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re-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  * Copyright:
8  * Guido Tack, 2004
9  * Christian Schulte, 2004
10  *
11  * Last modified:
12  * $Date: 2010-03-04 03:32:21 +1100 (Thu, 04 Mar 2010) $ by $Author: schulte $
13  * $Revision: 10364 $
14  *
15  * This file is part of Gecode, the generic constraint
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39 
40 namespace Gecode { namespace Set { namespace Rel {
41 
42  template<class View0, class View1>
45  View1 y1, Gecode::Int::BoolView y2)
46  : Propagator(home), x0(y0), x1(y1), b(y2) {
47  b.subscribe(home,*this, Gecode::Int::PC_INT_VAL);
48  x0.subscribe(home,*this, PC_SET_ANY);
49  x1.subscribe(home,*this, PC_SET_ANY);
50  }
51 
52  template<class View0, class View1>
55  : Propagator(home,share,p) {
56  x0.update(home,share,p.x0);
57  x1.update(home,share,p.x1);
58  b.update(home,share,p.b);
59  }
60 
61  template<class View0, class View1>
62  PropCost
65  }
66 
67  template<class View0, class View1>
68  forceinline size_t
70  b.cancel(home,*this, Gecode::Int::PC_INT_VAL);
71  x0.cancel(home,*this, PC_SET_ANY);
72  x1.cancel(home,*this, PC_SET_ANY);
73  (void) Propagator::dispose(home);
74  return sizeof(*this);
75  }
76 
77  template<class View0, class View1>
79  ReSubset<View0,View1>::post(Home home, View0 x0, View1 x1,
81  (void) new (home) ReSubset<View0,View1>(home,x0,x1,b);
82  return ES_OK;
83  }
84 
85  template<class View0, class View1>
86  Actor*
87  ReSubset<View0,View1>::copy(Space& home, bool share) {
88  return new (home) ReSubset<View0,View1>(home,share,*this);
89  }
90 
91  template<class View0, class View1>
94  if (b.one())
95  GECODE_REWRITE(*this,(Subset<View0,View1>::post(home(*this),x0,x1)));
96  if (b.zero())
97  GECODE_REWRITE(*this,(NoSubset<View0,View1>::post(home(*this),x0,x1)));
98 
99  // check whether cardinalities still allow subset
100  if (x0.cardMin() > x1.cardMax()) {
101  GECODE_ME_CHECK(b.zero_none(home));
102  return home.ES_SUBSUMED(*this);
103  }
104 
105  // check lub(x0) subset glb(x1)
106  {
107  LubRanges<View0> x0ub(x0);
108  GlbRanges<View1> x1lb(x1);
110  if (!d()) {
111  GECODE_ME_CHECK(b.one_none(home));
112  return home.ES_SUBSUMED(*this);
113  }
114  }
115 
116  // check glb(x0) subset lub(x1)
117  {
118  GlbRanges<View0> x0lb(x0);
119  LubRanges<View1> x1ub(x1);
121  if (d()) {
122  GECODE_ME_CHECK(b.zero_none(home));
123  return home.ES_SUBSUMED(*this);
124  } else if (x0.assigned() && x1.assigned()) {
125  GECODE_ME_CHECK(b.one_none(home));
126  return home.ES_SUBSUMED(*this);
127  }
128  }
129 
130  if (x0.cardMin() > 0) {
131  LubRanges<View0> x0ub(x0);
132  LubRanges<View1> x1ub(x1);
134  i(x0ub,x1ub);
135  if (!i()) {
136  GECODE_ME_CHECK(b.zero_none(home));
137  return home.ES_SUBSUMED(*this);
138  }
139  }
140 
141  return ES_FIX;
142  }
143 
144 }}}
145 
146 // STATISTICS: set-prop