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nosubset.hpp
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2 /*
3  * Main authors:
4  * Guido Tack <tack@gecode.org>
5  * Christian Schulte <schulte@gecode.org>
6  * Gabor Szokoli <szokoli@gecode.org>
7  *
8  * Copyright:
9  * Guido Tack, 2004
10  * Christian Schulte, 2004
11  * Gabor Szokoli, 2004
12  *
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37 
38 namespace Gecode { namespace Set { namespace Rel {
39 
40  /*
41  * "No Subset" propagator
42  *
43  */
44 
45  template<class View0, class View1>
47  NoSubset<View0,View1>::NoSubset(Home home, View0 y0, View1 y1)
49  View1,PC_SET_CGLB>(home,y0,y1) {}
50 
51  template<class View0, class View1>
55  View1,PC_SET_CGLB>(home,p) {}
56 
57  template<class View0, class View1>
59  NoSubset<View0,View1>::post(Home home, View0 x, View1 y) {
60  if (same(x,y))
61  return ES_FAILED;
62  if (me_failed(x.cardMin(home,1)))
63  return ES_FAILED;
64  (void) new (home) NoSubset<View0,View1>(home,x,y);
65  return ES_OK;
66  }
67 
68  template<class View0, class View1>
69  Actor*
71  return new (home) NoSubset<View0,View1>(home,*this);
72  }
73 
74  template<class View0, class View1>
77  GlbRanges<View0> x0lb(x0);
78  LubRanges<View1> x1ub(x1);
79  if (!Iter::Ranges::subset(x0lb, x1ub))
80  return home.ES_SUBSUMED(*this);
81  if (x0.cardMin()>x1.cardMax()) { return home.ES_SUBSUMED(*this); }
82  LubRanges<View0> x0ub(x0);
83  GlbRanges<View1> x1lb(x1);
85  breakers(x0ub,x1lb);
86  if (!breakers()) { return ES_FAILED; }
87  if (breakers.min() == breakers.max()) {
88  int b1 = breakers.min();
89  ++breakers;
90  if (breakers()) { return ES_FIX; }
91  //Only one subsetness-breaker element left:
92  GECODE_ME_CHECK( x0.include(home,b1) );
93  GECODE_ME_CHECK( x1.exclude(home,b1) );
94  return home.ES_SUBSUMED(*this);
95  }
96  return ES_FIX;
97  }
98 
99 }}}
100 
101 // 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:3482
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition: nosubset.hpp:70
int max(void) const
Return largest value of range.
NoSubset(Space &home, NoSubset &p)
Constructor for cloning p.
Definition: nosubset.hpp:53
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: nosubset.hpp:59
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
Execution has resulted in failure.
Definition: core.hpp:473
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
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:765
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
Post propagator for SetVar x
Definition: set.hh:765
Execution is okay.
Definition: core.hpp:475
Propagator for the negated subset constraint
Definition: rel.hh:90
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:76
Gecode toplevel namespace
Range iterator for computing set difference.
Definition: ranges-diff.hpp:43
int min(void) const
Return smallest value of range.
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
Home class for posting propagators
Definition: core.hpp:853
bool me_failed(ModEvent me)
Check whether modification event me is failed.
Definition: modevent.hpp:54