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view-gq.hpp
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3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
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7  * Christian Schulte, 2003
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33 
34 namespace Gecode { namespace Int { namespace Count {
35 
36  template<class VX, class VY, class VZ, bool shr, bool dom>
39  : ViewBase<VX,VY,VZ>(home,x,y,z,c) {}
40 
41  template<class VX, class VY, class VZ, bool shr, bool dom>
44  ViewArray<VX>& x, VY y, VZ z, int c) {
45  GECODE_ME_CHECK(z.lq(home,x.size()-c));
46  if (isval(y) && z.assigned())
47  return GqInt<VX,VY>::post(home,x,y,z.val()+c);
48  if (sharing(x,y,z))
49  (void) new (home) GqView<VX,VY,VZ,true,dom>(home,x,y,z,c);
50  else
51  (void) new (home) GqView<VX,VY,VZ,false,dom>(home,x,y,z,c);
52  return ES_OK;
53  }
54 
55  template<class VX, class VY, class VZ, bool shr, bool dom>
58  : ViewBase<VX,VY,VZ>(home,p) {}
59 
60  template<class VX, class VY, class VZ, bool shr, bool dom>
61  Actor*
63  return new (home) GqView<VX,VY,VZ,shr,dom>(home,*this);
64  }
65 
66  template<class VX, class VY, class VZ, bool shr, bool dom>
69  count(home);
70 
71  GECODE_ME_CHECK(z.lq(home,atmost()));
72 
73  if (z.min() == atmost()) {
75  return home.ES_SUBSUMED(*this);
76  }
77  if (x.size() == 0)
78  return home.ES_SUBSUMED(*this);
79 
80  if (z.assigned() && (!dom ||isval(y))) {
81  VY yc(y);
82  GECODE_REWRITE(*this,(GqInt<VX,VY>::post(home(*this),x,yc,z.val()+c)));
83  }
84 
85  if (dom && !isval(y) && (z.min() > 0)) {
86  /*
87  * Only if the propagator is at fixpoint here, continue
88  * when things are shared: the reason is that prune
89  * requires that the views in x overlap with y!
90  */
91  if (shr && (VX::me(Propagator::modeventdelta()) != ME_INT_NONE))
92  return ES_NOFIX;
93 
94  GECODE_ES_CHECK(prune(home,x,y));
95 
96  return ES_NOFIX;
97  }
98 
99  return shr ? ES_NOFIX : ES_FIX;
100  }
101 
102 }}}
103 
104 // STATISTICS: int-prop
Post propagator for SetVar x
Definition: set.hh:767
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3563
Base-class for count propagators (view)
Definition: count.hh:266
const Gecode::ModEvent ME_INT_NONE
Domain operation has not changed domain.
Definition: var-type.hpp:54
Post propagator for SetVar SetOpType SetVar SetRelType SetVar z
Definition: set.hh:767
Computation spaces.
Definition: core.hpp:1742
Base-class for both propagators and branchers.
Definition: core.hpp:628
bool assigned(void) const
Test whether view is assigned.
Definition: var.hpp:111
void atmost(Home home, const IntVarArgs &x, int n, int m, IntPropLevel ipl)
Post constraint .
Definition: aliases.hpp:39
Gecode toplevel namespace
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:91
Propagator for counting views (greater or equal integer to number of equal views)
Definition: count.hh:202
Home class for posting propagators
Definition: core.hpp:856
void dom(Home home, FloatVar x, FloatVal n)
Propagates .
Definition: dom.cpp:40
ExecStatus post_true(Home home, VX x, ConstIntView y)
Definition: rel.hpp:151
ModEventDelta modeventdelta(void) const
Return the modification event delta.
Definition: core.hpp:3520
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: view-gq.hpp:68
bool isval(VY y)
Return whether y is a value.
Definition: rel.hpp:59
ExecStatus prune(Space &home, ViewArray< VX > &x, ConstIntView)
Definition: rel.hpp:264
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition: view-gq.hpp:62
GqView(Space &home, GqView &p)
Constructor for cloning p.
Definition: view-gq.hpp:57
void count(Home home, const IntVarArgs &x, int n, IntRelType irt, int m, IntPropLevel)
Post propagator for .
Definition: count.cpp:40
Propagation has computed fixpoint.
Definition: core.hpp:477
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, VZ z, int c)
Post propagator for .
Definition: view-gq.hpp:43
#define forceinline
Definition: config.hpp:185
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:52
Gecode::FloatVal c(-8, 8)
Propagator for counting views (greater or equal to number of equal views)
Definition: count.hh:379
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
Propagation has not computed fixpoint.
Definition: core.hpp:475
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition: macros.hpp:116
Execution is okay.
Definition: core.hpp:476
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
ExecStatus
Definition: core.hpp:472