1 | /* -*- mode: C++; indent-tabs-mode: nil; -*- |
---|
2 | * |
---|
3 | * This file is a part of LEMON, a generic C++ optimization library. |
---|
4 | * |
---|
5 | * Copyright (C) 2003-2013 |
---|
6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
---|
7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
---|
8 | * |
---|
9 | * Permission to use, modify and distribute this software is granted |
---|
10 | * provided that this copyright notice appears in all copies. For |
---|
11 | * precise terms see the accompanying LICENSE file. |
---|
12 | * |
---|
13 | * This software is provided "AS IS" with no warranty of any kind, |
---|
14 | * express or implied, and with no claim as to its suitability for any |
---|
15 | * purpose. |
---|
16 | * |
---|
17 | */ |
---|
18 | |
---|
19 | #ifndef LEMON_LIST_GRAPH_H |
---|
20 | #define LEMON_LIST_GRAPH_H |
---|
21 | |
---|
22 | ///\ingroup graphs |
---|
23 | ///\file |
---|
24 | ///\brief ListDigraph and ListGraph classes. |
---|
25 | |
---|
26 | #include <lemon/core.h> |
---|
27 | #include <lemon/error.h> |
---|
28 | #include <lemon/bits/graph_extender.h> |
---|
29 | |
---|
30 | #include <vector> |
---|
31 | #include <list> |
---|
32 | |
---|
33 | namespace lemon { |
---|
34 | |
---|
35 | class ListDigraph; |
---|
36 | |
---|
37 | class ListDigraphBase { |
---|
38 | |
---|
39 | protected: |
---|
40 | struct NodeT { |
---|
41 | int first_in, first_out; |
---|
42 | int prev, next; |
---|
43 | }; |
---|
44 | |
---|
45 | struct ArcT { |
---|
46 | int target, source; |
---|
47 | int prev_in, prev_out; |
---|
48 | int next_in, next_out; |
---|
49 | }; |
---|
50 | |
---|
51 | std::vector<NodeT> _nodes; |
---|
52 | |
---|
53 | int first_node; |
---|
54 | |
---|
55 | int first_free_node; |
---|
56 | |
---|
57 | std::vector<ArcT> _arcs; |
---|
58 | |
---|
59 | int first_free_arc; |
---|
60 | |
---|
61 | public: |
---|
62 | |
---|
63 | typedef ListDigraphBase Digraph; |
---|
64 | |
---|
65 | class Node { |
---|
66 | friend class ListDigraphBase; |
---|
67 | friend class ListDigraph; |
---|
68 | protected: |
---|
69 | |
---|
70 | int id; |
---|
71 | explicit Node(int pid) { id = pid;} |
---|
72 | |
---|
73 | public: |
---|
74 | Node() {} |
---|
75 | Node (Invalid) { id = -1; } |
---|
76 | bool operator==(const Node& node) const {return id == node.id;} |
---|
77 | bool operator!=(const Node& node) const {return id != node.id;} |
---|
78 | bool operator<(const Node& node) const {return id < node.id;} |
---|
79 | }; |
---|
80 | |
---|
81 | class Arc { |
---|
82 | friend class ListDigraphBase; |
---|
83 | friend class ListDigraph; |
---|
84 | protected: |
---|
85 | |
---|
86 | int id; |
---|
87 | explicit Arc(int pid) { id = pid;} |
---|
88 | |
---|
89 | public: |
---|
90 | Arc() {} |
---|
91 | Arc (Invalid) { id = -1; } |
---|
92 | bool operator==(const Arc& arc) const {return id == arc.id;} |
---|
93 | bool operator!=(const Arc& arc) const {return id != arc.id;} |
---|
94 | bool operator<(const Arc& arc) const {return id < arc.id;} |
---|
95 | }; |
---|
96 | |
---|
97 | |
---|
98 | |
---|
99 | ListDigraphBase() |
---|
100 | : _nodes(), first_node(-1), |
---|
101 | first_free_node(-1), _arcs(), first_free_arc(-1) {} |
---|
102 | |
---|
103 | |
---|
104 | int maxNodeId() const { return _nodes.size()-1; } |
---|
105 | int maxArcId() const { return _arcs.size()-1; } |
---|
106 | |
---|
107 | Node source(Arc e) const { return Node(_arcs[e.id].source); } |
---|
108 | Node target(Arc e) const { return Node(_arcs[e.id].target); } |
---|
109 | |
---|
110 | |
---|
111 | void first(Node& node) const { |
---|
112 | node.id = first_node; |
---|
113 | } |
---|
114 | |
---|
115 | void next(Node& node) const { |
---|
116 | node.id = _nodes[node.id].next; |
---|
117 | } |
---|
118 | |
---|
119 | |
---|
120 | void first(Arc& arc) const { |
---|
121 | int n; |
---|
122 | for(n = first_node; |
---|
123 | n != -1 && _nodes[n].first_out == -1; |
---|
124 | n = _nodes[n].next) {} |
---|
125 | arc.id = (n == -1) ? -1 : _nodes[n].first_out; |
---|
126 | } |
---|
127 | |
---|
128 | void next(Arc& arc) const { |
---|
129 | if (_arcs[arc.id].next_out != -1) { |
---|
130 | arc.id = _arcs[arc.id].next_out; |
---|
131 | } else { |
---|
132 | int n; |
---|
133 | for(n = _nodes[_arcs[arc.id].source].next; |
---|
134 | n != -1 && _nodes[n].first_out == -1; |
---|
135 | n = _nodes[n].next) {} |
---|
136 | arc.id = (n == -1) ? -1 : _nodes[n].first_out; |
---|
137 | } |
---|
138 | } |
---|
139 | |
---|
140 | void firstOut(Arc &e, const Node& v) const { |
---|
141 | e.id = _nodes[v.id].first_out; |
---|
142 | } |
---|
143 | void nextOut(Arc &e) const { |
---|
144 | e.id=_arcs[e.id].next_out; |
---|
145 | } |
---|
146 | |
---|
147 | void firstIn(Arc &e, const Node& v) const { |
---|
148 | e.id = _nodes[v.id].first_in; |
---|
149 | } |
---|
150 | void nextIn(Arc &e) const { |
---|
151 | e.id=_arcs[e.id].next_in; |
---|
152 | } |
---|
153 | |
---|
154 | |
---|
155 | static int id(Node v) { return v.id; } |
---|
156 | static int id(Arc e) { return e.id; } |
---|
157 | |
---|
158 | static Node nodeFromId(int id) { return Node(id);} |
---|
159 | static Arc arcFromId(int id) { return Arc(id);} |
---|
160 | |
---|
161 | bool valid(Node n) const { |
---|
162 | return n.id >= 0 && n.id < static_cast<int>(_nodes.size()) && |
---|
163 | _nodes[n.id].prev != -2; |
---|
164 | } |
---|
165 | |
---|
166 | bool valid(Arc a) const { |
---|
167 | return a.id >= 0 && a.id < static_cast<int>(_arcs.size()) && |
---|
168 | _arcs[a.id].prev_in != -2; |
---|
169 | } |
---|
170 | |
---|
171 | Node addNode() { |
---|
172 | int n; |
---|
173 | |
---|
174 | if(first_free_node==-1) { |
---|
175 | n = _nodes.size(); |
---|
176 | _nodes.push_back(NodeT()); |
---|
177 | } else { |
---|
178 | n = first_free_node; |
---|
179 | first_free_node = _nodes[n].next; |
---|
180 | } |
---|
181 | |
---|
182 | _nodes[n].next = first_node; |
---|
183 | if(first_node != -1) _nodes[first_node].prev = n; |
---|
184 | first_node = n; |
---|
185 | _nodes[n].prev = -1; |
---|
186 | |
---|
187 | _nodes[n].first_in = _nodes[n].first_out = -1; |
---|
188 | |
---|
189 | return Node(n); |
---|
190 | } |
---|
191 | |
---|
192 | Arc addArc(Node u, Node v) { |
---|
193 | int n; |
---|
194 | |
---|
195 | if (first_free_arc == -1) { |
---|
196 | n = _arcs.size(); |
---|
197 | _arcs.push_back(ArcT()); |
---|
198 | } else { |
---|
199 | n = first_free_arc; |
---|
200 | first_free_arc = _arcs[n].next_in; |
---|
201 | } |
---|
202 | |
---|
203 | _arcs[n].source = u.id; |
---|
204 | _arcs[n].target = v.id; |
---|
205 | |
---|
206 | _arcs[n].next_out = _nodes[u.id].first_out; |
---|
207 | if(_nodes[u.id].first_out != -1) { |
---|
208 | _arcs[_nodes[u.id].first_out].prev_out = n; |
---|
209 | } |
---|
210 | |
---|
211 | _arcs[n].next_in = _nodes[v.id].first_in; |
---|
212 | if(_nodes[v.id].first_in != -1) { |
---|
213 | _arcs[_nodes[v.id].first_in].prev_in = n; |
---|
214 | } |
---|
215 | |
---|
216 | _arcs[n].prev_in = _arcs[n].prev_out = -1; |
---|
217 | |
---|
218 | _nodes[u.id].first_out = _nodes[v.id].first_in = n; |
---|
219 | |
---|
220 | return Arc(n); |
---|
221 | } |
---|
222 | |
---|
223 | void erase(const Node& node) { |
---|
224 | int n = node.id; |
---|
225 | |
---|
226 | if(_nodes[n].next != -1) { |
---|
227 | _nodes[_nodes[n].next].prev = _nodes[n].prev; |
---|
228 | } |
---|
229 | |
---|
230 | if(_nodes[n].prev != -1) { |
---|
231 | _nodes[_nodes[n].prev].next = _nodes[n].next; |
---|
232 | } else { |
---|
233 | first_node = _nodes[n].next; |
---|
234 | } |
---|
235 | |
---|
236 | _nodes[n].next = first_free_node; |
---|
237 | first_free_node = n; |
---|
238 | _nodes[n].prev = -2; |
---|
239 | |
---|
240 | } |
---|
241 | |
---|
242 | void erase(const Arc& arc) { |
---|
243 | int n = arc.id; |
---|
244 | |
---|
245 | if(_arcs[n].next_in!=-1) { |
---|
246 | _arcs[_arcs[n].next_in].prev_in = _arcs[n].prev_in; |
---|
247 | } |
---|
248 | |
---|
249 | if(_arcs[n].prev_in!=-1) { |
---|
250 | _arcs[_arcs[n].prev_in].next_in = _arcs[n].next_in; |
---|
251 | } else { |
---|
252 | _nodes[_arcs[n].target].first_in = _arcs[n].next_in; |
---|
253 | } |
---|
254 | |
---|
255 | |
---|
256 | if(_arcs[n].next_out!=-1) { |
---|
257 | _arcs[_arcs[n].next_out].prev_out = _arcs[n].prev_out; |
---|
258 | } |
---|
259 | |
---|
260 | if(_arcs[n].prev_out!=-1) { |
---|
261 | _arcs[_arcs[n].prev_out].next_out = _arcs[n].next_out; |
---|
262 | } else { |
---|
263 | _nodes[_arcs[n].source].first_out = _arcs[n].next_out; |
---|
264 | } |
---|
265 | |
---|
266 | _arcs[n].next_in = first_free_arc; |
---|
267 | first_free_arc = n; |
---|
268 | _arcs[n].prev_in = -2; |
---|
269 | } |
---|
270 | |
---|
271 | void clear() { |
---|
272 | _arcs.clear(); |
---|
273 | _nodes.clear(); |
---|
274 | first_node = first_free_node = first_free_arc = -1; |
---|
275 | } |
---|
276 | |
---|
277 | protected: |
---|
278 | void changeTarget(Arc e, Node n) |
---|
279 | { |
---|
280 | if(_arcs[e.id].next_in != -1) |
---|
281 | _arcs[_arcs[e.id].next_in].prev_in = _arcs[e.id].prev_in; |
---|
282 | if(_arcs[e.id].prev_in != -1) |
---|
283 | _arcs[_arcs[e.id].prev_in].next_in = _arcs[e.id].next_in; |
---|
284 | else _nodes[_arcs[e.id].target].first_in = _arcs[e.id].next_in; |
---|
285 | if (_nodes[n.id].first_in != -1) { |
---|
286 | _arcs[_nodes[n.id].first_in].prev_in = e.id; |
---|
287 | } |
---|
288 | _arcs[e.id].target = n.id; |
---|
289 | _arcs[e.id].prev_in = -1; |
---|
290 | _arcs[e.id].next_in = _nodes[n.id].first_in; |
---|
291 | _nodes[n.id].first_in = e.id; |
---|
292 | } |
---|
293 | void changeSource(Arc e, Node n) |
---|
294 | { |
---|
295 | if(_arcs[e.id].next_out != -1) |
---|
296 | _arcs[_arcs[e.id].next_out].prev_out = _arcs[e.id].prev_out; |
---|
297 | if(_arcs[e.id].prev_out != -1) |
---|
298 | _arcs[_arcs[e.id].prev_out].next_out = _arcs[e.id].next_out; |
---|
299 | else _nodes[_arcs[e.id].source].first_out = _arcs[e.id].next_out; |
---|
300 | if (_nodes[n.id].first_out != -1) { |
---|
301 | _arcs[_nodes[n.id].first_out].prev_out = e.id; |
---|
302 | } |
---|
303 | _arcs[e.id].source = n.id; |
---|
304 | _arcs[e.id].prev_out = -1; |
---|
305 | _arcs[e.id].next_out = _nodes[n.id].first_out; |
---|
306 | _nodes[n.id].first_out = e.id; |
---|
307 | } |
---|
308 | |
---|
309 | }; |
---|
310 | |
---|
311 | typedef DigraphExtender<ListDigraphBase> ExtendedListDigraphBase; |
---|
312 | |
---|
313 | /// \addtogroup graphs |
---|
314 | /// @{ |
---|
315 | |
---|
316 | ///A general directed graph structure. |
---|
317 | |
---|
318 | ///\ref ListDigraph is a versatile and fast directed graph |
---|
319 | ///implementation based on linked lists that are stored in |
---|
320 | ///\c std::vector structures. |
---|
321 | /// |
---|
322 | ///This type fully conforms to the \ref concepts::Digraph "Digraph concept" |
---|
323 | ///and it also provides several useful additional functionalities. |
---|
324 | ///Most of its member functions and nested classes are documented |
---|
325 | ///only in the concept class. |
---|
326 | /// |
---|
327 | ///This class provides only linear time counting for nodes and arcs. |
---|
328 | /// |
---|
329 | ///\sa concepts::Digraph |
---|
330 | ///\sa ListGraph |
---|
331 | class ListDigraph : public ExtendedListDigraphBase { |
---|
332 | typedef ExtendedListDigraphBase Parent; |
---|
333 | |
---|
334 | private: |
---|
335 | /// Digraphs are \e not copy constructible. Use DigraphCopy instead. |
---|
336 | ListDigraph(const ListDigraph &) :ExtendedListDigraphBase() {}; |
---|
337 | /// \brief Assignment of a digraph to another one is \e not allowed. |
---|
338 | /// Use DigraphCopy instead. |
---|
