bool-gq.hpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2011
*
* 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
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#include <gecode/int/rel.hh>
namespace Gecode { namespace Int { namespace NValues {
template<class VY>
forceinline
GqBool<VY>::GqBool(Home home, int status, ViewArray<BoolView>& x, VY y)
: BoolBase<VY>(home,status,x,y) {}
template<class VY>
forceinline
GqBool<VY>::GqBool(Space& home, GqBool<VY>& p)
: BoolBase<VY>(home,p) {}
template<class VY>
Actor*
GqBool<VY>::copy(Space& home) {
return new (home) GqBool<VY>(home,*this);
}
template<class VY>
inline ExecStatus
GqBool<VY>::post(Home home, ViewArray<BoolView>& x, VY y) {
if (x.size() == 0) {
GECODE_ME_CHECK(y.lq(home,0));
return ES_OK;
}
x.unique();
if (x.size() == 1) {
GECODE_ME_CHECK(y.lq(home,1));
return ES_OK;
}
GECODE_ME_CHECK(y.lq(home,2));
if (y.max() <= 1)
return ES_OK;
if (y.min() == 2) {
assert(y.assigned());
ViewArray<BoolView> xc(home,x);
return Rel::NaryNq<BoolView>::post(home,xc);
}
int n = x.size();
int status = 0;
for (int i=n; i--; )
if (x[i].zero()) {
if (status & VS_ONE)
return ES_OK;
x[i] = x[--n];
status |= VS_ZERO;
} else if (x[i].one()) {
if (status & VS_ZERO)
return ES_OK;
x[i] = x[--n];
status |= VS_ONE;
}
assert(status != (VS_ZERO | VS_ONE));
if (n == 0) {
assert(status != 0);
GECODE_ME_CHECK(y.lq(home,1));
return ES_OK;
}
x.size(n);
(void) new (home) GqBool<VY>(home,status,x,y);
return ES_OK;
}
template<class VY>
ExecStatus
GqBool<VY>::propagate(Space& home, const ModEventDelta&) {
if (status == (VS_ZERO | VS_ONE))
return home.ES_SUBSUMED(*this);
if (c.empty()) {
assert(status != 0);
GECODE_ME_CHECK(y.lq(home,1));
return home.ES_SUBSUMED(*this);
}
if (y.max() <= 1)
return home.ES_SUBSUMED(*this);
if (y.min() == 2) {
Advisors<ViewAdvisor<BoolView> > as(c);
assert(as());
ViewAdvisor<BoolView>& a(as.advisor());
++as;
if (!as()) {
// Only a single view is left
if (status == VS_ZERO) {
GECODE_ME_CHECK(a.view().one(home));
} else if (status == VS_ONE) {
GECODE_ME_CHECK(a.view().zero(home));
} else {
return ES_FAILED;
}
return home.ES_SUBSUMED(*this);
}
}
return ES_FIX;
}
}}}
// STATISTICS: int-prop
Gecode::Actor
Base-class for both propagators and branchers.
Definition core.hpp:628
Gecode::Advisors
Class to iterate over advisors of a council.
Definition core.hpp:1266
Gecode::Advisors::advisor
A & advisor(void) const
Return advisor.
Definition core.hpp:4010
Gecode::Home
Home class for posting propagators
Definition core.hpp:856
Gecode::Int::NValues::BoolBase::c
Council< ViewAdvisor< BoolView > > c
The advisor council.
Definition nvalues.hh:302
Gecode::Int::NValues::BoolBase::BoolBase
BoolBase(Home home, int status, ViewArray< BoolView > &x, VY y)
Constructor for posting.
Definition bool-base.hpp:38
Gecode::Int::NValues::BoolBase::VS_ONE
static const int VS_ONE
View status: a one has already been encountered.
Definition nvalues.hh:298
Gecode::Int::NValues::BoolBase::y
VY y
The view for counting the number of values.
Definition nvalues.hh:304
Gecode::Int::NValues::BoolBase::VS_ZERO
static const int VS_ZERO
View status: a zero has already been encountered.
Definition nvalues.hh:296
Gecode::Int::NValues::BoolBase::status
int status
Status information about the views.
Definition nvalues.hh:300
Gecode::Int::NValues::GqBool::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition bool-gq.hpp:109
Gecode::Int::NValues::GqBool::copy
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition bool-gq.hpp:50
Gecode::Int::NValues::GqBool::GqBool
GqBool(Home home, int status, ViewArray< BoolView > &x, VY y)
Constructor for posting.
Definition bool-gq.hpp:40
Gecode::Int::NValues::GqBool::post
static ExecStatus post(Home home, ViewArray< BoolView > &x, VY y)
Post propagator for .
Definition bool-gq.hpp:56
Gecode::Int::Rel::NaryNq::post
static ExecStatus post(Home home, ViewArray< View > &x)
Post propagator .
Definition nq.hpp:118
Gecode::Propagator::Space
friend class Space
Definition core.hpp:1066
Gecode::ViewAdvisor
Advisor storing a single view
Definition advisor.hpp:43
Gecode::ViewArray
View arrays.
Definition array.hpp:253
Gecode::ViewArray::unique
void unique(void)
Remove all duplicate views from array (changes element order).
Definition array.hpp:1417
Gecode::ViewArray::size
int size(void) const
Return size of array (number of elements).
Definition array.hpp:1156
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
rel.hh
Gecode::Int::NValues
Number of values propagators.
Gecode::Int
Finite domain integers.
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
Gecode::ES_FAILED
@ ES_FAILED
Execution has resulted in failure.
Definition core.hpp:474
forceinline
#define forceinline
Definition config.hpp:187