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) 2003-2008 |
---|
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_BITS_BASE_EXTENDER_H |
---|
20 | #define LEMON_BITS_BASE_EXTENDER_H |
---|
21 | |
---|
22 | #include <lemon/bits/invalid.h> |
---|
23 | #include <lemon/error.h> |
---|
24 | |
---|
25 | #include <lemon/bits/map_extender.h> |
---|
26 | #include <lemon/bits/default_map.h> |
---|
27 | |
---|
28 | #include <lemon/concept_check.h> |
---|
29 | #include <lemon/concepts/maps.h> |
---|
30 | |
---|
31 | ///\ingroup digraphbits |
---|
32 | ///\file |
---|
33 | ///\brief Extenders for the digraph types |
---|
34 | namespace lemon { |
---|
35 | |
---|
36 | /// \ingroup digraphbits |
---|
37 | /// |
---|
38 | /// \brief BaseDigraph to BaseGraph extender |
---|
39 | template <typename Base> |
---|
40 | class UndirDigraphExtender : public Base { |
---|
41 | |
---|
42 | public: |
---|
43 | |
---|
44 | typedef Base Parent; |
---|
45 | typedef typename Parent::Arc Edge; |
---|
46 | typedef typename Parent::Node Node; |
---|
47 | |
---|
48 | typedef True UndirectedTag; |
---|
49 | |
---|
50 | class Arc : public Edge { |
---|
51 | friend class UndirDigraphExtender; |
---|
52 | |
---|
53 | protected: |
---|
54 | bool forward; |
---|
55 | |
---|
56 | Arc(const Edge &ue, bool _forward) : |
---|
57 | Edge(ue), forward(_forward) {} |
---|
58 | |
---|
59 | public: |
---|
60 | Arc() {} |
---|
61 | |
---|
62 | /// Invalid arc constructor |
---|
63 | Arc(Invalid i) : Edge(i), forward(true) {} |
---|
64 | |
---|
65 | bool operator==(const Arc &that) const { |
---|
66 | return forward==that.forward && Edge(*this)==Edge(that); |
---|
67 | } |
---|
68 | bool operator!=(const Arc &that) const { |
---|
69 | return forward!=that.forward || Edge(*this)!=Edge(that); |
---|
70 | } |
---|
71 | bool operator<(const Arc &that) const { |
---|
72 | return forward<that.forward || |
---|
73 | (!(that.forward<forward) && Edge(*this)<Edge(that)); |
---|
74 | } |
---|
75 | }; |
---|
76 | |
---|
77 | |
---|
78 | |
---|
79 | using Parent::source; |
---|
80 | |
---|
81 | /// Source of the given Arc. |
---|
82 | Node source(const Arc &e) const { |
---|
83 | return e.forward ? Parent::source(e) : Parent::target(e); |
---|
84 | } |
---|
85 | |
---|
86 | using Parent::target; |
---|
87 | |
---|
88 | /// Target of the given Arc. |
---|
89 | Node target(const Arc &e) const { |
---|
90 | return e.forward ? Parent::target(e) : Parent::source(e); |
---|
91 | } |
---|
92 | |
---|
93 | /// \brief Directed arc from an edge. |
---|
94 | /// |
---|
95 | /// Returns a directed arc corresponding to the specified Edge. |
---|
96 | /// If the given bool is true the given edge and the |
---|
97 | /// returned arc have the same source node. |
---|
98 | static Arc direct(const Edge &ue, bool d) { |
---|
99 | return Arc(ue, d); |
---|
100 | } |
---|
101 | |
---|
102 | /// Returns whether the given directed arc is same orientation as the |
---|
103 | /// corresponding edge. |
---|
104 | /// |
---|
105 | /// \todo reference to the corresponding point of the undirected digraph |
---|
106 | /// concept. "What does the direction of an edge mean?" |
