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subset.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
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39
40namespace Gecode { namespace Set { namespace Rel {
41
42 template<class View0, class View1>
44 Subset<View0,View1>::Subset(Home home, View0 y0, View1 y1)
46 View1,PC_SET_CLUB>(home,y0,y1) {}
47
48 template<class View0, class View1>
53
54 template<class View0, class View1>
56 if (!same(x,y))
57 (void) new (home) Subset(home,x,y);
58 return ES_OK;
59 }
60
61 template<class View0, class View1>
62 Actor*
64 return new (home) Subset(home,*this);
65 }
66
67 template<class View0, class View1>
70 bool oneassigned = x0.assigned() || x1.assigned();
71 unsigned int x0glbsize;
72 do {
73 GlbRanges<View0> x0lb(x0);
74 GECODE_ME_CHECK ( x1.includeI(home,x0lb) );
75 GECODE_ME_CHECK ( x1.cardMin(home,x0.cardMin()) );
76 LubRanges<View1> x1ub(x1);
77 x0glbsize = x0.glbSize();
78 GECODE_ME_CHECK ( x0.intersectI(home,x1ub) );
79 GECODE_ME_CHECK ( x0.cardMax(home,x1.cardMax()) );
80 } while (x0.glbSize() > x0glbsize);
81
82 if (x0.cardMin() == x1.cardMax())
83 GECODE_REWRITE(*this,(Eq<View0,View1>::post(home(*this),x0,x1)));
84
85 if (shared(x0,x1)) {
86 return oneassigned ? home.ES_SUBSUMED(*this) : ES_NOFIX;
87 }
88 return (x0.assigned() || x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_FIX;
89 }
90
91}}}
92
93// STATISTICS: set-prop
Base-class for both propagators and branchers.
Definition core.hpp:628
Home class for posting propagators
Definition core.hpp:856
friend class Space
Definition core.hpp:1068
Range iterator for the greatest lower bound.
Definition var-imp.hpp:359
Range iterator for the least upper bound.
Definition var-imp.hpp:317
static ExecStatus post(Home home, View0 x, View1 y)
Post propagator .
Definition eq.hpp:54
Subset(Space &home, Subset &p)
Constructor for cloning p.
Definition subset.hpp:50
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition subset.hpp:63
static ExecStatus post(Home home, View0 x, View1 y)
Post propagator .
Definition subset.hpp:55
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition subset.hpp:69
ExecStatus ES_SUBSUMED(Propagator &p)
Propagator p is subsumed
Definition core.hpp:3570
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
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition macros.hpp:116
Standard set relation propagators.
Definition rel.hh:45
Finite integer sets.
Definition var-imp.hpp:137
const Gecode::PropCond PC_SET_CLUB
Propagate when the cardinality or the least upper bound of a view changes.
Definition var-type.hpp:227
const Gecode::PropCond PC_SET_CGLB
Propagate when the cardinality or the greatest lower bound of a view changes.
Definition var-type.hpp:238
Gecode toplevel namespace
bool same(VarArgArray< Var > x, VarArgArray< Var > y)
Definition array.hpp:1943
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
@ ES_FIX
Propagation has computed fixpoint.
Definition core.hpp:477
@ ES_NOFIX
Propagation has not computed fixpoint.
Definition core.hpp:475
bool shared(ViewArray< ViewX > x, ViewArray< ViewY > y)
Definition array.hpp:1472
Post propagator for SetVar x
Definition set.hh:773
#define forceinline
Definition config.hpp:194