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nosubset.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  * Gabor Szokoli <szokoli@gecode.org>
7  *
8  * Copyright:
9  * Guido Tack, 2004
10  * Christian Schulte, 2004
11  * Gabor Szokoli, 2004
12  *
13  * Last modified:
14  * $Date: 2010-03-04 03:32:21 +1100 (Thu, 04 Mar 2010) $ by $Author: schulte $
15  * $Revision: 10364 $
16  *
17  * This file is part of Gecode, the generic constraint
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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>
60  View1,PC_SET_CGLB>(home,share,p) {}
61 
62  template<class View0, class View1>
64  NoSubset<View0,View1>::post(Home home, View0 x, View1 y) {
65  if (me_failed(x.cardMin(home,1)))
66  return ES_FAILED;
67  (void) new (home) NoSubset<View0,View1>(home,x,y);
68  return ES_OK;
69  }
70 
71  template<class View0, class View1>
72  Actor*
73  NoSubset<View0,View1>::copy(Space& home, bool share) {
74  return new (home) NoSubset<View0,View1>(home,share,*this);
75  }
76 
77  template<class View0, class View1>
80  GlbRanges<View0> x0lb(x0);
81  LubRanges<View1> x1ub(x1);
82  if (!Iter::Ranges::subset(x0lb, x1ub))
83  return home.ES_SUBSUMED(*this);
84  if (x0.cardMin()>x1.cardMax()) { return home.ES_SUBSUMED(*this); }
85  LubRanges<View0> x0ub(x0);
86  GlbRanges<View1> x1lb(x1);
88  breakers(x0ub,x1lb);
89  if (!breakers()) { return ES_FAILED; }
90  if (breakers.min() == breakers.max()) {
91  int b1 = breakers.min();
92  ++breakers;
93  if (breakers()) { return ES_FIX; }
94  //Only one subsetness-breaker element left:
95  GECODE_ME_CHECK( x0.include(home,b1) );
96  GECODE_ME_CHECK( x1.exclude(home,b1) );
97  return home.ES_SUBSUMED(*this);
98  }
99  return ES_FIX;
100  }
101 
102 }}}
103 
104 // STATISTICS: set-prop