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view.hpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Contributing authors:
7  * Samuel Gagnon <samuel.gagnon92@gmail.com>
8  *
9  * Copyright:
10  * Christian Schulte, 2005
11  * Samuel Gagnon, 2018
12  *
13  * This file is part of Gecode, the generic constraint
14  * development environment:
15  * http://www.gecode.org
16  *
17  * Permission is hereby granted, free of charge, to any person obtaining
18  * a copy of this software and associated documentation files (the
19  * "Software"), to deal in the Software without restriction, including
20  * without limitation the rights to use, copy, modify, merge, publish,
21  * distribute, sublicense, and/or sell copies of the Software, and to
22  * permit persons to whom the Software is furnished to do so, subject to
23  * the following conditions:
24  *
25  * The above copyright notice and this permission notice shall be
26  * included in all copies or substantial portions of the Software.
27  *
28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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34  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35  *
36  */
37 
38 namespace Gecode {
39 
44  template<class View>
45  class ConstView {
46  public:
48  typedef typename View::VarImpType VarImpType;
50  typedef typename View::VarType VarType;
52 
53  unsigned int degree(void) const;
56  double afc(void) const;
58  static bool varderived(void);
60  VarImpType* varimp(void) const;
61 #ifdef GECODE_HAS_CBS
63  unsigned int id(void) const;
64 #endif
66 
68 
69  bool assigned(void) const;
72 
74 
75  static void schedule(Space& home, Propagator& p, ModEvent me);
78  static ModEvent me(const ModEventDelta& med);
82 
84 
85 
92  void subscribe(Space& home, Propagator& p, PropCond pc, bool schedule=true);
94  void cancel(Space& home, Propagator& p, PropCond pc);
96  void reschedule(Space& home, Propagator& p, PropCond pc);
102  void subscribe(Space& home, Advisor& a, bool fail=false);
104  void cancel(Space& home, Advisor& a, bool fail=false);
106 
108 
109  static ModEvent modevent(const Delta& d);
112 
114 
115  void update(Space& home, ConstView& y);
118 
120 
121  bool operator <(const ConstView& y) const;
124  };
125 
126 
127 
132  template<class Var>
133  class VarImpView {
134  public:
136  typedef Var VarType;
138  typedef typename Var::VarImpType VarImpType;
139  protected:
143  VarImpView(void);
147  void varimp(VarImpType* y);
148  public:
150 
151  static bool varderived(void);
154  VarImpType* varimp(void) const;
156  unsigned int degree(void) const;
158  double afc(void) const;
159 #ifdef GECODE_HAS_CBS
161  unsigned int id(void) const;
162 #endif
164 
166 
167  bool assigned(void) const;
170 
172 
173  static void schedule(Space& home, Propagator& p, ModEvent me);
176  static ModEvent me(const ModEventDelta& med);
180 
182 
183 
190  void subscribe(Space& home, Propagator& p, PropCond pc, bool schedule=true);
192  void cancel(Space& home, Propagator& p, PropCond pc);
194  void reschedule(Space& home, Propagator& p, PropCond pc);
200  void subscribe(Space& home, Advisor& a, bool fail=false);
202  void cancel(Space& home, Advisor& a, bool fail=false);
204 
206 
207  static ModEvent modevent(const Delta& d);
210 
212 
213  void update(Space& home, VarImpView<Var>& y);
216 
218 
219  bool operator <(const VarImpView& y) const;
222  };
223 
224 
229  template<class View>
230  class DerivedView {
231  public:
233  typedef typename View::VarImpType VarImpType;
235  typedef typename View::VarType VarType;
236  protected:
238  View x;
240  DerivedView(void);
241  public:
243  DerivedView(const View& y);
245 
246  static bool varderived(void);
249  VarImpType* varimp(void) const;
251  View base(void) const;
253  unsigned int degree(void) const;