---|
107 | static bool direction(const Arc &e) { return e.forward; } |
---|
108 | |
---|
109 | |
---|
110 | using Parent::first; |
---|
111 | using Parent::next; |
---|
112 | |
---|
113 | void first(Arc &e) const { |
---|
114 | Parent::first(e); |
---|
115 | e.forward=true; |
---|
116 | } |
---|
117 | |
---|
118 | void next(Arc &e) const { |
---|
119 | if( e.forward ) { |
---|
120 | e.forward = false; |
---|
121 | } |
---|
122 | else { |
---|
123 | Parent::next(e); |
---|
124 | e.forward = true; |
---|
125 | } |
---|
126 | } |
---|
127 | |
---|
128 | void firstOut(Arc &e, const Node &n) const { |
---|
129 | Parent::firstIn(e,n); |
---|
130 | if( Edge(e) != INVALID ) { |
---|
131 | e.forward = false; |
---|
132 | } |
---|
133 | else { |
---|
134 | Parent::firstOut(e,n); |
---|
135 | e.forward = true; |
---|
136 | } |
---|
137 | } |
---|
138 | void nextOut(Arc &e) const { |
---|
139 | if( ! e.forward ) { |
---|
140 | Node n = Parent::target(e); |
---|
141 | Parent::nextIn(e); |
---|
142 | if( Edge(e) == INVALID ) { |
---|
143 | Parent::firstOut(e, n); |
---|
144 | e.forward = true; |
---|
145 | } |
---|
146 | } |
---|
147 | else { |
---|
148 | Parent::nextOut(e); |
---|
149 | } |
---|
150 | } |
---|
151 | |
---|
152 | void firstIn(Arc &e, const Node &n) const { |
---|
153 | Parent::firstOut(e,n); |
---|
154 | if( Edge(e) != INVALID ) { |
---|
155 | e.forward = false; |
---|
156 | } |
---|
157 | else { |
---|
158 | Parent::firstIn(e,n); |
---|
159 | e.forward = true; |
---|
160 | } |
---|
161 | } |
---|
162 | void nextIn(Arc &e) const { |
---|
163 | if( ! e.forward ) { |
---|
164 | Node n = Parent::source(e); |
---|
165 | Parent::nextOut(e); |
---|
166 | if( Edge(e) == INVALID ) { |
---|
167 | Parent::firstIn(e, n); |
---|
168 | e.forward = true; |
---|
169 | } |
---|
170 | } |
---|
171 | else { |
---|
172 | Parent::nextIn(e); |
---|
173 | } |
---|
174 | } |
---|
175 | |
---|
176 | void firstInc(Edge &e, bool &d, const Node &n) const { |
---|
177 | d = true; |
---|
178 | Parent::firstOut(e, n); |
---|
179 | if (e != INVALID) return; |
---|
180 | d = false; |
---|
181 | Parent::firstIn(e, n); |
---|
182 | } |
---|
183 | |
---|
184 | void nextInc(Edge &e, bool &d) const { |
---|
185 | if (d) { |
---|
186 | Node s = Parent::source(e); |
---|
187 | Parent::nextOut(e); |
---|
188 | if (e != INVALID) return; |
---|
189 | d = false; |
---|
190 | Parent::firstIn(e, s); |
---|
191 | } else { |
---|
192 | Parent::nextIn(e); |
---|
193 | } |
---|
194 | } |
---|
195 | |
---|
196 | Node nodeFromId(int ix) const { |
---|
197 | return Parent::nodeFromId(ix); |
---|
198 | } |
---|
199 | |
---|
200 | Arc arcFromId(int ix) const { |
---|
201 | return direct(Parent::arcFromId(ix >> 1), bool(ix & 1)); |
---|
202 | } |
---|
203 | |
---|
204 | Edge edgeFromId(int ix) const { |
---|
205 | return Parent::arcFromId(ix); |
---|
206 | } |
---|
207 | |
---|
208 | int id(const Node &n) const { |
---|
209 | return Parent::id(n); |
---|
210 | } |
---|
211 | |
---|
212 | int id(const Edge &e) const { |
---|
213 | return Parent::id(e); |
---|
214 | } |
---|
215 | |
---|
