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int-gq.hpp
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33 
34 #include <gecode/int/rel.hh>
35 #include <gecode/int/distinct.hh>
36 
37 namespace Gecode { namespace Int { namespace NValues {
38 
39  template<class VY>
42  : IntBase<VY>(home,vs,x,y) {}
43 
44  template<class VY>
45  inline ExecStatus
47  if (x.size() == 0) {
48  GECODE_ME_CHECK(y.lq(home,0));
49  return ES_OK;
50  }
51 
52  x.unique();
53 
54  if (x.size() == 1) {
55  GECODE_ME_CHECK(y.lq(home,1));
56  return ES_OK;
57  }
58 
59  GECODE_ME_CHECK(y.lq(home,x.size()));
60 
61  if (y.max() <= 1)
62  return ES_OK;
63 
64  if (y.min() == x.size()) {
65  assert(y.assigned());
66  return Distinct::Dom<IntView>::post(home,x);
67  }
68 
69  // Eliminate assigned views and store them into the value set
70  ValSet vs;
71  int n = x.size();
72  for (int i=n; i--; )
73  if (x[i].assigned()) {
74  vs.add(home, x[i].val());
75  x[i] = x[--n];
76  }
77 
78  GECODE_ME_CHECK(y.lq(home,n + vs.size()));
79 
80  if (n == 0) {
81  assert(vs.size() >= y.max());
82  return ES_OK;
83  }
84 
85  x.size(n);
86 
87  (void) new (home) GqInt<VY>(home, vs, x, y);
88  return ES_OK;
89  }
90 
91  template<class VY>
94  : IntBase<VY>(home, p) {}
95 
96  template<class VY>
97  Propagator*
99  return new (home) GqInt<VY>(home, *this);
100  }
101 
102  template<class VY>
103  ExecStatus
105  if (IntView::me(med) == ME_INT_VAL)
106  add(home);
107 
108  // Eliminate subsumed views
109  eliminate(home);
110 
111  GECODE_ME_CHECK(y.lq(home, x.size() + vs.size()));
112 
113  if (x.size() == 0)
114  return home.ES_SUBSUMED(*this);
115 
116  if (vs.size() >= y.max())
117  return home.ES_SUBSUMED(*this);
118 
119  GECODE_ES_CHECK(prune_upper(home,g));
120 
121  return ES_NOFIX;
122  }
123 
124 }}}
125 
126 // STATISTICS: int-prop
Post propagator for SetVar x
Definition: set.hh:767
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3563
static ExecStatus post(Home home, ViewArray< View > &x)
Post propagator for views x.
Definition: dom.hpp:45
Class for storing values of already assigned views.
Definition: val-set.hh:44
bool assigned(View x, int v)
Whether x is assigned to value v.
Definition: single.hpp:43
GqInt(Home home, ValSet &vs, ViewArray< IntView > &x, VY y)
Constructor for posting.
Definition: int-gq.hpp:41
Number of values propagator for integer views base class.
Definition: nvalues.hh:133
Computation spaces.
Definition: core.hpp:1742
bool assigned(void) const
Test whether view is assigned.
Definition: var.hpp:111
const Gecode::ModEvent ME_INT_VAL
Domain operation has resulted in a value (assigned variable)
Definition: var-type.hpp:56
void eliminate(Term< BoolView > *t, int &n, long long int &d)
Eliminate assigned views.
Definition: bool-post.cpp:43
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: int-gq.hpp:104
Gecode toplevel namespace
Base-class for propagators.
Definition: core.hpp:1064
int size(void) const
Return size (number of values)
Definition: val-set.hpp:81
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:91
Home class for posting propagators
Definition: core.hpp:856
static ModEvent me(const ModEventDelta &med)
Return modification event for view type in med.
Definition: view.hpp:552
static ExecStatus post(Home home, ViewArray< IntView > &x, VY y)
Post propagator for .
Definition: int-gq.hpp:46
#define forceinline
Definition: config.hpp:192
virtual Propagator * copy(Space &home)
Copy propagator during cloning.
Definition: int-gq.hpp:98
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:52
int n
Number of negative literals for node type.
Definition: bool-expr.cpp:234
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
@ ES_NOFIX
Propagation has not computed fixpoint.
Definition: core.hpp:475
Gecode::IntArgs i({1, 2, 3, 4})
@ ES_OK
Execution is okay.
Definition: core.hpp:476
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
void add(Space &home, int v)
Add value v to value set.
Definition: val-set.hpp:45
ExecStatus
Definition: core.hpp:472
Greater or equal to number of values propagator for integer views.
Definition: nvalues.hh:251