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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  * Last modified:
16  * $Date: 2010-03-03 17:32:21 +0100 (Wed, 03 Mar 2010) $ by $Author: schulte $
17  * $Revision: 10364 $
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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,share,p) {}
57 
58  template<class View0, class View1>
59  ExecStatus Subset<View0,View1>::post(Home home, View0 x, View1 y) {
60  (void) new (home) Subset(home,x,y);
61  return ES_OK;
62  }
63 
64  template<class View0, class View1>
65  Actor*
66  Subset<View0,View1>::copy(Space& home, bool share) {
67  return new (home) Subset(home,share,*this);
68  }
69 
70  template<class View0, class View1>
73  bool oneassigned = x0.assigned() || x1.assigned();
74  unsigned int x0glbsize;
75  do {
76  GlbRanges<View0> x0lb(x0);
77  GECODE_ME_CHECK ( x1.includeI(home,x0lb) );
78  GECODE_ME_CHECK ( x1.cardMin(home,x0.cardMin()) );
79  LubRanges<View1> x1ub(x1);
80  x0glbsize = x0.glbSize();
81  GECODE_ME_CHECK ( x0.intersectI(home,x1ub) );
82  GECODE_ME_CHECK ( x0.cardMax(home,x1.cardMax()) );
83  } while (x0.glbSize() > x0glbsize);
84 
85  if (x0.cardMin() == x1.cardMax())
86  GECODE_REWRITE(*this,(Eq<View0,View1>::post(home(*this),x0,x1)));
87 
88  if (shared(x0,x1)) {
89  return oneassigned ? home.ES_SUBSUMED(*this) : ES_NOFIX;
90  }
91  return (x0.assigned() || x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_FIX;
92  }
93 
94 }}}
95 
96 // 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:109
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:2973
Propagator for the subset constraint
Definition: rel.hh:64
Range iterator for the greatest lower bound.
Definition: var-imp.hpp:363
Propagation has computed fixpoint.
Definition: core.hpp:528
Computation spaces.
Definition: core.hpp:1362
Range iterator for the least upper bound.
Definition: var-imp.hpp:321
Base-class for both propagators and branchers.
Definition: core.hpp:666
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:72
#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
Mixed binary propagator.
Definition: propagator.hpp:203
ExecStatus
Definition: core.hpp:523
const Gecode::PropCond PC_SET_CGLB
Propagate when the cardinality or the greatest lower bound of a view changes.
Definition: var-type.hpp:238
#define forceinline
Definition: config.hpp:132
Propagator for set equality
Definition: rel.hh:146
Subset(Space &home, bool share, Subset &p)
Constructor for cloning p.
Definition: subset.hpp:54
Execution is okay.
Definition: core.hpp:527
Propagation has not computed fixpoint.
Definition: core.hpp:526
bool shared(const ConstView< ViewA > &, const ConstView< ViewB > &)
Test whether views share same variable.
Definition: view.hpp:662
Gecode toplevel namespace
int ModEventDelta
Modification event deltas.
Definition: core.hpp:173
Home class for posting propagators
Definition: core.hpp:717
virtual Actor * copy(Space &home, bool)
Copy propagator during cloning.
Definition: subset.hpp:66