339 | void operator=(const ListDigraph &) {} |
---|
340 | public: |
---|
341 | |
---|
342 | /// Constructor |
---|
343 | |
---|
344 | /// Constructor. |
---|
345 | /// |
---|
346 | ListDigraph() {} |
---|
347 | |
---|
348 | ///Add a new node to the digraph. |
---|
349 | |
---|
350 | ///This function adds a new node to the digraph. |
---|
351 | ///\return The new node. |
---|
352 | Node addNode() { return Parent::addNode(); } |
---|
353 | |
---|
354 | ///Add a new arc to the digraph. |
---|
355 | |
---|
356 | ///This function adds a new arc to the digraph with source node \c s |
---|
357 | ///and target node \c t. |
---|
358 | ///\return The new arc. |
---|
359 | Arc addArc(Node s, Node t) { |
---|
360 | return Parent::addArc(s, t); |
---|
361 | } |
---|
362 | |
---|
363 | ///\brief Erase a node from the digraph. |
---|
364 | /// |
---|
365 | ///This function erases the given node along with its outgoing and |
---|
366 | ///incoming arcs from the digraph. |
---|
367 | /// |
---|
368 | ///\note All iterators referencing the removed node or the connected |
---|
369 | ///arcs are invalidated, of course. |
---|
370 | void erase(Node n) { Parent::erase(n); } |
---|
371 | |
---|
372 | ///\brief Erase an arc from the digraph. |
---|
373 | /// |
---|
374 | ///This function erases the given arc from the digraph. |
---|
375 | /// |
---|
376 | ///\note All iterators referencing the removed arc are invalidated, |
---|
377 | ///of course. |
---|
378 | void erase(Arc a) { Parent::erase(a); } |
---|
379 | |
---|
380 | /// Node validity check |
---|
381 | |
---|
382 | /// This function gives back \c true if the given node is valid, |
---|
383 | /// i.e. it is a real node of the digraph. |
---|
384 | /// |
---|
385 | /// \warning A removed node could become valid again if new nodes are |
---|
386 | /// added to the digraph. |
---|
387 | bool valid(Node n) const { return Parent::valid(n); } |
---|
388 | |
---|
389 | /// Arc validity check |
---|
390 | |
---|
391 | /// This function gives back \c true if the given arc is valid, |
---|
392 | /// i.e. it is a real arc of the digraph. |
---|
393 | /// |
---|
394 | /// \warning A removed arc could become valid again if new arcs are |
---|
395 | /// added to the digraph. |
---|
396 | bool valid(Arc a) const { return Parent::valid(a); } |
---|
397 | |
---|
398 | /// Change the target node of an arc |
---|
399 | |
---|
400 | /// This function changes the target node of the given arc \c a to \c n. |
---|
401 | /// |
---|
402 | ///\note \c ArcIt and \c OutArcIt iterators referencing the changed |
---|
403 | ///arc remain valid, but \c InArcIt iterators are invalidated. |
---|
404 | /// |
---|
405 | ///\warning This functionality cannot be used together with the Snapshot |
---|
406 | ///feature. |
---|
407 | void changeTarget(Arc a, Node n) { |
---|
408 | Parent::changeTarget(a,n); |
---|
409 | } |
---|
410 | /// Change the source node of an arc |
---|
411 | |
---|
412 | /// This function changes the source node of the given arc \c a to \c n. |
---|
413 | /// |
---|
414 | ///\note \c InArcIt iterators referencing the changed arc remain |
---|
415 | ///valid, but \c ArcIt and \c OutArcIt iterators are invalidated. |
---|
416 | /// |
---|
417 | ///\warning This functionality cannot be used together with the Snapshot |
---|
418 | ///feature. |
---|
419 | void changeSource(Arc a, Node n) { |
---|
420 | Parent::changeSource(a,n); |
---|
421 | } |
---|
422 | |
---|
423 | /// Reverse the direction of an arc. |
---|
424 | |
---|
425 | /// This function reverses the direction of the given arc. |
---|
426 | ///\note \c ArcIt, \c OutArcIt and \c InArcIt iterators referencing |
---|
427 | ///the changed arc are invalidated. |
---|
428 | /// |
---|
429 | ///\warning This functionality cannot be used together with the Snapshot |
---|
430 | ///feature. |
---|
431 | void reverseArc(Arc a) { |
---|
432 | Node t=target(a); |
---|
433 | changeTarget(a,source(a)); |
---|
434 | changeSource(a,t); |
---|
435 | } |
---|
436 | |
---|
437 | ///Contract two nodes. |
---|
438 | |
---|
439 | ///This function contracts the given two nodes. |
---|
440 | ///Node \c v is removed, but instead of deleting its |
---|
441 | ///incident arcs, they are joined to node \c u. |
---|
442 | ///If the last parameter \c r is \c true (this is the default value), |
---|
443 | ///then the newly created loops are removed. |
---|
444 | /// |
---|
445 | ///\note The moved arcs are joined to node \c u using changeSource() |
---|
446 | ///or changeTarget(), thus \c ArcIt and \c OutArcIt iterators are |
---|
447 | ///invalidated for the outgoing arcs of node \c v and \c InArcIt |
---|
448 | ///iterators are invalidated for the incoming arcs of \c v. |
---|
449 | ///Moreover all iterators referencing node \c v or the removed |
---|
450 | ///loops are also invalidated. Other iterators remain valid. |
---|
451 | /// |
---|
452 | ///\warning This functionality cannot be used together with the Snapshot |
---|
453 | ///feature. |
---|
454 | void contract(Node u, Node v, bool r = true) |
---|
455 | { |
---|
456 | for(OutArcIt e(*this,v);e!=INVALID;) { |
---|
457 | OutArcIt f=e; |
---|
458 | ++f; |
---|
459 | if(r && target(e)==u) erase(e); |
---|
460 | else changeSource(e,u); |
---|
461 | e=f; |
---|
462 | } |
---|
463 | for(InArcIt e(*this,v);e!=INVALID;) { |
---|
464 | InArcIt f=e; |
---|
465 | ++f; |
---|
466 | if(r && source(e)==u) erase(e); |
---|
467 | else changeTarget(e,u); |
---|
468 | e=f; |
---|
469 | } |
---|
470 | erase(v); |
---|
471 | } |
---|
472 | |
---|
473 | ///Split a node. |
---|
474 | |
---|
475 | ///This function splits the given node. First, a new node is added |
---|
476 | ///to the digraph, then the source of each outgoing arc of node \c n |
---|
477 | ///is moved to this new node. |
---|
478 | ///If the second parameter \c connect is \c true (this is the default |
---|
479 | ///value), then a new arc from node \c n to the newly created node |
---|
480 | ///is also added. |
---|
481 | ///\return The newly created node. |
---|
482 | /// |
---|
483 | ///\note All iterators remain valid. |
---|
484 | /// |
---|
485 | ///\warning This functionality cannot be used together with the |
---|
486 | ///Snapshot feature. |
---|
487 | Node split(Node n, bool connect = true) { |
---|
488 | Node b = addNode(); |
---|
489 | _nodes[b.id].first_out=_nodes[n.id].first_out; |
---|
490 | _nodes[n.id].first_out=-1; |
---|
491 | for(int i=_nodes[b.id].first_out; i!=-1; i=_arcs[i].next_out) { |
---|
492 | _arcs[i].source=b.id; |
---|
493 | } |
---|
494 | if (connect) addArc(n,b); |
---|
495 | return b; |
---|
496 | } |
---|
497 | |
---|
498 | ///Split an arc. |
---|
499 | |
---|
500 | ///This function splits the given arc. First, a new node \c v is |
---|
501 | ///added to the digraph, then the target node of the original arc |
---|
502 | ///is set to \c v. Finally, an arc from \c v to the original target |
---|
503 | ///is added. |
---|
504 | ///\return The newly created node. |
---|
505 | /// |
---|
506 | ///\note \c InArcIt iterators referencing the original arc are |
---|
507 | ///invalidated. Other iterators remain valid. |
---|
508 | /// |
---|
509 | ///\warning This functionality cannot be used together with the |
---|
510 | ///Snapshot feature. |
---|
511 | Node split(Arc a) { |
---|
512 | Node v = addNode(); |
---|
513 | addArc(v,target(a)); |
---|
514 | changeTarget(a,v); |
---|
515 | return v; |
---|
516 | } |
---|
517 | |
---|
518 | ///Clear the digraph. |
---|
519 | |
---|
520 | ///This function erases all nodes and arcs from the digraph. |
---|
521 | /// |
---|
522 | ///\note All iterators of the digraph are invalidated, of course. |
---|
523 | void clear() { |
---|
524 | Parent::clear(); |
---|
525 | } |
---|
526 | |
---|
527 | /// Reserve memory for nodes. |
---|
528 | |
---|
529 | /// Using this function, it is possible to avoid superfluous memory |
---|
530 | /// allocation: if you know that the digraph you want to build will |
---|
531 | /// be large (e.g. it will contain millions of nodes and/or arcs), |
---|
532 | /// then it is worth reserving space for this amount before starting |
---|
533 | /// to build the digraph. |
---|
534 | /// \sa reserveArc() |
---|
535 | void reserveNode(int n) { _nodes.reserve(n); }; |
---|
536 | |
---|
537 | /// Reserve memory for arcs. |
---|
538 | |
---|
539 | /// Using this function, it is possible to avoid superfluous memory |
---|
540 | /// allocation: if you know that the digraph you want to build will |
---|
541 | /// be large (e.g. it will contain millions of nodes and/or arcs), |
---|
542 | /// then it is worth reserving space for this amount before starting |
---|
543 | /// to build the digraph. |
---|
544 | /// \sa reserveNode() |
---|
545 | void reserveArc(int m) { _arcs.reserve(m); }; |
---|
546 | |
---|
547 | /// \brief Class to make a snapshot of the digraph and restore |
---|
548 | /// it later. |
---|
549 | /// |
---|
550 | /// Class to make a snapshot of the digraph and restore it later. |
---|
551 | /// |
---|
552 | /// The newly added nodes and arcs can be removed using the |
---|
553 | /// restore() function. |
---|
554 | /// |
---|
555 | /// \note After a state is restored, you cannot restore a later state, |
---|
556 | /// i.e. you cannot add the removed nodes and arcs again using |
---|
557 | /// another Snapshot instance. |
---|
558 | /// |
---|
559 | /// \warning Node and arc deletions and other modifications (e.g. |
---|
560 | /// reversing, contracting, splitting arcs or nodes) cannot be |
---|
561 | /// restored. These events invalidate the snapshot. |
---|
562 | /// However, the arcs and nodes that were added to the digraph after |
---|
563 | /// making the current snapshot can be removed without invalidating it. |
---|
564 | class Snapshot { |
---|
565 | protected: |
---|
566 | |
---|
567 | typedef Parent::NodeNotifier NodeNotifier; |
---|
568 | |
---|
569 | class NodeObserverProxy : public NodeNotifier::ObserverBase { |
---|
570 | public: |
---|
571 | |
---|
572 | NodeObserverProxy(Snapshot& _snapshot) |
---|
573 | : snapshot(_snapshot) {} |
---|
574 | |
---|
575 | using NodeNotifier::ObserverBase::attach; |
---|
576 | using NodeNotifier::ObserverBase::detach; |
---|
577 | using NodeNotifier::ObserverBase::attached; |
---|
578 | |
---|
579 | protected: |
---|
580 | |
---|
581 | virtual void add(const Node& node) { |
---|
582 | snapshot.addNode(node); |
---|
583 | } |
---|
584 | virtual void add(const std::vector<Node>& nodes) { |
---|
585 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
586 | snapshot.addNode(nodes[i]); |
---|
587 | } |
---|
588 | } |
---|
589 | virtual void erase(const Node& node) { |
---|
590 | snapshot.eraseNode(node); |
---|
591 | } |
---|
592 | virtual void erase(const std::vector<Node>& nodes) { |
---|
593 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
594 | snapshot.eraseNode(nodes[i]); |
---|
595 | } |
---|
596 | } |
---|
597 | virtual void build() { |
---|
598 | Node node; |
---|
599 | std::vector<Node> nodes; |
---|
600 | for (notifier()->first(node); node != INVALID; |
---|
601 | notifier()->next(node)) { |
---|
602 | nodes.push_back(node); |
---|
603 | } |
---|
604 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
605 | snapshot.addNode(nodes[i]); |
---|
606 | } |
---|
607 | } |
---|
608 | virtual void clear() { |
---|
609 | Node node; |
---|
610 | for (notifier()->first(node); node != INVALID; |
---|
611 | notifier()->next(node)) { |
---|
612 | snapshot.eraseNode(node); |
---|
613 | } |
---|
614 | } |
---|
615 | |
---|
616 | Snapshot& snapshot; |
---|
617 | }; |
---|
618 | |
---|
619 | class ArcObserverProxy : public ArcNotifier::ObserverBase { |
---|
