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subofunion.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 *
19 * Permission is hereby granted, free of charge, to any person obtaining
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24 * permit persons to whom the Software is furnished to do so, subject to
25 * the following conditions:
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39
40namespace Gecode { namespace Set { namespace RelOp {
41
42 template<class View0, class View1, class View2>
43 Actor*
45 return new (home) SubOfUnion(home,*this);
46 }
47
48 template<class View0, class View1, class View2>
51
52 bool allassigned = x0.assigned() && x1.assigned() && x2.assigned();
53
54 ModEvent me0 = View0::me(med);
55 ModEvent me1 = View1::me(med);
56 ModEvent me2 = View2::me(med);
57
58 bool modified=false;
59
60 do {
61 // lub(x2) <= lub(x0) u lub(x1)
62 if (modified || Rel::testSetEventUB(me0,me1))
63 {
67 GECODE_ME_CHECK(x2.intersectI(home,u));
68 }
69
70 // x1 <= glb(x2)-lub(x0)
71 // x0 <= glb(x2)-lub(x1)
72 if (modified || Rel::testSetEventAnyB(me0,me1,me2)) {
73 {
74 modified = false;
78 diff(lb2,ub0);
79 GECODE_ME_CHECK_MODIFIED(modified, x1.includeI(home,diff));
80 }
81 {
85 diff(lb2,ub1);
86 GECODE_ME_CHECK_MODIFIED(modified, x0.includeI(home,diff));
87 }
88 } else {
89 modified = false;
90 }
91
92 // cardinality propagation
93 if (modified ||
94 Rel::testSetEventCard(me0,me1,me2) ||
95 Rel::testSetEventLB(me0,me1)
96 ) {
97 GlbRanges<View0> lb0c(x0);
98 GlbRanges<View1> lb1c(x1);
100 inter(lb0c,lb1c);
101
102 unsigned int m = Iter::Ranges::size(inter);
103
104 if (m < x0.cardMax()+x1.cardMax()) {
106 x2.cardMax( home,
107 x0.cardMax()+x1.cardMax() - m ) );
108 }
109 if (m + x2.cardMin() > x1.cardMax()) {
111 x0.cardMin( home,
112 m+x2.cardMin()-x1.cardMax() ) );
113 }
114 if (m + x2.cardMin() > x0.cardMax()) {
116 x1.cardMin( home,
117 m+x2.cardMin()-x0.cardMax() ) );
118 }
119 }
120
121 } while (modified);
122
123 if (shared(x0,x1,x2)) {
124 if (allassigned) {
125 return home.ES_SUBSUMED(*this);
126 } else {
127 return ES_NOFIX;
128 }
129 } else {
130 if (x0.assigned() + x1.assigned() + x2.assigned() >= 2) {
131 return home.ES_SUBSUMED(*this);
132 } else {
133 return ES_FIX;
134 }
135 }
136
137 }
138
139 template<class View0, class View1, class View2>
142 View1 y1, View2 y2)
144 View2,PC_SET_ANY>(home,y0,y1,y2) {}
145
146 template<class View0, class View1, class View2>
152
153 template<class View0, class View1, class View2>
155 (Home home, View0 x0, View1 x1, View2 x2) {
156 (void) new (home) SubOfUnion<View0,View1,View2>(home,x0, x1, x2);
157 return ES_OK;
158 }
159
160}}}
161
162// STATISTICS: set-prop
Home class for posting propagators
Definition core.hpp:856
Range iterator for computing set difference.
Range iterator for computing intersection (binary)
Range iterator for computing union (binary)
friend class Space
Definition core.hpp:1068
ModEventDelta med
A set of modification events (used during propagation)
Definition core.hpp:1077
Range iterator for the greatest lower bound.
Definition var-imp.hpp:359
Range iterator for the least upper bound.
Definition var-imp.hpp:317
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
SubOfUnion(Space &home, SubOfUnion &p)
Constructor for cloning p.
virtual Actor * copy(Space &home)
Copy propagator during cloning.
static ExecStatus post(Home home, View0 x, View1 y, View2 z)
Post propagator .
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_ME_CHECK_MODIFIED(modified, me)
Check whether me is failed or modified, and forward failure.
Definition macros.hpp:64
unsigned int size(I &i)
Size of all ranges of range iterator i.
Standard set operation propagators.
Definition rel-op.hh:46
bool shared(View0 v0, View1 v1, View2 v2)
Definition common.hpp:84
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
bool testSetEventAnyB(ModEvent me0, ModEvent me1, ModEvent me2)
Definition common.hpp:91
Finite integer sets.
Definition var-imp.hpp:137
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
SetExpr inter(const SetVarArgs &)
Intersection of set variables.
Definition set-expr.cpp:696
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
int ModEvent
Type for modification events.
Definition core.hpp:62
#define forceinline
Definition config.hpp:194