255  double afc(void) const;
256 #ifdef GECODE_HAS_CBS
258  unsigned int id(void) const;
259 #endif
261 
263 
264  bool assigned(void) const;
267 
269 
270  static void schedule(Space& home, Propagator& p, ModEvent me);
273  static ModEvent me(const ModEventDelta& med);
277 
279 
280 
287  void subscribe(Space& home, Propagator& p, PropCond pc, bool schedule=true);
289  void cancel(Space& home, Propagator& p, PropCond pc);
291  void reschedule(Space& home, Propagator& p, PropCond pc);
297  void subscribe(Space& home, Advisor& a, bool fail=false);
299  void cancel(Space& home, Advisor& a, bool fail=false);
301 
303 
304  static ModEvent modevent(const Delta& d);
307 
309 
310  void update(Space& home, DerivedView<View>& y);
313 
315 
316  bool operator <(const DerivedView<View>& y) const;
319  };
320 
321 
326  template<class ViewA, class ViewB>
327  bool shared(const ConstView<ViewA>&, const ConstView<ViewB>&);
332  template<class Var, class View>
333  bool shared(const VarImpView<Var>&, const ConstView<View>&);
338  template<class ViewA, class ViewB>
339  bool shared(const DerivedView<ViewA>&, const ConstView<ViewB>&);
344  template<class View, class Var>
345  bool shared(const ConstView<View>&, const VarImpView<Var>&);
350  template<class ViewA, class ViewB>
351  bool shared(const ConstView<ViewA>&, const DerivedView<ViewB>&);
356  template<class VarA, class VarB>
357  bool shared(const VarImpView<VarA>&, const VarImpView<VarB>&);
362  template<class Var, class View>
363  bool shared(const VarImpView<Var>&, const DerivedView<View>&);
368  template<class View, class Var>
369  bool shared(const DerivedView<View>&, const VarImpView<Var>&);
374  template<class ViewA, class ViewB>
375  bool shared(const DerivedView<ViewA>&, const DerivedView<ViewB>&);
376 
377 
378  /*
379  * Constant view: has no variable implementation
380  *
381  */
382  template<class View>
383  forceinline unsigned int
385  return 0;
386  }
387  template<class View>
388  forceinline double
389  ConstView<View>::afc(void) const {
390  return 0.0;
391  }
392  template<class View>
393  forceinline bool
395  return false;
396  }
397  template<class View>
398  forceinline typename View::VarImpType*
400  return NULL;
401  }
402 #ifdef GECODE_HAS_CBS
403  template<class View>
404  forceinline unsigned int
405  ConstView<View>::id(void) const {
406  return 0;
407  }
408 #endif
409  template<class View>
410  forceinline bool
412  return true;
413  }
414  template<class View>
415  forceinline void
417  bool schedule) {
418  if (schedule)
419  View::schedule(home,p,ME_GEN_ASSIGNED);
420  }
421  template<class View>
422  forceinline void
424  }
425  template<class View>
426  forceinline void
428  View::schedule(home,p,ME_GEN_ASSIGNED);
429  }
430  template<class View>
431  forceinline void
433  }
434  template<class View>
435  forceinline void
437  }
438  template<class View>
439  forceinline void
441  View::schedule(home,p,me);
442  }
443  template<class View>
446  return View::me(med);
447  }
448  template<class View>
451  return View::med(me);
452  }
453  template<class View>
456  (void) d;
457  return ME_GEN_NONE;
458  }
459  template<class View>
460  forceinline void
462  }
463  template<class View>
466  return true;
467  }
468 
469 
470  /*
471  * Variable view: contains a pointer to a variable implementation
472  *
473  */
474  template<class Var>
477  : x(NULL) {}
478  template<class Var>
481  : x(y) {}
482  template<class Var>
483  forceinline void
485  x=y;
486  }
487  template<class Var>
488  forceinline bool
490  return true;
491  }
492  template<class Var>
493  forceinline typename Var::VarImpType*
495  return x;
496  }
497  template<class Var>
498  forceinline unsigned int
500  return x->degree();
501  }
502  template<class Var>
503  forceinline double
504  VarImpView<Var>::afc(void) const {