620 | public: |
---|
621 | |
---|
622 | ArcObserverProxy(Snapshot& _snapshot) |
---|
623 | : snapshot(_snapshot) {} |
---|
624 | |
---|
625 | using ArcNotifier::ObserverBase::attach; |
---|
626 | using ArcNotifier::ObserverBase::detach; |
---|
627 | using ArcNotifier::ObserverBase::attached; |
---|
628 | |
---|
629 | protected: |
---|
630 | |
---|
631 | virtual void add(const Arc& arc) { |
---|
632 | snapshot.addArc(arc); |
---|
633 | } |
---|
634 | virtual void add(const std::vector<Arc>& arcs) { |
---|
635 | for (int i = arcs.size() - 1; i >= 0; --i) { |
---|
636 | snapshot.addArc(arcs[i]); |
---|
637 | } |
---|
638 | } |
---|
639 | virtual void erase(const Arc& arc) { |
---|
640 | snapshot.eraseArc(arc); |
---|
641 | } |
---|
642 | virtual void erase(const std::vector<Arc>& arcs) { |
---|
643 | for (int i = 0; i < int(arcs.size()); ++i) { |
---|
644 | snapshot.eraseArc(arcs[i]); |
---|
645 | } |
---|
646 | } |
---|
647 | virtual void build() { |
---|
648 | Arc arc; |
---|
649 | std::vector<Arc> arcs; |
---|
650 | for (notifier()->first(arc); arc != INVALID; |
---|
651 | notifier()->next(arc)) { |
---|
652 | arcs.push_back(arc); |
---|
653 | } |
---|
654 | for (int i = arcs.size() - 1; i >= 0; --i) { |
---|
655 | snapshot.addArc(arcs[i]); |
---|
656 | } |
---|
657 | } |
---|
658 | virtual void clear() { |
---|
659 | Arc arc; |
---|
660 | for (notifier()->first(arc); arc != INVALID; |
---|
661 | notifier()->next(arc)) { |
---|
662 | snapshot.eraseArc(arc); |
---|
663 | } |
---|
664 | } |
---|
665 | |
---|
666 | Snapshot& snapshot; |
---|
667 | }; |
---|
668 | |
---|
669 | ListDigraph *digraph; |
---|
670 | |
---|
671 | NodeObserverProxy node_observer_proxy; |
---|
672 | ArcObserverProxy arc_observer_proxy; |
---|
673 | |
---|
674 | std::list<Node> added_nodes; |
---|
675 | std::list<Arc> added_arcs; |
---|
676 | |
---|
677 | |
---|
678 | void addNode(const Node& node) { |
---|
679 | added_nodes.push_front(node); |
---|
680 | } |
---|
681 | void eraseNode(const Node& node) { |
---|
682 | std::list<Node>::iterator it = |
---|
683 | std::find(added_nodes.begin(), added_nodes.end(), node); |
---|
684 | if (it == added_nodes.end()) { |
---|
685 | clear(); |
---|
686 | arc_observer_proxy.detach(); |
---|
687 | throw NodeNotifier::ImmediateDetach(); |
---|
688 | } else { |
---|
689 | added_nodes.erase(it); |
---|
690 | } |
---|
691 | } |
---|
692 | |
---|
693 | void addArc(const Arc& arc) { |
---|
694 | added_arcs.push_front(arc); |
---|
695 | } |
---|
696 | void eraseArc(const Arc& arc) { |
---|
697 | std::list<Arc>::iterator it = |
---|
698 | std::find(added_arcs.begin(), added_arcs.end(), arc); |
---|
699 | if (it == added_arcs.end()) { |
---|
700 | clear(); |
---|
701 | node_observer_proxy.detach(); |
---|
702 | throw ArcNotifier::ImmediateDetach(); |
---|
703 | } else { |
---|
704 | added_arcs.erase(it); |
---|
705 | } |
---|
706 | } |
---|
707 | |
---|
708 | void attach(ListDigraph &_digraph) { |
---|
709 | digraph = &_digraph; |
---|
710 | node_observer_proxy.attach(digraph->notifier(Node())); |
---|
711 | arc_observer_proxy.attach(digraph->notifier(Arc())); |
---|
712 | } |
---|
713 | |
---|
714 | void detach() { |
---|
715 | node_observer_proxy.detach(); |
---|
716 | arc_observer_proxy.detach(); |
---|
717 | } |
---|
718 | |
---|
719 | bool attached() const { |
---|
720 | return node_observer_proxy.attached(); |
---|
721 | } |
---|
722 | |
---|
723 | void clear() { |
---|
724 | added_nodes.clear(); |
---|
725 | added_arcs.clear(); |
---|
726 | } |
---|
727 | |
---|
728 | public: |
---|
729 | |
---|
730 | /// \brief Default constructor. |
---|
731 | /// |
---|
732 | /// Default constructor. |
---|
733 | /// You have to call save() to actually make a snapshot. |
---|
734 | Snapshot() |
---|
735 | : digraph(0), node_observer_proxy(*this), |
---|
736 | arc_observer_proxy(*this) {} |
---|
737 | |
---|
738 | /// \brief Constructor that immediately makes a snapshot. |
---|
739 | /// |
---|
740 | /// This constructor immediately makes a snapshot of the given digraph. |
---|
741 | Snapshot(ListDigraph &gr) |
---|
742 | : node_observer_proxy(*this), |
---|
743 | arc_observer_proxy(*this) { |
---|
744 | attach(gr); |
---|
745 | } |
---|
746 | |
---|
747 | /// \brief Make a snapshot. |
---|
748 | /// |
---|
749 | /// This function makes a snapshot of the given digraph. |
---|
750 | /// It can be called more than once. In case of a repeated |
---|
751 | /// call, the previous snapshot gets lost. |
---|
752 | void save(ListDigraph &gr) { |
---|
753 | if (attached()) { |
---|
754 | detach(); |
---|
755 | clear(); |
---|
756 | } |
---|
757 | attach(gr); |
---|
758 | } |
---|
759 | |
---|
760 | /// \brief Undo the changes until the last snapshot. |
---|
761 | /// |
---|
762 | /// This function undos the changes until the last snapshot |
---|
763 | /// created by save() or Snapshot(ListDigraph&). |
---|
764 | /// |
---|
765 | /// \warning This method invalidates the snapshot, i.e. repeated |
---|
766 | /// restoring is not supported unless you call save() again. |
---|
767 | void restore() { |
---|
768 | detach(); |
---|
769 | for(std::list<Arc>::iterator it = added_arcs.begin(); |
---|
770 | it != added_arcs.end(); ++it) { |
---|
771 | digraph->erase(*it); |
---|
772 | } |
---|
773 | for(std::list<Node>::iterator it = added_nodes.begin(); |
---|
774 | it != added_nodes.end(); ++it) { |
---|
775 | digraph->erase(*it); |
---|
776 | } |
---|
777 | clear(); |
---|
778 | } |
---|
779 | |
---|
780 | /// \brief Returns \c true if the snapshot is valid. |
---|
781 | /// |
---|
782 | /// This function returns \c true if the snapshot is valid. |
---|
783 | bool valid() const { |
---|
784 | return attached(); |
---|
785 | } |
---|
786 | }; |
---|
787 | |
---|
788 | }; |
---|
789 | |
---|
790 | ///@} |
---|
791 | |
---|
792 | class ListGraphBase { |
---|
793 | |
---|
794 | protected: |
---|
795 | |
---|
796 | struct NodeT { |
---|
797 | int first_out; |
---|
798 | int prev, next; |
---|
799 | }; |
---|
800 | |
---|
801 | struct ArcT { |
---|
802 | int target; |
---|
803 | int prev_out, next_out; |
---|
804 | }; |
---|
805 | |
---|
806 | std::vector<NodeT> _nodes; |
---|
807 | |
---|
808 | int first_node; |
---|
809 | |
---|
810 | int first_free_node; |
---|
811 | |
---|
812 | std::vector<ArcT> _arcs; |
---|
813 | |
---|
814 | int first_free_arc; |
---|
815 | |
---|
816 | public: |
---|
817 | |
---|
818 | typedef ListGraphBase Graph; |
---|
819 | |
---|
820 | class Node { |
---|
821 | friend class ListGraphBase; |
---|
822 | protected: |
---|
823 | |
---|
824 | int id; |
---|
825 | explicit Node(int pid) { id = pid;} |
---|
826 | |
---|
827 | public: |
---|
828 | Node() {} |
---|
829 | Node (Invalid) { id = -1; } |
---|
830 | bool operator==(const Node& node) const {return id == node.id;} |
---|
831 | bool operator!=(const Node& node) const {return id != node.id;} |
---|
832 | bool operator<(const Node& node) const {return id < node.id;} |
---|
833 | }; |
---|
834 | |
---|
835 | class Edge { |
---|
836 | friend class ListGraphBase; |
---|
837 | protected: |
---|
838 | |
---|
839 | int id; |
---|
840 | explicit Edge(int pid) { id = pid;} |
---|
841 | |
---|
842 | public: |
---|
843 | Edge() {} |
---|
844 | Edge (Invalid) { id = -1; } |
---|
845 | bool operator==(const Edge& edge) const {return id == edge.id;} |
---|
846 | bool operator!=(const Edge& edge) const {return id != edge.id;} |
---|
847 | bool operator<(const Edge& edge) const {return id < edge.id;} |
---|
848 | }; |
---|
849 | |
---|
850 | class Arc { |
---|
851 | friend class ListGraphBase; |
---|
852 | protected: |
---|
853 | |
---|
854 | int id; |
---|
855 | explicit Arc(int pid) { id = pid;} |
---|
856 | |
---|
857 | public: |
---|
858 | operator Edge() const { |
---|
859 | return id != -1 ? edgeFromId(id / 2) : INVALID; |
---|
860 | } |
---|
861 | |
---|
862 | Arc() {} |
---|
863 | Arc (Invalid) { id = -1; } |
---|
864 | bool operator==(const Arc& arc) const {return id == arc.id;} |
---|
865 | bool operator!=(const Arc& arc) const {return id != arc.id;} |
---|
866 | bool operator<(const Arc& arc) const {return id < arc.id;} |
---|
867 | }; |
---|
868 | |
---|
869 | ListGraphBase() |
---|
870 | : _nodes(), first_node(-1), |
---|
871 | first_free_node(-1), _arcs(), first_free_arc(-1) {} |
---|
872 | |
---|
873 | |
---|
874 | int maxNodeId() const { return _nodes.size()-1; } |
---|
875 | int maxEdgeId() const { return _arcs.size() / 2 - 1; } |
---|
876 | int maxArcId() const { return _arcs.size()-1; } |
---|
877 | |
---|
878 | Node source(Arc e) const { return Node(_arcs[e.id ^ 1].target); } |
---|
879 | Node target(Arc e) const { return Node(_arcs[e.id].target); } |
---|
880 | |
---|
881 | Node u(Edge e) const { return Node(_arcs[2 * e.id].target); } |
---|
882 | Node v(Edge e) const { return Node(_arcs[2 * e.id + 1].target); } |
---|
883 | |
---|
884 | static bool direction(Arc e) { |
---|
885 | return (e.id & 1) == 1; |
---|
886 | } |
---|
887 | |
---|
888 | static Arc direct(Edge e, bool d) { |
---|
889 | return Arc(e.id * 2 + (d ? 1 : 0)); |
---|
890 | } |
---|
891 | |
---|
892 | void first(Node& node) const { |
---|
893 | node.id = first_node; |
---|
894 | } |
---|
895 | |
---|
896 | void next(Node& node) const { |
---|
897 | node.id = _nodes[node.id].next; |
---|
898 | } |
---|
899 | |
---|
900 | void first(Arc& e) const { |
---|
901 | int n = first_node; |
---|
902 | while (n != -1 && _nodes[n].first_out == -1) { |
---|
903 | n = _nodes[n].next; |
---|
904 | } |
---|
905 | e.id = (n == -1) ? -1 : _nodes[n].first_out; |
---|
906 | } |
---|
907 | |
---|
908 | void next(Arc& e) const { |
---|
909 | if (_arcs[e.id].next_out != -1) { |
---|
910 | e.id = _arcs[e.id].next_out; |
---|
911 | } else { |
---|
912 | int n = _nodes[_arcs[e.id ^ 1].target].next; |
---|
913 | while(n != -1 && _nodes[n].first_out == -1) { |
---|
914 | n = _nodes[n].next; |
---|
915 | } |
---|
916 | e.id = (n == -1) ? -1 : _nodes[n].first_out; |
---|
917 | } |
---|
918 | } |
---|
919 | |
---|
920 | void first(Edge& e) const { |
---|
921 | int n = first_node; |
---|
922 | while (n != -1) { |
---|
923 | e.id = _nodes[n].first_out; |
---|
924 | while ((e.id & 1) != 1) { |
---|
925 | e.id = _arcs[e.id].next_out; |
---|
926 | } |
---|
927 | if (e.id != -1) { |
---|
928 | e.id /= 2; |
---|
929 | return; |
---|
930 | } |
---|
931 | n = _nodes[n].next; |
---|
932 | } |
---|
933 | e.id = -1; |
---|
934 | } |
---|
935 | |
---|
936 | void next(Edge& e) const { |
---|
937 | int n = _arcs[e.id * 2].target; |
---|
938 | e.id = _arcs[(e.id * 2) | 1].next_out; |
---|
939 | while ((e.id & 1) != 1) { |
---|
940 | e.id = _arcs[e.id].next_out; |
---|
941 | } |
---|
942 | if (e.id != -1) { |
---|
943 | e.id /= 2; |
---|
944 | return; |
---|
945 | } |
---|
946 | n = _nodes[n].next; |
---|
947 | while (n != -1) { |
---|
948 | e.id = _nodes[n].first_out; |
---|
949 | while ((e.id & 1) != 1) { |
---|
950 | e.id = _arcs[e.id].next_out; |
---|
951 | } |
---|
952 | if (e.id != -1) { |
---|
953 | e.id /= 2; |
---|
954 | return; |
---|
955 | } |
---|
956 | n = _nodes[n].next; |
---|
957 | } |
---|
958 | e.id = -1; |
---|
959 | } |
---|
960 | |
---|
961 | void firstOut(Arc &e, const Node& v) const { |
---|
962 | e.id = _nodes[v.id].first_out; |
---|
963 | } |
---|
964 | void nextOut(Arc &e) const { |
---|
965 | e.id = _arcs[e.id].next_out; |
---|
966 | } |
---|
967 | |
---|
968 | void firstIn(Arc &e, const Node& v) const { |
---|
969 | e.id = ((_nodes[v.id].first_out) ^ 1); |
---|
970 | if (e.id == -2) e.id = -1; |
---|
971 | } |
---|
972 | void nextIn(Arc &e) const { |
---|
973 | e.id = ((_arcs[e.id ^ 1].next_out) ^ 1); |
---|
974 | if (e.id == -2) e.id = -1; |