216 | int id(const Arc &e) const { |
---|
217 | return 2 * Parent::id(e) + int(e.forward); |
---|
218 | } |
---|
219 | |
---|
220 | int maxNodeId() const { |
---|
221 | return Parent::maxNodeId(); |
---|
222 | } |
---|
223 | |
---|
224 | int maxArcId() const { |
---|
225 | return 2 * Parent::maxArcId() + 1; |
---|
226 | } |
---|
227 | |
---|
228 | int maxEdgeId() const { |
---|
229 | return Parent::maxArcId(); |
---|
230 | } |
---|
231 | |
---|
232 | |
---|
233 | int arcNum() const { |
---|
234 | return 2 * Parent::arcNum(); |
---|
235 | } |
---|
236 | |
---|
237 | int edgeNum() const { |
---|
238 | return Parent::arcNum(); |
---|
239 | } |
---|
240 | |
---|
241 | Arc findArc(Node s, Node t, Arc p = INVALID) const { |
---|
242 | if (p == INVALID) { |
---|
243 | Edge arc = Parent::findArc(s, t); |
---|
244 | if (arc != INVALID) return direct(arc, true); |
---|
245 | arc = Parent::findArc(t, s); |
---|
246 | if (arc != INVALID) return direct(arc, false); |
---|
247 | } else if (direction(p)) { |
---|
248 | Edge arc = Parent::findArc(s, t, p); |
---|
249 | if (arc != INVALID) return direct(arc, true); |
---|
250 | arc = Parent::findArc(t, s); |
---|
251 | if (arc != INVALID) return direct(arc, false); |
---|
252 | } else { |
---|
253 | Edge arc = Parent::findArc(t, s, p); |
---|
254 | if (arc != INVALID) return direct(arc, false); |
---|
255 | } |
---|
256 | return INVALID; |
---|
257 | } |
---|
258 | |
---|
259 | Edge findEdge(Node s, Node t, Edge p = INVALID) const { |
---|
260 | if (s != t) { |
---|
261 | if (p == INVALID) { |
---|
262 | Edge arc = Parent::findArc(s, t); |
---|
263 | if (arc != INVALID) return arc; |
---|
264 | arc = Parent::findArc(t, s); |
---|
265 | if (arc != INVALID) return arc; |
---|
266 | } else if (Parent::s(p) == s) { |
---|
267 | Edge arc = Parent::findArc(s, t, p); |
---|
268 | if (arc != INVALID) return arc; |
---|
269 | arc = Parent::findArc(t, s); |
---|
270 | if (arc != INVALID) return arc; |
---|
271 | } else { |
---|
272 | Edge arc = Parent::findArc(t, s, p); |
---|
273 | if (arc != INVALID) return arc; |
---|
274 | } |
---|
275 | } else { |
---|
276 | return Parent::findArc(s, t, p); |
---|
277 | } |
---|
278 | return INVALID; |
---|
279 | } |
---|
280 | }; |
---|
281 | |
---|
282 | template <typename Base> |
---|
283 | class BidirBpGraphExtender : public Base { |
---|
284 | public: |
---|
285 | typedef Base Parent; |
---|
286 | typedef BidirBpGraphExtender Digraph; |
---|
287 | |
---|
288 | typedef typename Parent::Node Node; |
---|
289 | typedef typename Parent::Edge Edge; |
---|
290 | |
---|
291 | |
---|
292 | using Parent::first; |
---|
293 | using Parent::next; |
---|
294 | |
---|
295 | using Parent::id; |
---|
296 | |
---|
297 | class Red : public Node { |
---|
298 | friend class BidirBpGraphExtender; |
---|
299 | public: |
---|
300 | Red() {} |
---|
301 | Red(const Node& node) : Node(node) { |
---|
302 | LEMON_ASSERT(Parent::red(node) || node == INVALID, |
---|
303 | typename Parent::NodeSetError()); |
---|
304 | } |
---|
305 | Red& operator=(const Node& node) { |
---|
306 | LEMON_ASSERT(Parent::red(node) || node == INVALID, |
