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link-single.cpp
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3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
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7  * Christian Schulte, 2007
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33 
34 #include <gecode/int/channel.hh>
35 
36 namespace Gecode { namespace Int { namespace Channel {
37 
39  LinkSingle::LinkSingle(Space& home, LinkSingle& p)
40  : MixBinaryPropagator<BoolView,PC_BOOL_VAL,IntView,PC_INT_VAL>
41  (home,p) {}
42 
43  Actor*
44  LinkSingle::copy(Space& home) {
45  return new (home) LinkSingle(home,*this);
46  }
47 
48  PropCost
49  LinkSingle::cost(const Space&, const ModEventDelta&) const {
50  return PropCost::unary(PropCost::LO);
51  }
52 
54  LinkSingle::propagate(Space& home, const ModEventDelta&) {
55  if (x0.zero()) {
56  GECODE_ME_CHECK(x1.eq(home,0));
57  } else if (x0.one()) {
58  GECODE_ME_CHECK(x1.eq(home,1));
59  } else {
60  assert(x0.none() && x1.assigned());
61  if (x1.val() == 0) {
62  GECODE_ME_CHECK(x0.zero_none(home));
63  } else {
64  assert(x1.val() == 1);
65  GECODE_ME_CHECK(x0.one_none(home));
66  }
67  }
68  return home.ES_SUBSUMED(*this);
69  }
70 
71 }}}
72 
73 // STATISTICS: int-prop
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
Link propagator for a single Boolean view.
Definition: channel.hh:171
Propagation cost.
Definition: core.hpp:486
Computation spaces.
Definition: core.hpp:1742
ExecStatus
Definition: core.hpp:472
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3563
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:52
const Gecode::PropCond PC_INT_VAL
Propagate when a view becomes assigned (single value)
Definition: var-type.hpp:82
const Gecode::PropCond PC_BOOL_VAL
Propagate when a view becomes assigned (single value)
Definition: var-type.hpp:126
#define forceinline
Definition: config.hpp:192