---|
975 | } |
---|
976 | |
---|
977 | void firstInc(Edge &e, bool& d, const Node& v) const { |
---|
978 | int a = _nodes[v.id].first_out; |
---|
979 | if (a != -1 ) { |
---|
980 | e.id = a / 2; |
---|
981 | d = ((a & 1) == 1); |
---|
982 | } else { |
---|
983 | e.id = -1; |
---|
984 | d = true; |
---|
985 | } |
---|
986 | } |
---|
987 | void nextInc(Edge &e, bool& d) const { |
---|
988 | int a = (_arcs[(e.id * 2) | (d ? 1 : 0)].next_out); |
---|
989 | if (a != -1 ) { |
---|
990 | e.id = a / 2; |
---|
991 | d = ((a & 1) == 1); |
---|
992 | } else { |
---|
993 | e.id = -1; |
---|
994 | d = true; |
---|
995 | } |
---|
996 | } |
---|
997 | |
---|
998 | static int id(Node v) { return v.id; } |
---|
999 | static int id(Arc e) { return e.id; } |
---|
1000 | static int id(Edge e) { return e.id; } |
---|
1001 | |
---|
1002 | static Node nodeFromId(int id) { return Node(id);} |
---|
1003 | static Arc arcFromId(int id) { return Arc(id);} |
---|
1004 | static Edge edgeFromId(int id) { return Edge(id);} |
---|
1005 | |
---|
1006 | bool valid(Node n) const { |
---|
1007 | return n.id >= 0 && n.id < static_cast<int>(_nodes.size()) && |
---|
1008 | _nodes[n.id].prev != -2; |
---|
1009 | } |
---|
1010 | |
---|
1011 | bool valid(Arc a) const { |
---|
1012 | return a.id >= 0 && a.id < static_cast<int>(_arcs.size()) && |
---|
1013 | _arcs[a.id].prev_out != -2; |
---|
1014 | } |
---|
1015 | |
---|
1016 | bool valid(Edge e) const { |
---|
1017 | return e.id >= 0 && 2 * e.id < static_cast<int>(_arcs.size()) && |
---|
1018 | _arcs[2 * e.id].prev_out != -2; |
---|
1019 | } |
---|
1020 | |
---|
1021 | Node addNode() { |
---|
1022 | int n; |
---|
1023 | |
---|
1024 | if(first_free_node==-1) { |
---|
1025 | n = _nodes.size(); |
---|
1026 | _nodes.push_back(NodeT()); |
---|
1027 | } else { |
---|
1028 | n = first_free_node; |
---|
1029 | first_free_node = _nodes[n].next; |
---|
1030 | } |
---|
1031 | |
---|
1032 | _nodes[n].next = first_node; |
---|
1033 | if (first_node != -1) _nodes[first_node].prev = n; |
---|
1034 | first_node = n; |
---|
1035 | _nodes[n].prev = -1; |
---|
1036 | |
---|
1037 | _nodes[n].first_out = -1; |
---|
1038 | |
---|
1039 | return Node(n); |
---|
1040 | } |
---|
1041 | |
---|
1042 | Edge addEdge(Node u, Node v) { |
---|
1043 | int n; |
---|
1044 | |
---|
1045 | if (first_free_arc == -1) { |
---|
1046 | n = _arcs.size(); |
---|
1047 | _arcs.push_back(ArcT()); |
---|
1048 | _arcs.push_back(ArcT()); |
---|
1049 | } else { |
---|
1050 | n = first_free_arc; |
---|
1051 | first_free_arc = _arcs[n].next_out; |
---|
1052 | } |
---|
1053 | |
---|
1054 | _arcs[n].target = u.id; |
---|
1055 | _arcs[n | 1].target = v.id; |
---|
1056 | |
---|
1057 | _arcs[n].next_out = _nodes[v.id].first_out; |
---|
1058 | if (_nodes[v.id].first_out != -1) { |
---|
1059 | _arcs[_nodes[v.id].first_out].prev_out = n; |
---|
1060 | } |
---|
1061 | _arcs[n].prev_out = -1; |
---|
1062 | _nodes[v.id].first_out = n; |
---|
1063 | |
---|
1064 | _arcs[n | 1].next_out = _nodes[u.id].first_out; |
---|
1065 | if (_nodes[u.id].first_out != -1) { |
---|
1066 | _arcs[_nodes[u.id].first_out].prev_out = (n | 1); |
---|
1067 | } |
---|
1068 | _arcs[n | 1].prev_out = -1; |
---|
1069 | _nodes[u.id].first_out = (n | 1); |
---|
1070 | |
---|
1071 | return Edge(n / 2); |
---|
1072 | } |
---|
1073 | |
---|
1074 | void erase(const Node& node) { |
---|
1075 | int n = node.id; |
---|
1076 | |
---|
1077 | if(_nodes[n].next != -1) { |
---|
1078 | _nodes[_nodes[n].next].prev = _nodes[n].prev; |
---|
1079 | } |
---|
1080 | |
---|
1081 | if(_nodes[n].prev != -1) { |
---|
1082 | _nodes[_nodes[n].prev].next = _nodes[n].next; |
---|
1083 | } else { |
---|
1084 | first_node = _nodes[n].next; |
---|
1085 | } |
---|
1086 | |
---|
1087 | _nodes[n].next = first_free_node; |
---|
1088 | first_free_node = n; |
---|
1089 | _nodes[n].prev = -2; |
---|
1090 | } |
---|
1091 | |
---|
1092 | void erase(const Edge& edge) { |
---|
1093 | int n = edge.id * 2; |
---|
1094 | |
---|
1095 | if (_arcs[n].next_out != -1) { |
---|
1096 | _arcs[_arcs[n].next_out].prev_out = _arcs[n].prev_out; |
---|
1097 | } |
---|
1098 | |
---|
1099 | if (_arcs[n].prev_out != -1) { |
---|
1100 | _arcs[_arcs[n].prev_out].next_out = _arcs[n].next_out; |
---|
1101 | } else { |
---|
1102 | _nodes[_arcs[n | 1].target].first_out = _arcs[n].next_out; |
---|
1103 | } |
---|
1104 | |
---|
1105 | if (_arcs[n | 1].next_out != -1) { |
---|
1106 | _arcs[_arcs[n | 1].next_out].prev_out = _arcs[n | 1].prev_out; |
---|
1107 | } |
---|
1108 | |
---|
1109 | if (_arcs[n | 1].prev_out != -1) { |
---|
1110 | _arcs[_arcs[n | 1].prev_out].next_out = _arcs[n | 1].next_out; |
---|
1111 | } else { |
---|
1112 | _nodes[_arcs[n].target].first_out = _arcs[n | 1].next_out; |
---|
1113 | } |
---|
1114 | |
---|
1115 | _arcs[n].next_out = first_free_arc; |
---|
1116 | first_free_arc = n; |
---|
1117 | _arcs[n].prev_out = -2; |
---|
1118 | _arcs[n | 1].prev_out = -2; |
---|
1119 | |
---|
1120 | } |
---|
1121 | |
---|
1122 | void clear() { |
---|
1123 | _arcs.clear(); |
---|
1124 | _nodes.clear(); |
---|
1125 | first_node = first_free_node = first_free_arc = -1; |
---|
1126 | } |
---|
1127 | |
---|
1128 | protected: |
---|
1129 | |
---|
1130 | void changeV(Edge e, Node n) { |
---|
1131 | if(_arcs[2 * e.id].next_out != -1) { |
---|
1132 | _arcs[_arcs[2 * e.id].next_out].prev_out = _arcs[2 * e.id].prev_out; |
---|
1133 | } |
---|
1134 | if(_arcs[2 * e.id].prev_out != -1) { |
---|
1135 | _arcs[_arcs[2 * e.id].prev_out].next_out = |
---|
1136 | _arcs[2 * e.id].next_out; |
---|
1137 | } else { |
---|
1138 | _nodes[_arcs[(2 * e.id) | 1].target].first_out = |
---|
1139 | _arcs[2 * e.id].next_out; |
---|
1140 | } |
---|
1141 | |
---|
1142 | if (_nodes[n.id].first_out != -1) { |
---|
1143 | _arcs[_nodes[n.id].first_out].prev_out = 2 * e.id; |
---|
1144 | } |
---|
1145 | _arcs[(2 * e.id) | 1].target = n.id; |
---|
1146 | _arcs[2 * e.id].prev_out = -1; |
---|
1147 | _arcs[2 * e.id].next_out = _nodes[n.id].first_out; |
---|
1148 | _nodes[n.id].first_out = 2 * e.id; |
---|
1149 | } |
---|
1150 | |
---|
1151 | void changeU(Edge e, Node n) { |
---|
1152 | if(_arcs[(2 * e.id) | 1].next_out != -1) { |
---|
1153 | _arcs[_arcs[(2 * e.id) | 1].next_out].prev_out = |
---|
1154 | _arcs[(2 * e.id) | 1].prev_out; |
---|
1155 | } |
---|
1156 | if(_arcs[(2 * e.id) | 1].prev_out != -1) { |
---|
1157 | _arcs[_arcs[(2 * e.id) | 1].prev_out].next_out = |
---|
1158 | _arcs[(2 * e.id) | 1].next_out; |
---|
1159 | } else { |
---|
1160 | _nodes[_arcs[2 * e.id].target].first_out = |
---|
1161 | _arcs[(2 * e.id) | 1].next_out; |
---|
1162 | } |
---|
1163 | |
---|
1164 | if (_nodes[n.id].first_out != -1) { |
---|
1165 | _arcs[_nodes[n.id].first_out].prev_out = ((2 * e.id) | 1); |
---|
1166 | } |
---|
1167 | _arcs[2 * e.id].target = n.id; |
---|
1168 | _arcs[(2 * e.id) | 1].prev_out = -1; |
---|
1169 | _arcs[(2 * e.id) | 1].next_out = _nodes[n.id].first_out; |
---|
1170 | _nodes[n.id].first_out = ((2 * e.id) | 1); |
---|
1171 | } |
---|
1172 | |
---|
1173 | }; |
---|
1174 | |
---|
1175 | typedef GraphExtender<ListGraphBase> ExtendedListGraphBase; |
---|
1176 | |
---|
1177 | |
---|
1178 | /// \addtogroup graphs |
---|
1179 | /// @{ |
---|
1180 | |
---|
1181 | ///A general undirected graph structure. |
---|
1182 | |
---|
1183 | ///\ref ListGraph is a versatile and fast undirected graph |
---|
1184 | ///implementation based on linked lists that are stored in |
---|
1185 | ///\c std::vector structures. |
---|
1186 | /// |
---|
1187 | ///This type fully conforms to the \ref concepts::Graph "Graph concept" |
---|
1188 | ///and it also provides several useful additional functionalities. |
---|
1189 | ///Most of its member functions and nested classes are documented |
---|
1190 | ///only in the concept class. |
---|
1191 | /// |
---|
1192 | ///This class provides only linear time counting for nodes, edges and arcs. |
---|
1193 | /// |
---|
1194 | ///\sa concepts::Graph |
---|
1195 | ///\sa ListDigraph |
---|
1196 | class ListGraph : public ExtendedListGraphBase { |
---|
1197 | typedef ExtendedListGraphBase Parent; |
---|
1198 | |
---|
1199 | private: |
---|
1200 | /// Graphs are \e not copy constructible. Use GraphCopy instead. |
---|
1201 | ListGraph(const ListGraph &) :ExtendedListGraphBase() {}; |
---|
1202 | /// \brief Assignment of a graph to another one is \e not allowed. |
---|
1203 | /// Use GraphCopy instead. |
---|
1204 | void operator=(const ListGraph &) {} |
---|
1205 | public: |
---|
1206 | /// Constructor |
---|
1207 | |
---|
1208 | /// Constructor. |
---|
1209 | /// |
---|
1210 | ListGraph() {} |
---|
1211 | |
---|
1212 | typedef Parent::IncEdgeIt IncEdgeIt; |
---|
1213 | |
---|
1214 | /// \brief Add a new node to the graph. |
---|
1215 | /// |
---|
1216 | /// This function adds a new node to the graph. |
---|
1217 | /// \return The new node. |
---|
1218 | Node addNode() { return Parent::addNode(); } |
---|
1219 | |
---|
1220 | /// \brief Add a new edge to the graph. |
---|
1221 | /// |
---|
1222 | /// This function adds a new edge to the graph between nodes |
---|
1223 | /// \c u and \c v with inherent orientation from node \c u to |
---|
1224 | /// node \c v. |
---|
1225 | /// \return The new edge. |
---|
1226 | Edge addEdge(Node u, Node v) { |
---|
1227 | return Parent::addEdge(u, v); |
---|
1228 | } |
---|
1229 | |
---|
1230 | ///\brief Erase a node from the graph. |
---|
1231 | /// |
---|
1232 | /// This function erases the given node along with its incident arcs |
---|
1233 | /// from the graph. |
---|
1234 | /// |
---|
1235 | /// \note All iterators referencing the removed node or the incident |
---|
1236 | /// edges are invalidated, of course. |
---|
1237 | void erase(Node n) { Parent::erase(n); } |
---|
1238 | |
---|
1239 | ///\brief Erase an edge from the graph. |
---|
1240 | /// |
---|
1241 | /// This function erases the given edge from the graph. |
---|
1242 | /// |
---|
1243 | /// \note All iterators referencing the removed edge are invalidated, |
---|
1244 | /// of course. |
---|
1245 | void erase(Edge e) { Parent::erase(e); } |
---|
1246 | /// Node validity check |
---|
1247 | |
---|
1248 | /// This function gives back \c true if the given node is valid, |
---|
1249 | /// i.e. it is a real node of the graph. |
---|
1250 | /// |
---|
1251 | /// \warning A removed node could become valid again if new nodes are |
---|
1252 | /// added to the graph. |
---|
1253 | bool valid(Node n) const { return Parent::valid(n); } |
---|
1254 | /// Edge validity check |
---|
1255 | |
---|
1256 | /// This function gives back \c true if the given edge is valid, |
---|
1257 | /// i.e. it is a real edge of the graph. |
---|
1258 | /// |
---|
1259 | /// \warning A removed edge could become valid again if new edges are |
---|
1260 | /// added to the graph. |
---|
1261 | bool valid(Edge e) const { return Parent::valid(e); } |
---|
1262 | /// Arc validity check |
---|
1263 | |
---|
1264 | /// This function gives back \c true if the given arc is valid, |
---|
1265 | /// i.e. it is a real arc of the graph. |
---|
1266 | /// |
---|
1267 | /// \warning A removed arc could become valid again if new edges are |
---|
1268 | /// added to the graph. |
---|
1269 | bool valid(Arc a) const { return Parent::valid(a); } |
---|
1270 | |
---|
1271 | /// \brief Change the first node of an edge. |
---|
1272 | /// |
---|
1273 | /// This function changes the first node of the given edge \c e to \c n. |
---|
1274 | /// |
---|
1275 | ///\note \c EdgeIt and \c ArcIt iterators referencing the |
---|
1276 | ///changed edge are invalidated and all other iterators whose |
---|
1277 | ///base node is the changed node are also invalidated. |
