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bool-view.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, 2004
8 *
9 * This file is part of Gecode, the generic constraint
10 * development environment:
11 * http://www.gecode.org
12 *
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33
34namespace Gecode { namespace Int { namespace Linear {
35
36 /*
37 * Base-class
38 *
39 */
40 template<class XV, class YV>
43 ViewArray<XV>& x0, YV y0, int c0)
44 : Propagator(home), x(x0), y(y0), c(c0) {
45 x.subscribe(home,*this,PC_INT_VAL);
46 y.subscribe(home,*this,PC_INT_BND);
47 }
48
49 template<class XV, class YV>
50 forceinline size_t
52 x.cancel(home,*this,PC_INT_VAL);
53 y.cancel(home,*this,PC_INT_BND);
54 (void) Propagator::dispose(home);
55 return sizeof(*this);
56 }
57
58 template<class XV, class YV>
61 : Propagator(home,p), c(p.c) {
62 x.update(home,p.x);
63 y.update(home,p.y);
64 }
65
66 template<class XV, class YV>
69 return PropCost::linear(PropCost::LO, x.size());
70 }
71
72 template<class XV, class YV>
73 void
75 x.reschedule(home,*this,PC_INT_VAL);
76 y.reschedule(home,*this,PC_INT_BND);
77 }
78
79
80 /*
81 * Equality propagator
82 *
83 */
84 template<class XV, class YV>
87 : LinBoolView<XV,YV>(home,x,y,c) {}
88
89 template<class XV, class YV>
92 if (y.assigned())
93 return EqBoolInt<XV>::post(home,x,y.val()+c);
94 int n = x.size();
95 for (int i=n; i--; )
96 if (x[i].one()) {
97 x[i]=x[--n]; c--;
98 } else if (x[i].zero()) {
99 x[i]=x[--n];
100 }
101 x.size(n);
102 GECODE_ME_CHECK(y.lq(home,n-c));
103 GECODE_ME_CHECK(y.gq(home,-c));
104 if (n == 0)
105 return ES_OK;
106 if (y.min()+c == n) {
107 assert(y.assigned());
108 for (int i=0; i<n; i++)
109 GECODE_ME_CHECK(x[i].one_none(home));
110 return ES_OK;
111 }
112 if (y.max()+c == 0) {
113 assert(y.assigned());
114 for (int i=0; i<n; i++)
115 GECODE_ME_CHECK(x[i].zero_none(home));
116 return ES_OK;
117 }
118 (void) new (home) EqBoolView<XV,YV>(home,x,y,c);
119 return ES_OK;
120 }
121
122 template<class XV, class YV>
126
127 template<class XV, class YV>
128 Actor*
130 return new (home) EqBoolView<XV,YV>(home,*this);
131 }
132
133 template<class XV, class YV>
136 int n = x.size();
137 for (int i=n; i--; )
138 if (x[i].one()) {
139 x[i]=x[--n]; c--;
140 } else if (x[i].zero()) {
141 x[i]=x[--n];
142 }
143 x.size(n);
144 GECODE_ME_CHECK(y.lq(home,n-c));
145 GECODE_ME_CHECK(y.gq(home,-c));
146 if (n == 0)
147 return home.ES_SUBSUMED(*this);
148 if (y.min()+c == n) {
149 assert(y.assigned());
150 for (int i=0; i<n; i++)
151 GECODE_ME_CHECK(x[i].one_none(home));
152 return home.ES_SUBSUMED(*this);
153 }
154 if (y.max()+c == 0) {
155 assert(y.assigned());
156 for (int i=0; i<n; i++)
157 GECODE_ME_CHECK(x[i].zero_none(home));
158 return home.ES_SUBSUMED(*this);
159 }
160 if (y.assigned())
161 GECODE_REWRITE(*this,EqBoolInt<XV>::post(home(*this),x,y.val()+c));
162 return ES_FIX;
163 }
164
165
166 /*
167 * Disequality propagator
168 *
169 */
170 template<class XV, class YV>
173 : LinBoolView<XV,YV>(home,x,y,c) {}
