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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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9  * Last modified:
10  * $Date: 2011-09-20 13:58:39 +0200 (Tue, 20 Sep 2011) $ by $Author: schulte $
11  * $Revision: 12404 $
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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 ((vtd(y) != VTD_VARVIEW) && 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()) {
83  GECODE_ES_CHECK(post_false(home,x,y));
84  return home.ES_SUBSUMED(*this);
85  }
86  if (z.val() == atmost()) {
87  GECODE_ES_CHECK(post_true(home,x,y));
88  return home.ES_SUBSUMED(*this);
89  }
90  if (!dom || (vtd(y) != VTD_VARVIEW)) {
91  VY yc(y);
93  ::post(home(*this),x,yc,z.val()+c)));
94  }
95  }
96 
97 
98  if (dom && (vtd(y) == VTD_VARVIEW) && (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:109
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
void post(Home home, Term *t, int n, FloatRelType frt, FloatVal c)
Post propagator for linear constraint over floats.
Definition: post.cpp:228
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:2973
Base-class for count propagators (view)
Definition: count.hh:265
void atmost(Home home, const IntVarArgs &x, int n, int m, IntConLevel icl=ICL_DEF)
Post constraint .
Definition: minimodel.hh:1675
void dom(Home home, FloatVar x, FloatVal n)
Propagates .
Definition: dom.cpp:44
Propagator for counting views (equal to number of equal views)
Definition: count.hh:306
Propagation has computed fixpoint.
Definition: core.hpp:528
Computation spaces.
Definition: core.hpp:1362
ExecStatus prune(Space &home, ViewArray< VX > &x, ConstIntView)
Definition: rel.hpp:245
void atleast(Home home, const IntVarArgs &x, int n, int m, IntConLevel icl=ICL_DEF)
Post constraint .
Definition: minimodel.hh:1736
Base-class for both propagators and branchers.
Definition: core.hpp:666
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:84
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
Propagator for counting views (equal integer to number of equal views)
Definition: count.hh:171
ViewTypeDesc vtd(VY y)
Return the view type description of y.
Definition: rel.hpp:49
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, VZ z, int c)
Post propagator for .
Definition: view-eq.hpp:48
ModEventDelta modeventdelta(void) const
Return the modification event delta.
Definition: core.hpp:2957
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:45
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:253
void count(Home home, const IntVarArgs &x, int n, IntRelType irt, int m, IntConLevel)
Post propagator for .
Definition: count.cpp:44
ExecStatus
Definition: core.hpp:523
#define forceinline
Definition: config.hpp:132
Execution is okay.
Definition: core.hpp:527
Propagation has not computed fixpoint.
Definition: core.hpp:526
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1215
Gecode toplevel namespace
ExecStatus post_false(Home home, VX x, ConstIntView y)
Definition: rel.hpp:175
int ModEventDelta
Modification event deltas.
Definition: core.hpp:173
Home class for posting propagators
Definition: core.hpp:717
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:132