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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>
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7  * Contributing authors:
8  * Gabor Szokoli <szokoli@gecode.org>
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10  * Copyright:
11  * Guido Tack, 2004
12  * Christian Schulte, 2004
13  * Gabor Szokoli, 2004
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43 
44 namespace Gecode { namespace Set { namespace Rel {
45 
46  template<class View0, class View1>
48  Subset<View0,View1>::Subset(Home home, View0 y0, View1 y1)
50  View1,PC_SET_CLUB>(home,y0,y1) {}
51 
52  template<class View0, class View1>
56  View1,PC_SET_CLUB>(home,p) {}
57 
58  template<class View0, class View1>
60  if (!same(x,y))
61  (void) new (home) Subset(home,x,y);
62  return ES_OK;
63  }
64 
65  template<class View0, class View1>
66  Actor*
68  return new (home) Subset(home,*this);
69  }
70 
71  template<class View0, class View1>
74  bool oneassigned = x0.assigned() || x1.assigned();
75  unsigned int x0glbsize;
76  do {
77  GlbRanges<View0> x0lb(x0);
78  GECODE_ME_CHECK ( x1.includeI(home,x0lb) );
79  GECODE_ME_CHECK ( x1.cardMin(home,x0.cardMin()) );
80  LubRanges<View1> x1ub(x1);
81  x0glbsize = x0.glbSize();
82  GECODE_ME_CHECK ( x0.intersectI(home,x1ub) );
83  GECODE_ME_CHECK ( x0.cardMax(home,x1.cardMax()) );
84  } while (x0.glbSize() > x0glbsize);
85 
86  if (x0.cardMin() == x1.cardMax())
87  GECODE_REWRITE(*this,(Eq<View0,View1>::post(home(*this),x0,x1)));
88 
89  if (shared(x0,x1)) {
90  return oneassigned ? home.ES_SUBSUMED(*this) : ES_NOFIX;
91  }
92  return (x0.assigned() || x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_FIX;
93  }
94 
95 }}}
96 
97 // 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:120
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3433
Propagator for the subset constraint
Definition: rel.hh:68
Subset(Space &home, Subset &p)
Constructor for cloning p.
Definition: subset.hpp:54
Range iterator for the greatest lower bound.
Definition: var-imp.hpp:363
#define forceinline
Definition: config.hpp:182
Propagation has computed fixpoint.
Definition: core.hpp:469
Computation spaces.
Definition: core.hpp:1668
Range iterator for the least upper bound.
Definition: var-imp.hpp:321
Base-class for both propagators and branchers.
Definition: core.hpp:620
static ExecStatus post(Home home, View0 x, View1 y)
Post propagator .
Definition: subset.hpp:59
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: subset.hpp:73
bool same(VX, VY)
Test whether two views are in fact the same.
Definition: common.hpp:61
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:56
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition: subset.hpp:67
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:769
Mixed binary propagator.
Definition: pattern.hpp:208
ExecStatus
Definition: core.hpp:464
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:154
Post propagator for SetVar x
Definition: set.hh:769
Execution is okay.
Definition: core.hpp:468
Propagation has not computed fixpoint.
Definition: core.hpp:467
bool shared(const ConstView< ViewA > &, const ConstView< ViewB > &)
Test whether views share same variable.
Definition: view.hpp:702
Gecode toplevel namespace
int ModEventDelta
Modification event deltas.
Definition: core.hpp:91
Home class for posting propagators
Definition: core.hpp:846