bool-view.hpp
Go to the documentation of this file.
/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2004
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
namespace Gecode { namespace Int { namespace Linear {
/*
* Base-class
*
*/
template<class XV, class YV>
forceinline
LinBoolView<XV,YV>::LinBoolView(Home home,
ViewArray<XV>& x0, YV y0, int c0)
: Propagator(home), x(x0), y(y0), c(c0) {
x.subscribe(home,*this,PC_INT_VAL);
y.subscribe(home,*this,PC_INT_BND);
}
template<class XV, class YV>
forceinline size_t
LinBoolView<XV,YV>::dispose(Space& home) {
x.cancel(home,*this,PC_INT_VAL);
y.cancel(home,*this,PC_INT_BND);
(void) Propagator::dispose(home);
return sizeof(*this);
}
template<class XV, class YV>
forceinline
LinBoolView<XV,YV>::LinBoolView(Space& home, LinBoolView& p)
: Propagator(home,p), c(p.c) {
x.update(home,p.x);
y.update(home,p.y);
}
template<class XV, class YV>
PropCost
LinBoolView<XV,YV>::cost(const Space&, const ModEventDelta&) const {
return PropCost::linear(PropCost::LO, x.size());
}
template<class XV, class YV>
void
LinBoolView<XV,YV>::reschedule(Space& home) {
x.reschedule(home,*this,PC_INT_VAL);
y.reschedule(home,*this,PC_INT_BND);
}
/*
* Equality propagator
*
*/
template<class XV, class YV>
forceinline
EqBoolView<XV,YV>::EqBoolView(Home home, ViewArray<XV>& x, YV y, int c)
: LinBoolView<XV,YV>(home,x,y,c) {}
template<class XV, class YV>
ExecStatus
EqBoolView<XV,YV>::post(Home home, ViewArray<XV>& x, YV y, int c) {
if (y.assigned())
return EqBoolInt<XV>::post(home,x,y.val()+c);
int n = x.size();
for (int i=n; i--; )
if (x[i].one()) {
x[i]=x[--n]; c--;
} else if (x[i].zero()) {
x[i]=x[--n];
}
x.size(n);
GECODE_ME_CHECK(y.lq(home,n-c));
GECODE_ME_CHECK(y.gq(home,-c));
if (n == 0)
return ES_OK;
if (y.min()+c == n) {
assert(y.assigned());
for (int i=0; i<n; i++)
GECODE_ME_CHECK(x[i].one_none(home));
return ES_OK;
}
if (y.max()+c == 0) {
assert(y.assigned());
for (int i=0; i<n; i++)
GECODE_ME_CHECK(x[i].zero_none(home));
return ES_OK;
}
(void) new (home) EqBoolView<XV,YV>(home,x,y,c);
return ES_OK;
}
template<class XV, class YV>
forceinline
EqBoolView<XV,YV>::EqBoolView(Space& home, EqBoolView<XV,YV>& p)
: LinBoolView<XV,YV>(home,p) {}
template<class XV, class YV>
Actor*
EqBoolView<XV,YV>::copy(Space& home) {
return new (home) EqBoolView<XV,YV>(home,*this);
}
template<class XV, class YV>
ExecStatus
EqBoolView<XV,YV>::propagate(Space& home, const ModEventDelta&) {
int n = x.size();
for (int i=n; i--; )
if (x[i].one()) {
x[i]=x[--n]; c--;
} else if (x[i].zero()) {
x[i]=x[--n];
}
x.size(n);
GECODE_ME_CHECK(y.lq(home,n-c));
GECODE_ME_CHECK(y.gq(home,-c));
if (n == 0)
return home.ES_SUBSUMED(*this);
if (y.min()+c == n) {
assert(y.assigned());
for (int i=0; i<n; i++)
GECODE_ME_CHECK(x[i].one_none(home));
return home.ES_SUBSUMED(*this);
}
if (y.max()+c == 0) {
assert(y.assigned());
for (int i=0; i<n; i++)
GECODE_ME_CHECK(x[i].zero_none(home));
return home.ES_SUBSUMED(*this);
}
if (y.assigned())
GECODE_REWRITE(*this,EqBoolInt<XV>::post(home(*this),x,y.val()+c));
return ES_FIX;
}
/*
* Disequality propagator
*
*/
template<class XV, class YV>
forceinline
NqBoolView<XV,YV>::NqBoolView(Home home, ViewArray<XV>& x, YV y, int c)
: LinBoolView<XV,YV>(home,x,y,c) {}
template<class XV, class YV>
ExecStatus
NqBoolView<XV,YV>::post(Home home, ViewArray<XV>& x, YV y, int c) {
if (y.assigned())
