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bool-gq.hpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
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6  * Copyright:
7  * Christian Schulte, 2011
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10  * $Date: 2011-08-13 22:25:20 +1000 (Sat, 13 Aug 2011) $ by $Author: schulte $
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37 
38 #include <gecode/int/rel.hh>
39 
40 namespace Gecode { namespace Int { namespace NValues {
41 
42  template<class VY>
44  GqBool<VY>::GqBool(Home home, int status, ViewArray<BoolView>& x, VY y)
45  : BoolBase<VY>(home,status,x,y) {}
46 
47  template<class VY>
49  GqBool<VY>::GqBool(Space& home, bool share, GqBool<VY>& p)
50  : BoolBase<VY>(home,share,p) {}
51 
52  template<class VY>
53  Actor*
54  GqBool<VY>::copy(Space& home, bool share) {
55  return new (home) GqBool<VY>(home,share,*this);
56  }
57 
58  template<class VY>
59  inline ExecStatus
61  if (x.size() == 0) {
62  GECODE_ME_CHECK(y.lq(home,0));
63  return ES_OK;
64  }
65 
66  x.unique(home);
67 
68  if (x.size() == 1) {
69  GECODE_ME_CHECK(y.lq(home,1));
70  return ES_OK;
71  }
72 
73  GECODE_ME_CHECK(y.lq(home,2));
74 
75  if (y.max() <= 1)
76  return ES_OK;
77 
78  if (y.min() == 2) {
79  assert(y.assigned());
80  ViewArray<BoolView> xc(home,x);
81  return Rel::NaryNq<BoolView>::post(home,xc);
82  }
83 
84  int n = x.size();
85  int status = 0;
86  for (int i=n; i--; )
87  if (x[i].zero()) {
88  if (status & VS_ONE)
89  return ES_OK;
90  x[i] = x[--n];
91  status |= VS_ZERO;
92  } else if (x[i].one()) {
93  if (status & VS_ZERO)
94  return ES_OK;
95  x[i] = x[--n];
96  status |= VS_ONE;
97  }
98 
99  assert(status != (VS_ZERO | VS_ONE));
100  if (n == 0) {
101  assert(status != 0);
102  GECODE_ME_CHECK(y.lq(home,1));
103  return ES_OK;
104  }
105  x.size(n);
106 
107  (void) new (home) GqBool<VY>(home,status,x,y);
108  return ES_OK;
109  }
110 
111  template<class VY>
112  ExecStatus
114  if (status == (VS_ZERO | VS_ONE))
115  return home.ES_SUBSUMED(*this);
116 
117  if (c.empty()) {
118  assert(status != 0);
119  GECODE_ME_CHECK(y.lq(home,1));
120  return home.ES_SUBSUMED(*this);
121  }
122 
123  if (y.max() <= 1)
124  return home.ES_SUBSUMED(*this);
125 
126  if (y.min() == 2) {
128  assert(as());
130  ++as;
131  if (!as()) {
132  // Only a single view is left
133  if (status == VS_ZERO) {
134  GECODE_ME_CHECK(a.view().one(home));
135  } else if (status == VS_ONE) {
136  GECODE_ME_CHECK(a.view().zero(home));
137  } else {
138  return ES_FAILED;
139  }
140  return home.ES_SUBSUMED(*this);
141  }
142  }
143 
144  return ES_FIX;
145  }
146 
147 }}}
148 
149 // STATISTICS: int-prop