedef typename Parent::Value Value; |
---|
1000 | |
---|
1001 | AutoNodeMap(const Graph& graph) : Parent(graph, 0) {} |
---|
1002 | |
---|
1003 | void add(const Key& key) { |
---|
1004 | Parent::add(key); |
---|
1005 | Parent::set(key, 0); |
---|
1006 | } |
---|
1007 | }; |
---|
1008 | |
---|
1009 | public: |
---|
1010 | |
---|
1011 | /// \brief Constructor. |
---|
1012 | /// |
---|
1013 | /// Constructor for creating out-degree map. |
---|
1014 | OutDegMap(const Graph& _graph) : graph(_graph), deg(_graph) { |
---|
1015 | AlterationNotifier<typename _Graph::Edge> |
---|
1016 | ::ObserverBase::attach(graph.getNotifier(typename _Graph::Edge())); |
---|
1017 | |
---|
1018 | for(typename _Graph::NodeIt it(graph); it != INVALID; ++it) { |
---|
1019 | deg[it] = countOutEdges(graph, it); |
---|
1020 | } |
---|
1021 | } |
---|
1022 | |
---|
1023 | virtual ~OutDegMap() { |
---|
1024 | AlterationNotifier<typename _Graph::Edge>:: |
---|
1025 | ObserverBase::detach(); |
---|
1026 | } |
---|
1027 | |
---|
1028 | /// Gives back the in-degree of a Node. |
---|
1029 | int operator[](const Key& key) const { |
---|
1030 | return deg[key]; |
---|
1031 | } |
---|
1032 | |
---|
1033 | protected: |
---|
1034 | |
---|
1035 | typedef typename Graph::Edge Edge; |
---|
1036 | |
---|
1037 | virtual void add(const Edge& edge) { |
---|
1038 | ++deg[graph.source(edge)]; |
---|
1039 | } |
---|
1040 | |
---|
1041 | virtual void erase(const Edge& edge) { |
---|
1042 | --deg[graph.source(edge)]; |
---|
1043 | } |
---|
1044 | |
---|
1045 | |
---|
1046 | virtual void build() { |
---|
1047 | for(typename _Graph::NodeIt it(graph); it != INVALID; ++it) { |
---|
1048 | deg[it] = countOutEdges(graph, it); |
---|
1049 | } |
---|
1050 | } |
---|
1051 | |
---|
1052 | virtual void clear() { |
---|
1053 | for(typename _Graph::NodeIt it(graph); it != INVALID; ++it) { |
---|
1054 | deg[it] = 0; |
---|
1055 | } |
---|
1056 | } |
---|
1057 | private: |
---|
1058 | |
---|
1059 | const _Graph& graph; |
---|
1060 | AutoNodeMap deg; |
---|
1061 | }; |
---|
1062 | |
---|
1063 | /// @} |
---|
1064 | |
---|
1065 | } //END OF NAMESPACE LEMON |
---|
1066 | |
---|
1067 | #endif |
---|