return NqBoolInt<XV>::post(home,x,y.val()+c);
int n = x.size();
for (int i = n; i--; )
if (x[i].one()) {
x[i]=x[--n]; c--;
} else if (x[i].zero()) {
x[i]=x[--n];
}
x.size(n);
if ((n-c < y.min() ) || (-c > y.max()))
return ES_OK;
if (n == 0) {
GECODE_ME_CHECK(y.nq(home,-c));
return ES_OK;
}
if ((n == 1) && y.assigned()) {
if (y.val()+c == 1) {
GECODE_ME_CHECK(x[0].zero_none(home));
} else {
assert(y.val()+c == 0);
GECODE_ME_CHECK(x[0].one_none(home));
}
return ES_OK;
}
(void) new (home) NqBoolView<XV,YV>(home,x,y,c);
return ES_OK;
}
template<class XV, class YV>
forceinline
NqBoolView<XV,YV>::NqBoolView(Space& home, NqBoolView<XV,YV>& p)
: LinBoolView<XV,YV>(home,p) {}
template<class XV, class YV>
Actor*
NqBoolView<XV,YV>::copy(Space& home) {
return new (home) NqBoolView<XV,YV>(home,*this);
}
template<class XV, class YV>
ExecStatus
NqBoolView<XV,YV>::propagate(Space& home, const ModEventDelta&) {
int n = x.size();
for (int i = n; i--; )
if (x[i].one()) {
x[i]=x[--n]; c--;
} else if (x[i].zero()) {
x[i]=x[--n];
}
x.size(n);
if ((n-c < y.min() ) || (-c > y.max()))
return home.ES_SUBSUMED(*this);
if (n == 0) {
GECODE_ME_CHECK(y.nq(home,-c));
return home.ES_SUBSUMED(*this);
}
if ((n == 1) && y.assigned()) {
if (y.val()+c == 1) {
GECODE_ME_CHECK(x[0].zero_none(home));
} else {
assert(y.val()+c == 0);
GECODE_ME_CHECK(x[0].one_none(home));
}
return home.ES_SUBSUMED(*this);
}
return ES_FIX;
}
/*
* Greater or equal propagator
*
*/
template<class XV, class YV>
forceinline
GqBoolView<XV,YV>::GqBoolView(Home home, ViewArray<XV>& x, YV y, int c)
: LinBoolView<XV,YV>(home,x,y,c) {}
template<class XV, class YV>
ExecStatus
GqBoolView<XV,YV>::post(Home home, ViewArray<XV>& x, YV y, int c) {
if (y.assigned())
return GqBoolInt<XV>::post(home,x,y.val()+c);
// Eliminate assigned views
int n = x.size();
for (int i = n; i--; )
if (x[i].one()) {
x[i]=x[--n]; c--;
} else if (x[i].zero()) {
x[i]=x[--n];
}
x.size(n);
GECODE_ME_CHECK(y.lq(home,n-c));
if (-c >= y.max())
return ES_OK;
if (y.min()+c == n) {
for (int i = n; i--; )
GECODE_ME_CHECK(x[i].one_none(home));
return ES_OK;
}
(void) new (home) GqBoolView<XV,YV>(home,x,y,c);
return ES_OK;
}
template<class XV, class YV>
forceinline
GqBoolView<XV,YV>::GqBoolView(Space& home, GqBoolView<XV,YV>& p)
: LinBoolView<XV,YV>(home,p) {}
template<class XV, class YV>
Actor*
GqBoolView<XV,YV>::copy(Space& home) {
return new (home) GqBoolView<XV,YV>(home,*this);
}
template<class XV, class YV>
ExecStatus
GqBoolView<XV,YV>::propagate(Space& home, const ModEventDelta&) {
int n = x.size();
for (int i = n; i--; )
if (x[i].one()) {
x[i]=x[--n]; c--;
} else if (x[i].zero()) {
x[i]=x[--n];
}
x.size(n);
GECODE_ME_CHECK(y.lq(home,n-c));
if (-c >= y.max())
return home.ES_SUBSUMED(*this);
if (y.min()+c == n) {
for (int i = n; i--; )
GECODE_ME_CHECK(x[i].one_none(home));
return home.ES_SUBSUMED(*this);
}
if (y.assigned())
GECODE_REWRITE(*this,GqBoolInt<XV>::post(home(*this),x,y.val()+c));
return ES_FIX;
}
}}}
// STATISTICS: int-prop
Gecode::Actor
Base-class for both propagators and branchers.
Definition core.hpp:628
Gecode::Actor::dispose
virtual size_t dispose(Space &home)
Delete actor and return its size.
Definition core.hpp:3252
Gecode::Home
Home class for posting propagators
Definition core.hpp:856
Gecode::Int::Linear::EqBoolInt::post
static ExecStatus post(Home home, ViewArray< VX > &x, int c)
Post propagator for .
