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link-multi.hpp
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1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
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7 * Christian Schulte, 2007
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33
34namespace Gecode { namespace Int { namespace Channel {
35
37 LinkMulti::LinkMulti(Home home, ViewArray<BoolView>& x, IntView y, int o0)
38 : MixNaryOnePropagator<BoolView,PC_BOOL_NONE,IntView,PC_INT_DOM>
39 (home,x,y), c(home), status(S_NONE), o(o0) {
40 x.subscribe(home,*new (home) Advisor(home,*this,c));
41 // Propagator is scheduled because of the dependency subscription
42 }
43
45 LinkMulti::LinkMulti(Space& home, LinkMulti& p)
46 : MixNaryOnePropagator<BoolView,PC_BOOL_NONE,IntView,PC_INT_DOM>
47 (home,p), status(S_NONE), o(p.o) {
48 assert(p.status == S_NONE);
49 c.update(home,p.c);
50 }
51
54 int n=x.size();
55 GECODE_ME_CHECK(y.gq(home,o));
56 GECODE_ME_CHECK(y.lq(home,o+n-1));
57 assert(n > 0);
58 if (n == 1) {
59 GECODE_ME_CHECK(x[0].one(home));
60 assert(y.val() == o);
61 } else if (y.assigned()) {
62 int j=y.val()-o;
63 GECODE_ME_CHECK(x[j].one(home));
64 for (int i=0; i<j; i++)
65 GECODE_ME_CHECK(x[i].zero(home));
66 for (int i=j+1; i<n; i++)
67 GECODE_ME_CHECK(x[i].zero(home));
68 } else {
69 for (int i=0; i<n; i++)
70 if (x[i].one()) {
71 for (int j=0; j<i; j++)
72 GECODE_ME_CHECK(x[j].zero(home));
73 for (int j=i+1; j<n; j++)
74 GECODE_ME_CHECK(x[j].zero(home));
75 GECODE_ME_CHECK(y.eq(home,o+i));
76 return ES_OK;
77 } else if (x[i].zero()) {
78 GECODE_ME_CHECK(y.nq(home,o+i));
79 }
80 (void) new (home) LinkMulti(home,x,y,o);
81 }
82 return ES_OK;
83 }
84
85}}}
86
87// STATISTICS: int-prop
88
Home class for posting propagators
Definition core.hpp:856
static ExecStatus post(Home home, ViewArray< BoolView > &x, IntView y, int o)
Post propagator for .
Integer view for integer variables.
Definition view.hpp:129
View arrays.
Definition array.hpp:253
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition macros.hpp:52
Channel propagators
Finite domain integers.
const Gecode::PropCond PC_BOOL_NONE
Propagation condition to be ignored (convenience)
Definition var-type.hpp:118
const Gecode::PropCond PC_INT_DOM
Propagate when domain changes.
Definition var-type.hpp:100
Gecode toplevel namespace
Post propagator for SetVar SetOpType SetVar y
Definition set.hh:773
ExecStatus
Definition core.hpp:472
@ ES_OK
Execution is okay.
Definition core.hpp:476
Post propagator for SetVar x
Definition set.hh:773
Gecode::FloatVal c(-8, 8)
#define forceinline
Definition config.hpp:194