505  return x->afc();
506  }
507 #ifdef GECODE_HAS_CBS
508  template<class Var>
509  forceinline unsigned int
510  VarImpView<Var>::id(void) const {
511  return x->id();
512  }
513 #endif
514  template<class Var>
515  forceinline bool
517  return x->assigned();
518  }
519  template<class Var>
520  forceinline void
522  bool schedule) {
523  x->subscribe(home,p,pc,schedule);
524  }
525  template<class Var>
526  forceinline void
528  x->cancel(home,p,pc);
529  }
530  template<class Var>
531  forceinline void
533  x->reschedule(home,p,pc);
534  }
535  template<class Var>
536  forceinline void
538  x->subscribe(home,a,fail);
539  }
540  template<class Var>
541  forceinline void
542  VarImpView<Var>::cancel(Space& home, Advisor& a, bool fail) {
543  x->cancel(home,a,fail);
544  }
545  template<class Var>
546  forceinline void
548  VarImpType::schedule(home,p,me);
549  }
550  template<class Var>
553  return VarImpType::me(med);
554  }
555  template<class Var>
558  return VarImpType::med(me);
559  }
560  template<class Var>
563  return VarImpType::modevent(d);
564  }
565  template<class Var>
566  forceinline void
568  x = y.x->copy(home);
569  }
570  template<class Var>
573  return this->varimp() < y.varimp();
574  }
575 
576 
577  /*
578  * Derived view: contain the base view from which they are derived
579  *
580  */
581 
582  template<class View>
585 
586  template<class View>
589  : x(y) {}
590 
591  template<class View>
592  forceinline bool
594  return View::varderived();
595  }
596 
597  template<class View>
598  forceinline typename View::VarImpType*
600  return x.varimp();
601  }
602 
603  template<class View>
604  forceinline View
606  return x;
607  }
608 
609  template<class View>
610  forceinline unsigned int
612  return x.degree();
613  }
614  template<class View>
615  forceinline double
617  return x.afc();
618  }
619 #ifdef GECODE_HAS_CBS
620  template<class View>
621  forceinline unsigned int
622  DerivedView<View>::id(void) const {
623  return x.id();
624  }
625 #endif
626  template<class View>
627  forceinline bool
629  return x.assigned();
630  }
631 
632  template<class View>
633  forceinline void
635  return View::schedule(home,p,me);
636  }
637  template<class View>
640  return View::me(med);
641  }
642  template<class View>
645  return View::med(me);
646  }
647 
648  template<class View>
649  forceinline void
651  bool schedule) {
652  x.subscribe(home,p,pc,schedule);
653  }
654  template<class View>
655  forceinline void
657  x.cancel(home,p,pc);
658  }
659  template<class View>
660  forceinline void
662  x.reschedule(home,p,pc);
663  }
664  template<class View>
665  forceinline void
667  x.subscribe(home,a,fail);
668  }
669  template<class View>
670  forceinline void
671  DerivedView<View>::cancel(Space& home, Advisor& a, bool fail) {
672  x.cancel(home,a,fail);
673  }
674  template<class View>
677  return View::modevent(d);
678  }
679  template<class View>
680  forceinline void
682  x.update(home,y.x);
683  }
684  template<class View>
687  return base() < y.base();
688  }
689 
690 
691  /*
692  * Tests whether two views are the same
693  *
694  */
695 
697  template<class ViewA, class ViewB>
698  forceinline bool
699  operator ==(const ConstView<ViewA>&, const ConstView<ViewB>&) {
700  return false;
701  }
703  template<class Var, class View>
704  forceinline bool
705  operator ==(const ConstView<View>&, const VarImpView<Var>&) {
706  return false;
707  }
709  template<class ViewA, class ViewB>
710  forceinline bool
711  operator ==(const ConstView<ViewA>&, const DerivedView<ViewB>&) {
712  return false;
713  }
715  template<class Var, class View>
716  forceinline bool
717  operator ==(const VarImpView<Var>&, const ConstView<View>&) {
718  return false;
719  }
721  template<class Var, class View>
722  forceinline bool
