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bool-lq.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
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33
34#include <gecode/int/bool.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) LqBool<VY>(home,*this);
52 }
53
54 template<class VY>
55 inline ExecStatus
57 if (x.size() == 0) {
58 GECODE_ME_CHECK(y.gq(home,0));
59 return ES_OK;
60 }
61
62 x.unique();
63
64 GECODE_ME_CHECK(y.gq(home,1));
65
66 if (x.size() == 1)
67 return ES_OK;
68
69 if (y.max() == 1) {
70 assert(y.assigned());
71 ViewArray<BoolView> xc(home,x);
72 return Bool::NaryEq<BoolView>::post(home,xc);
73 }
74
75 if (y.min() >= 2)
76 return ES_OK;
77
78 int n = x.size();
79 int status = 0;
80 for (int i=n; i--; )
81 if (x[i].zero()) {
82 if (status & VS_ONE) {
83 GECODE_ME_CHECK(y.gq(home,2));
84 return ES_OK;
85 }
86 x[i] = x[--n];
87 status |= VS_ZERO;
88 } else if (x[i].one()) {
89 if (status & VS_ZERO) {
90 GECODE_ME_CHECK(y.gq(home,2));
91 return ES_OK;
92 }
93 x[i] = x[--n];
94 status |= VS_ONE;
95 }
96
97 assert(status != (VS_ZERO | VS_ONE));
98 if (n == 0) {
99 assert((status != 0) && (y.min() >= 1));
100 return ES_OK;
101 }
102
103 x.size(n);
104
105 (void) new (home) LqBool<VY>(home,status,x,y);
106 return ES_OK;
107 }
108
109 template<class VY>
112 if (status == (VS_ZERO | VS_ONE)) {
113 GECODE_ME_CHECK(y.gq(home,2));
114 return home.ES_SUBSUMED(*this);
115 }
116
117 if (c.empty()) {
118 assert((status != 0) && (y.min() >= 1));
119 return home.ES_SUBSUMED(*this);
120 }
121
122 if (y.max() == 1) {
123 if (status == VS_ZERO) {
124 // Mark that everything is done
126 for (Advisors<ViewAdvisor<BoolView> > as(c); as(); ++as)
127 GECODE_ME_CHECK(as.advisor().view().zero(home));
128 return home.ES_SUBSUMED(*this);
129 }
130 if (status == VS_ONE) {
131 // Mark that everything is done
133 for (Advisors<ViewAdvisor<BoolView> > as(c); as(); ++as)
134 GECODE_ME_CHECK(as.advisor().view().one(home));
135 return home.ES_SUBSUMED(*this);
136 }
137 }
138
139 if (y.min() == 2)
140 return home.ES_SUBSUMED(*this);
141
142 return ES_FIX;
143 }
144
145}}}
146
147// 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
Home class for posting propagators
Definition core.hpp:856
static ExecStatus post(Home home, ViewArray< BV > &x)
Post propagator .
Definition eq.hpp:131
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 Actor * copy(Space &home)
Copy propagator during cloning.
Definition bool-lq.hpp:50
LqBool(Home home, int status, ViewArray< BoolView > &x, VY y)
Constructor for posting.
Definition bool-lq.hpp:40
static ExecStatus post(Home home, ViewArray< BoolView > &x, VY y)
Post propagator for .
Definition bool-lq.hpp:56
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition bool-lq.hpp:111
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
Post propagator for SetVar x
Definition set.hh:773
#define forceinline
Definition config.hpp:194