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subset.hpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Guido Tack <tack@gecode.org>
5  * Christian Schulte <schulte@gecode.org>
6  *
7  * Contributing authors:
8  * Gabor Szokoli <szokoli@gecode.org>
9  *
10  * Copyright:
11  * Guido Tack, 2004
12  * Christian Schulte, 2004
13  * Gabor Szokoli, 2004
14  *
15  * This file is part of Gecode, the generic constraint
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17  * http://www.gecode.org
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39 
40 namespace Gecode { namespace Set { namespace Rel {
41 
42  template<class View0, class View1>
44  Subset<View0,View1>::Subset(Home home, View0 y0, View1 y1)
46  View1,PC_SET_CLUB>(home,y0,y1) {}
47 
48  template<class View0, class View1>
52  View1,PC_SET_CLUB>(home,p) {}
53 
54  template<class View0, class View1>
56  if (!same(x,y))
57  (void) new (home) Subset(home,x,y);
58  return ES_OK;
59  }
60 
61  template<class View0, class View1>
62  Actor*
64  return new (home) Subset(home,*this);
65  }
66 
67  template<class View0, class View1>
70  bool oneassigned = x0.assigned() || x1.assigned();
71  unsigned int x0glbsize;
72  do {
73  GlbRanges<View0> x0lb(x0);
74  GECODE_ME_CHECK ( x1.includeI(home,x0lb) );
75  GECODE_ME_CHECK ( x1.cardMin(home,x0.cardMin()) );
76  LubRanges<View1> x1ub(x1);
77  x0glbsize = x0.glbSize();
78  GECODE_ME_CHECK ( x0.intersectI(home,x1ub) );
79  GECODE_ME_CHECK ( x0.cardMax(home,x1.cardMax()) );
80  } while (x0.glbSize() > x0glbsize);
81 
82  if (x0.cardMin() == x1.cardMax())
83  GECODE_REWRITE(*this,(Eq<View0,View1>::post(home(*this),x0,x1)));
84 
85  if (shared(x0,x1)) {
86  return oneassigned ? home.ES_SUBSUMED(*this) : ES_NOFIX;
87  }
88  return (x0.assigned() || x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_FIX;
89  }
90 
91 }}}
92 
93 // STATISTICS: set-prop
const Gecode::PropCond PC_SET_CLUB
Propagate when the cardinality or the least upper bound of a view changes.
Definition: var-type.hpp:227
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition: macros.hpp:116
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3490
Propagator for the subset constraint
Definition: rel.hh:64
Subset(Space &home, Subset &p)
Constructor for cloning p.
Definition: subset.hpp:50
Range iterator for the greatest lower bound.
Definition: var-imp.hpp:359
#define forceinline
Definition: config.hpp:185
Propagation has computed fixpoint.
Definition: core.hpp:476
Computation spaces.
Definition: core.hpp:1701
Range iterator for the least upper bound.
Definition: var-imp.hpp:317
Base-class for both propagators and branchers.
Definition: core.hpp:627
static ExecStatus post(Home home, View0 x, View1 y)
Post propagator .
Definition: subset.hpp:55
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: subset.hpp:69
bool same(VX, VY)
Test whether two views are in fact the same.
Definition: common.hpp:57
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:52
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition: subset.hpp:63
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
Mixed binary propagator.
Definition: pattern.hpp:204
ExecStatus
Definition: core.hpp:471
const Gecode::PropCond PC_SET_CGLB
Propagate when the cardinality or the greatest lower bound of a view changes.
Definition: var-type.hpp:238
Propagator for set equality
Definition: rel.hh:150
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
Gecode toplevel namespace
bool shared(ViewArray< ViewX > x, ViewArray< ViewY > y)
Definition: array.hpp:1428
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
Home class for posting propagators
Definition: core.hpp:853