723  operator ==(const VarImpView<Var>&, const DerivedView<View>&) {
724  return false;
725  }
727  template<class ViewX, class ViewY>
728  forceinline bool
729  operator ==(const DerivedView<ViewX>&, const ConstView<ViewY>&) {
730  return false;
731  }
733  template<class View, class Var>
734  forceinline bool
735  operator ==(const DerivedView<View>&, const VarImpView<Var>&) {
736  return false;
737  }
739  template<class ViewX, class ViewY>
740  forceinline bool
741  operator ==(const DerivedView<ViewX>&, const DerivedView<ViewY>&) {
742  return false;
743  }
745  template<class VarX, class VarY>
746  forceinline bool
747  operator ==(const VarImpView<VarX>& x, const VarImpView<VarY>& y) {
748  return x.varimp() == y.varimp();
749  }
750 
752  template<class ViewA, class ViewB>
753  forceinline bool
754  operator !=(const ConstView<ViewA>&, const ConstView<ViewB>&) {
755  return true;
756  }
758  template<class Var, class View>
759  forceinline bool
760  operator !=(const ConstView<View>&, const VarImpView<Var>&) {
761  return true;
762  }
764  template<class ViewA, class ViewB>
765  forceinline bool
766  operator !=(const ConstView<ViewA>&, const DerivedView<ViewB>&) {
767  return true;
768  }
770  template<class Var, class View>
771  forceinline bool
772  operator !=(const VarImpView<Var>&, const ConstView<View>&) {
773  return true;
774  }
776  template<class Var, class View>
777  forceinline bool
778  operator !=(const VarImpView<Var>&, const DerivedView<View>&) {
779  return true;
780  }
782  template<class ViewX, class ViewY>
783  forceinline bool
784  operator !=(const DerivedView<ViewX>&, const ConstView<ViewY>&) {
785  return true;
786  }
788  template<class View, class Var>
789  forceinline bool
790  operator !=(const DerivedView<View>&, const VarImpView<Var>&) {
791  return true;
792  }
794  template<class ViewX, class ViewY>
795  forceinline bool
796  operator !=(const DerivedView<ViewX>&, const DerivedView<ViewY>&) {
797  return true;
798  }
800  template<class VarX, class VarY>
801  forceinline bool
802  operator !=(const VarImpView<VarX>& x, const VarImpView<VarY>& y) {
803  return x.varimp() != y.varimp();
804  }
805 
806 
807  /*
808  * Testing whether two views share the same variable
809  *
810  */
811 
812  template<class ViewA, class ViewB>
813  forceinline bool
815  return false;
816  }
817  template<class Var, class View>
818  forceinline bool
820  return false;
821  }
822  template<class ViewA, class ViewB>
823  forceinline bool
825  return false;
826  }
827  template<class View, class Var>
828  forceinline bool
830  return false;
831  }
832  template<class ViewA, class ViewB>
833  forceinline bool
835  return false;
836  }
837  template<class VarA, class VarB>
838  forceinline bool
840  return (static_cast<VarImpBase*>(x.varimp()) ==
841  static_cast<VarImpBase*>(y.varimp()));
842  }
843  template<class Var, class View>
844  forceinline bool
846  return (View::varderived() &&
847  static_cast<VarImpBase*>(x.varimp()) ==
848  static_cast<VarImpBase*>(y.varimp()));
849  }
850  template<class View, class Var>
851  forceinline bool
853  return (View::varderived() &&
854  static_cast<VarImpBase*>(x.varimp()) ==
855  static_cast<VarImpBase*>(y.varimp()));
856  }
857  template<class ViewA, class ViewB>
858  forceinline bool
860  return (ViewA::varderived() && ViewB::varderived() &&
861  static_cast<VarImpBase*>(x.varimp()) ==
862  static_cast<VarImpBase*>(y.varimp()));
863  }
864 
865 }
866 
867 // STATISTICS: kernel-var
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:249
struct Gecode::@602::NNF::@65::@67 a
For atomic nodes.
Base-class for advisors.
Definition: core.hpp:1292
Base-class for constant views.
Definition: view.hpp:45
void cancel(Space &home, Advisor &a, bool fail=false)
Cancel subscription of advisor a.
