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link-multi.hpp
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4  * Christian Schulte <schulte@gecode.org>
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7  * Christian Schulte, 2007
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37 
38 namespace Gecode { namespace Int { namespace Channel {
39 
41  LinkMulti::LinkMulti(Home home, ViewArray<BoolView>& x, IntView y, int o0)
42  : MixNaryOnePropagator<BoolView,PC_BOOL_NONE,IntView,PC_INT_DOM>
43  (home,x,y), c(home), status(S_NONE), o(o0) {
44  x.subscribe(home,*new (home) Advisor(home,*this,c));
45  // Propagator is scheduled because of the dependency subscription
46  }
47 
49  LinkMulti::LinkMulti(Space& home, bool share, LinkMulti& p)
50  : MixNaryOnePropagator<BoolView,PC_BOOL_NONE,IntView,PC_INT_DOM>
51  (home,share,p), status(S_NONE), o(p.o) {
52  assert(p.status == S_NONE);
53  c.update(home,share,p.c);
54  }
55 
58  int n=x.size();
59  GECODE_ME_CHECK(y.gq(home,o));
60  GECODE_ME_CHECK(y.lq(home,o+n-1));
61  assert(n > 0);
62  if (n == 1) {
63  GECODE_ME_CHECK(x[0].one(home));
64  assert(y.val() == o);
65  } else if (y.assigned()) {
66  int j=y.val()-o;
67  GECODE_ME_CHECK(x[j].one(home));
68  for (int i=0; i<j; i++)
69  GECODE_ME_CHECK(x[i].zero(home));
70  for (int i=j+1; i<n; i++)
71  GECODE_ME_CHECK(x[i].zero(home));
72  } else {
73  for (int i=n; i--; )
74  if (x[i].one()) {
75  for (int j=0; j<i; j++)
76  GECODE_ME_CHECK(x[j].zero(home));
77  for (int j=i+1; j<n; j++)
78  GECODE_ME_CHECK(x[j].zero(home));
79  GECODE_ME_CHECK(y.eq(home,o+i));
80  return ES_OK;
81  } else if (x[i].zero()) {
82  GECODE_ME_CHECK(y.nq(home,o+i));
83  }
84  (void) new (home) LinkMulti(home,x,y,o);
85  }
86  return ES_OK;
87  }
88 
89 }}}
90 
91 // STATISTICS: int-prop
92 
IntView y
Single view.
Definition: propagator.hpp:287
const Gecode::PropCond PC_BOOL_NONE
Propagation condition to be ignored (convenience)
Definition: var-type.hpp:118
Post propagator for SetVar x
Definition: set.hh:784
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:784
#define forceinline
Definition: config.hpp:173
bool assigned(void) const
Test whether view is assigned.
void subscribe(Space &home, Propagator &p, PropCond pc, bool schedule=true)
Subscribe propagator p with propagation condition pc to variable.
Definition: array.hpp:1400
ViewArray< BoolView > x
Array of views.
Definition: propagator.hpp:285
Gecode::IntArgs i(4, 1, 2, 3, 4)
static ExecStatus post(Home home, ViewArray< BoolView > &x, IntView y, int o)
Post propagator for .
Definition: link-multi.hpp:57
Gecode toplevel namespace
Link propagator for multiple Boolean views.
Definition: channel.hh:201
int val(void) const
Return assigned value (only if assigned)
Definition: int.hpp:70
Home class for posting propagators
Definition: core.hpp:922
ModEvent nq(Space &home, int n)
Restrict domain values to be different from n.
Definition: int.hpp:151
bool one(const Gecode::FloatValArgs &a)
Check whether has only one coefficients.
Definition: linear.cpp:50
Integer view for integer variables.
Definition: view.hpp:129
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1215
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:56
ModEvent lq(Space &home, int n)
Restrict domain values to be less or equal than n.
Definition: int.hpp:115
Gecode::FloatVal c(-8, 8)
ModEvent gq(Space &home, int n)
Restrict domain values to be greater or equal than n.
Definition: int.hpp:133
int n
Number of negative literals for node type.
Definition: bool-expr.cpp:238
const Gecode::PropCond PC_INT_DOM
Propagate when domain changes.
Definition: var-type.hpp:100
@ ES_OK
Execution is okay.
Definition: core.hpp:544
friend class Advisor
Definition: core.hpp:1096
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
ModEvent eq(Space &home, int n)
Restrict domain values to be equal to n.
Definition: int.hpp:160
ExecStatus
Definition: core.hpp:540