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seq-u.cpp
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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
20 * a copy of this software and associated documentation files (the
21 * "Software"), to deal in the Software without restriction, including
22 * without limitation the rights to use, copy, modify, merge, publish,
23 * distribute, sublicense, and/or sell copies of the Software, and to
24 * permit persons to whom the Software is furnished to do so, subject to
25 * the following conditions:
26 *
27 * The above copyright notice and this permission notice shall be
28 * included in all copies or substantial portions of the Software.
29 *
30 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
31 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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38 */
39
41
42namespace Gecode { namespace Set { namespace Sequence {
43
44 /*
45 * "Sequenced union" propagator
46 *
47 */
48
49 Actor*
50 SeqU::copy(Space& home) {
51 return new (home) SeqU(home,*this);
52 }
53
55 SeqU::propagateSeqUnion(Space& home,
56 bool& modified, ViewArray<SetView>& x,
57 SetView& y) {
58 Region r;
59 GlbRanges<SetView>* XLBs = r.alloc<GlbRanges<SetView> >(x.size());
60 for (int i=x.size(); i--; ) {
61 GlbRanges<SetView> lb(x[i]);
62 XLBs[i]=lb;
63 }
65 GECODE_ME_CHECK_MODIFIED(modified, y.includeI(home,u));
66
67 GLBndSet before(home);
68 for (int i=0; i<x.size(); i++) {
69 LubRanges<SetView> xiub(x[i]);
70 before.includeI(home, xiub);
71 BndSetRanges beforeR(before);
74 if (diff()) {
75 GECODE_ME_CHECK_MODIFIED(modified, x[i].exclude(home, diff.min(),
77 }
78 }
79 before.dispose(home);
80
81 GLBndSet after(home);
82 for (int i=x.size(); i--; ) {
83 LubRanges<SetView> xiub(x[i]);
84 after.includeI(home, xiub);
85 BndSetRanges afterR(after);
88 if (diff()) {
89 int max = diff.max();
90 for (; diff(); ++diff)
91 max = diff.max();
92 GECODE_ME_CHECK_MODIFIED(modified, x[i].exclude(home,
94 max));
95 }
96 }
97 after.dispose(home);
98
99 return ES_FIX;
100 }
101
102 //Enforces sequentiality and ensures y contains union of Xi lower bounds.
104 SeqU::propagate(Space& home, const ModEventDelta& med) {
105 ModEvent me0 = SetView::me(med);
106 bool ubevent = Rel::testSetEventUB(me0);
107 bool anybevent = Rel::testSetEventAnyB(me0);
108 bool cardevent = Rel::testSetEventCard(me0);
109
110 bool modified = false;
111 bool assigned=false;
112 bool oldModified = false;
113
114 do {
115 oldModified = modified;
116 modified = false;
117
118 if (oldModified || modified || anybevent || cardevent)
119 GECODE_ES_CHECK(propagateSeq(home,modified,assigned,x));
120 if (oldModified || modified || anybevent)
121 GECODE_ES_CHECK(propagateSeqUnion(home,modified,x,y));
122 if (oldModified || modified || ubevent)
124 if (oldModified || modified || ubevent)
126 if (oldModified || modified || anybevent)
128 if (oldModified || modified || cardevent || ubevent)
130
131 } while (modified);
132
133 for (int i=x.size(); i--;)
134 if (!x[i].assigned())
135 return ES_FIX;
136 return home.ES_SUBSUMED(*this);
137 }
138
139}}}
140
141// STATISTICS: set-prop
union Gecode::@603::NNF::@65 u
Union depending on nodetype t.
Range iterator for computing set difference.
Definition: ranges-diff.hpp:43
int min(void) const
Return smallest value of range.
int max(void) const
Return largest value of range.
Range iterator for appending arbitrarily many iterators.
ViewArray< SetView > x
Array of views.
Definition: pattern.hpp:175
ModEventDelta med
A set of modification events (used during propagation)
Definition: core.hpp:1075
Handle to region.
Definition: region.hpp:55
Range iterator for integer sets.
Definition: var-imp.hpp:185
void dispose(Space &home)
Free memory used by this set.
Definition: integerset.hpp:60
Growing sets of integers.
Definition: var-imp.hpp:205
bool includeI(Space &home, I &i)
Include the set represented by i in this set.
Definition: integerset.hpp:296
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 sequenced union constraint
Definition: sequence.hh:81
ExecStatus propagateSeqUnion(Space &home, bool &modified, ViewArray< SetView > &x, SetView &y)
Definition: seq-u.cpp:55
Set view for set variables
Definition: view.hpp:56
ModEvent includeI(Space &home, I &i)
Include range sequence described by i in greatest lower bound.
Definition: set.hpp:151
Computation spaces.
Definition: core.hpp:1742
static ModEvent me(const ModEventDelta &med)
Return modification event for view type in med.
Definition: view.hpp:552
View arrays.
Definition: array.hpp:253
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1156
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3563
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:91
#define GECODE_ME_CHECK_MODIFIED(modified, me)
Check whether me is failed or modified, and forward failure.
Definition: macros.hpp:64
const int min
Smallest allowed integer in integer set.
Definition: set.hh:99
const int max
Largest allowed integer in integer set.
Definition: set.hh:97
ExecStatus partitionNCard(Space &home, bool &modified, ViewArray< View0 > &x, View1 &y, GLBndSet &unionOfDets)
Definition: common.hpp:308
ExecStatus unionNXiUB(Space &home, bool &modified, ViewArray< View0 > &x, View1 &y, GLBndSet &)
Definition: common.hpp:294
ExecStatus partitionNXiLB(Space &home, bool &modified, ViewArray< View0 > &x, View1 &y, GLBndSet &unionOfDets)
Definition: common.hpp:513
ExecStatus partitionNYUB(Space &home, bool &modified, ViewArray< View0 > &x, View1 &y, GLBndSet &unionOfDets)
Definition: common.hpp:587
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
ExecStatus propagateSeq(Space &home, bool &modified, bool &assigned, ViewArray< SetView > &x)
Definition: common.hpp:43
Gecode toplevel namespace
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition: set.hh:767
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
ExecStatus
Definition: core.hpp:472
@ ES_FIX
Propagation has computed fixpoint.
Definition: core.hpp:477
void max(Home home, FloatVar x0, FloatVar x1, FloatVar x2)
Post propagator for .
Definition: arithmetic.cpp:49
Post propagator for SetVar x
Definition: set.hh:767
int ModEvent
Type for modification events.
Definition: core.hpp:62