Definition: view.hpp:436
double afc(void) const
Return accumulated failure count.
Definition: view.hpp:389
unsigned int degree(void) const
Return degree (number of subscribed propagators and advisors)
Definition: view.hpp:384
void subscribe(Space &home, Propagator &p, PropCond pc, bool schedule=true)
Subscribe propagator p with propagation condition pc to view.
Definition: view.hpp:416
void reschedule(Space &home, Propagator &p, PropCond pc)
Re-schedule propagator p with propagation condition pc.
Definition: view.hpp:427
bool operator<(const ConstView &y) const
Whether this view comes before view y (arbitray order)
Definition: view.hpp:465
static ModEvent modevent(const Delta &d)
Return modification event.
Definition: view.hpp:455
static ModEventDelta med(ModEvent me)
Translate modification event me to modification event delta for view.
Definition: view.hpp:450
void subscribe(Space &home, Advisor &a, bool fail=false)
Subscribe advisor a to view.
Definition: view.hpp:432
bool assigned(void) const
Test whether view is assigned.
Definition: view.hpp:411
static ModEvent me(const ModEventDelta &med)
Return modification event for view type in med.
Definition: view.hpp:445
View::VarImpType VarImpType
The variable implementation type corresponding to the constant view.
Definition: view.hpp:48
static bool varderived(void)
Return whether this view is derived from a VarImpView.
Definition: view.hpp:394
void cancel(Space &home, Propagator &p, PropCond pc)
Cancel subscription of propagator p with propagation condition pc to view.
Definition: view.hpp:423
void update(Space &home, ConstView &y)
Update this view to be a clone of view y.
Definition: view.hpp:461
static void schedule(Space &home, Propagator &p, ModEvent me)
Schedule propagator p with modification event me.
Definition: view.hpp:440
View::VarType VarType
The variable type corresponding to the constant view.
Definition: view.hpp:50
VarImpType * varimp(void) const
Return dummy variable implementation of view.
Definition: view.hpp:399
Generic domain change information to be supplied to advisors.
Definition: core.hpp:204
Base-class for derived views.
Definition: view.hpp:230
View base(void) const
Return view from which this view is derived.
Definition: view.hpp:605
void reschedule(Space &home, Propagator &p, PropCond pc)
Re-schedule propagator p with propagation condition pc.
Definition: view.hpp:661
static ModEvent modevent(const Delta &d)
Return modification event.
Definition: view.hpp:676
void subscribe(Space &home, Advisor &a, bool fail=false)
Subscribe advisor a to view.
Definition: view.hpp:666
void subscribe(Space &home, Propagator &p, PropCond pc, bool schedule=true)
Subscribe propagator p with propagation condition pc to view.
Definition: view.hpp:650
View x
View from which this view is derived.
Definition: view.hpp:238
bool operator<(const DerivedView< View > &y) const
Whether this view comes before view y (arbitray order)
Definition: view.hpp:686
View::VarImpType VarImpType
The variable implementation type belonging to the View.
Definition: view.hpp:233
View::VarType VarType
The variable type belonging to the View.
Definition: view.hpp:235
void cancel(Space &home, Advisor &a, bool fail=false)
Cancel subscription of advisor a.
Definition: view.hpp:671
static bool varderived(void)
Return whether this view is derived from a VarImpView.
Definition: view.hpp:593
DerivedView(void)
Default constructor.
Definition: view.hpp:584
static ModEvent me(const ModEventDelta &med)
Return modification event for view type in med.
Definition: view.hpp:639
bool assigned(void) const
Test whether view is assigned.
Definition: view.hpp:628
VarImpType * varimp(void) const
Return variable implementation of view.
Definition: view.hpp:599
static void schedule(Space &home, Propagator &p, ModEvent me)
Schedule propagator p with modification event me.
Definition: view.hpp:634
unsigned int degree(void) const
Return degree (number of subscribed propagators)
Definition: view.hpp:611
void update(Space &home, DerivedView< View > &y)
Update this view to be a clone of view y.
Definition: view.hpp:681
double afc(void) const
Return accumulated failure count.
