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link-single.hpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2007
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10  * $Date: 2009-10-12 17:36:53 +0200 (Mon, 12 Oct 2009) $ by $Author: schulte $
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37 
38 namespace Gecode { namespace Int { namespace Channel {
39 
41  LinkSingle::LinkSingle(Home home, BoolView x0, IntView x1)
42  : MixBinaryPropagator<BoolView,PC_BOOL_VAL,IntView,PC_INT_VAL>
43  (home,x0,x1) {}
44 
47  if (x1.assigned()) {
48  switch (x1.val()) {
49  case 0:
50  GECODE_ME_CHECK(x0.zero(home)); break;
51  case 1:
52  GECODE_ME_CHECK(x0.one(home)); break;
53  default:
54  return ES_FAILED;
55  }
56  } else if (x0.zero()) {
57  GECODE_ME_CHECK(x1.eq(home,0));
58  } else if (x0.one()) {
59  GECODE_ME_CHECK(x1.eq(home,1));
60  } else {
61  GECODE_ME_CHECK(x1.gq(home,0));
62  GECODE_ME_CHECK(x1.lq(home,1));
63  (void) new (home) LinkSingle(home,x0,x1);
64  }
65  return ES_OK;
66  }
67 
68 }}}
69 
70 // STATISTICS: int-prop
71 
int val(void) const
Return assigned value (only if assigned)
Definition: int.hpp:70
static ExecStatus post(Home home, BoolView x0, IntView x1)
Post propagator for .
Definition: link-single.hpp:46
ModEvent eq(Space &home, int n)
Restrict domain values to be equal to n.
Definition: int.hpp:160
Execution has resulted in failure.
Definition: core.hpp:525
ModEvent lq(Space &home, int n)
Restrict domain values to be less or equal than n.
Definition: int.hpp:115
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:45
bool one(void) const
Test whether view is assigned to be one.
Definition: bool.hpp:218
Integer view for integer variables.
Definition: view.hpp:129
Link propagator for a single Boolean view.
Definition: channel.hh:172
ExecStatus
Definition: core.hpp:523
#define forceinline
Definition: config.hpp:132
bool assigned(void) const
Test whether view is assigned.
Definition: view.hpp:448
ModEvent gq(Space &home, int n)
Restrict domain values to be greater or equal than n.
Definition: int.hpp:133
Execution is okay.
Definition: core.hpp:527
Gecode toplevel namespace
bool zero(void) const
Test whether view is assigned to be zero.
Definition: bool.hpp:214
Home class for posting propagators
Definition: core.hpp:717
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
Boolean view for Boolean variables.
Definition: view.hpp:1315