---|
307 | typename Parent::NodeSetError()); |
---|
308 | Node::operator=(node); |
---|
309 | return *this; |
---|
310 | } |
---|
311 | Red(Invalid) : Node(INVALID) {} |
---|
312 | Red& operator=(Invalid) { |
---|
313 | Node::operator=(INVALID); |
---|
314 | return *this; |
---|
315 | } |
---|
316 | }; |
---|
317 | |
---|
318 | void first(Red& node) const { |
---|
319 | Parent::firstRed(static_cast<Node&>(node)); |
---|
320 | } |
---|
321 | void next(Red& node) const { |
---|
322 | Parent::nextRed(static_cast<Node&>(node)); |
---|
323 | } |
---|
324 | |
---|
325 | int id(const Red& node) const { |
---|
326 | return Parent::redId(node); |
---|
327 | } |
---|
328 | |
---|
329 | class Blue : public Node { |
---|
330 | friend class BidirBpGraphExtender; |
---|
331 | public: |
---|
332 | Blue() {} |
---|
333 | Blue(const Node& node) : Node(node) { |
---|
334 | LEMON_ASSERT(Parent::blue(node) || node == INVALID, |
---|
335 | typename Parent::NodeSetError()); |
---|
336 | } |
---|
337 | Blue& operator=(const Node& node) { |
---|
338 | LEMON_ASSERT(Parent::blue(node) || node == INVALID, |
---|
339 | typename Parent::NodeSetError()); |
---|
340 | Node::operator=(node); |
---|
341 | return *this; |
---|
342 | } |
---|
343 | Blue(Invalid) : Node(INVALID) {} |
---|
344 | Blue& operator=(Invalid) { |
---|
345 | Node::operator=(INVALID); |
---|
346 | return *this; |
---|
347 | } |
---|
348 | }; |
---|
349 | |
---|
350 | void first(Blue& node) const { |
---|
351 | Parent::firstBlue(static_cast<Node&>(node)); |
---|
352 | } |
---|
353 | void next(Blue& node) const { |
---|
354 | Parent::nextBlue(static_cast<Node&>(node)); |
---|
355 | } |
---|
356 | |
---|
357 | int id(const Blue& node) const { |
---|
358 | return Parent::redId(node); |
---|
359 | } |
---|
360 | |
---|
361 | Node source(const Edge& arc) const { |
---|
362 | return red(arc); |
---|
363 | } |
---|
364 | Node target(const Edge& arc) const { |
---|
365 | return blue(arc); |
---|
366 | } |
---|
367 | |
---|
368 | void firstInc(Edge& arc, bool& dir, const Node& node) const { |
---|
369 | if (Parent::red(node)) { |
---|
370 | Parent::firstFromRed(arc, node); |
---|
371 | dir = true; |
---|
372 | } else { |
---|
373 | Parent::firstFromBlue(arc, node); |
---|
374 | dir = static_cast<Edge&>(arc) == INVALID; |
---|
375 | } |
---|
376 | } |
---|
377 | void nextInc(Edge& arc, bool& dir) const { |
---|
378 | if (dir) { |
---|
379 | Parent::nextFromRed(arc); |
---|
380 | } else { |
---|
381 | Parent::nextFromBlue(arc); |
---|
382 | if (arc == INVALID) dir = true; |
---|
383 | } |
---|
384 | } |
---|
385 | |
---|
386 | class Arc : public Edge { |
---|
387 | friend class BidirBpGraphExtender; |
---|
388 | protected: |
---|
389 | bool forward; |
---|
390 | |
---|
391 | Arc(const Edge& arc, bool _forward) |
---|
392 | : Edge(arc), forward(_forward) {} |
---|
393 | |
---|
394 | public: |
---|
395 | Arc() {} |
---|
396 | Arc (Invalid) : Edge(INVALID), forward(true) {} |
---|
397 | bool operator==(const Arc& i) const { |
---|
398 | return Edge::operator==(i) && forward == i.forward; |
---|
399 | } |
---|
400 | bool operator!=(const Arc& i) const { |
