eq.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, 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
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namespace Gecode { namespace Int { namespace Bool {
template<class BVA, class BVB>
forceinline
Eq<BVA,BVB>::Eq(Home home, BVA b0, BVB b1)
: BoolBinary<BVA,BVB>(home,b0,b1) {}
template<class BVA, class BVB>
forceinline
Eq<BVA,BVB>::Eq(Space& home, Eq<BVA,BVB>& p)
: BoolBinary<BVA,BVB>(home,p) {}
template<class BVA, class BVB>
forceinline
Eq<BVA,BVB>::Eq(Space& home, Propagator& p,
BVA b0, BVB b1)
: BoolBinary<BVA,BVB>(home,p,b0,b1) {}
template<class BVA, class BVB>
Actor*
Eq<BVA,BVB>::copy(Space& home) {
return new (home) Eq<BVA,BVB>(home,*this);
}
template<class BVA, class BVB>
inline ExecStatus
Eq<BVA,BVB>::post(Home home, BVA b0, BVB b1) {
switch (bool_test(b0,b1)) {
case BT_SAME: return ES_OK;
case BT_COMP: return ES_FAILED;
case BT_NONE:
if (b0.zero()) {
GECODE_ME_CHECK(b1.zero(home));
} else if (b0.one()) {
GECODE_ME_CHECK(b1.one(home));
} else if (b1.zero()) {
GECODE_ME_CHECK(b0.zero(home));
} else if (b1.one()) {
GECODE_ME_CHECK(b0.one(home));
} else {
(void) new (home) Eq<BVA,BVB>(home,b0,b1);
}
break;
default: GECODE_NEVER;
}
return ES_OK;
}
template<class BVA, class BVB>
ExecStatus
Eq<BVA,BVB>::propagate(Space& home, const ModEventDelta&) {
#define GECODE_INT_STATUS(S0,S1) \
((BVA::S0<<(1*BVA::BITS))|(BVB::S1<<(0*BVB::BITS)))
switch ((x0.status() << (1*BVA::BITS)) | (x1.status() << (0*BVB::BITS))) {
case GECODE_INT_STATUS(NONE,NONE):
GECODE_NEVER;
case GECODE_INT_STATUS(NONE,ZERO):
GECODE_ME_CHECK(x0.zero_none(home)); break;
case GECODE_INT_STATUS(NONE,ONE):
GECODE_ME_CHECK(x0.one_none(home)); break;
case GECODE_INT_STATUS(ZERO,NONE):
GECODE_ME_CHECK(x1.zero_none(home)); break;
case GECODE_INT_STATUS(ZERO,ZERO):
break;
case GECODE_INT_STATUS(ZERO,ONE):
return ES_FAILED;
case GECODE_INT_STATUS(ONE,NONE):
GECODE_ME_CHECK(x1.one_none(home)); break;
case GECODE_INT_STATUS(ONE,ZERO):
return ES_FAILED;
case GECODE_INT_STATUS(ONE,ONE):
break;
default:
GECODE_NEVER;
}
return home.ES_SUBSUMED(*this);
#undef GECODE_INT_STATUS
}
template<class BV>
forceinline
NaryEq<BV>::NaryEq(Home home, ViewArray<BV>& x)
: NaryPropagator<BV,PC_BOOL_VAL>(home,x) {}
template<class BV>
forceinline
NaryEq<BV>::NaryEq(Space& home, NaryEq<BV>& p)
: NaryPropagator<BV,PC_BOOL_VAL>(home,p) {}
template<class BV>
Actor*
NaryEq<BV>::copy(Space& home) {
return new (home) NaryEq<BV>(home,*this);
}
template<class BV>
inline ExecStatus
NaryEq<BV>::post(Home home, ViewArray<BV>& x) {
x.unique();
int n = x.size();
if (n < 2)
return ES_OK;
if (n == 2)
return Eq<BV,BV>::post(home,x[0],x[1]);
for (int i=n; i--; )
if (x[i].assigned()) {
if (x[i].one()) {
for (int j=0; j<i; j++)
GECODE_ME_CHECK(x[j].one(home));
for (int j=i+1; j<n; j++)
GECODE_ME_CHECK(x[j].one_none(home));
} else {
for (int j=0; j<i; j++)
GECODE_ME_CHECK(x[j].zero(home));
for (int j=i+1; j<n; j++)
GECODE_ME_CHECK(x[j].zero_none(home));
}
return ES_OK;
}
(void) new (home) NaryEq<BV>(home,x);
return ES_OK;
}
template<class BV>
PropCost
NaryEq<BV>::cost(const Space&, const ModEventDelta&) const {
return PropCost::unary(PropCost::LO);
}
template<class BV>
ExecStatus
NaryEq<BV>::propagate(Space& home, const ModEventDelta&) {
int n=x.size();
int i=0;
while (true) {
if (x[i].assigned()) {
if (x[i].one()) {
for (int j=0; j<i; j++)
GECODE_ME_CHECK(x[j].one_none(home));
for (int j=i+1; j<n; j++)
GECODE_ME_CHECK(x[j].one(home));
} else {
for (int j=0; j<i; j++)
GECODE_ME_CHECK(x[j].zero_none(home));
for (int j=i+1; j<n; j++)
GECODE_ME_CHECK(x[j].zero(home));
}
return home.ES_SUBSUMED(*this);
}
i++;
}
GECODE_NEVER;
return ES_FIX;
}
}}}
// STATISTICS: int-prop
Gecode::Actor
Base-class for both propagators and branchers.
