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view-eq.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  ViewArray<VX>& x, 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, bool dom>
45  ViewArray<VX>& x, VY y, VZ z, int c) {
46  GECODE_ME_CHECK(z.gq(home,-c));
47  GECODE_ME_CHECK(z.lq(home,x.size()-c));
48  if (isval(y) && z.assigned())
49  return EqInt<VX,VY>::post(home,x,y,z.val()+c);
50  if (sharing(x,y,z))
51  (void) new (home) EqView<VX,VY,VZ,true,dom>(home,x,y,z,c);
52  else
53  (void) new (home) EqView<VX,VY,VZ,false,dom>(home,x,y,z,c);
54  return ES_OK;
55  }
56 
57  template<class VX, class VY, class VZ, bool shr, bool dom>
60  : ViewBase<VX,VY,VZ>(home,p) {}
61 
62  template<class VX, class VY, class VZ, bool shr, bool dom>
63  Actor*
65  return new (home) EqView<VX,VY,VZ,shr,dom>(home,*this);
66  }
67 
68  template<class VX, class VY, class VZ, bool shr, bool dom>
71  count(home);
72 
73  GECODE_ME_CHECK(z.gq(home,atleast()));
74  GECODE_ME_CHECK(z.lq(home,atmost()));
75 
76  if (z.assigned()) {
77  if (z.val() == atleast()) {
79  return home.ES_SUBSUMED(*this);
80  }
81  if (z.val() == atmost()) {
83  return home.ES_SUBSUMED(*this);
84  }
85  if (!dom || isval(y)) {
86  VY yc(y);
88  ::post(home(*this),x,yc,z.val()+c)));
89  }
90  }
91 
92 
93  if (dom && !isval(y) && (z.min() > 0)) {
94  /*
95  * Only if the propagator is at fixpoint here, continue
96  * when things are shared: the reason is that prune
97  * requires that the views in x overlap with y!
98  */
99  if (shr && (VX::me(Propagator::modeventdelta()) != ME_INT_NONE))
100  return ES_NOFIX;
101 
102  GECODE_ES_CHECK(prune(home,x,y));
103 
104  return ES_NOFIX;
105  }
106 
107  return shr ? ES_NOFIX : ES_FIX;
108  }
109 
110 }}}
111 
112 // 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
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: view-eq.hpp:70
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
void dom(Home home, FloatVar x, FloatVal n)
Propagates .
Definition: dom.cpp:40
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition: view-eq.hpp:64
bool isval(VY y)
Return whether y is a value.
Definition: rel.hpp:59
Propagator for counting views (equal to number of equal views)
Definition: count.hh:309
#define forceinline
Definition: config.hpp:185
Propagation has computed fixpoint.
Definition: core.hpp:476
Computation spaces.
Definition: core.hpp:1701
ExecStatus prune(Space &home, ViewArray< VX > &x, ConstIntView)
Definition: rel.hpp:264
Base-class for both propagators and branchers.
Definition: core.hpp:627
#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
Propagator for counting views (equal integer to number of equal views)
Definition: count.hh:172
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-eq.hpp:44
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
ModEventDelta modeventdelta(void) const
Return the modification event delta.
Definition: core.hpp:3447
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
ExecStatus
Definition: core.hpp:471
EqView(Space &home, EqView &p)
Constructor for cloning p.
Definition: view-eq.hpp:59
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
int atmost(void) const
How many views are at most equal.
Definition: view-base.hpp:112
Gecode toplevel namespace
ExecStatus post_false(Home home, VX x, ConstIntView y)
Definition: rel.hpp:194
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1138
Home class for posting propagators
Definition: core.hpp:853
const Gecode::ModEvent ME_INT_NONE
Domain operation has not changed domain.
Definition: var-type.hpp:54
ExecStatus post_true(Home home, VX x, ConstIntView y)
Definition: rel.hpp:151