---|
401 | return Edge::operator!=(i) || forward != i.forward; |
---|
402 | } |
---|
403 | bool operator<(const Arc& i) const { |
---|
404 | return Edge::operator<(i) || |
---|
405 | (!(i.forward<forward) && Edge(*this)<Edge(i)); |
---|
406 | } |
---|
407 | }; |
---|
408 | |
---|
409 | void first(Arc& arc) const { |
---|
410 | Parent::first(static_cast<Edge&>(arc)); |
---|
411 | arc.forward = true; |
---|
412 | } |
---|
413 | |
---|
414 | void next(Arc& arc) const { |
---|
415 | if (!arc.forward) { |
---|
416 | Parent::next(static_cast<Edge&>(arc)); |
---|
417 | } |
---|
418 | arc.forward = !arc.forward; |
---|
419 | } |
---|
420 | |
---|
421 | void firstOut(Arc& arc, const Node& node) const { |
---|
422 | if (Parent::red(node)) { |
---|
423 | Parent::firstFromRed(arc, node); |
---|
424 | arc.forward = true; |
---|
425 | } else { |
---|
426 | Parent::firstFromBlue(arc, node); |
---|
427 | arc.forward = static_cast<Edge&>(arc) == INVALID; |
---|
428 | } |
---|
429 | } |
---|
430 | void nextOut(Arc& arc) const { |
---|
431 | if (arc.forward) { |
---|
432 | Parent::nextFromRed(arc); |
---|
433 | } else { |
---|
434 | Parent::nextFromBlue(arc); |
---|
435 | arc.forward = static_cast<Edge&>(arc) == INVALID; |
---|
436 | } |
---|
437 | } |
---|
438 | |
---|
439 | void firstIn(Arc& arc, const Node& node) const { |
---|
440 | if (Parent::blue(node)) { |
---|
441 | Parent::firstFromBlue(arc, node); |
---|
442 | arc.forward = true; |
---|
443 | } else { |
---|
444 | Parent::firstFromRed(arc, node); |
---|
445 | arc.forward = static_cast<Edge&>(arc) == INVALID; |
---|
446 | } |
---|
447 | } |
---|
448 | void nextIn(Arc& arc) const { |
---|
449 | if (arc.forward) { |
---|
450 | Parent::nextFromBlue(arc); |
---|
451 | } else { |
---|
452 | Parent::nextFromRed(arc); |
---|
453 | arc.forward = static_cast<Edge&>(arc) == INVALID; |
---|
454 | } |
---|
455 | } |
---|
456 | |
---|
457 | Node source(const Arc& arc) const { |
---|
458 | return arc.forward ? Parent::red(arc) : Parent::blue(arc); |
---|
459 | } |
---|
460 | Node target(const Arc& arc) const { |
---|
461 | return arc.forward ? Parent::blue(arc) : Parent::red(arc); |
---|
462 | } |
---|
463 | |
---|
464 | int id(const Arc& arc) const { |
---|
465 | return (Parent::id(static_cast<const Edge&>(arc)) << 1) + |
---|
466 | (arc.forward ? 0 : 1); |
---|
467 | } |
---|
468 | Arc arcFromId(int ix) const { |
---|
469 | return Arc(Parent::fromEdgeId(ix >> 1), (ix & 1) == 0); |
---|
470 | } |
---|
471 | int maxArcId() const { |
---|
472 | return (Parent::maxEdgeId() << 1) + 1; |
---|
473 | } |
---|
474 | |
---|
475 | bool direction(const Arc& arc) const { |
---|
476 | return arc.forward; |
---|
477 | } |
---|
478 | |
---|
479 | Arc direct(const Edge& arc, bool dir) const { |
---|
480 | return Arc(arc, dir); |
---|
481 | } |
---|
482 | |
---|
483 | int arcNum() const { |
---|
484 | return 2 * Parent::edgeNum(); |
---|
485 | } |
---|
486 | |
---|
487 | int edgeNum() const { |
---|
488 | return Parent::edgeNum(); |
---|
489 | } |
---|
490 | |
---|
491 | |
---|
492 | }; |
---|
493 | } |
---|
494 | |
---|
495 | #endif |
---|