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nosubset.hpp
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3  * Main authors:
4  * Guido Tack <tack@gecode.org>
5  * Christian Schulte <schulte@gecode.org>
6  * Gabor Szokoli <szokoli@gecode.org>
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8  * Copyright:
9  * Guido Tack, 2004
10  * Christian Schulte, 2004
11  * Gabor Szokoli, 2004
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41 
42 namespace Gecode { namespace Set { namespace Rel {
43 
44  /*
45  * "No Subset" propagator
46  *
47  */
48 
49  template<class View0, class View1>
51  NoSubset<View0,View1>::NoSubset(Home home, View0 y0, View1 y1)
53  View1,PC_SET_CGLB>(home,y0,y1) {}
54 
55  template<class View0, class View1>
59  View1,PC_SET_CGLB>(home,p) {}
60 
61  template<class View0, class View1>
63  NoSubset<View0,View1>::post(Home home, View0 x, View1 y) {
64  if (same(x,y))
65  return ES_FAILED;
66  if (me_failed(x.cardMin(home,1)))
67  return ES_FAILED;
68  (void) new (home) NoSubset<View0,View1>(home,x,y);
69  return ES_OK;
70  }
71 
72  template<class View0, class View1>
73  Actor*
75  return new (home) NoSubset<View0,View1>(home,*this);
76  }
77 
78  template<class View0, class View1>
81  GlbRanges<View0> x0lb(x0);
82  LubRanges<View1> x1ub(x1);
83  if (!Iter::Ranges::subset(x0lb, x1ub))
84  return home.ES_SUBSUMED(*this);
85  if (x0.cardMin()>x1.cardMax()) { return home.ES_SUBSUMED(*this); }
86  LubRanges<View0> x0ub(x0);
87  GlbRanges<View1> x1lb(x1);
89  breakers(x0ub,x1lb);
90  if (!breakers()) { return ES_FAILED; }
91  if (breakers.min() == breakers.max()) {
92  int b1 = breakers.min();
93  ++breakers;
94  if (breakers()) { return ES_FIX; }
95  //Only one subsetness-breaker element left:
96  GECODE_ME_CHECK( x0.include(home,b1) );
97  GECODE_ME_CHECK( x1.exclude(home,b1) );
98  return home.ES_SUBSUMED(*this);
99  }
100  return ES_FIX;
101  }
102 
103 }}}
104 
105 // 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
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3433
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition: nosubset.hpp:74
int max(void) const
Return largest value of range.
NoSubset(Space &home, NoSubset &p)
Constructor for cloning p.
Definition: nosubset.hpp:57
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: nosubset.hpp:63
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
Execution has resulted in failure.
Definition: core.hpp:466
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
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
Post propagator for SetVar x
Definition: set.hh:769
Execution is okay.
Definition: core.hpp:468
Propagator for the negated subset constraint
Definition: rel.hh:94
bool subset(I &i, J &j)
Check whether range iterator i is subset of range iterator j.
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: nosubset.hpp:80
Gecode toplevel namespace
Range iterator for computing set difference.
Definition: ranges-diff.hpp:47
int min(void) const
Return smallest value of range.
int ModEventDelta
Modification event deltas.
Definition: core.hpp:91
Home class for posting propagators
Definition: core.hpp:846
bool me_failed(ModEvent me)
Check whether modification event me is failed.
Definition: modevent.hpp:58