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bool-eq.hpp
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33 
34 #include <gecode/int/rel.hh>
35 #include <gecode/int/bool.hh>
36 
37 namespace Gecode { namespace Int { namespace NValues {
38 
39  template<class VY>
41  EqBool<VY>::EqBool(Home home, int status, ViewArray<BoolView>& x, VY y)
42  : BoolBase<VY>(home,status,x,y) {}
43 
44  template<class VY>
47  : BoolBase<VY>(home,p) {}
48 
49  template<class VY>
50  Actor*
52  return new (home) EqBool<VY>(home,*this);
53  }
54 
55  template<class VY>
56  inline ExecStatus
58  if (x.size() == 0) {
59  GECODE_ME_CHECK(y.eq(home,0));
60  return ES_OK;
61  }
62 
63  x.unique();
64 
65  if (x.size() == 1) {
66  GECODE_ME_CHECK(y.eq(home,1));
67  return ES_OK;
68  }
69 
70  GECODE_ME_CHECK(y.gq(home,1));
71  GECODE_ME_CHECK(y.lq(home,2));
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  assert(y.assigned());
81  ViewArray<BoolView> xc(home,x);
82  return Rel::NaryNq<BoolView>::post(home,xc);
83  }
84 
85  int n = x.size();
86  int status = 0;
87  for (int i=n; i--; )
88  if (x[i].zero()) {
89  if (status & VS_ONE) {
90  GECODE_ME_CHECK(y.eq(home,2));
91  return ES_OK;
92  }
93  x[i] = x[--n];
94  status |= VS_ZERO;
95  } else if (x[i].one()) {
96  if (status & VS_ZERO) {
97  GECODE_ME_CHECK(y.eq(home,2));
98  return ES_OK;
99  }
100  x[i] = x[--n];
101  status |= VS_ONE;
102  }
103 
104  assert(status != (VS_ZERO | VS_ONE));
105  if (n == 0) {
106  assert(status != 0);
107  GECODE_ME_CHECK(y.eq(home,1));
108  return ES_OK;
109  }
110  x.size(n);
111 
112  (void) new (home) EqBool<VY>(home,status,x,y);
113  return ES_OK;
114  }
115 
116  template<class VY>
117  ExecStatus
119  if (status == (VS_ZERO | VS_ONE)) {
120  GECODE_ME_CHECK(y.eq(home,2));
121  return home.ES_SUBSUMED(*this);
122  }
123 
124  if (c.empty()) {
125  assert(status != 0);
126  GECODE_ME_CHECK(y.eq(home,1));
127  return home.ES_SUBSUMED(*this);
128  }
129 
130  if (y.max() == 1) {
131  if (status == VS_ZERO) {
132  // Mark that everything is done
133  status = VS_ZERO | VS_ONE;
134  for (Advisors<ViewAdvisor<BoolView> > as(c); as(); ++as)
135  GECODE_ME_CHECK(as.advisor().view().zero(home));
136  return home.ES_SUBSUMED(*this);
137  }
138  if (status == VS_ONE) {
139  // Mark that everything is done
140  status = VS_ZERO | VS_ONE;
141  for (Advisors<ViewAdvisor<BoolView> > as(c); as(); ++as)
142  GECODE_ME_CHECK(as.advisor().view().one(home));
143  return home.ES_SUBSUMED(*this);
144  }
145  }
146 
147  if (y.min() == 2) {
149  assert(as());
151  ++as;
152  if (!as()) {
153  // Only a single view is left
154  if (status == VS_ZERO) {
155  GECODE_ME_CHECK(a.view().one(home));
156  } else if (status == VS_ONE) {
157  GECODE_ME_CHECK(a.view().zero(home));
158  } else {
159  return ES_FAILED;
160  }
161  return home.ES_SUBSUMED(*this);
162  }
163  }
164 
165  return ES_FIX;
166  }
167 
168 }}}
169 
170 // STATISTICS: int-prop
static const int VS_ONE
View status: a one has already been encountered.
Definition: nvalues.hh:298
static ExecStatus post(Home home, ViewArray< BV > &x)
Post propagator .
Definition: eq.hpp:131
static ExecStatus post(Home home, ViewArray< View > &x)
Post propagator .
Definition: nq.hpp:118
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3490
bool one(const Gecode::FloatValArgs &a)
Check whether has only one coefficients.
Definition: linear.cpp:46
static ExecStatus post(Home home, ViewArray< BoolView > &x, VY y)
Post propagator for .
Definition: bool-eq.hpp:57
Class to iterate over advisors of a council.
Definition: core.hpp:155
#define forceinline
Definition: config.hpp:185
Propagation has computed fixpoint.
Definition: core.hpp:476
EqBool(Home home, int status, ViewArray< BoolView > &x, VY y)
Constructor for posting.
Definition: bool-eq.hpp:41
Computation spaces.
Definition: core.hpp:1701
Advisor storing a single view
Definition: advisor.hpp:43
Base-class for both propagators and branchers.
Definition: core.hpp:627
int status
Status information about the views.
Definition: nvalues.hh:300
VY y
The view for counting the number of values.
Definition: nvalues.hh:304
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
int n
Number of negative literals for node type.
Definition: bool-expr.cpp:234
Gecode::IntArgs i({1, 2, 3, 4})
Execution has resulted in failure.
Definition: core.hpp:473
Number of values propagator for Boolean views base class.
Definition: nvalues.hh:293
static const int VS_ZERO
View status: a zero has already been encountered.
Definition: nvalues.hh:296
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:52
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition: bool-eq.hpp:51
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: bool-eq.hpp:118
ExecStatus
Definition: core.hpp:471
Post propagator for SetVar x
Definition: set.hh:767
Execution is okay.
Definition: core.hpp:475
void unique(void)
Remove all duplicate views from array (changes element order)
Definition: array.hpp:1399
Equal to number of values propagator for Boolean views.
Definition: nvalues.hh:327
Gecode toplevel namespace
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1138
Council< ViewAdvisor< BoolView > > c
The advisor council.
Definition: nvalues.hh:302
Home class for posting propagators
Definition: core.hpp:853
A & advisor(void) const
Return advisor.
Definition: core.hpp:3937
struct Gecode::@593::NNF::@62::@64 a
For atomic nodes.