174
175 template<class XV, class YV>
178 if (y.assigned())
179 return NqBoolInt<XV>::post(home,x,y.val()+c);
180 int n = x.size();
181 for (int i = n; i--; )
182 if (x[i].one()) {
183 x[i]=x[--n]; c--;
184 } else if (x[i].zero()) {
185 x[i]=x[--n];
186 }
187 x.size(n);
188 if ((n-c < y.min() ) || (-c > y.max()))
189 return ES_OK;
190 if (n == 0) {
191 GECODE_ME_CHECK(y.nq(home,-c));
192 return ES_OK;
193 }
194 if ((n == 1) && y.assigned()) {
195 if (y.val()+c == 1) {
196 GECODE_ME_CHECK(x[0].zero_none(home));
197 } else {
198 assert(y.val()+c == 0);
199 GECODE_ME_CHECK(x[0].one_none(home));
200 }
201 return ES_OK;
202 }
203 (void) new (home) NqBoolView<XV,YV>(home,x,y,c);
204 return ES_OK;
205 }
206
207
208 template<class XV, class YV>
212
213 template<class XV, class YV>
214 Actor*
216 return new (home) NqBoolView<XV,YV>(home,*this);
217 }
218
219 template<class XV, class YV>
222 int n = x.size();
223 for (int i = n; i--; )
224 if (x[i].one()) {
225 x[i]=x[--n]; c--;
226 } else if (x[i].zero()) {
227 x[i]=x[--n];
228 }
229 x.size(n);
230 if ((n-c < y.min() ) || (-c > y.max()))
231 return home.ES_SUBSUMED(*this);
232 if (n == 0) {
233 GECODE_ME_CHECK(y.nq(home,-c));
234 return home.ES_SUBSUMED(*this);
235 }
236 if ((n == 1) && y.assigned()) {
237 if (y.val()+c == 1) {
238 GECODE_ME_CHECK(x[0].zero_none(home));
239 } else {
240 assert(y.val()+c == 0);
241 GECODE_ME_CHECK(x[0].one_none(home));
242 }
243 return home.ES_SUBSUMED(*this);
244 }
245 return ES_FIX;
246 }
247
248
249 /*
250 * Greater or equal propagator
251 *
252 */
253 template<class XV, class YV>
256 : LinBoolView<XV,YV>(home,x,y,c) {}
257
258 template<class XV, class YV>
261 if (y.assigned())
262 return GqBoolInt<XV>::post(home,x,y.val()+c);
263 // Eliminate assigned views
264 int n = x.size();
265 for (int i = n; i--; )
266 if (x[i].one()) {
267 x[i]=x[--n]; c--;
268 } else if (x[i].zero()) {
269 x[i]=x[--n];
270 }
271 x.size(n);
272 GECODE_ME_CHECK(y.lq(home,n-c));
273 if (-c >= y.max())
274 return ES_OK;
275 if (y.min()+c == n) {
276 for (int i = n; i--; )
277 GECODE_ME_CHECK(x[i].one_none(home));
278 return ES_OK;
279 }
280 (void) new (home) GqBoolView<XV,YV>(home,x,y,c);
281 return ES_OK;
282 }
283
284
285 template<class XV, class YV>
289
290 template<class XV, class YV>
291 Actor*
293 return new (home) GqBoolView<XV,YV>(home,*this);
294 }
295
296 template<class XV, class YV>
299 int n = x.size();
300 for (int i = n; i--; )
301 if (x[i].one()) {
302 x[i]=x[--n]; c--;
303 } else if (x[i].zero()) {
304 x[i]=x[--n];
305 }
306 x.size(n);
307 GECODE_ME_CHECK(y.lq(home,n-c));
308 if (-c >= y.max())
309 return home.ES_SUBSUMED(*this);
310 if (y.min()+c == n) {
311 for (int i = n; i--; )
312 GECODE_ME_CHECK(x[i].one_none(home));
313 return home.ES_SUBSUMED(*this);
314 }
315 if (y.assigned())
316 GECODE_REWRITE(*this,GqBoolInt<XV>::post(home(*this),x,y.val()+c));
317 return ES_FIX;
318 }
319
320}}}
321
322// STATISTICS: int-prop
323
int p
Number of positive literals for node type.
