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bool-eq.hpp
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3 * Main authors:
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7 * Christian Schulte, 2011
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33
34#include <gecode/int/rel.hh>
35#include <gecode/int/bool.hh>
36
37namespace Gecode { namespace Int { namespace NValues {
38
39 template<class VY>
42 : BoolBase<VY>(home,status,x,y) {}
43
44 template<class VY>
47 : BoolBase<VY>(home,p) {}
48
49 template<class VY>
50 Actor*
52 return new (home) EqBool<VY>(home,*this);
53 }
54
55 template<class VY>
56 inline ExecStatus
58 if (x.size() == 0) {
59 GECODE_ME_CHECK(y.eq(home,0));
60 return ES_OK;
61 }
62
63 x.unique();
64
65 if (x.size() == 1) {
66 GECODE_ME_CHECK(y.eq(home,1));
67 return ES_OK;
68 }
69
70 GECODE_ME_CHECK(y.gq(home,1));
71 GECODE_ME_CHECK(y.lq(home,2));
72
73 if (y.max() == 1) {
74 assert(y.assigned());
75 ViewArray<BoolView> xc(home,x);
76 return Bool::NaryEq<BoolView>::post(home,xc);
77 }
78
79 if (y.min() == 2) {
80 assert(y.assigned());
81 ViewArray<BoolView> xc(home,x);
82 return Rel::NaryNq<BoolView>::post(home,xc);
83 }
84
85 int n = x.size();
86 int status = 0;
87 for (int i=n; i--; )
88 if (x[i].zero()) {
89 if (status & VS_ONE) {
90 GECODE_ME_CHECK(y.eq(home,2));
91 return ES_OK;
92 }
93 x[i] = x[--n];
94 status |= VS_ZERO;
95 } else if (x[i].one()) {
96 if (status & VS_ZERO) {
97 GECODE_ME_CHECK(y.eq(home,2));
98 return ES_OK;
99 }
100 x[i] = x[--n];
101 status |= VS_ONE;
102 }
103
104 assert(status != (VS_ZERO | VS_ONE));
105 if (n == 0) {
106 assert(status != 0);
107 GECODE_ME_CHECK(y.eq(home,1));
108 return ES_OK;
109 }
110 x.size(n);
111
112 (void) new (home) EqBool<VY>(home,status,x,y);
113 return ES_OK;
114 }
115
116 template<class VY>
119 if (status == (VS_ZERO | VS_ONE)) {
120 GECODE_ME_CHECK(y.eq(home,2));
121 return home.ES_SUBSUMED(*this);
122 }
123
124 if (c.empty()) {
125 assert(status != 0);
126 GECODE_ME_CHECK(y.eq(home,1));
127 return home.ES_SUBSUMED(*this);
128 }
129
130 if (y.max() == 1) {
131 if (status == VS_ZERO) {
132 // Mark that everything is done
134 for (Advisors<ViewAdvisor<BoolView> > as(c); as(); ++as)
135 GECODE_ME_CHECK(as.advisor().view().zero(home));
136 return home.ES_SUBSUMED(*this);
137 }
138 if (status == VS_ONE) {
139 // Mark that everything is done
141 for (Advisors<ViewAdvisor<BoolView> > as(c); as(); ++as)
142 GECODE_ME_CHECK(as.advisor().view().one(home));
143 return home.ES_SUBSUMED(*this);
144 }
145 }
146
147 if (y.min() == 2) {
149 assert(as());
151 ++as;
152 if (!as()) {
153 // Only a single view is left
154 if (status == VS_ZERO) {
155 GECODE_ME_CHECK(a.view().one(home));
156 } else if (status == VS_ONE) {
157 GECODE_ME_CHECK(a.view().zero(home));
158 } else {
159 return ES_FAILED;
160 }
161 return home.ES_SUBSUMED(*this);
162 }
163 }
164
165 return ES_FIX;
166 }
167
168}}}
169
170// 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
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
EqBool(Home home, int status, ViewArray< BoolView > &x, VY y)
Constructor for posting.
Definition bool-eq.hpp:41
static ExecStatus post(Home home, ViewArray< BoolView > &x, VY y)
Post propagator for .
Definition bool-eq.hpp:57
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition bool-eq.hpp:118
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition bool-eq.hpp:51
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