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view-eq.hpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2003
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10  * $Date: 2016-04-19 17:19:45 +0200 (Tue, 19 Apr 2016) $ 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, bool dom>
43  ViewArray<VX>& x, 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, bool dom>
49  ViewArray<VX>& x, VY y, VZ z, int c) {
50  GECODE_ME_CHECK(z.gq(home,-c));
51  GECODE_ME_CHECK(z.lq(home,x.size()-c));
52  if (isval(y) && z.assigned())
53  return EqInt<VX,VY>::post(home,x,y,z.val()+c);
54  if (sharing(x,y,z))
55  (void) new (home) EqView<VX,VY,VZ,true,dom>(home,x,y,z,c);
56  else
57  (void) new (home) EqView<VX,VY,VZ,false,dom>(home,x,y,z,c);
58  return ES_OK;
59  }
60 
61  template<class VX, class VY, class VZ, bool shr, bool dom>
65  : ViewBase<VX,VY,VZ>(home,share,p) {}
66 
67  template<class VX, class VY, class VZ, bool shr, bool dom>
68  Actor*
70  return new (home) EqView<VX,VY,VZ,shr,dom>(home,share,*this);
71  }
72 
73  template<class VX, class VY, class VZ, bool shr, bool dom>
76  count(home);
77 
78  GECODE_ME_CHECK(z.gq(home,atleast()));
79  GECODE_ME_CHECK(z.lq(home,atmost()));
80 
81  if (z.assigned()) {
82  if (z.val() == atleast()) {
84  return home.ES_SUBSUMED(*this);
85  }
86  if (z.val() == atmost()) {
88  return home.ES_SUBSUMED(*this);
89  }
90  if (!dom || isval(y)) {
91  VY yc(y);
93  ::post(home(*this),x,yc,z.val()+c)));
94  }
95  }
96 
97 
98  if (dom && !isval(y) && (z.min() > 0)) {
99  /*
100  * Only if the propagator is at fixpoint here, continue
101  * when things are shared: the reason is that prune
102  * requires that the views in x overlap with y!
103  */
104  if (shr && (VX::me(Propagator::modeventdelta()) != ME_INT_NONE))
105  return ES_NOFIX;
106 
107  GECODE_ES_CHECK(prune(home,x,y));
108 
109  return ES_NOFIX;
110  }
111 
112  return shr ? ES_NOFIX : ES_FIX;
113  }
114 
115 }}}
116 
117 // 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
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: view-eq.hpp:75
virtual Actor * copy(Space &home, bool share)
Create copy during cloning.
Definition: view-eq.hpp:69
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
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
Propagator for counting views (equal to number of equal views)
Definition: count.hh:310
Propagation has computed fixpoint.
Definition: core.hpp:545
Computation spaces.
Definition: core.hpp:1748
ExecStatus prune(Space &home, ViewArray< VX > &x, ConstIntView)
Definition: rel.hpp:257
Base-class for both propagators and branchers.
Definition: core.hpp:696
#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)
EqView(Space &home, bool share, EqView &p)
Constructor for cloning p.
Definition: view-eq.hpp:63
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
VY y
View to compare to.
Definition: count.hh:272
Propagator for counting views (equal integer to number of equal views)
Definition: count.hh:173
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-eq.hpp:48
Post propagator for SetVar SetOpType SetVar SetRelType SetVar z
Definition: set.hh:784
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:56
ModEventDelta modeventdelta(void) const
Return the modification event delta.
Definition: core.hpp:3583
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
int atmost(void) const
How many views are at most equal.
Definition: view-base.hpp:116
Gecode toplevel namespace
ExecStatus post_false(Home home, VX x, ConstIntView y)
Definition: rel.hpp:187
int ModEventDelta
Modification event deltas.
Definition: core.hpp:169
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1215
Home class for posting propagators
Definition: core.hpp:922
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:144