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bool-lq.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>
5  *
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/bool.hh>
39 
40 namespace Gecode { namespace Int { namespace NValues {
41 
42  template<class VY>
44  LqBool<VY>::LqBool(Home home, int status, ViewArray<BoolView>& x, VY y)
45  : BoolBase<VY>(home,status,x,y) {}
46 
47  template<class VY>
49  LqBool<VY>::LqBool(Space& home, bool share, LqBool<VY>& p)
50  : BoolBase<VY>(home,share,p) {}
51 
52  template<class VY>
53  Actor*
54  LqBool<VY>::copy(Space& home, bool share) {
55  return new (home) LqBool<VY>(home,share,*this);
56  }
57 
58  template<class VY>
59  inline ExecStatus
61  if (x.size() == 0) {
62  GECODE_ME_CHECK(y.gq(home,0));
63  return ES_OK;
64  }
65 
66  x.unique(home);
67 
68  GECODE_ME_CHECK(y.gq(home,1));
69 
70  if (x.size() == 1)
71  return ES_OK;
72 
73  if (y.max() == 1) {
74  assert(y.assigned());
75  ViewArray<BoolView> xc(home,x);
76  return Bool::NaryEq<BoolView>::post(home,xc);
77  }
78 
79  if (y.min() >= 2)
80  return ES_OK;
81 
82  int n = x.size();
83  int status = 0;
84  for (int i=n; i--; )
85  if (x[i].zero()) {
86  if (status & VS_ONE) {
87  GECODE_ME_CHECK(y.gq(home,2));
88  return ES_OK;
89  }
90  x[i] = x[--n];
91  status |= VS_ZERO;
92  } else if (x[i].one()) {
93  if (status & VS_ZERO) {
94  GECODE_ME_CHECK(y.gq(home,2));
95  return ES_OK;
96  }
97  x[i] = x[--n];
98  status |= VS_ONE;
99  }
100 
101  assert(status != (VS_ZERO | VS_ONE));
102  if (n == 0) {
103  assert((status != 0) && (y.min() >= 1));
104  return ES_OK;
105  }
106 
107  x.size(n);
108 
109  (void) new (home) LqBool<VY>(home,status,x,y);
110  return ES_OK;
111  }
112 
113  template<class VY>
114  ExecStatus
116  if (status == (VS_ZERO | VS_ONE)) {
117  GECODE_ME_CHECK(y.gq(home,2));
118  return home.ES_SUBSUMED(*this);
119  }
120 
121  if (c.empty()) {
122  assert((status != 0) && (y.min() >= 1));
123  return home.ES_SUBSUMED(*this);
124  }
125 
126  if (y.max() == 1) {
127  if (status == VS_ZERO) {
128  // Mark that everything is done
129  status = VS_ZERO | VS_ONE;
130  for (Advisors<ViewAdvisor<BoolView> > as(c); as(); ++as)
131  GECODE_ME_CHECK(as.advisor().view().zero(home));
132  return home.ES_SUBSUMED(*this);
133  }
134  if (status == VS_ONE) {
135  // Mark that everything is done
136  status = VS_ZERO | VS_ONE;
137  for (Advisors<ViewAdvisor<BoolView> > as(c); as(); ++as)
138  GECODE_ME_CHECK(as.advisor().view().one(home));
139  return home.ES_SUBSUMED(*this);
140  }
141  }
142 
143  if (y.min() == 2)
144  return home.ES_SUBSUMED(*this);
145 
146  return ES_FIX;
147  }
148 
149 }}}
150 
151 // STATISTICS: int-prop