Definition core.hpp:628
Gecode::Home
Home class for posting propagators
Definition core.hpp:856
Gecode::Int::Bool::BoolBinary::x1
BVB x1
Boolean view Constructor for posting.
Definition bool.hh:58
Gecode::Int::Bool::BoolBinary::BoolBinary
BoolBinary(Home home, BVA b0, BVB b1)
Definition base.hpp:42
Gecode::Int::Bool::BoolBinary::x0
BVA x0
Boolean view.
Definition bool.hh:57
Gecode::Int::Bool::Eq::post
static ExecStatus post(Home home, BVA x0, BVB x1)
Post propagator .
Definition eq.hpp:60
Gecode::Int::Bool::Eq::Eq
Eq(Home home, BVA b0, BVB b1)
Constructor for posting.
Definition eq.hpp:38
Gecode::Int::Bool::Eq::copy
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition eq.hpp:54
Gecode::Int::Bool::Eq::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition eq.hpp:84
Gecode::Int::Bool::NaryEq::post
static ExecStatus post(Home home, ViewArray< BV > &x)
Post propagator .
Definition eq.hpp:131
Gecode::Int::Bool::NaryEq::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition eq.hpp:165
Gecode::Int::Bool::NaryEq::NaryEq
NaryEq(Home home, ViewArray< BV > &x)
Constructor for posting.
Definition eq.hpp:115
Gecode::Int::Bool::NaryEq::cost
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function (defined as low unary).
Definition eq.hpp:159
Gecode::Int::Bool::NaryEq::copy
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition eq.hpp:125
Gecode::NaryPropagator< BV, PC_BOOL_VAL >::x
ViewArray< BV > x
Definition pattern.hpp:145
Gecode::NaryPropagator< BV, PC_BOOL_VAL >::NaryPropagator
NaryPropagator(Space &home, NaryPropagator &p)
Gecode::PropCost
Propagation cost.
Definition core.hpp:486
Gecode::PropCost::unary
static PropCost unary(PropCost::Mod m)
Single variable for modifier pcm.
Definition core.hpp:4813
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_INT_STATUS
#define GECODE_INT_STATUS(S0, S1)
Gecode::Int::Bool
Boolean propagators.
Gecode::Int
Finite domain integers.
Gecode::Int::PC_BOOL_VAL
const Gecode::PropCond PC_BOOL_VAL
Propagate when a view becomes assigned (single value).
Definition var-type.hpp:126
Gecode::Int::bool_test
BoolTest bool_test(const BoolView &b0, const BoolView &b1)
Definition bool-test.hpp:41
Gecode::Int::BT_NONE
@ BT_NONE
No sharing.
Definition view.hpp:1785
Gecode::Int::BT_COMP
@ BT_COMP
Same variable but complement.
Definition view.hpp:1787
Gecode::Int::BT_SAME
@ BT_SAME
Same variable.
Definition view.hpp:1786
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
GECODE_NEVER
#define GECODE_NEVER
Assert that this command is never executed.
Definition macros.hpp:56