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eq.hpp
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1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Guido Tack <tack@gecode.org>
5 * Christian Schulte <schulte@gecode.org>
6 *
7 * Contributing authors:
8 * Gabor Szokoli <szokoli@gecode.org>
9 *
10 * Copyright:
11 * Guido Tack, 2004
12 * Christian Schulte, 2004
13 * Gabor Szokoli, 2004
14 *
15 * This file is part of Gecode, the generic constraint
16 * development environment:
17 * http://www.gecode.org
18 *
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39
40namespace Gecode { namespace Set { namespace Rel {
41
42 template<class View0, class View1>
44 Eq<View0,View1>::Eq(Home home, View0 x, View1 y)
45 : MixBinaryPropagator<View0,PC_SET_ANY,View1,PC_SET_ANY>(home,x,y) {}
46
47 template<class View0, class View1>
51
52 template<class View0, class View1>
54 Eq<View0,View1>::post(Home home, View0 x, View1 y) {
55 if (!same(x,y))
56 (void) new (home) Eq(home,x,y);
57 return ES_OK;
58 }
59
60 template<class View0, class View1>
61 Actor*
63 return new (home) Eq(home,*this);
64 }
65
66 template<class View0, class View1>
69
70 ModEvent me0 = View0::me(med);
71 ModEvent me1 = View1::me(med);
72
73 Region r;
74
75 if (testSetEventLB(me0,me1)) {
76 GlbRanges<View0> x0lb(x0);
77 GlbRanges<View1> x1lb(x1);
79 Iter::Ranges::Cache lbuc(r,lbu);
80 GECODE_ME_CHECK(x0.includeI(home,lbuc));
81 lbuc.reset();
82 GECODE_ME_CHECK(x1.includeI(home,lbuc));
83 }
84
85 if (testSetEventUB(me0,me1)) {
86 LubRanges<View0> x0ub(x0);
87 LubRanges<View1> x1ub(x1);
89 Iter::Ranges::Cache ubic(r,ubi);
90 GECODE_ME_CHECK(x0.intersectI(home,ubic));
91 ubic.reset();
92 GECODE_ME_CHECK(x1.intersectI(home,ubic));
93 }
94
95 if (testSetEventCard(me0,me1)) {
96 unsigned int max = std::min(x0.cardMax(),x1.cardMax());
97 unsigned int min = std::max(x0.cardMin(),x1.cardMin());
98 GECODE_ME_CHECK(x0.cardMax(home,max));
99 GECODE_ME_CHECK(x1.cardMax(home,max));
100 GECODE_ME_CHECK(x0.cardMin(home,min));
101 GECODE_ME_CHECK(x1.cardMin(home,min));
102 }
103
104 if (x0.assigned()) {
105 assert (x1.assigned());
106 return home.ES_SUBSUMED(*this);
107 }
108 return shared(x0,x1) ? ES_NOFIX : ES_FIX;
109 }
110
111}}}
112
113// STATISTICS: set-prop
int p
Number of positive literals for node type.
Base-class for both propagators and branchers.
Definition core.hpp:628
Home class for posting propagators
Definition core.hpp:856
Range iterator cache
Range iterator for computing intersection (binary)
void reset(void)
Reset iterator to start.
Range iterator for computing union (binary)
Mixed binary propagator.
Definition pattern.hpp:204
Handle to region.
Definition region.hpp:55
Range iterator for the greatest lower bound.
Definition var-imp.hpp:359
Range iterator for the least upper bound.
Definition var-imp.hpp:317
Propagator for set equality
Definition rel.hh:150
Eq(Space &home, Eq &p)
Constructor for cloning p.
Definition eq.hpp:49
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition eq.hpp:68
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition eq.hpp:62
static ExecStatus post(Home home, View0 x, View1 y)
Post propagator .
Definition eq.hpp:54
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
bool testSetEventLB(ModEvent me0, ModEvent me1, ModEvent me2)
Definition common.hpp:83
bool testSetEventCard(ModEvent me0, ModEvent me1, ModEvent me2)
Definition common.hpp:95
bool testSetEventUB(ModEvent me0, ModEvent me1, ModEvent me2)
Definition common.hpp:87
const Gecode::PropCond PC_SET_ANY
Propagate when any bound or the cardinality of a view changes.
Definition var-type.hpp:248
Gecode toplevel namespace
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition set.hh:767
void min(Home home, FloatVar x0, FloatVar x1, FloatVar x2)
Post propagator for .
bool same(VarArgArray< Var > x, VarArgArray< Var > y)
Definition array.hpp:1937
Post propagator for SetVar SetOpType SetVar y
Definition set.hh:767
ExecStatus
Definition core.hpp:472
@ ES_OK
Execution is okay.
Definition core.hpp:476
@ ES_FIX
Propagation has computed fixpoint.
Definition core.hpp:477
@ ES_NOFIX
Propagation has not computed fixpoint.
Definition core.hpp:475
void max(Home home, FloatVar x0, FloatVar x1, FloatVar x2)
Post propagator for .
bool shared(ViewArray< ViewX > x, ViewArray< ViewY > y)
Definition array.hpp:1466
Post propagator for SetVar x
Definition set.hh:767
int ModEvent
Type for modification events.
Definition core.hpp:62
#define forceinline
Definition config.hpp:187