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superofinter.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
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39
40namespace Gecode { namespace Set { namespace RelOp {
41
42 template<class View0, class View1, class View2>
45 (Home home, View0 y0, View1 y1, View2 y2)
47 View2,PC_SET_CLUB>(home,y0,y1,y2) {}
48
49 template<class View0, class View1, class View2>
55
56 template<class View0, class View1, class View2>
59 View0 x0, View1 x1, View2 x2) {
60 (void) new (home) SuperOfInter<View0,View1,View2>(home, x0, x1, x2);
61 return ES_OK;
62 }
63
64 template<class View0, class View1, class View2>
65 Actor*
67 return new (home) SuperOfInter(home,*this);
68 }
69
70 template<class View0, class View1, class View2>
73
74 bool allassigned = x0.assigned() && x1.assigned() && x2.assigned();
75
76 ModEvent me0 = View0::me(med);
77 ModEvent me1 = View1::me(med);
78 ModEvent me2 = View2::me(med);
79
80 bool modified = false;
81
82 do {
83 // glb(x2) >= glb(x0) ^ glb(x1)
84 if ( modified || Rel::testSetEventLB(me0,me1)) {
88 is(lb0, lb1);
89
90 GECODE_ME_CHECK_MODIFIED(modified,x2.includeI(home,is));
91 }
92
93 // lub(x0) -= glb(x1)-lub(x2)
94 // lub(x1) -= glb(x0)-lub(x2)
95 if ( modified || Rel::testSetEventAnyB(me0,me1,me2)) {
96 modified = false;
97 GlbRanges<View1> lb12(x1);
98 LubRanges<View2> ub22(x2);
100 diff1(lb12, ub22);
101
102 GECODE_ME_CHECK_MODIFIED(modified, x0.excludeI(home,diff1));
103
104 GlbRanges<View0> lb01(x0);
105 LubRanges<View2> ub23(x2);
107 diff2(lb01, ub23);
108
109 GECODE_ME_CHECK_MODIFIED(modified, x1.excludeI(home,diff2));
110 } else {
111 modified = false;
112 }
113
114 // Cardinality propagation
115 if ( modified ||
116 Rel::testSetEventCard(me0,me1,me2) ||
117 Rel::testSetEventUB(me0,me1)
118 ) {
119
120 LubRanges<View0> ub0(x0);
121 LubRanges<View1> ub1(x1);
123
124 unsigned int m = Iter::Ranges::size(u);
125
126 if (m < x0.cardMin() + x1.cardMin()) {
128 x2.cardMin( home,
129 x0.cardMin()+x1.cardMin() - m ) );
130 }
131 if (m + x2.cardMax() > x1.cardMin()) {
133 x0.cardMax( home,
134 m+x2.cardMax()-x1.cardMin() ) );
135 }
136 if (m + x2.cardMax() > x0.cardMin()) {
138 x1.cardMax( home,
139 m+x2.cardMax()-x0.cardMin() ) );
140 }
141 }
142 } while (modified);
143
144
145 if (shared(x0,x1,x2)) {
146 if (allassigned) {
147 return home.ES_SUBSUMED(*this);
148 } else {
149 return ES_NOFIX;
150 }
151 } else {
152 if (x0.assigned() + x1.assigned() + x2.assigned() >= 2) {
153 return home.ES_SUBSUMED(*this);
154 } else {
155 return ES_FIX;
156 }
157 }
158
159 }
160
161}}}
162
163// STATISTICS: set-prop
Base-class for both propagators and branchers.
Definition core.hpp:628
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 Actor * copy(Space &home)
Copy propagator during cloning.
static ExecStatus post(Home home, View0 x, View1 y, View2 z)
Post propagator .
SuperOfInter(Space &home, SuperOfInter &p)
Constructor for cloning p.
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
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_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_CLUB
Propagate when the cardinality or the least upper bound of a view changes.
Definition var-type.hpp:227
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
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