---|
1278 | /// |
---|
1279 | ///\warning This functionality cannot be used together with the |
---|
1280 | ///Snapshot feature. |
---|
1281 | void changeU(Edge e, Node n) { |
---|
1282 | Parent::changeU(e,n); |
---|
1283 | } |
---|
1284 | /// \brief Change the second node of an edge. |
---|
1285 | /// |
---|
1286 | /// This function changes the second node of the given edge \c e to \c n. |
---|
1287 | /// |
---|
1288 | ///\note \c EdgeIt iterators referencing the changed edge remain |
---|
1289 | ///valid, but \c ArcIt iterators referencing the changed edge and |
---|
1290 | ///all other iterators whose base node is the changed node are also |
---|
1291 | ///invalidated. |
---|
1292 | /// |
---|
1293 | ///\warning This functionality cannot be used together with the |
---|
1294 | ///Snapshot feature. |
---|
1295 | void changeV(Edge e, Node n) { |
---|
1296 | Parent::changeV(e,n); |
---|
1297 | } |
---|
1298 | |
---|
1299 | /// \brief Contract two nodes. |
---|
1300 | /// |
---|
1301 | /// This function contracts the given two nodes. |
---|
1302 | /// Node \c b is removed, but instead of deleting |
---|
1303 | /// its incident edges, they are joined to node \c a. |
---|
1304 | /// If the last parameter \c r is \c true (this is the default value), |
---|
1305 | /// then the newly created loops are removed. |
---|
1306 | /// |
---|
1307 | /// \note The moved edges are joined to node \c a using changeU() |
---|
1308 | /// or changeV(), thus all edge and arc iterators whose base node is |
---|
1309 | /// \c b are invalidated. |
---|
1310 | /// Moreover all iterators referencing node \c b or the removed |
---|
1311 | /// loops are also invalidated. Other iterators remain valid. |
---|
1312 | /// |
---|
1313 | ///\warning This functionality cannot be used together with the |
---|
1314 | ///Snapshot feature. |
---|
1315 | void contract(Node a, Node b, bool r = true) { |
---|
1316 | for(IncEdgeIt e(*this, b); e!=INVALID;) { |
---|
1317 | IncEdgeIt f = e; ++f; |
---|
1318 | if (r && runningNode(e) == a) { |
---|
1319 | erase(e); |
---|
1320 | } else if (u(e) == b) { |
---|
1321 | changeU(e, a); |
---|
1322 | } else { |
---|
1323 | changeV(e, a); |
---|
1324 | } |
---|
1325 | e = f; |
---|
1326 | } |
---|
1327 | erase(b); |
---|
1328 | } |
---|
1329 | |
---|
1330 | ///Clear the graph. |
---|
1331 | |
---|
1332 | ///This function erases all nodes and arcs from the graph. |
---|
1333 | /// |
---|
1334 | ///\note All iterators of the graph are invalidated, of course. |
---|
1335 | void clear() { |
---|
1336 | Parent::clear(); |
---|
1337 | } |
---|
1338 | |
---|
1339 | /// Reserve memory for nodes. |
---|
1340 | |
---|
1341 | /// Using this function, it is possible to avoid superfluous memory |
---|
1342 | /// allocation: if you know that the graph you want to build will |
---|
1343 | /// be large (e.g. it will contain millions of nodes and/or edges), |
---|
1344 | /// then it is worth reserving space for this amount before starting |
---|
1345 | /// to build the graph. |
---|
1346 | /// \sa reserveEdge() |
---|
1347 | void reserveNode(int n) { _nodes.reserve(n); }; |
---|
1348 | |
---|
1349 | /// Reserve memory for edges. |
---|
1350 | |
---|
1351 | /// Using this function, it is possible to avoid superfluous memory |
---|
1352 | /// allocation: if you know that the graph you want to build will |
---|
1353 | /// be large (e.g. it will contain millions of nodes and/or edges), |
---|
1354 | /// then it is worth reserving space for this amount before starting |
---|
1355 | /// to build the graph. |
---|
1356 | /// \sa reserveNode() |
---|
1357 | void reserveEdge(int m) { _arcs.reserve(2 * m); }; |
---|
1358 | |
---|
1359 | /// \brief Class to make a snapshot of the graph and restore |
---|
1360 | /// it later. |
---|
1361 | /// |
---|
1362 | /// Class to make a snapshot of the graph and restore it later. |
---|
1363 | /// |
---|
1364 | /// The newly added nodes and edges can be removed |
---|
1365 | /// using the restore() function. |
---|
1366 | /// |
---|
1367 | /// \note After a state is restored, you cannot restore a later state, |
---|
1368 | /// i.e. you cannot add the removed nodes and edges again using |
---|
1369 | /// another Snapshot instance. |
---|
1370 | /// |
---|
1371 | /// \warning Node and edge deletions and other modifications |
---|
1372 | /// (e.g. changing the end-nodes of edges or contracting nodes) |
---|
1373 | /// cannot be restored. These events invalidate the snapshot. |
---|
1374 | /// However, the edges and nodes that were added to the graph after |
---|
1375 | /// making the current snapshot can be removed without invalidating it. |
---|
1376 | class Snapshot { |
---|
1377 | protected: |
---|
1378 | |
---|
1379 | typedef Parent::NodeNotifier NodeNotifier; |
---|
1380 | |
---|
1381 | class NodeObserverProxy : public NodeNotifier::ObserverBase { |
---|
1382 | public: |
---|
1383 | |
---|
1384 | NodeObserverProxy(Snapshot& _snapshot) |
---|
1385 | : snapshot(_snapshot) {} |
---|
1386 | |
---|
1387 | using NodeNotifier::ObserverBase::attach; |
---|
1388 | using NodeNotifier::ObserverBase::detach; |
---|
1389 | using NodeNotifier::ObserverBase::attached; |
---|
1390 | |
---|
1391 | protected: |
---|
1392 | |
---|
1393 | virtual void add(const Node& node) { |
---|
1394 | snapshot.addNode(node); |
---|
1395 | } |
---|
1396 | virtual void add(const std::vector<Node>& nodes) { |
---|
1397 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
1398 | snapshot.addNode(nodes[i]); |
---|
1399 | } |
---|
1400 | } |
---|
1401 | virtual void erase(const Node& node) { |
---|
1402 | snapshot.eraseNode(node); |
---|
1403 | } |
---|
1404 | virtual void erase(const std::vector<Node>& nodes) { |
---|
1405 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
1406 | snapshot.eraseNode(nodes[i]); |
---|
1407 | } |
---|
1408 | } |
---|
1409 | virtual void build() { |
---|
1410 | Node node; |
---|
1411 | std::vector<Node> nodes; |
---|
1412 | for (notifier()->first(node); node != INVALID; |
---|
1413 | notifier()->next(node)) { |
---|
1414 | nodes.push_back(node); |
---|
1415 | } |
---|
1416 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
1417 | snapshot.addNode(nodes[i]); |
---|
1418 | } |
---|
1419 | } |
---|
1420 | virtual void clear() { |
---|
1421 | Node node; |
---|
1422 | for (notifier()->first(node); node != INVALID; |
---|
1423 | notifier()->next(node)) { |
---|
1424 | snapshot.eraseNode(node); |
---|
1425 | } |
---|
1426 | } |
---|
1427 | |
---|
1428 | Snapshot& snapshot; |
---|
1429 | }; |
---|
1430 | |
---|
1431 | class EdgeObserverProxy : public EdgeNotifier::ObserverBase { |
---|
1432 | public: |
---|
1433 | |
---|
1434 | EdgeObserverProxy(Snapshot& _snapshot) |
---|
1435 | : snapshot(_snapshot) {} |
---|
1436 | |
---|
1437 | using EdgeNotifier::ObserverBase::attach; |
---|
1438 | using EdgeNotifier::ObserverBase::detach; |
---|
1439 | using EdgeNotifier::ObserverBase::attached; |
---|
1440 | |
---|
1441 | protected: |
---|
1442 | |
---|
1443 | virtual void add(const Edge& edge) { |
---|
1444 | snapshot.addEdge(edge); |
---|
1445 | } |
---|
1446 | virtual void add(const std::vector<Edge>& edges) { |
---|
1447 | for (int i = edges.size() - 1; i >= 0; --i) { |
---|
1448 | snapshot.addEdge(edges[i]); |
---|
1449 | } |
---|
1450 | } |
---|
1451 | virtual void erase(const Edge& edge) { |
---|
1452 | snapshot.eraseEdge(edge); |
---|
1453 | } |
---|
1454 | virtual void erase(const std::vector<Edge>& edges) { |
---|
1455 | for (int i = 0; i < int(edges.size()); ++i) { |
---|
1456 | snapshot.eraseEdge(edges[i]); |
---|
1457 | } |
---|
1458 | } |
---|
1459 | virtual void build() { |
---|
1460 | Edge edge; |
---|
1461 | std::vector<Edge> edges; |
---|
1462 | for (notifier()->first(edge); edge != INVALID; |
---|
1463 | notifier()->next(edge)) { |
---|
1464 | edges.push_back(edge); |
---|
1465 | } |
---|
1466 | for (int i = edges.size() - 1; i >= 0; --i) { |
---|
1467 | snapshot.addEdge(edges[i]); |
---|
1468 | } |
---|
1469 | } |
---|
1470 | virtual void clear() { |
---|
1471 | Edge edge; |
---|
1472 | for (notifier()->first(edge); edge != INVALID; |
---|
1473 | notifier()->next(edge)) { |
---|
1474 | snapshot.eraseEdge(edge); |
---|
1475 | } |
---|
1476 | } |
---|
1477 | |
---|
1478 | Snapshot& snapshot; |
---|
1479 | }; |
---|
1480 | |
---|
1481 | ListGraph *graph; |
---|
1482 | |
---|
1483 | NodeObserverProxy node_observer_proxy; |
---|
1484 | EdgeObserverProxy edge_observer_proxy; |
---|
1485 | |
---|
1486 | std::list<Node> added_nodes; |
---|
1487 | std::list<Edge> added_edges; |
---|
1488 | |
---|
1489 | |
---|
1490 | void addNode(const Node& node) { |
---|
1491 | added_nodes.push_front(node); |
---|
1492 | } |
---|
1493 | void eraseNode(const Node& node) { |
---|
1494 | std::list<Node>::iterator it = |
---|
1495 | std::find(added_nodes.begin(), added_nodes.end(), node); |
---|
1496 | if (it == added_nodes.end()) { |
---|
1497 | clear(); |
---|
1498 | edge_observer_proxy.detach(); |
---|
1499 | throw NodeNotifier::ImmediateDetach(); |
---|
1500 | } else { |
---|
1501 | added_nodes.erase(it); |
---|
1502 | } |
---|
1503 | } |
---|
1504 | |
---|
1505 | void addEdge(const Edge& edge) { |
---|
1506 | added_edges.push_front(edge); |
---|
1507 | } |
---|
1508 | void eraseEdge(const Edge& edge) { |
---|
1509 | std::list<Edge>::iterator it = |
---|
1510 | std::find(added_edges.begin(), added_edges.end(), edge); |
---|
1511 | if (it == added_edges.end()) { |
---|
1512 | clear(); |
---|
1513 | node_observer_proxy.detach(); |
---|
1514 | throw EdgeNotifier::ImmediateDetach(); |
---|
1515 | } else { |
---|
1516 | added_edges.erase(it); |
---|
1517 | } |
---|
1518 | } |
---|
1519 | |
---|
1520 | void attach(ListGraph &_graph) { |
---|
1521 | graph = &_graph; |
---|
1522 | node_observer_proxy.attach(graph->notifier(Node())); |
---|
1523 | edge_observer_proxy.attach(graph->notifier(Edge())); |
---|
1524 | } |
---|
1525 | |
---|
1526 | void detach() { |
---|
1527 | node_observer_proxy.detach(); |
---|
1528 | edge_observer_proxy.detach(); |
---|
1529 | } |
---|
1530 | |
---|
1531 | bool attached() const { |
---|
1532 | return node_observer_proxy.attached(); |
---|
1533 | } |
---|
1534 | |
---|
1535 | void clear() { |
---|
1536 | added_nodes.clear(); |
---|
1537 | added_edges.clear(); |
---|
1538 | } |
---|
1539 | |
---|
1540 | public: |
---|
1541 | |
---|
1542 | /// \brief Default constructor. |
---|
1543 | /// |
---|
1544 | /// Default constructor. |
---|
1545 | /// You have to call save() to actually make a snapshot. |
---|
1546 | Snapshot() |
---|
1547 | : graph(0), node_observer_proxy(*this), |
---|
1548 | edge_observer_proxy(*this) {} |
---|
1549 | |
---|
1550 | /// \brief Constructor that immediately makes a snapshot. |
---|
1551 | /// |
---|
1552 | /// This constructor immediately makes a snapshot of the given graph. |
---|
1553 | Snapshot(ListGraph &gr) |
---|
1554 | : node_observer_proxy(*this), |
---|
1555 | edge_observer_proxy(*this) { |
---|
1556 | attach(gr); |
---|
1557 | } |
---|
1558 | |
---|
1559 | /// \brief Make a snapshot. |
---|
1560 | /// |
---|
1561 | /// This function makes a snapshot of the given graph. |
---|
1562 | /// It can be called more than once. In case of a repeated |
---|
1563 | /// call, the previous snapshot gets lost. |
---|
1564 | void save(ListGraph &gr) { |
---|
1565 | if (attached()) { |
---|
1566 | detach(); |
---|
1567 | clear(); |
---|
1568 | } |
---|
1569 | attach(gr); |
---|
1570 | } |
---|
1571 | |
---|
1572 | /// \brief Undo the changes until the last snapshot. |
---|
1573 | /// |
---|
1574 | /// This function undos the changes until the last snapshot |
---|
1575 | /// created by save() or Snapshot(ListGraph&). |
