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pair.hpp
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7  * Christian Schulte, 2009
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33 
34 #include <gecode/int/rel.hh>
35 
36 namespace Gecode { namespace Int { namespace Element {
37 
39  Pair::Pair(Home home, IntView x0, IntView x1, IntView x2, int w0)
40  : TernaryPropagator<IntView,PC_INT_DOM>(home,x0,x1,x2), w(w0) {}
41 
42  inline ExecStatus
44  int w, int h) {
45  GECODE_ME_CHECK(x0.gq(home,0)); GECODE_ME_CHECK(x0.le(home,w));
46  GECODE_ME_CHECK(x1.gq(home,0)); GECODE_ME_CHECK(x1.le(home,h));
47  GECODE_ME_CHECK(x2.gq(home,0)); GECODE_ME_CHECK(x2.le(home,w*h));
48  if (x0.assigned() && x1.assigned()) {
49  GECODE_ME_CHECK(x2.eq(home,x0.val()+w*x1.val()));
50  } else if (x1.assigned()) {
51  OffsetView x0x1w(x0,x1.val()*w);
52  return Rel::EqDom<OffsetView,IntView>::post(home,x0x1w,x2);
53  } else if (x2.assigned()) {
54  GECODE_ME_CHECK(x0.eq(home,x2.val() % w));
55  GECODE_ME_CHECK(x1.eq(home,static_cast<int>(x2.val() / w)));
56  } else {
57  assert(!shared(x0,x2) && !shared(x1,x2));
58  (void) new (home) Pair(home,x0,x1,x2,w);
59  }
60  return ES_OK;
61  }
62 
65  : TernaryPropagator<IntView,PC_INT_DOM>(home,p), w(p.w) {}
66 
67 }}}
68 
69 // STATISTICS: int-prop
70 
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
Home class for posting propagators
Definition: core.hpp:856
Domain consistent pair propagator.
Definition: element.hh:298
Pair(Space &home, Pair &p)
Constructor for cloning p.
Definition: pair.hpp:64
static ExecStatus post(Home home, IntView x0, IntView x1, IntView x2, int w, int h)
Post propagator .
Definition: pair.hpp:43
Integer view for integer variables.
Definition: view.hpp:129
ModEvent le(Space &home, int n)
Restrict domain values to be less than n.
Definition: int.hpp:130
ModEvent gq(Space &home, int n)
Restrict domain values to be greater or equal than n.
Definition: int.hpp:139
int val(void) const
Return assigned value (only if assigned)
Definition: int.hpp:70
ModEvent eq(Space &home, int n)
Restrict domain values to be equal to n.
Definition: int.hpp:166
Offset integer view.
Definition: view.hpp:443
static ExecStatus post(Home home, View0 x0, View1 x1)
Post domain consistent propagator .
Definition: eq.hpp:176
Computation spaces.
Definition: core.hpp:1742
Ternary propagator.
Definition: pattern.hpp:113
bool assigned(void) const
Test whether view is assigned.
Definition: view.hpp:516
ExecStatus
Definition: core.hpp:472
@ ES_OK
Execution is okay.
Definition: core.hpp:476
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:52
bool shared(const IntSet &, VX)
Definition: view-base.hpp:118
const Gecode::PropCond PC_INT_DOM
Propagate when domain changes.
Definition: var-type.hpp:100
#define forceinline
Definition: config.hpp:192