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view-gq.hpp
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37 
38 namespace Gecode { namespace Int { namespace Count {
39 
40  template<class VX, class VY, class VZ, bool shr, bool dom>
43  : ViewBase<VX,VY,VZ>(home,x,y,z,c) {}
44 
45  template<class VX, class VY, class VZ, bool shr, bool dom>
48  ViewArray<VX>& x, VY y, VZ z, int c) {
49  GECODE_ME_CHECK(z.lq(home,x.size()-c));
50  if (isval(y) && z.assigned())
51  return GqInt<VX,VY>::post(home,x,y,z.val()+c);
52  if (sharing(x,y,z))
53  (void) new (home) GqView<VX,VY,VZ,true,dom>(home,x,y,z,c);
54  else
55  (void) new (home) GqView<VX,VY,VZ,false,dom>(home,x,y,z,c);
56  return ES_OK;
57  }
58 
59  template<class VX, class VY, class VZ, bool shr, bool dom>
62  : ViewBase<VX,VY,VZ>(home,p) {}
63 
64  template<class VX, class VY, class VZ, bool shr, bool dom>
65  Actor*
67  return new (home) GqView<VX,VY,VZ,shr,dom>(home,*this);
68  }
69 
70  template<class VX, class VY, class VZ, bool shr, bool dom>
73  count(home);
74 
75  GECODE_ME_CHECK(z.lq(home,atmost()));
76 
77  if (z.min() == atmost()) {
79  return home.ES_SUBSUMED(*this);
80  }
81  if (x.size() == 0)
82  return home.ES_SUBSUMED(*this);
83 
84  if (z.assigned() && (!dom ||isval(y))) {
85  VY yc(y);
86  GECODE_REWRITE(*this,(GqInt<VX,VY>::post(home(*this),x,yc,z.val()+c)));
87  }
88 
89  if (dom && !isval(y) && (z.min() > 0)) {
90  /*
91  * Only if the propagator is at fixpoint here, continue
92  * when things are shared: the reason is that prune
93  * requires that the views in x overlap with y!
94  */
95  if (shr && (VX::me(Propagator::modeventdelta()) != ME_INT_NONE))
96  return ES_NOFIX;
97 
98  GECODE_ES_CHECK(prune(home,x,y));
99 
100  return ES_NOFIX;
101  }
102 
103  return shr ? ES_NOFIX : ES_FIX;
104  }
105 
106 }}}
107 
108 // STATISTICS: int-prop
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition: macros.hpp:120
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3433
VZ z
View which yields result of counting.
Definition: count.hh:277
static bool sharing(const ViewArray< VX > &x, const VY &y, const VZ &z)
Test whether there is sharing of z with x or y.
Definition: view-base.hpp:127
Base-class for count propagators (view)
Definition: count.hh:270
void dom(Home home, FloatVar x, FloatVal n)
Propagates .
Definition: dom.cpp:44
bool isval(VY y)
Return whether y is a value.
Definition: rel.hpp:63
#define forceinline
Definition: config.hpp:182
Propagation has computed fixpoint.
Definition: core.hpp:469
Computation spaces.
Definition: core.hpp:1668
ExecStatus prune(Space &home, ViewArray< VX > &x, ConstIntView)
Definition: rel.hpp:268
Base-class for both propagators and branchers.
Definition: core.hpp:620
Propagator for counting views (greater or equal to number of equal views)
Definition: count.hh:383
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:95
Gecode::FloatVal c(-8, 8)
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
VY y
View to compare to.
Definition: count.hh:275
ViewArray< VX > x
Views still to count.
Definition: count.hh:273
int c
Number of views which are equal and have been eliminated.
Definition: count.hh:279
void count(Space &home)
Count how many views are equal now.
Definition: view-base.hpp:89
Post propagator for SetVar SetOpType SetVar SetRelType SetVar z
Definition: set.hh:769
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:56
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, VZ z, int c)
Post propagator for .
Definition: view-gq.hpp:47
Propagator for counting views (greater or equal integer to number of equal views) ...
Definition: count.hh:206
ModEventDelta modeventdelta(void) const
Return the modification event delta.
Definition: core.hpp:3402
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:769
ExecStatus
Definition: core.hpp:464
GqView(Space &home, GqView &p)
Constructor for cloning p.
Definition: view-gq.hpp:61
Post propagator for SetVar x
Definition: set.hh:769
Execution is okay.
Definition: core.hpp:468
Propagation has not computed fixpoint.
Definition: core.hpp:467
int atmost(void) const
How many views are at most equal.
Definition: view-base.hpp:116
Gecode toplevel namespace
int ModEventDelta
Modification event deltas.
Definition: core.hpp:91
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1203
Home class for posting propagators
Definition: core.hpp:846
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: view-gq.hpp:72
const Gecode::ModEvent ME_INT_NONE
Domain operation has not changed domain.
Definition: var-type.hpp:54
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition: view-gq.hpp:66
ExecStatus post_true(Home home, VX x, ConstIntView y)
Definition: rel.hpp:155