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int-lq.hpp
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4  * Christian Schulte <schulte@gecode.org>
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7  * Christian Schulte, 2006
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10  * $Date: 2011-08-29 14:59:24 +0200 (Mon, 29 Aug 2011) $ by $Author: schulte $
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37 
38 namespace Gecode { namespace Int { namespace Count {
39 
40  template<class VX, class VY>
42  LqInt<VX,VY>::LqInt(Home home, ViewArray<VX>& x, int n_s, VY y, int c)
43  : IntBase<VX,VY>(home,x,n_s,y,c) {}
44 
45  template<class VX, class VY>
47  LqInt<VX,VY>::post(Home home, ViewArray<VX>& x, VY y, int c) {
48  // Eliminate decided views
49  int n_x = x.size();
50  for (int i=n_x; i--; )
51  switch (holds(x[i],y)) {
52  case RT_FALSE:
53  x[i] = x[--n_x]; break;
54  case RT_TRUE:
55  x[i] = x[--n_x]; c--; break;
56  case RT_MAYBE:
57  break;
58  default:
60  }
61  x.size(n_x);
62  if (c < 0)
63  return ES_FAILED;
64  if (c >= n_x)
65  return ES_OK;
66  // All views must be different
67  if (c == 0)
68  return post_false(home,x,y);
69  (void) new (home) LqInt<VX,VY>(home,x,n_x-c+1,y,c);
70  return ES_OK;
71  }
72 
73  template<class VX, class VY>
75  LqInt<VX,VY>::LqInt(Space& home, bool share, LqInt<VX,VY>& p)
76  : IntBase<VX,VY>(home,share,p) {}
77 
78  template<class VX, class VY>
79  Actor*
80  LqInt<VX,VY>::copy(Space& home, bool share) {
81  return new (home) LqInt<VX,VY>(home,share,*this);
82  }
83 
84  template<class VX, class VY>
87  // Eliminate decided views from subscribed views
88  int n_x = x.size();
89  for (int i=n_s; i--; )
90  switch (holds(x[i],y)) {
91  case RT_FALSE:
92  x[i].cancel(home,*this,PC_INT_DOM);
93  x[i]=x[--n_s]; x[n_s]=x[--n_x];
94  break;
95  case RT_TRUE:
96  x[i].cancel(home,*this,PC_INT_DOM);
97  x[i]=x[--n_s]; x[n_s]=x[--n_x]; c--;
98  break;
99  case RT_MAYBE:
100  break;
101  default:
102  GECODE_NEVER;
103  }
104  x.size(n_x);
105  if (c < 0)
106  return ES_FAILED;
107  if (c >= n_x)
108  return home.ES_SUBSUMED(*this);
109  // Eliminate decided views from unsubscribed views
110  for (int i=n_x; i-- > n_s; )
111  switch (holds(x[i],y)) {
112  case RT_FALSE: x[i]=x[--n_x]; break;
113  case RT_TRUE: x[i]=x[--n_x]; c--; break;
114  case RT_MAYBE: break;
115  default: GECODE_NEVER;
116  }
117  x.size(n_x);
118  if (c < 0)
119  return ES_FAILED;
120  if (c >= n_x)
121  return home.ES_SUBSUMED(*this);
122  if (c == 0) {
123  // All views must be different
124  GECODE_ES_CHECK(post_false(home,x,y));
125  return home.ES_SUBSUMED(*this);
126  }
127  // Now, there must be new subscriptions from x[n_s] up to x[n_x-c+1]
128  int m = n_x-c;
129  while (n_s <= m)
130  x[n_s++].subscribe(home,*this,PC_INT_DOM,false);
131  return ES_FIX;
132  }
133 
134 }}}
135 
136 // STATISTICS: int-prop
virtual Actor * copy(Space &home, bool share)
Create copy during cloning.
Definition: int-lq.hpp:80
Relation may hold or not.
Definition: view.hpp:1616
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:2973
RelTest holds(VX x, ConstIntView y)
Test whether x and y are equal.
Definition: rel.hpp:96
Baseclass for count propagators (integer)
Definition: count.hh:139
Propagation has computed fixpoint.
Definition: core.hpp:528
Computation spaces.
Definition: core.hpp:1362
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, int c)
Post propagator for .
Definition: int-lq.hpp:47
Base-class for both propagators and branchers.
Definition: core.hpp:666
Propagator for counting views (less or equal integer to number of equal views)
Definition: count.hh:231
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:84
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)
Execution has resulted in failure.
Definition: core.hpp:525
Relation does not hold.
Definition: view.hpp:1615
const Gecode::PropCond PC_INT_DOM
Propagate when domain changes.
Definition: var-type.hpp:100
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: int-lq.hpp:86
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
LqInt(Space &home, bool share, LqInt &p)
Constructor for cloning p.
Definition: int-lq.hpp:75
Gecode toplevel namespace
ExecStatus post_false(Home home, VX x, ConstIntView y)
Definition: rel.hpp:175
int ModEventDelta
Modification event deltas.
Definition: core.hpp:173
Home class for posting propagators
Definition: core.hpp:717
#define GECODE_NEVER
Assert that this command is never executed.
Definition: macros.hpp:60
Relation does hold.
Definition: view.hpp:1617