int n
Number of negative 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
Propagator for integer equal to Boolean sum (cardinality)
Definition linear.hh:819
static ExecStatus post(Home home, ViewArray< VX > &x, int c)
Post propagator for .
Definition bool-int.hpp:321
Propagator for equality to Boolean sum (cardinality)
Definition linear.hh:1052
EqBoolView(Space &home, EqBoolView &p)
Constructor for cloning p.
static ExecStatus post(Home home, ViewArray< XV > &x, YV y, int c)
Post propagator for .
Definition bool-view.hpp:91
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
virtual Actor * copy(Space &home)
Create copy during cloning.
Propagator for integer less or equal to Boolean sum (cardinality)
Definition linear.hh:851
static ExecStatus post(Home home, ViewArray< VX > &x, int c)
Post propagator for .
Definition bool-int.hpp:198
Propagator for greater or equal to Boolean sum (cardinality)
Definition linear.hh:1104
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
GqBoolView(Space &home, GqBoolView &p)
Constructor for cloning p.
static ExecStatus post(Home home, ViewArray< XV > &x, YV y, int c)
Post propagator for .
virtual Actor * copy(Space &home)
Create copy during cloning.
Base-class for Boolean linear propagators.
Definition linear.hh:1023
LinBoolView(Space &home, LinBoolView &p)
Constructor for cloning p.
Definition bool-view.hpp:60
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition bool-view.hpp:51
virtual void reschedule(Space &home)
Schedule function.
Definition bool-view.hpp:74
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function (defined as low linear)
Definition bool-view.hpp:68
YV y
View to compare number of assigned Boolean views to.
Definition linear.hh:1028
ViewArray< XV > x
Boolean views.
Definition linear.hh:1026
static ExecStatus post(Home home, ViewArray< VX > &b, int c)
Post propagator for .
Definition bool-int.hpp:394
Propagator for disequality to Boolean sum (cardinality)
Definition linear.hh:1078
NqBoolView(Space &home, NqBoolView &p)
Constructor for cloning p.
static ExecStatus post(Home home, ViewArray< XV > &x, YV y, int c)
Post propagator for .
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
virtual Actor * copy(Space &home)
Create copy during cloning.
Propagation cost.
Definition core.hpp:486
static PropCost linear(PropCost::Mod m, unsigned int n)
Linear complexity for modifier pcm and size measure n.
Definition core.hpp:4796
Base-class for propagators.
Definition core.hpp:1064
Computation spaces.
Definition core.hpp:1742
bool assigned(void) const
Test whether view is assigned.
Definition var.hpp:111
View arrays.
Definition array.hpp:253
void update(Space &home, ViewArray< View > &a)
Update array to be a clone of array a.
Definition array.hpp:1328
void subscribe(Space &home, Propagator &p, PropCond pc, bool schedule=true)
Subscribe propagator p with propagation condition pc to variable.
Definition array.hpp:1341
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
const Gecode::PropCond PC_INT_VAL
Propagate when a view becomes assigned (single value)
Definition var-type.hpp:82
const Gecode::PropCond PC_INT_BND
Propagate when minimum or maximum of a view changes.
Definition var-type.hpp:91
Gecode toplevel namespace
Post propagator for SetVar SetOpType SetVar y
Definition set.hh:767
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:767
#define forceinline
Definition config.hpp:187