---|
1576 | /// |
---|
1577 | /// \warning This method invalidates the snapshot, i.e. repeated |
---|
1578 | /// restoring is not supported unless you call save() again. |
---|
1579 | void restore() { |
---|
1580 | detach(); |
---|
1581 | for(std::list<Edge>::iterator it = added_edges.begin(); |
---|
1582 | it != added_edges.end(); ++it) { |
---|
1583 | graph->erase(*it); |
---|
1584 | } |
---|
1585 | for(std::list<Node>::iterator it = added_nodes.begin(); |
---|
1586 | it != added_nodes.end(); ++it) { |
---|
1587 | graph->erase(*it); |
---|
1588 | } |
---|
1589 | clear(); |
---|
1590 | } |
---|
1591 | |
---|
1592 | /// \brief Returns \c true if the snapshot is valid. |
---|
1593 | /// |
---|
1594 | /// This function returns \c true if the snapshot is valid. |
---|
1595 | bool valid() const { |
---|
1596 | return attached(); |
---|
1597 | } |
---|
1598 | }; |
---|
1599 | }; |
---|
1600 | |
---|
1601 | /// @} |
---|
1602 | |
---|
1603 | class ListBpGraphBase { |
---|
1604 | |
---|
1605 | protected: |
---|
1606 | |
---|
1607 | struct NodeT { |
---|
1608 | int first_out; |
---|
1609 | int prev, next; |
---|
1610 | int partition_prev, partition_next; |
---|
1611 | int partition_index; |
---|
1612 | bool red; |
---|
1613 | }; |
---|
1614 | |
---|
1615 | struct ArcT { |
---|
1616 | int target; |
---|
1617 | int prev_out, next_out; |
---|
1618 | }; |
---|
1619 | |
---|
1620 | std::vector<NodeT> _nodes; |
---|
1621 | |
---|
1622 | int first_node, first_red, first_blue; |
---|
1623 | int max_red, max_blue; |
---|
1624 | |
---|
1625 | int first_free_red, first_free_blue; |
---|
1626 | |
---|
1627 | std::vector<ArcT> _arcs; |
---|
1628 | |
---|
1629 | int first_free_arc; |
---|
1630 | |
---|
1631 | public: |
---|
1632 | |
---|
1633 | typedef ListBpGraphBase BpGraph; |
---|
1634 | |
---|
1635 | class Node { |
---|
1636 | friend class ListBpGraphBase; |
---|
1637 | protected: |
---|
1638 | |
---|
1639 | int id; |
---|
1640 | explicit Node(int pid) { id = pid;} |
---|
1641 | |
---|
1642 | public: |
---|
1643 | Node() {} |
---|
1644 | Node (Invalid) { id = -1; } |
---|
1645 | bool operator==(const Node& node) const {return id == node.id;} |
---|
1646 | bool operator!=(const Node& node) const {return id != node.id;} |
---|
1647 | bool operator<(const Node& node) const {return id < node.id;} |
---|
1648 | }; |
---|
1649 | |
---|
1650 | class RedNode : public Node { |
---|
1651 | friend class ListBpGraphBase; |
---|
1652 | protected: |
---|
1653 | |
---|
1654 | explicit RedNode(int pid) : Node(pid) {} |
---|
1655 | |
---|
1656 | public: |
---|
1657 | RedNode() {} |
---|
1658 | RedNode(const RedNode& node) : Node(node) {} |
---|
1659 | RedNode(Invalid) : Node(INVALID){} |
---|
1660 | const RedNode& operator=(const RedNode& node) { Node::operator=(node); return *this;} |
---|
1661 | }; |
---|
1662 | |
---|
1663 | class BlueNode : public Node { |
---|
1664 | friend class ListBpGraphBase; |
---|
1665 | protected: |
---|
1666 | |
---|
1667 | explicit BlueNode(int pid) : Node(pid) {} |
---|
1668 | |
---|
1669 | public: |
---|
1670 | BlueNode() {} |
---|
1671 | BlueNode(const BlueNode& node) : Node(node) {} |
---|
1672 | BlueNode(Invalid) : Node(INVALID){} |
---|
1673 | const BlueNode& operator=(const BlueNode& node) { Node::operator=(node); return *this;} |
---|
1674 | }; |
---|
1675 | |
---|
1676 | class Edge { |
---|
1677 | friend class ListBpGraphBase; |
---|
1678 | protected: |
---|
1679 | |
---|
1680 | int id; |
---|
1681 | explicit Edge(int pid) { id = pid;} |
---|
1682 | |
---|
1683 | public: |
---|
1684 | Edge() {} |
---|
1685 | Edge (Invalid) { id = -1; } |
---|
1686 | bool operator==(const Edge& edge) const {return id == edge.id;} |
---|
1687 | bool operator!=(const Edge& edge) const {return id != edge.id;} |
---|
1688 | bool operator<(const Edge& edge) const {return id < edge.id;} |
---|
1689 | }; |
---|
1690 | |
---|
1691 | class Arc { |
---|
1692 | friend class ListBpGraphBase; |
---|
1693 | protected: |
---|
1694 | |
---|
1695 | int id; |
---|
1696 | explicit Arc(int pid) { id = pid;} |
---|
1697 | |
---|
1698 | public: |
---|
1699 | operator Edge() const { |
---|
1700 | return id != -1 ? edgeFromId(id / 2) : INVALID; |
---|
1701 | } |
---|
1702 | |
---|
1703 | Arc() {} |
---|
1704 | Arc (Invalid) { id = -1; } |
---|
1705 | bool operator==(const Arc& arc) const {return id == arc.id;} |
---|
1706 | bool operator!=(const Arc& arc) const {return id != arc.id;} |
---|
1707 | bool operator<(const Arc& arc) const {return id < arc.id;} |
---|
1708 | }; |
---|
1709 | |
---|
1710 | ListBpGraphBase() |
---|
1711 | : _nodes(), first_node(-1), |
---|
1712 | first_red(-1), first_blue(-1), |
---|
1713 | max_red(-1), max_blue(-1), |
---|
1714 | first_free_red(-1), first_free_blue(-1), |
---|
1715 | _arcs(), first_free_arc(-1) {} |
---|
1716 | |
---|
1717 | |
---|
1718 | bool red(Node n) const { return _nodes[n.id].red; } |
---|
1719 | bool blue(Node n) const { return !_nodes[n.id].red; } |
---|
1720 | |
---|
1721 | static RedNode asRedNodeUnsafe(Node n) { return RedNode(n.id); } |
---|
1722 | static BlueNode asBlueNodeUnsafe(Node n) { return BlueNode(n.id); } |
---|
1723 | |
---|
1724 | int maxNodeId() const { return _nodes.size()-1; } |
---|
1725 | int maxRedId() const { return max_red; } |
---|
1726 | int maxBlueId() const { return max_blue; } |
---|
1727 | int maxEdgeId() const { return _arcs.size() / 2 - 1; } |
---|
1728 | int maxArcId() const { return _arcs.size()-1; } |
---|
1729 | |
---|
1730 | Node source(Arc e) const { return Node(_arcs[e.id ^ 1].target); } |
---|
1731 | Node target(Arc e) const { return Node(_arcs[e.id].target); } |
---|
1732 | |
---|
1733 | RedNode redNode(Edge e) const { |
---|
1734 | return RedNode(_arcs[2 * e.id].target); |
---|
1735 | } |
---|
1736 | BlueNode blueNode(Edge e) const { |
---|
1737 | return BlueNode(_arcs[2 * e.id + 1].target); |
---|
1738 | } |
---|
1739 | |
---|
1740 | static bool direction(Arc e) { |
---|
1741 | return (e.id & 1) == 1; |
---|
1742 | } |
---|
1743 | |
---|
1744 | static Arc direct(Edge e, bool d) { |
---|
1745 | return Arc(e.id * 2 + (d ? 1 : 0)); |
---|
1746 | } |
---|
1747 | |
---|
1748 | void first(Node& node) const { |
---|
1749 | node.id = first_node; |
---|
1750 | } |
---|
1751 | |
---|
1752 | void next(Node& node) const { |
---|
1753 | node.id = _nodes[node.id].next; |
---|
1754 | } |
---|
1755 | |
---|
1756 | void first(RedNode& node) const { |
---|
1757 | node.id = first_red; |
---|
1758 | } |
---|
1759 | |
---|
1760 | void next(RedNode& node) const { |
---|
1761 | node.id = _nodes[node.id].partition_next; |
---|
1762 | } |
---|
1763 | |
---|
1764 | void first(BlueNode& node) const { |
---|
1765 | node.id = first_blue; |
---|
1766 | } |
---|
1767 | |
---|
1768 | void next(BlueNode& node) const { |
---|
1769 | node.id = _nodes[node.id].partition_next; |
---|
1770 | } |
---|
1771 | |
---|
1772 | void first(Arc& e) const { |
---|
1773 | int n = first_node; |
---|
1774 | while (n != -1 && _nodes[n].first_out == -1) { |
---|
1775 | n = _nodes[n].next; |
---|
1776 | } |
---|
1777 | e.id = (n == -1) ? -1 : _nodes[n].first_out; |
---|
1778 | } |
---|
1779 | |
---|
1780 | void next(Arc& e) const { |
---|
1781 | if (_arcs[e.id].next_out != -1) { |
---|
1782 | e.id = _arcs[e.id].next_out; |
---|
1783 | } else { |
---|
1784 | int n = _nodes[_arcs[e.id ^ 1].target].next; |
---|
1785 | while(n != -1 && _nodes[n].first_out == -1) { |
---|
1786 | n = _nodes[n].next; |
---|
1787 | } |
---|
1788 | e.id = (n == -1) ? -1 : _nodes[n].first_out; |
---|
1789 | } |
---|
1790 | } |
---|
1791 | |
---|
1792 | void first(Edge& e) const { |
---|
1793 | int n = first_node; |
---|
1794 | while (n != -1) { |
---|
1795 | e.id = _nodes[n].first_out; |
---|
1796 | while ((e.id & 1) != 1) { |
---|
1797 | e.id = _arcs[e.id].next_out; |
---|
1798 | } |
---|
1799 | if (e.id != -1) { |
---|
1800 | e.id /= 2; |
---|
1801 | return; |
---|
1802 | } |
---|
1803 | n = _nodes[n].next; |
---|
1804 | } |
---|
1805 | e.id = -1; |
---|
1806 | } |
---|
1807 | |
---|
1808 | void next(Edge& e) const { |
---|
1809 | int n = _arcs[e.id * 2].target; |
---|
1810 | e.id = _arcs[(e.id * 2) | 1].next_out; |
---|
1811 | while ((e.id & 1) != 1) { |
---|
1812 | e.id = _arcs[e.id].next_out; |
---|
1813 | } |
---|
1814 | if (e.id != -1) { |
---|
1815 | e.id /= 2; |
---|
1816 | return; |
---|
1817 | } |
---|
1818 | n = _nodes[n].next; |
---|
1819 | while (n != -1) { |
---|
1820 | e.id = _nodes[n].first_out; |
---|
1821 | while ((e.id & 1) != 1) { |
---|
1822 | e.id = _arcs[e.id].next_out; |
---|
1823 | } |
---|
1824 | if (e.id != -1) { |
---|
1825 | e.id /= 2; |
---|
1826 | return; |
---|
1827 | } |
---|
1828 | n = _nodes[n].next; |
---|
1829 | } |
---|
1830 | e.id = -1; |
---|
1831 | } |
---|
1832 | |
---|
1833 | void firstOut(Arc &e, const Node& v) const { |
---|
1834 | e.id = _nodes[v.id].first_out; |
---|
1835 | } |
---|
1836 | void nextOut(Arc &e) const { |
---|
1837 | e.id = _arcs[e.id].next_out; |
---|
1838 | } |
---|
1839 | |
---|
1840 | void firstIn(Arc &e, const Node& v) const { |
---|
1841 | e.id = ((_nodes[v.id].first_out) ^ 1); |
---|
1842 | if (e.id == -2) e.id = -1; |
---|
1843 | } |
---|
1844 | void nextIn(Arc &e) const { |
---|
1845 | e.id = ((_arcs[e.id ^ 1].next_out) ^ 1); |
---|
1846 | if (e.id == -2) e.id = -1; |
---|
1847 | } |
---|
1848 | |
---|
1849 | void firstInc(Edge &e, bool& d, const Node& v) const { |
---|
1850 | int a = _nodes[v.id].first_out; |
---|
1851 | if (a != -1 ) { |
---|
1852 | e.id = a / 2; |
---|
1853 | d = ((a & 1) == 1); |
---|
1854 | } else { |
---|
1855 | e.id = -1; |
---|
1856 | d = true; |
---|
1857 | } |
---|
1858 | } |
---|
1859 | void nextInc(Edge &e, bool& d) const { |
---|
1860 | int a = (_arcs[(e.id * 2) | (d ? 1 : 0)].next_out); |
---|
1861 | if (a != -1 ) { |
---|
1862 | e.id = a / 2; |
---|
1863 | d = ((a & 1) == 1); |
---|
1864 | } else { |
---|
1865 | e.id = -1; |
---|
1866 | d = true; |
---|
1867 | } |
---|
1868 | } |
---|
1869 | |
---|
1870 | static int id(Node v) { return v.id; } |
---|
1871 | int id(RedNode v) const { return _nodes[v.id].partition_index; } |
---|
1872 | int id(BlueNode v) const { return _nodes[v.id].partition_index; } |
---|
1873 | static int id(Arc e) { return e.id; } |
---|
1874 | static int id(Edge e) { return e.id; } |
---|
1875 | |
---|
1876 | static Node nodeFromId(int id) { return Node(id);} |
---|
1877 | static Arc arcFromId(int id) { return Arc(id);} |
---|
1878 | static Edge edgeFromId(int id) { return Edge(id);} |
---|
1879 | |
---|
1880 | bool valid(Node n) const { |
---|
1881 | return n.id >= 0 && n.id < static_cast<int>(_nodes.size()) && |
---|
1882 | _nodes[n.id].prev != -2; |
---|
1883 | } |
---|
1884 | |
---|
1885 | bool valid(Arc a) const { |
---|
1886 | return a.id >= 0 && a.id < static_cast<int>(_arcs.size()) && |
---|
1887 | _arcs[a.id].prev_out != -2; |
---|
1888 | } |
---|
1889 | |
---|
1890 | bool valid(Edge e) const { |
---|
1891 | return e.id >= 0 && 2 * e.id < static_cast<int>(_arcs.size()) && |
---|
1892 | _arcs[2 * e.id].prev_out != -2; |
---|
1893 | } |
---|
1894 | |
---|
1895 | RedNode addRedNode() { |
---|
1896 | int n; |
---|
1897 | |
---|
1898 | if(first_free_red==-1) { |
---|
1899 | n = _nodes.size(); |
---|
1900 | _nodes.push_back(NodeT()); |
---|
1901 | _nodes[n].partition_index = ++max_red; |
---|
1902 | _nodes[n].red = true; |
---|
1903 | } else { |
---|
1904 | n = first_free_red; |
---|
1905 | first_free_red = _nodes[n].next; |
---|
1906 | } |
---|
1907 | |
---|
1908 | _nodes[n].next = first_node; |
---|
1909 | if (first_node != -1) _nodes[first_node].prev = n; |
---|
1910 | first_node = n; |
---|
1911 | _nodes[n].prev = -1; |
