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view-lq.hpp
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2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2003
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10  * $Date: 2011-08-29 14:59:24 +0200 (Mon, 29 Aug 2011) $ by $Author: schulte $
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37 
38 namespace Gecode { namespace Int { namespace Count {
39 
40  template<class VX, class VY, class VZ, bool shr>
43  VY y, VZ z, int c)
44  : ViewBase<VX,VY,VZ>(home,x,y,z,c) {}
45 
46  template<class VX, class VY, class VZ, bool shr>
49  VY y, VZ z, int c) {
50  GECODE_ME_CHECK(z.gq(home,-c));
51  if (z.assigned())
52  return LqInt<VX,VY>::post(home,x,y,z.val()+c);
53  if (sharing(x,y,z))
54  (void) new (home) LqView<VX,VY,VZ,true>(home,x,y,z,c);
55  else
56  (void) new (home) LqView<VX,VY,VZ,false>(home,x,y,z,c);
57  return ES_OK;
58  }
59 
60  template<class VX, class VY, class VZ, bool shr>
64  : ViewBase<VX,VY,VZ>(home,share,p) {}
65 
66  template<class VX, class VY, class VZ, bool shr>
67  Actor*
68  LqView<VX,VY,VZ,shr>::copy(Space& home, bool share) {
69  return new (home) LqView<VX,VY,VZ,shr>(home,share,*this);
70  }
71 
72  template<class VX, class VY, class VZ, bool shr>
75  count(home);
76  GECODE_ME_CHECK(z.gq(home,atleast()));
77 
78  if (z.max() == atleast()) {
80  return home.ES_SUBSUMED(*this);
81  }
82 
83  if (x.size() == 0)
84  return home.ES_SUBSUMED(*this);
85 
86  if (z.assigned()) {
87  VY yc(y);
88  GECODE_REWRITE(*this,(LqInt<VX,VY>::post(home(*this),x,yc,z.val()+c)));
89  }
90 
91  return shr ? ES_NOFIX : ES_FIX;
92  }
93 
94 }}}
95 
96 // STATISTICS: int-prop
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition: macros.hpp:120
int atleast(void) const
How many views are at least equal.
Definition: view-base.hpp:110
LqView(Space &home, bool share, LqView &p)
Constructor for cloning p.
Definition: view-lq.hpp:62
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3614
VZ z
View which yields result of counting.
Definition: count.hh:274
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:267
Propagation has computed fixpoint.
Definition: core.hpp:545
Computation spaces.
Definition: core.hpp:1748
Base-class for both propagators and branchers.
Definition: core.hpp:696
Propagator for counting views (less or equal integer to number of equal views)
Definition: count.hh:233
#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:272
ViewArray< VX > x
Views still to count.
Definition: count.hh:270
int c
Number of views which are equal and have been eliminated.
Definition: count.hh:276
void count(Space &home)
Count how many views are equal now.
Definition: view-base.hpp:89
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, VZ z, int c)
Post propagator for .
Definition: view-lq.hpp:48
Propagator for counting views (less or equal to number of equal views)
Definition: count.hh:345
Post propagator for SetVar SetOpType SetVar SetRelType SetVar z
Definition: set.hh:784
virtual Actor * copy(Space &home, bool share)
Create copy during cloning.
Definition: view-lq.hpp:68
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:56
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: view-lq.hpp:74
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:784
ExecStatus
Definition: core.hpp:540
#define forceinline
Definition: config.hpp:173
Post propagator for SetVar x
Definition: set.hh:784
Execution is okay.
Definition: core.hpp:544
Propagation has not computed fixpoint.
Definition: core.hpp:543
Gecode toplevel namespace
ExecStatus post_false(Home home, VX x, ConstIntView y)
Definition: rel.hpp:187
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1215
int ModEventDelta
Modification event deltas.
Definition: core.hpp:169
Home class for posting propagators
Definition: core.hpp:922