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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
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33
34namespace Gecode { namespace Int { namespace Channel {
35
37 LinkSingle::LinkSingle(Home home, BoolView x0, IntView x1)
38 : MixBinaryPropagator<BoolView,PC_BOOL_VAL,IntView,PC_INT_VAL>
39 (home,x0,x1) {}
40
42 LinkSingle::post(Home home, BoolView x0, IntView x1) {
43 if (x1.assigned()) {
44 switch (x1.val()) {
45 case 0:
46 GECODE_ME_CHECK(x0.zero(home)); break;
47 case 1:
48 GECODE_ME_CHECK(x0.one(home)); break;
49 default:
50 return ES_FAILED;
51 }
52 } else if (x0.zero()) {
53 GECODE_ME_CHECK(x1.eq(home,0));
54 } else if (x0.one()) {
55 GECODE_ME_CHECK(x1.eq(home,1));
56 } else {
57 GECODE_ME_CHECK(x1.gq(home,0));
58 GECODE_ME_CHECK(x1.lq(home,1));
59 (void) new (home) LinkSingle(home,x0,x1);
60 }
61 return ES_OK;
62 }
63
64}}}
65
66// STATISTICS: int-prop
67
Home class for posting propagators
Definition core.hpp:856
Boolean view for Boolean variables.
Definition view.hpp:1380
bool zero(void) const
Test whether view is assigned to be zero.
Definition bool.hpp:220
bool one(void) const
Test whether view is assigned to be one.
Definition bool.hpp:224
Link propagator for a single Boolean view.
Definition channel.hh:171
Integer view for integer variables.
Definition view.hpp:129
ModEvent lq(Space &home, int n)
Restrict domain values to be less or equal than n.
Definition int.hpp:121
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
bool assigned(void) const
Test whether view is assigned.
Definition view.hpp:516
#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
@ ES_OK
Execution is okay.
Definition core.hpp:476
@ ES_FAILED
Execution has resulted in failure.
Definition core.hpp:474
#define forceinline
Definition config.hpp:187