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link-single.hpp
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4  * Christian Schulte <schulte@gecode.org>
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7  * Christian Schulte, 2007
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33 
34 namespace Gecode { namespace Int { namespace Channel {
35 
37  LinkSingle::LinkSingle(Home home, BoolView x0, IntView x1)
38  : MixBinaryPropagator<BoolView,PC_BOOL_VAL,IntView,PC_INT_VAL>
39  (home,x0,x1) {}
40 
43  if (x1.assigned()) {
44  switch (x1.val()) {
45  case 0:
46  GECODE_ME_CHECK(x0.zero(home)); break;
47  case 1:
48  GECODE_ME_CHECK(x0.one(home)); break;
49  default:
50  return ES_FAILED;
51  }
52  } else if (x0.zero()) {
53  GECODE_ME_CHECK(x1.eq(home,0));
54  } else if (x0.one()) {
55  GECODE_ME_CHECK(x1.eq(home,1));
56  } else {
57  GECODE_ME_CHECK(x1.gq(home,0));
58  GECODE_ME_CHECK(x1.lq(home,1));
59  (void) new (home) LinkSingle(home,x0,x1);
60  }
61  return ES_OK;
62  }
63 
64 }}}
65 
66 // STATISTICS: int-prop
67 
bool zero(void) const
Test whether view is assigned to be zero.
Definition: bool.hpp:220
const Gecode::PropCond PC_BOOL_VAL
Propagate when a view becomes assigned (single value)
Definition: var-type.hpp:126
bool assigned(void) const
Test whether view is assigned.
Definition: view.hpp:516
static ExecStatus post(Home home, BoolView x0, IntView x1)
Post propagator for .
Definition: link-single.hpp:42
BoolView x0
View of type View0.
Definition: pattern.hpp:207
bool one(void) const
Test whether view is assigned to be one.
Definition: bool.hpp:224
Link propagator for a single Boolean view.
Definition: channel.hh:171
IntView x1
View of type View1.
Definition: pattern.hpp:209
Boolean view for Boolean variables.
Definition: view.hpp:1380
Gecode toplevel namespace
int val(void) const
Return assigned value (only if assigned)
Definition: int.hpp:70
Home class for posting propagators
Definition: core.hpp:856
const Gecode::PropCond PC_INT_VAL
Propagate when a view becomes assigned (single value)
Definition: var-type.hpp:82
Integer view for integer variables.
Definition: view.hpp:129
#define forceinline
Definition: config.hpp:185
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:52
ModEvent lq(Space &home, int n)
Restrict domain values to be less or equal than n.
Definition: int.hpp:121
ModEvent gq(Space &home, int n)
Restrict domain values to be greater or equal than n.
Definition: int.hpp:139
@ ES_FAILED
Execution has resulted in failure.
Definition: core.hpp:474
@ ES_OK
Execution is okay.
Definition: core.hpp:476
ModEvent eq(Space &home, int n)
Restrict domain values to be equal to n.
Definition: int.hpp:166
ExecStatus
Definition: core.hpp:472