---|
1912 | |
---|
1913 | _nodes[n].partition_next = first_red; |
---|
1914 | if (first_red != -1) _nodes[first_red].partition_prev = n; |
---|
1915 | first_red = n; |
---|
1916 | _nodes[n].partition_prev = -1; |
---|
1917 | |
---|
1918 | _nodes[n].first_out = -1; |
---|
1919 | |
---|
1920 | return RedNode(n); |
---|
1921 | } |
---|
1922 | |
---|
1923 | BlueNode addBlueNode() { |
---|
1924 | int n; |
---|
1925 | |
---|
1926 | if(first_free_blue==-1) { |
---|
1927 | n = _nodes.size(); |
---|
1928 | _nodes.push_back(NodeT()); |
---|
1929 | _nodes[n].partition_index = ++max_blue; |
---|
1930 | _nodes[n].red = false; |
---|
1931 | } else { |
---|
1932 | n = first_free_blue; |
---|
1933 | first_free_blue = _nodes[n].next; |
---|
1934 | } |
---|
1935 | |
---|
1936 | _nodes[n].next = first_node; |
---|
1937 | if (first_node != -1) _nodes[first_node].prev = n; |
---|
1938 | first_node = n; |
---|
1939 | _nodes[n].prev = -1; |
---|
1940 | |
---|
1941 | _nodes[n].partition_next = first_blue; |
---|
1942 | if (first_blue != -1) _nodes[first_blue].partition_prev = n; |
---|
1943 | first_blue = n; |
---|
1944 | _nodes[n].partition_prev = -1; |
---|
1945 | |
---|
1946 | _nodes[n].first_out = -1; |
---|
1947 | |
---|
1948 | return BlueNode(n); |
---|
1949 | } |
---|
1950 | |
---|
1951 | Edge addEdge(Node u, Node v) { |
---|
1952 | int n; |
---|
1953 | |
---|
1954 | if (first_free_arc == -1) { |
---|
1955 | n = _arcs.size(); |
---|
1956 | _arcs.push_back(ArcT()); |
---|
1957 | _arcs.push_back(ArcT()); |
---|
1958 | } else { |
---|
1959 | n = first_free_arc; |
---|
1960 | first_free_arc = _arcs[n].next_out; |
---|
1961 | } |
---|
1962 | |
---|
1963 | _arcs[n].target = u.id; |
---|
1964 | _arcs[n | 1].target = v.id; |
---|
1965 | |
---|
1966 | _arcs[n].next_out = _nodes[v.id].first_out; |
---|
1967 | if (_nodes[v.id].first_out != -1) { |
---|
1968 | _arcs[_nodes[v.id].first_out].prev_out = n; |
---|
1969 | } |
---|
1970 | _arcs[n].prev_out = -1; |
---|
1971 | _nodes[v.id].first_out = n; |
---|
1972 | |
---|
1973 | _arcs[n | 1].next_out = _nodes[u.id].first_out; |
---|
1974 | if (_nodes[u.id].first_out != -1) { |
---|
1975 | _arcs[_nodes[u.id].first_out].prev_out = (n | 1); |
---|
1976 | } |
---|
1977 | _arcs[n | 1].prev_out = -1; |
---|
1978 | _nodes[u.id].first_out = (n | 1); |
---|
1979 | |
---|
1980 | return Edge(n / 2); |
---|
1981 | } |
---|
1982 | |
---|
1983 | void erase(const Node& node) { |
---|
1984 | int n = node.id; |
---|
1985 | |
---|
1986 | if(_nodes[n].next != -1) { |
---|
1987 | _nodes[_nodes[n].next].prev = _nodes[n].prev; |
---|
1988 | } |
---|
1989 | |
---|
1990 | if(_nodes[n].prev != -1) { |
---|
1991 | _nodes[_nodes[n].prev].next = _nodes[n].next; |
---|
1992 | } else { |
---|
1993 | first_node = _nodes[n].next; |
---|
1994 | } |
---|
1995 | |
---|
1996 | if (_nodes[n].partition_next != -1) { |
---|
1997 | _nodes[_nodes[n].partition_next].partition_prev = _nodes[n].partition_prev; |
---|
1998 | } |
---|
1999 | |
---|
2000 | if (_nodes[n].partition_prev != -1) { |
---|
2001 | _nodes[_nodes[n].partition_prev].partition_next = _nodes[n].partition_next; |
---|
2002 | } else { |
---|
2003 | if (_nodes[n].red) { |
---|
2004 | first_red = _nodes[n].partition_next; |
---|
2005 | } else { |
---|
2006 | first_blue = _nodes[n].partition_next; |
---|
2007 | } |
---|
2008 | } |
---|
2009 | |
---|
2010 | if (_nodes[n].red) { |
---|
2011 | _nodes[n].next = first_free_red; |
---|
2012 | first_free_red = n; |
---|
2013 | } else { |
---|
2014 | _nodes[n].next = first_free_blue; |
---|
2015 | first_free_blue = n; |
---|
2016 | } |
---|
2017 | _nodes[n].prev = -2; |
---|
2018 | } |
---|
2019 | |
---|
2020 | void erase(const Edge& edge) { |
---|
2021 | int n = edge.id * 2; |
---|
2022 | |
---|
2023 | if (_arcs[n].next_out != -1) { |
---|
2024 | _arcs[_arcs[n].next_out].prev_out = _arcs[n].prev_out; |
---|
2025 | } |
---|
2026 | |
---|
2027 | if (_arcs[n].prev_out != -1) { |
---|
2028 | _arcs[_arcs[n].prev_out].next_out = _arcs[n].next_out; |
---|
2029 | } else { |
---|
2030 | _nodes[_arcs[n | 1].target].first_out = _arcs[n].next_out; |
---|
2031 | } |
---|
2032 | |
---|
2033 | if (_arcs[n | 1].next_out != -1) { |
---|
2034 | _arcs[_arcs[n | 1].next_out].prev_out = _arcs[n | 1].prev_out; |
---|
2035 | } |
---|
2036 | |
---|
2037 | if (_arcs[n | 1].prev_out != -1) { |
---|
2038 | _arcs[_arcs[n | 1].prev_out].next_out = _arcs[n | 1].next_out; |
---|
2039 | } else { |
---|
2040 | _nodes[_arcs[n].target].first_out = _arcs[n | 1].next_out; |
---|
2041 | } |
---|
2042 | |
---|
2043 | _arcs[n].next_out = first_free_arc; |
---|
2044 | first_free_arc = n; |
---|
2045 | _arcs[n].prev_out = -2; |
---|
2046 | _arcs[n | 1].prev_out = -2; |
---|
2047 | |
---|
2048 | } |
---|
2049 | |
---|
2050 | void clear() { |
---|
2051 | _arcs.clear(); |
---|
2052 | _nodes.clear(); |
---|
2053 | first_node = first_free_arc = first_red = first_blue = |
---|
2054 | max_red = max_blue = first_free_red = first_free_blue = -1; |
---|
2055 | } |
---|
2056 | |
---|
2057 | protected: |
---|
2058 | |
---|
2059 | void changeRed(Edge e, RedNode n) { |
---|
2060 | if(_arcs[(2 * e.id) | 1].next_out != -1) { |
---|
2061 | _arcs[_arcs[(2 * e.id) | 1].next_out].prev_out = |
---|
2062 | _arcs[(2 * e.id) | 1].prev_out; |
---|
2063 | } |
---|
2064 | if(_arcs[(2 * e.id) | 1].prev_out != -1) { |
---|
2065 | _arcs[_arcs[(2 * e.id) | 1].prev_out].next_out = |
---|
2066 | _arcs[(2 * e.id) | 1].next_out; |
---|
2067 | } else { |
---|
2068 | _nodes[_arcs[2 * e.id].target].first_out = |
---|
2069 | _arcs[(2 * e.id) | 1].next_out; |
---|
2070 | } |
---|
2071 | |
---|
2072 | if (_nodes[n.id].first_out != -1) { |
---|
2073 | _arcs[_nodes[n.id].first_out].prev_out = ((2 * e.id) | 1); |
---|
2074 | } |
---|
2075 | _arcs[2 * e.id].target = n.id; |
---|
2076 | _arcs[(2 * e.id) | 1].prev_out = -1; |
---|
2077 | _arcs[(2 * e.id) | 1].next_out = _nodes[n.id].first_out; |
---|
2078 | _nodes[n.id].first_out = ((2 * e.id) | 1); |
---|
2079 | } |
---|
2080 | |
---|
2081 | void changeBlue(Edge e, BlueNode n) { |
---|
2082 | if(_arcs[2 * e.id].next_out != -1) { |
---|
2083 | _arcs[_arcs[2 * e.id].next_out].prev_out = _arcs[2 * e.id].prev_out; |
---|
2084 | } |
---|
2085 | if(_arcs[2 * e.id].prev_out != -1) { |
---|
2086 | _arcs[_arcs[2 * e.id].prev_out].next_out = |
---|
2087 | _arcs[2 * e.id].next_out; |
---|
2088 | } else { |
---|
2089 | _nodes[_arcs[(2 * e.id) | 1].target].first_out = |
---|
2090 | _arcs[2 * e.id].next_out; |
---|
2091 | } |
---|
2092 | |
---|
2093 | if (_nodes[n.id].first_out != -1) { |
---|
2094 | _arcs[_nodes[n.id].first_out].prev_out = 2 * e.id; |
---|
2095 | } |
---|
2096 | _arcs[(2 * e.id) | 1].target = n.id; |
---|
2097 | _arcs[2 * e.id].prev_out = -1; |
---|
2098 | _arcs[2 * e.id].next_out = _nodes[n.id].first_out; |
---|
2099 | _nodes[n.id].first_out = 2 * e.id; |
---|
2100 | } |
---|
2101 | |
---|
2102 | }; |
---|
2103 | |
---|
2104 | typedef BpGraphExtender<ListBpGraphBase> ExtendedListBpGraphBase; |
---|
2105 | |
---|
2106 | |
---|
2107 | /// \addtogroup graphs |
---|
2108 | /// @{ |
---|
2109 | |
---|
2110 | ///A general undirected graph structure. |
---|
2111 | |
---|
2112 | ///\ref ListBpGraph is a versatile and fast undirected graph |
---|
2113 | ///implementation based on linked lists that are stored in |
---|
2114 | ///\c std::vector structures. |
---|
2115 | /// |
---|
2116 | ///This type fully conforms to the \ref concepts::BpGraph "BpGraph concept" |
---|
2117 | ///and it also provides several useful additional functionalities. |
---|
2118 | ///Most of its member functions and nested classes are documented |
---|
2119 | ///only in the concept class. |
---|
2120 | /// |
---|
2121 | ///This class provides only linear time counting for nodes, edges and arcs. |
---|
2122 | /// |
---|
2123 | ///\sa concepts::BpGraph |
---|
2124 | ///\sa ListDigraph |
---|
2125 | class ListBpGraph : public ExtendedListBpGraphBase { |
---|
2126 | typedef ExtendedListBpGraphBase Parent; |
---|
2127 | |
---|
2128 | private: |
---|
2129 | /// BpGraphs are \e not copy constructible. Use BpGraphCopy instead. |
---|
2130 | ListBpGraph(const ListBpGraph &) :ExtendedListBpGraphBase() {}; |
---|
2131 | /// \brief Assignment of a graph to another one is \e not allowed. |
---|
2132 | /// Use BpGraphCopy instead. |
---|
2133 | void operator=(const ListBpGraph &) {} |
---|
2134 | public: |
---|
2135 | /// Constructor |
---|
2136 | |
---|
2137 | /// Constructor. |
---|
2138 | /// |
---|
2139 | ListBpGraph() {} |
---|
2140 | |
---|
2141 | typedef Parent::IncEdgeIt IncEdgeIt; |
---|
2142 | |
---|
2143 | /// \brief Add a new red node to the graph. |
---|
2144 | /// |
---|
2145 | /// This function adds a red new node to the graph. |
---|
2146 | /// \return The new node. |
---|
2147 | RedNode addRedNode() { return Parent::addRedNode(); } |
---|
2148 | |
---|
2149 | /// \brief Add a new blue node to the graph. |
---|
2150 | /// |
---|
2151 | /// This function adds a blue new node to the graph. |
---|
2152 | /// \return The new node. |
---|
2153 | BlueNode addBlueNode() { return Parent::addBlueNode(); } |
---|
2154 | |
---|
2155 | /// \brief Add a new edge to the graph. |
---|
2156 | /// |
---|
2157 | /// This function adds a new edge to the graph between nodes |
---|
2158 | /// \c u and \c v with inherent orientation from node \c u to |
---|
2159 | /// node \c v. |
---|
2160 | /// \return The new edge. |
---|
2161 | Edge addEdge(RedNode u, BlueNode v) { |
---|
2162 | return Parent::addEdge(u, v); |
---|
2163 | } |
---|
2164 | Edge addEdge(BlueNode v, RedNode u) { |
---|
2165 | return Parent::addEdge(u, v); |
---|
2166 | } |
---|
2167 | |
---|
2168 | ///\brief Erase a node from the graph. |
---|
2169 | /// |
---|
2170 | /// This function erases the given node along with its incident arcs |
---|
2171 | /// from the graph. |
---|
2172 | /// |
---|
2173 | /// \note All iterators referencing the removed node or the incident |
---|
2174 | /// edges are invalidated, of course. |
---|
2175 | void erase(Node n) { Parent::erase(n); } |
---|
2176 | |
---|
2177 | ///\brief Erase an edge from the graph. |
---|
2178 | /// |
---|
2179 | /// This function erases the given edge from the graph. |
---|
2180 | /// |
---|
2181 | /// \note All iterators referencing the removed edge are invalidated, |
---|
2182 | /// of course. |
---|
2183 | void erase(Edge e) { Parent::erase(e); } |
---|
2184 | /// Node validity check |
---|
2185 | |
---|
2186 | /// This function gives back \c true if the given node is valid, |
---|
2187 | /// i.e. it is a real node of the graph. |
---|
2188 | /// |
---|
2189 | /// \warning A removed node could become valid again if new nodes are |
---|
2190 | /// added to the graph. |
---|
2191 | bool valid(Node n) const { return Parent::valid(n); } |
---|
2192 | /// Edge validity check |
---|
2193 | |
---|
2194 | /// This function gives back \c true if the given edge is valid, |
---|
2195 | /// i.e. it is a real edge of the graph. |
---|
2196 | /// |
---|
2197 | /// \warning A removed edge could become valid again if new edges are |
---|
2198 | /// added to the graph. |
---|
2199 | bool valid(Edge e) const { return Parent::valid(e); } |
---|
2200 | /// Arc validity check |
---|
2201 | |
---|
2202 | /// This function gives back \c true if the given arc is valid, |
---|
2203 | /// i.e. it is a real arc of the graph. |
---|
2204 | /// |
---|
2205 | /// \warning A removed arc could become valid again if new edges are |
---|
2206 | /// added to the graph. |
---|
2207 | bool valid(Arc a) const { return Parent::valid(a); } |
---|
2208 | |
---|
2209 | /// \brief Change the red node of an edge. |
---|
2210 | /// |
---|
