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re-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 * Copyright:
8 * Guido Tack, 2004
9 * Christian Schulte, 2004
10 *
11 * This file is part of Gecode, the generic constraint
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35
36namespace Gecode { namespace Set { namespace Rel {
37
38 template<class View0, class View1, class CtrlView, ReifyMode rm>
41 View1 y1, CtrlView b0)
42 : Propagator(home), x0(y0), x1(y1), b(b0) {
43 b.subscribe(home,*this, Gecode::Int::PC_INT_VAL);
44 x0.subscribe(home,*this, PC_SET_ANY);
45 x1.subscribe(home,*this, PC_SET_ANY);
46 }
47
48 template<class View0, class View1, class CtrlView, ReifyMode rm>
51 ReSubset& p)
52 : Propagator(home,p) {
53 x0.update(home,p.x0);
54 x1.update(home,p.x1);
55 b.update(home,p.b);
56 }
57
58 template<class View0, class View1, class CtrlView, ReifyMode rm>
64
65 template<class View0, class View1, class CtrlView, ReifyMode rm>
66 void
68 b.reschedule(home,*this, Gecode::Int::PC_INT_VAL);
69 x0.reschedule(home,*this, PC_SET_ANY);
70 x1.reschedule(home,*this, PC_SET_ANY);
71 }
72
73 template<class View0, class View1, class CtrlView, ReifyMode rm>
74 forceinline size_t
76 b.cancel(home,*this, Gecode::Int::PC_INT_VAL);
77 x0.cancel(home,*this, PC_SET_ANY);
78 x1.cancel(home,*this, PC_SET_ANY);
79 (void) Propagator::dispose(home);
80 return sizeof(*this);
81 }
82
83 template<class View0, class View1, class CtrlView, ReifyMode rm>
86 CtrlView b) {
87 if (!same(x0,x1)) {
88 (void) new (home) ReSubset<View0,View1,CtrlView,rm>(home,x0,x1,b);
89 } else if (rm != RM_IMP) {
90 GECODE_ME_CHECK(b.one(home));
91 }
92 return ES_OK;
93 }
94
95 template<class View0, class View1, class CtrlView, ReifyMode rm>
96 Actor*
100
101 template<class View0, class View1, class CtrlView, ReifyMode rm>
104 const ModEventDelta&) {
105 if (b.one()) {
106 if (rm == RM_PMI)
107 return home.ES_SUBSUMED(*this);
108 GECODE_REWRITE(*this,(Subset<View0,View1>::post(home(*this),x0,x1)));
109 }
110 if (b.zero()) {
111 if (rm == RM_IMP)
112 return home.ES_SUBSUMED(*this);
113 GECODE_REWRITE(*this,(NoSubset<View0,View1>::post(home(*this),x0,x1)));
114 }
115
116 // check whether cardinalities still allow subset
117 if (x0.cardMin() > x1.cardMax()) {
118 if (rm != RM_PMI)
119 GECODE_ME_CHECK(b.zero_none(home));
120 return home.ES_SUBSUMED(*this);
121 }
122
123 // check lub(x0) subset glb(x1)
124 {
125 LubRanges<View0> x0ub(x0);
126 GlbRanges<View1> x1lb(x1);
128 if (!d()) {
129 if (rm != RM_IMP)
130 GECODE_ME_CHECK(b.one_none(home));
131 return home.ES_SUBSUMED(*this);
132 }
133 }
134
135 // check glb(x0) subset lub(x1)
136 {
137 GlbRanges<View0> x0lb(x0);
138 LubRanges<View1> x1ub(x1);
140 if (d()) {
141 if (rm != RM_PMI)
142 GECODE_ME_CHECK(b.zero_none(home));
143 return home.ES_SUBSUMED(*this);
144 } else if (x0.assigned() && x1.assigned()) {
145 if (rm != RM_IMP)
146 GECODE_ME_CHECK(b.one_none(home));
147 return home.ES_SUBSUMED(*this);
148 }
149 }
150
151 if (x0.cardMin() > 0) {
152 LubRanges<View0> x0ub(x0);
153 LubRanges<View1> x1ub(x1);
155 i(x0ub,x1ub);
156 if (!i()) {
157 if (rm != RM_PMI)
158 GECODE_ME_CHECK(b.zero_none(home));
159 return home.ES_SUBSUMED(*this);
160 }
161 }
162
163 return ES_FIX;
164 }
165
166}}}
167
168// STATISTICS: set-prop
struct Gecode::@603::NNF::@65::@66 b
For binary nodes (and, or, eqv)
int p
Number of positive literals for node type.
Base-class for both propagators and branchers.
Definition core.hpp:628
virtual size_t dispose(Space &home)
Delete actor and return its size.
Definition core.hpp:3252
Home class for posting propagators
Definition core.hpp:856
Range iterator for computing set difference.
Range iterator for computing intersection (binary)
Propagation cost.
Definition core.hpp:486
static PropCost ternary(PropCost::Mod m)
Three variables for modifier pcm.
Definition core.hpp:4805
Base-class for propagators.
Definition core.hpp:1064
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 the negated subset constraint
Definition rel.hh:91
Reified subset propagator
Definition rel.hh:115
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition re-subset.hpp:75
CtrlView b
Boolean control view.
Definition rel.hh:122
View0 x0
Variable view.
Definition rel.hh:118
ReSubset(Space &home, ReSubset &p)
Constructor for cloning p.
Definition re-subset.hpp:50
virtual void reschedule(Space &home)
Schedule function.
Definition re-subset.hpp:67
View1 x1
Variable view.
Definition rel.hh:120
static ExecStatus post(Home home, View0 x, View1 y, CtrlView b)
Post propagator for .
Definition re-subset.hpp:85
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition re-subset.hpp:97
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function (defined as ternary low)
Definition re-subset.hpp:60
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Propagator for the subset constraint
Definition rel.hh:65
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
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition macros.hpp:116
@ RM_IMP
Implication for reification.
Definition int.hh:862
@ RM_PMI
Inverse implication for reification.
Definition int.hh:869
const Gecode::PropCond PC_INT_VAL
Propagate when a view becomes assigned (single value)
Definition var-type.hpp:82
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
bool same(VarArgArray< Var > x, VarArgArray< Var > y)
Definition array.hpp:1937
ExecStatus
Definition core.hpp:472
@ ES_OK
Execution is okay.
Definition core.hpp:476
@ ES_FIX
Propagation has computed fixpoint.
Definition core.hpp:477
#define forceinline
Definition config.hpp:187