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bool-lq.hpp
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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
static ExecStatus post(Home home, ViewArray< BV > &x)
Post propagator .
Definition: eq.hpp:135
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:2973
bool one(const Gecode::FloatValArgs &a)
Check whether has only one coefficients.
Definition: linear.cpp:50
Less or equal to number of values propagator for Boolean views.
Definition: nvalues.hh:363
virtual Actor * copy(Space &home, bool share)
Copy propagator during cloning.
Definition: bool-lq.hpp:54
LqBool(Home home, int status, ViewArray< BoolView > &x, VY y)
Constructor for posting.
Definition: bool-lq.hpp:44
Class to iterate over advisors of a council.
Definition: core.hpp:227
Propagation has computed fixpoint.
Definition: core.hpp:528
void unique(const Space &home)
Remove all duplicate views from array (changes element order)
Definition: array.hpp:1498
Computation spaces.
Definition: core.hpp:1362
Advisor storing a single view
Definition: advisor.hpp:47
Base-class for both propagators and branchers.
Definition: core.hpp:666
Gecode::FloatVal c(-8, 8)
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
Gecode::IntArgs i(4, 1, 2, 3, 4)
int n
Number of negative literals for node type.
Definition: bool-expr.cpp:238
Number of values propagator for Boolean views base class.
Definition: nvalues.hh:299
static ExecStatus post(Home home, ViewArray< BoolView > &x, VY y)
Post propagator for .
Definition: bool-lq.hpp:60
#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
ExecStatus
Definition: core.hpp:523
#define forceinline
Definition: config.hpp:132
Execution is okay.
Definition: core.hpp:527
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1215
Gecode toplevel namespace
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: bool-lq.hpp:115
int ModEventDelta
Modification event deltas.
Definition: core.hpp:173
Home class for posting propagators
Definition: core.hpp:717