Definition: view.hpp:616
DerivedView(const View &y)
Initialize with view y.
Definition: view.hpp:588
void cancel(Space &home, Propagator &p, PropCond pc)
Cancel subscription of propagator p with propagation condition pc to view.
Definition: view.hpp:656
static ModEventDelta med(ModEvent)
Translate modification event me to modification event delta for view.
Definition: view.hpp:644
Base-class for propagators.
Definition: core.hpp:1064
SetVarImp * copy(Space &home)
Return copy of this variable.
Definition: set.hpp:424
Computation spaces.
Definition: core.hpp:1742
Base-class for variable implementations.
Definition: core.hpp:172
VarImp * varimp(void) const
Return variable implementation of variable.
Definition: var.hpp:96
VarImp * x
Pointer to variable implementation.
Definition: var.hpp:50
Base-class for variable implementation views.
Definition: view.hpp:133
void cancel(Space &home, Advisor &a, bool fail=false)
Cancel subscription of advisor a.
Definition: view.hpp:542
void update(Space &home, VarImpView< Var > &y)
Update this view to be a clone of view y.
Definition: view.hpp:567
static ModEventDelta med(ModEvent me)
Translate modification event me to modification event delta for view.
Definition: view.hpp:557
Var VarType
The variable type corresponding to the view.
Definition: view.hpp:136
bool operator<(const VarImpView &y) const
Whether this view comes before view y (arbitray order)
Definition: view.hpp:572
VarImpType * varimp(void) const
Return variable implementation of view.
Definition: view.hpp:494
unsigned int degree(void) const
Return degree (number of subscribed propagators and advisors)
Definition: view.hpp:499
Var::VarImpType VarImpType
The variable implementation type corresponding to the view.
Definition: view.hpp:138
void subscribe(Space &home, Advisor &a, bool fail=false)
Subscribe advisor a to view.
Definition: view.hpp:537
VarImpView(VarImpType *y)
Initialize with variable implementation y.
Definition: view.hpp:480
static ModEvent me(const ModEventDelta &med)
Return modification event for view type in med.
Definition: view.hpp:552
static void schedule(Space &home, Propagator &p, ModEvent me)
Schedule propagator p with modification event me.
Definition: view.hpp:547
void cancel(Space &home, Propagator &p, PropCond pc)
Cancel subscription of propagator p with propagation condition pc to view.
Definition: view.hpp:527
static bool varderived(void)
Return whether this view is derived from a VarImpView.
Definition: view.hpp:489
VarImpView(void)
Default constructor.
Definition: view.hpp:476
double afc(void) const
Return accumulated failure count.
Definition: view.hpp:504
static ModEvent modevent(const Delta &d)
Return modification event.
Definition: view.hpp:562
void reschedule(Space &home, Propagator &p, PropCond pc)
Re-schedule propagator p with propagation condition pc.
Definition: view.hpp:532
bool assigned(void) const
Test whether view is assigned.
Definition: view.hpp:516
void subscribe(Space &home, Propagator &p, PropCond pc, bool schedule=true)
Subscribe propagator p with propagation condition pc to view.
Definition: view.hpp:521
void varimp(VarImpType *y)
Set variable implementation to y.
Definition: view.hpp:484
VarImpType * x
Pointer to variable implementation.
Definition: view.hpp:141
Base class for variables.
Definition: var.hpp:40
const ModEvent ME_GEN_NONE
Generic modification event: no modification.
Definition: core.hpp:67
int PropCond
Type for propagation conditions.
Definition: core.hpp:72
const ModEvent ME_GEN_ASSIGNED
Generic modification event: variable is assigned a value.
Definition: core.hpp:69
int ModEvent
Type for modification events.
Definition: core.hpp:62
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
bool shared(const DerivedView< ViewA > &, const DerivedView< ViewB > &)
Test whether views share same variable.
Definition: view.hpp:859
const double base
Base for geometric restart sequence.
Definition: search.hh:126
Gecode::IntSet d(v, 7)
#define forceinline
Definition: config.hpp:192