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view-lq.hpp
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33 
34 namespace Gecode { namespace Int { namespace Count {
35 
36  template<class VX, class VY, class VZ, bool shr>
39  VY y, VZ z, int c)
40  : ViewBase<VX,VY,VZ>(home,x,y,z,c) {}
41 
42  template<class VX, class VY, class VZ, bool shr>
45  VY y, VZ z, int c) {
46  GECODE_ME_CHECK(z.gq(home,-c));
47  if (z.assigned())
48  return LqInt<VX,VY>::post(home,x,y,z.val()+c);
49  if (sharing(x,y,z))
50  (void) new (home) LqView<VX,VY,VZ,true>(home,x,y,z,c);
51  else
52  (void) new (home) LqView<VX,VY,VZ,false>(home,x,y,z,c);
53  return ES_OK;
54  }
55 
56  template<class VX, class VY, class VZ, bool shr>
59  : ViewBase<VX,VY,VZ>(home,p) {}
60 
61  template<class VX, class VY, class VZ, bool shr>
62  Actor*
64  return new (home) LqView<VX,VY,VZ,shr>(home,*this);
65  }
66 
67  template<class VX, class VY, class VZ, bool shr>
70  count(home);
71  GECODE_ME_CHECK(z.gq(home,atleast()));
72 
73  if (z.max() == atleast()) {
75  return home.ES_SUBSUMED(*this);
76  }
77 
78  if (x.size() == 0)
79  return home.ES_SUBSUMED(*this);
80 
81  if (z.assigned()) {
82  VY yc(y);
83  GECODE_REWRITE(*this,(LqInt<VX,VY>::post(home(*this),x,yc,z.val()+c)));
84  }
85 
86  return shr ? ES_NOFIX : ES_FIX;
87  }
88 
89 }}}
90 
91 // STATISTICS: int-prop
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition: macros.hpp:116
int atleast(void) const
How many views are at least equal.
Definition: view-base.hpp:106
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3490
VZ z
View which yields result of counting.
Definition: count.hh:273
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:123
Base-class for count propagators (view)
Definition: count.hh:266
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition: view-lq.hpp:63
#define forceinline
Definition: config.hpp:185
Propagation has computed fixpoint.
Definition: core.hpp:476
Computation spaces.
Definition: core.hpp:1701
Base-class for both propagators and branchers.
Definition: core.hpp:627
Propagator for counting views (less or equal integer to number of equal views)
Definition: count.hh:232
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:91
Gecode::FloatVal c(-8, 8)
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
VY y
View to compare to.
Definition: count.hh:271
ViewArray< VX > x
Views still to count.
Definition: count.hh:269
int c
Number of views which are equal and have been eliminated.
Definition: count.hh:275
void count(Space &home)
Count how many views are equal now.
Definition: view-base.hpp:85
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, VZ z, int c)
Post propagator for .
Definition: view-lq.hpp:44
Propagator for counting views (less or equal to number of equal views)
Definition: count.hh:344
Post propagator for SetVar SetOpType SetVar SetRelType SetVar z
Definition: set.hh:767
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:52
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: view-lq.hpp:69
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
LqView(Space &home, LqView &p)
Constructor for cloning p.
Definition: view-lq.hpp:58
ExecStatus
Definition: core.hpp:471
Post propagator for SetVar x
Definition: set.hh:767
Execution is okay.
Definition: core.hpp:475
Propagation has not computed fixpoint.
Definition: core.hpp:474
Gecode toplevel namespace
ExecStatus post_false(Home home, VX x, ConstIntView y)
Definition: rel.hpp:194
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1138
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
Home class for posting propagators
Definition: core.hpp:853