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bool-gq.hpp
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1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Christian Schulte <schulte@gecode.org>
5 *
6 * Copyright:
7 * Christian Schulte, 2011
8 *
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33
34#include <gecode/int/rel.hh>
35
36namespace Gecode { namespace Int { namespace NValues {
37
38 template<class VY>
41 : BoolBase<VY>(home,status,x,y) {}
42
43 template<class VY>
46 : BoolBase<VY>(home,p) {}
47
48 template<class VY>
49 Actor*
51 return new (home) GqBool<VY>(home,*this);
52 }
53
54 template<class VY>
55 inline ExecStatus
57 if (x.size() == 0) {
58 GECODE_ME_CHECK(y.lq(home,0));
59 return ES_OK;
60 }
61
62 x.unique();
63
64 if (x.size() == 1) {
65 GECODE_ME_CHECK(y.lq(home,1));
66 return ES_OK;
67 }
68
69 GECODE_ME_CHECK(y.lq(home,2));
70
71 if (y.max() <= 1)
72 return ES_OK;
73
74 if (y.min() == 2) {
75 assert(y.assigned());
76 ViewArray<BoolView> xc(home,x);
77 return Rel::NaryNq<BoolView>::post(home,xc);
78 }
79
80 int n = x.size();
81 int status = 0;
82 for (int i=n; i--; )
83 if (x[i].zero()) {
84 if (status & VS_ONE)
85 return ES_OK;
86 x[i] = x[--n];
87 status |= VS_ZERO;
88 } else if (x[i].one()) {
89 if (status & VS_ZERO)
90 return ES_OK;
91 x[i] = x[--n];
92 status |= VS_ONE;
93 }
94
95 assert(status != (VS_ZERO | VS_ONE));
96 if (n == 0) {
97 assert(status != 0);
98 GECODE_ME_CHECK(y.lq(home,1));
99 return ES_OK;
100 }
101 x.size(n);
102
103 (void) new (home) GqBool<VY>(home,status,x,y);
104 return ES_OK;
105 }
106
107 template<class VY>
110 if (status == (VS_ZERO | VS_ONE))
111 return home.ES_SUBSUMED(*this);
112
113 if (c.empty()) {
114 assert(status != 0);
115 GECODE_ME_CHECK(y.lq(home,1));
116 return home.ES_SUBSUMED(*this);
117 }
118
119 if (y.max() <= 1)
120 return home.ES_SUBSUMED(*this);
121
122 if (y.min() == 2) {
124 assert(as());
126 ++as;
127 if (!as()) {
128 // Only a single view is left
129 if (status == VS_ZERO) {
130 GECODE_ME_CHECK(a.view().one(home));
131 } else if (status == VS_ONE) {
132 GECODE_ME_CHECK(a.view().zero(home));
133 } else {
134 return ES_FAILED;
135 }
136 return home.ES_SUBSUMED(*this);
137 }
138 }
139
140 return ES_FIX;
141 }
142
143}}}
144
145// STATISTICS: int-prop
Base-class for both propagators and branchers.
Definition core.hpp:628
Class to iterate over advisors of a council.
Definition core.hpp:1268
A & advisor(void) const
Return advisor.
Definition core.hpp:4017
Home class for posting propagators
Definition core.hpp:856
Council< ViewAdvisor< BoolView > > c
The advisor council.
Definition nvalues.hh:302
BoolBase(Home home, int status, ViewArray< BoolView > &x, VY y)
Constructor for posting.
Definition bool-base.hpp:38
static const int VS_ONE
View status: a one has already been encountered.
Definition nvalues.hh:298
VY y
The view for counting the number of values.
Definition nvalues.hh:304
static const int VS_ZERO
View status: a zero has already been encountered.
Definition nvalues.hh:296
int status
Status information about the views.
Definition nvalues.hh:300
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition bool-gq.hpp:109
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition bool-gq.hpp:50
GqBool(Home home, int status, ViewArray< BoolView > &x, VY y)
Constructor for posting.
Definition bool-gq.hpp:40
static ExecStatus post(Home home, ViewArray< BoolView > &x, VY y)
Post propagator for .
Definition bool-gq.hpp:56
static ExecStatus post(Home home, ViewArray< View > &x)
Post propagator .
Definition nq.hpp:118
friend class Space
Definition core.hpp:1068
Advisor storing a single view
Definition advisor.hpp:43
View arrays.
Definition array.hpp:253
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
Number of values propagators.
Finite domain integers.
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_FAILED
Execution has resulted in failure.
Definition core.hpp:474
Post propagator for SetVar x
Definition set.hh:773
#define forceinline
Definition config.hpp:194