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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
8  *
9  * Last modified:
10  * $Date: 2009-10-13 02:36:53 +1100 (Tue, 13 Oct 2009) $ by $Author: schulte $
11  * $Revision: 9878 $
12  *
13  * This file is part of Gecode, the generic constraint
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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