2211 | /// This function changes the red node of the given edge \c e to \c n. |
---|
2212 | /// |
---|
2213 | ///\note \c EdgeIt and \c ArcIt iterators referencing the |
---|
2214 | ///changed edge are invalidated and all other iterators whose |
---|
2215 | ///base node is the changed node are also invalidated. |
---|
2216 | /// |
---|
2217 | ///\warning This functionality cannot be used together with the |
---|
2218 | ///Snapshot feature. |
---|
2219 | void changeRed(Edge e, RedNode n) { |
---|
2220 | Parent::changeRed(e, n); |
---|
2221 | } |
---|
2222 | /// \brief Change the blue node of an edge. |
---|
2223 | /// |
---|
2224 | /// This function changes the blue node of the given edge \c e to \c n. |
---|
2225 | /// |
---|
2226 | ///\note \c EdgeIt iterators referencing the changed edge remain |
---|
2227 | ///valid, but \c ArcIt iterators referencing the changed edge and |
---|
2228 | ///all other iterators whose base node is the changed node are also |
---|
2229 | ///invalidated. |
---|
2230 | /// |
---|
2231 | ///\warning This functionality cannot be used together with the |
---|
2232 | ///Snapshot feature. |
---|
2233 | void changeBlue(Edge e, BlueNode n) { |
---|
2234 | Parent::changeBlue(e, n); |
---|
2235 | } |
---|
2236 | |
---|
2237 | ///Clear the graph. |
---|
2238 | |
---|
2239 | ///This function erases all nodes and arcs from the graph. |
---|
2240 | /// |
---|
2241 | ///\note All iterators of the graph are invalidated, of course. |
---|
2242 | void clear() { |
---|
2243 | Parent::clear(); |
---|
2244 | } |
---|
2245 | |
---|
2246 | /// Reserve memory for nodes. |
---|
2247 | |
---|
2248 | /// Using this function, it is possible to avoid superfluous memory |
---|
2249 | /// allocation: if you know that the graph you want to build will |
---|
2250 | /// be large (e.g. it will contain millions of nodes and/or edges), |
---|
2251 | /// then it is worth reserving space for this amount before starting |
---|
2252 | /// to build the graph. |
---|
2253 | /// \sa reserveEdge() |
---|
2254 | void reserveNode(int n) { _nodes.reserve(n); }; |
---|
2255 | |
---|
2256 | /// Reserve memory for edges. |
---|
2257 | |
---|
2258 | /// Using this function, it is possible to avoid superfluous memory |
---|
2259 | /// allocation: if you know that the graph you want to build will |
---|
2260 | /// be large (e.g. it will contain millions of nodes and/or edges), |
---|
2261 | /// then it is worth reserving space for this amount before starting |
---|
2262 | /// to build the graph. |
---|
2263 | /// \sa reserveNode() |
---|
2264 | void reserveEdge(int m) { _arcs.reserve(2 * m); }; |
---|
2265 | |
---|
2266 | /// \brief Class to make a snapshot of the graph and restore |
---|
2267 | /// it later. |
---|
2268 | /// |
---|
2269 | /// Class to make a snapshot of the graph and restore it later. |
---|
2270 | /// |
---|
2271 | /// The newly added nodes and edges can be removed |
---|
2272 | /// using the restore() function. |
---|
2273 | /// |
---|
2274 | /// \note After a state is restored, you cannot restore a later state, |
---|
2275 | /// i.e. you cannot add the removed nodes and edges again using |
---|
2276 | /// another Snapshot instance. |
---|
2277 | /// |
---|
2278 | /// \warning Node and edge deletions and other modifications |
---|
2279 | /// (e.g. changing the end-nodes of edges or contracting nodes) |
---|
2280 | /// cannot be restored. These events invalidate the snapshot. |
---|
2281 | /// However, the edges and nodes that were added to the graph after |
---|
2282 | /// making the current snapshot can be removed without invalidating it. |
---|
2283 | class Snapshot { |
---|
2284 | protected: |
---|
2285 | |
---|
2286 | typedef Parent::NodeNotifier NodeNotifier; |
---|
2287 | |
---|
2288 | class NodeObserverProxy : public NodeNotifier::ObserverBase { |
---|
2289 | public: |
---|
2290 | |
---|
2291 | NodeObserverProxy(Snapshot& _snapshot) |
---|
2292 | : snapshot(_snapshot) {} |
---|
2293 | |
---|
2294 | using NodeNotifier::ObserverBase::attach; |
---|
2295 | using NodeNotifier::ObserverBase::detach; |
---|
2296 | using NodeNotifier::ObserverBase::attached; |
---|
2297 | |
---|
2298 | protected: |
---|
2299 | |
---|
2300 | virtual void add(const Node& node) { |
---|
2301 | snapshot.addNode(node); |
---|
2302 | } |
---|
2303 | virtual void add(const std::vector<Node>& nodes) { |
---|
2304 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
2305 | snapshot.addNode(nodes[i]); |
---|
2306 | } |
---|
2307 | } |
---|
2308 | virtual void erase(const Node& node) { |
---|
2309 | snapshot.eraseNode(node); |
---|
2310 | } |
---|
2311 | virtual void erase(const std::vector<Node>& nodes) { |
---|
2312 | for (int i = 0; i < int(nodes.size()); ++i) { |
---|
2313 | snapshot.eraseNode(nodes[i]); |
---|
2314 | } |
---|
2315 | } |
---|
2316 | virtual void build() { |
---|
2317 | Node node; |
---|
2318 | std::vector<Node> nodes; |
---|
2319 | for (notifier()->first(node); node != INVALID; |
---|
2320 | notifier()->next(node)) { |
---|
2321 | nodes.push_back(node); |
---|
2322 | } |
---|
2323 | for (int i = nodes.size() - 1; i >= 0; --i) { |
---|
2324 | snapshot.addNode(nodes[i]); |
---|
2325 | } |
---|
2326 | } |
---|
2327 | virtual void clear() { |
---|
2328 | Node node; |
---|
2329 | for (notifier()->first(node); node != INVALID; |
---|
2330 | notifier()->next(node)) { |
---|
2331 | snapshot.eraseNode(node); |
---|
2332 | } |
---|
2333 | } |
---|
2334 | |
---|
2335 | Snapshot& snapshot; |
---|
2336 | }; |
---|
2337 | |
---|
2338 | class EdgeObserverProxy : public EdgeNotifier::ObserverBase { |
---|
2339 | public: |
---|
2340 | |
---|
2341 | EdgeObserverProxy(Snapshot& _snapshot) |
---|
2342 | : snapshot(_snapshot) {} |
---|
2343 | |
---|
2344 | using EdgeNotifier::ObserverBase::attach; |
---|
2345 | using EdgeNotifier::ObserverBase::detach; |
---|
2346 | using EdgeNotifier::ObserverBase::attached; |
---|
2347 | |
---|
2348 | protected: |
---|
2349 | |
---|
2350 | virtual void add(const Edge& edge) { |
---|
2351 | snapshot.addEdge(edge); |
---|
2352 | } |
---|
2353 | virtual void add(const std::vector<Edge>& edges) { |
---|
2354 | for (int i = edges.size() - 1; i >= 0; --i) { |
---|
2355 | snapshot.addEdge(edges[i]); |
---|
2356 | } |
---|
2357 | } |
---|
2358 | virtual void erase(const Edge& edge) { |
---|
2359 | snapshot.eraseEdge(edge); |
---|
2360 | } |
---|
2361 | virtual void erase(const std::vector<Edge>& edges) { |
---|
2362 | for (int i = 0; i < int(edges.size()); ++i) { |
---|
2363 | snapshot.eraseEdge(edges[i]); |
---|
2364 | } |
---|
2365 | } |
---|
2366 | virtual void build() { |
---|
2367 | Edge edge; |
---|
2368 | std::vector<Edge> edges; |
---|
2369 | for (notifier()->first(edge); edge != INVALID; |
---|
2370 | notifier()->next(edge)) { |
---|
2371 | edges.push_back(edge); |
---|
2372 | } |
---|
2373 | for (int i = edges.size() - 1; i >= 0; --i) { |
---|
2374 | snapshot.addEdge(edges[i]); |
---|
2375 | } |
---|
2376 | } |
---|
2377 | virtual void clear() { |
---|
2378 | Edge edge; |
---|
2379 | for (notifier()->first(edge); edge != INVALID; |
---|
2380 | notifier()->next(edge)) { |
---|
2381 | snapshot.eraseEdge(edge); |
---|
2382 | } |
---|
2383 | } |
---|
2384 | |
---|
2385 | Snapshot& snapshot; |
---|
2386 | }; |
---|
2387 | |
---|
2388 | ListBpGraph *graph; |
---|
2389 | |
---|
2390 | NodeObserverProxy node_observer_proxy; |
---|
2391 | EdgeObserverProxy edge_observer_proxy; |
---|
2392 | |
---|
2393 | std::list<Node> added_nodes; |
---|
2394 | std::list<Edge> added_edges; |
---|
2395 | |
---|
2396 | |
---|
2397 | void addNode(const Node& node) { |
---|
2398 | added_nodes.push_front(node); |
---|
2399 | } |
---|
2400 | void eraseNode(const Node& node) { |
---|
2401 | std::list<Node>::iterator it = |
---|
2402 | std::find(added_nodes.begin(), added_nodes.end(), node); |
---|
2403 | if (it == added_nodes.end()) { |
---|
2404 | clear(); |
---|
2405 | edge_observer_proxy.detach(); |
---|
2406 | throw NodeNotifier::ImmediateDetach(); |
---|
2407 | } else { |
---|
2408 | added_nodes.erase(it); |
---|
2409 | } |
---|
2410 | } |
---|
2411 | |
---|
2412 | void addEdge(const Edge& edge) { |
---|
2413 | added_edges.push_front(edge); |
---|
2414 | } |
---|
2415 | void eraseEdge(const Edge& edge) { |
---|
2416 | std::list<Edge>::iterator it = |
---|
2417 | std::find(added_edges.begin(), added_edges.end(), edge); |
---|
2418 | if (it == added_edges.end()) { |
---|
2419 | clear(); |
---|
2420 | node_observer_proxy.detach(); |
---|
2421 | throw EdgeNotifier::ImmediateDetach(); |
---|
2422 | } else { |
---|
2423 | added_edges.erase(it); |
---|
2424 | } |
---|
2425 | } |
---|
2426 | |
---|
2427 | void attach(ListBpGraph &_graph) { |
---|
2428 | graph = &_graph; |
---|
2429 | node_observer_proxy.attach(graph->notifier(Node())); |
---|
2430 | edge_observer_proxy.attach(graph->notifier(Edge())); |
---|
2431 | } |
---|
2432 | |
---|
2433 | void detach() { |
---|
2434 | node_observer_proxy.detach(); |
---|
2435 | edge_observer_proxy.detach(); |
---|
2436 | } |
---|
2437 | |
---|
2438 | bool attached() const { |
---|
2439 | return node_observer_proxy.attached(); |
---|
2440 | } |
---|
2441 | |
---|
2442 | void clear() { |
---|
2443 | added_nodes.clear(); |
---|
2444 | added_edges.clear(); |
---|
2445 | } |
---|
2446 | |
---|
2447 | public: |
---|
2448 | |
---|
2449 | /// \brief Default constructor. |
---|
2450 | /// |
---|
2451 | /// Default constructor. |
---|
2452 | /// You have to call save() to actually make a snapshot. |
---|
2453 | Snapshot() |
---|
2454 | : graph(0), node_observer_proxy(*this), |
---|
2455 | edge_observer_proxy(*this) {} |
---|
2456 | |
---|
2457 | /// \brief Constructor that immediately makes a snapshot. |
---|
2458 | /// |
---|
2459 | /// This constructor immediately makes a snapshot of the given graph. |
---|
2460 | Snapshot(ListBpGraph &gr) |
---|
2461 | : node_observer_proxy(*this), |
---|
2462 | edge_observer_proxy(*this) { |
---|
2463 | attach(gr); |
---|
2464 | } |
---|
2465 | |
---|
2466 | /// \brief Make a snapshot. |
---|
2467 | /// |
---|
2468 | /// This function makes a snapshot of the given graph. |
---|
2469 | /// It can be called more than once. In case of a repeated |
---|
2470 | /// call, the previous snapshot gets lost. |
---|
2471 | void save(ListBpGraph &gr) { |
---|
2472 | if (attached()) { |
---|
2473 | detach(); |
---|
2474 | clear(); |
---|
2475 | } |
---|
2476 | attach(gr); |
---|
2477 | } |
---|
2478 | |
---|
2479 | /// \brief Undo the changes until the last snapshot. |
---|
2480 | /// |
---|
2481 | /// This function undos the changes until the last snapshot |
---|
2482 | /// created by save() or Snapshot(ListBpGraph&). |
---|
2483 | /// |
---|
2484 | /// \warning This method invalidates the snapshot, i.e. repeated |
---|
2485 | /// restoring is not supported unless you call save() again. |
---|
2486 | void restore() { |
---|
2487 | detach(); |
---|
2488 | for(std::list<Edge>::iterator it = added_edges.begin(); |
---|
2489 | it != added_edges.end(); ++it) { |
---|
2490 | graph->erase(*it); |
---|
2491 | } |
---|
2492 | for(std::list<Node>::iterator it = added_nodes.begin(); |
---|
2493 | it != added_nodes.end(); ++it) { |
---|
2494 | graph->erase(*it); |
---|
2495 | } |
---|
2496 | clear(); |
---|
2497 | } |
---|
2498 | |
---|
2499 | /// \brief Returns \c true if the snapshot is valid. |
---|
2500 | /// |
---|
2501 | /// This function returns \c true if the snapshot is valid. |
---|
2502 | bool valid() const { |
---|
2503 | return attached(); |
---|
2504 | } |
---|
2505 | }; |
---|
2506 | }; |
---|
2507 | |
---|
2508 | /// @} |
---|
2509 | } //namespace lemon |
---|
2510 | |
---|
2511 | |
---|
2512 | #endif |
---|