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link-single.cpp
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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 * This file is part of Gecode, the generic constraint
10 * development environment:
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33
34#include <gecode/int/channel.hh>
35
36namespace Gecode { namespace Int { namespace Channel {
37
39 LinkSingle::LinkSingle(Space& home, LinkSingle& p)
40 : MixBinaryPropagator<BoolView,PC_BOOL_VAL,IntView,PC_INT_VAL>
41 (home,p) {}
42
43 Actor*
44 LinkSingle::copy(Space& home) {
45 return new (home) LinkSingle(home,*this);
46 }
47
49 LinkSingle::cost(const Space&, const ModEventDelta&) const {
50 return PropCost::unary(PropCost::LO);
51 }
52
54 LinkSingle::propagate(Space& home, const ModEventDelta&) {
55 if (x0.zero()) {
56 GECODE_ME_CHECK(x1.eq(home,0));
57 } else if (x0.one()) {
58 GECODE_ME_CHECK(x1.eq(home,1));
59 } else {
60 assert(x0.none() && x1.assigned());
61 if (x1.val() == 0) {
62 GECODE_ME_CHECK(x0.zero_none(home));
63 } else {
64 assert(x1.val() == 1);
65 GECODE_ME_CHECK(x0.one_none(home));
66 }
67 }
68 return home.ES_SUBSUMED(*this);
69 }
70
71}}}
72
73// STATISTICS: int-prop
int p
Number of positive literals for node type.
Link propagator for a single Boolean view.
Definition channel.hh:171
Propagation cost.
Definition core.hpp:486
Computation spaces.
Definition core.hpp:1742
ExecStatus ES_SUBSUMED(Propagator &p)
Definition core.hpp:3563
int ModEventDelta
Modification event deltas.
Definition core.hpp:89
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition macros.hpp:52
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
Gecode toplevel namespace
ExecStatus
Definition core.hpp:472
#define forceinline
Definition config.hpp:187