Definition bool-int.hpp:321
Gecode::Int::Linear::EqBoolView::EqBoolView
EqBoolView(Space &home, EqBoolView &p)
Constructor for cloning p.
Definition bool-view.hpp:124
Gecode::Int::Linear::EqBoolView::post
static ExecStatus post(Home home, ViewArray< XV > &x, YV y, int c)
Post propagator for .
Definition bool-view.hpp:91
Gecode::Int::Linear::EqBoolView::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition bool-view.hpp:135
Gecode::Int::Linear::EqBoolView::copy
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition bool-view.hpp:129
Gecode::Int::Linear::GqBoolInt::post
static ExecStatus post(Home home, ViewArray< VX > &x, int c)
Post propagator for .
Definition bool-int.hpp:198
Gecode::Int::Linear::GqBoolView::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition bool-view.hpp:298
Gecode::Int::Linear::GqBoolView::GqBoolView
GqBoolView(Space &home, GqBoolView &p)
Constructor for cloning p.
Definition bool-view.hpp:287
Gecode::Int::Linear::GqBoolView::post
static ExecStatus post(Home home, ViewArray< XV > &x, YV y, int c)
Post propagator for .
Definition bool-view.hpp:260
Gecode::Int::Linear::GqBoolView::copy
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition bool-view.hpp:292
Gecode::Int::Linear::LinBoolView::LinBoolView
LinBoolView(Space &home, LinBoolView &p)
Constructor for cloning p.
Definition bool-view.hpp:60
Gecode::Int::Linear::LinBoolView::dispose
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition bool-view.hpp:51
Gecode::Int::Linear::LinBoolView::reschedule
virtual void reschedule(Space &home)
Schedule function.
Definition bool-view.hpp:74
Gecode::Int::Linear::LinBoolView::cost
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function (defined as low linear).
Definition bool-view.hpp:68
Gecode::Int::Linear::LinBoolView::y
YV y
View to compare number of assigned Boolean views to.
Definition linear.hh:1028
Gecode::Int::Linear::LinBoolView::x
ViewArray< XV > x
Boolean views.
Definition linear.hh:1026
Gecode::Int::Linear::LinBoolView::c
int c
Righthandside (constant part from Boolean views assigned to 1).
Definition linear.hh:1030
Gecode::Int::Linear::NqBoolInt::post
static ExecStatus post(Home home, ViewArray< VX > &b, int c)
Post propagator for .
Definition bool-int.hpp:394
Gecode::Int::Linear::NqBoolView::NqBoolView
NqBoolView(Space &home, NqBoolView &p)
Constructor for cloning p.
Definition bool-view.hpp:210
Gecode::Int::Linear::NqBoolView::post
static ExecStatus post(Home home, ViewArray< XV > &x, YV y, int c)
Post propagator for .
Definition bool-view.hpp:177
Gecode::Int::Linear::NqBoolView::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition bool-view.hpp:221
Gecode::Int::Linear::NqBoolView::copy
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition bool-view.hpp:215
Gecode::PropCost
Propagation cost.
Definition core.hpp:486
Gecode::PropCost::linear
static PropCost linear(PropCost::Mod m, unsigned int n)
Linear complexity for modifier pcm and size measure n.
Definition core.hpp:4796
Gecode::PropCost::LO
@ LO
Cheap.
Definition core.hpp:513
Gecode::Propagator::Space
friend class Space
Definition core.hpp:1066
Gecode::Propagator::Propagator
Propagator(Home home)
Constructor for posting.
Definition core.hpp:3498
Gecode::ViewArray
View arrays.
Definition array.hpp:253
Gecode::Space::ES_SUBSUMED
ExecStatus ES_SUBSUMED(Propagator &p)
Definition core.hpp:3563
Gecode::ModEventDelta
int ModEventDelta
Modification event deltas.
Definition core.hpp:89
GECODE_ME_CHECK
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition macros.hpp:52
GECODE_REWRITE
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition macros.hpp:116
Gecode::Int::Linear
Linear propagators
Gecode::Int
Finite domain integers.
Gecode::Int::PC_INT_VAL
const Gecode::PropCond PC_INT_VAL
Propagate when a view becomes assigned (single value).
Definition var-type.hpp:82
Gecode::Int::PC_INT_BND
const Gecode::PropCond PC_INT_BND
Propagate when minimum or maximum of a view changes.
Definition var-type.hpp:91
Gecode
Gecode toplevel namespace
Gecode::ExecStatus
ExecStatus
Definition core.hpp:472
Gecode::ES_OK
@ ES_OK
Execution is okay.
Definition core.hpp:476
Gecode::ES_FIX
@ ES_FIX
Propagation has computed fixpoint.
Definition core.hpp:477
forceinline
#define forceinline
Definition config.hpp:187