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gecode
set
rel
re-eq.hpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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/*
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* Main authors:
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* Guido Tack <tack@gecode.org>
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* Christian Schulte <schulte@gecode.org>
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*
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* Bugfixes provided by:
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* Grégoire Dooms <dooms@info.ucl.ac.be>
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*
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* Copyright:
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* Guido Tack, 2004
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* Christian Schulte, 2004
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*
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* This file is part of Gecode, the generic constraint
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* development environment:
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* http://www.gecode.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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namespace
Gecode
{
namespace
Set {
namespace
Rel {
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template
<
class
View0,
class
View1,
class
CtrlView, ReifyMode rm>
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forceinline
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ReEq<View0,View1,CtrlView,rm>::ReEq
(
Home
home, View0 y0, View1 y1,
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CtrlView y2)
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:
Propagator
(home), x0(y0), x1(y1),
b
(y2) {
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b
.subscribe(home,*
this
,
Gecode::Int::PC_INT_VAL
);
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x0
.subscribe(home,*
this
,
PC_SET_ANY
);
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x1
.subscribe(home,*
this
,
PC_SET_ANY
);
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}
50
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template
<
class
View0,
class
View1,
class
CtrlView, ReifyMode rm>
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forceinline
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ReEq<View0,View1,CtrlView,rm>::ReEq
(
Space
& home,
ReEq
&
p
)
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:
Propagator
(home,
p
) {
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x0
.update(home,
p
.x0);
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x1
.update(home,
p
.x1);
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b
.update(home,
p
.b);
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}
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template
<
class
View0,
class
View1,
class
CtrlView, ReifyMode rm>
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PropCost
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ReEq<View0,View1,CtrlView,rm>::cost
(
const
Space
&,
const
ModEventDelta
&)
const
{
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return
PropCost::ternary
(
PropCost::LO
);
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}
65
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template
<
class
View0,
class
View1,
class
CtrlView, ReifyMode rm>
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void
68
ReEq<View0,View1,CtrlView,rm>::reschedule
(
Space
& home) {
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b
.reschedule(home,*
this
,
Gecode::Int::PC_INT_VAL
);
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x0.reschedule(home,*
this
,
PC_SET_ANY
);
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x1.reschedule(home,*
this
,
PC_SET_ANY
);
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}
73
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template
<
class
View0,
class
View1,
class
CtrlView, ReifyMode rm>
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forceinline
size_t
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ReEq<View0,View1,CtrlView,rm>::dispose
(
Space
& home) {
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b
.cancel(home,*
this
,
Gecode::Int::PC_INT_VAL
);
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x0.cancel(home,*
this
,
PC_SET_ANY
);
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x1.cancel(home,*
this
,
PC_SET_ANY
);
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(void)
Propagator::dispose
(home);
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return
sizeof
(*this);
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}
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template
<
class
View0,
class
View1,
class
CtrlView, ReifyMode rm>
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ExecStatus
86
ReEq<View0,View1,CtrlView,rm>::post
(
Home
home, View0 x0, View1 x1,
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CtrlView
b
) {
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if
(!
same
(x0,x1)) {
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(void)
new
(home)
ReEq<View0,View1,CtrlView,rm>
(home,x0,x1,
b
);
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}
else
if
(rm !=
RM_IMP
) {
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GECODE_ME_CHECK
(
b
.one(home));
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}
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return
ES_OK
;
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}
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template
<
class
View0,
class
View1,
class
CtrlView, ReifyMode rm>
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Actor
*
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ReEq<View0,View1,CtrlView,rm>::copy
(
Space
& home) {
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return
new
(home)
ReEq<View0,View1,CtrlView,rm>
(home,*
this
);
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}
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template
<
class
View0,
class
View1,
class
CtrlView, ReifyMode rm>
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ExecStatus
104
ReEq<View0,View1,CtrlView,rm>::propagate
(
Space
& home,
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const
ModEventDelta
&) {
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if
(
b
.one()) {
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if
(rm ==
RM_PMI
)
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return
home.
ES_SUBSUMED
(*
this
);
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GECODE_REWRITE
(*
this
,(
Eq<View0,View1>::post
(home(*
this
),x0,x1)));
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}
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if
(
b
.zero()) {
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if
(rm ==
RM_IMP
)
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return
home.
ES_SUBSUMED
(*
this
);
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GECODE_REWRITE
(*
this
,(
Distinct<View0,View1>::post
(home(*
this
),x0,x1)));
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}
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if
(x0.assigned() && x1.assigned()) {
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// directly test x0==x1
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GlbRanges<View0>
x0lb(x0);
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GlbRanges<View1>
x1lb(x1);
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bool
x0eqx1 =
true
;
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for
(; x0lb() && x1lb(); ++x0lb, ++x1lb) {
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if
(x0lb.
min
() != x1lb.
min
() ||
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x0lb.
max
() != x1lb.
max
()) {
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x0eqx1 =
false
;
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break
;
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}
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}
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if
(x0eqx1 && !x0lb() && !x1lb()) {
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if
(rm !=
RM_IMP
)
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GECODE_ME_CHECK
(
b
.one_none(home));
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return
home.
ES_SUBSUMED
(*
this
);
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}
else
{
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if
(rm !=
RM_PMI
)
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GECODE_ME_CHECK
(
b
.zero_none(home));
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return
home.
ES_SUBSUMED
(*
this
);
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}
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}
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// check whether cardinalities still allow equality
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if
(x0.cardMin() > x1.cardMax() ||
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x1.cardMin() > x0.cardMax()) {
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if
(rm !=
RM_PMI
)
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GECODE_ME_CHECK
(
b
.zero_none(home));
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return
home.
ES_SUBSUMED
(*
this
);
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}
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// check glb(x0) subset lub(x1)
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GlbRanges<View0>
x0lb(x0);
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LubRanges<View1>
x1ub(x1);
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Iter::Ranges::Diff<GlbRanges<View0>
,
LubRanges<View1>
> diff1(x0lb, x1ub);
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if
( diff1() ) {
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if
(rm !=
RM_PMI
)
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GECODE_ME_CHECK
(
b
.zero_none(home));
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return
home.
ES_SUBSUMED
(*
this
);
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}
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// check glb(x1) subset lub(x0)
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GlbRanges<View1>
x1lb(x1);
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LubRanges<View0>
x0ub(x0);
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Iter::Ranges::Diff<GlbRanges<View1>
,
LubRanges<View0>
> diff2(x1lb, x0ub);
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if
( diff2() ) {
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if
(rm !=
RM_PMI
)
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GECODE_ME_CHECK
(
b
.zero_none(home));
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return
home.
ES_SUBSUMED
(*
this
);
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}
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return
ES_FIX
;
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}
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}}}
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// STATISTICS: set-prop
Gecode::RM_PMI
@ RM_PMI
Inverse implication for reification.
Definition:
int.hh:869
Gecode::Space::ES_SUBSUMED
ExecStatus ES_SUBSUMED(Propagator &p)
Definition:
core.hpp:3563
Gecode::Set::Rel::ReEq::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition:
re-eq.hpp:104
Gecode::Set::Rel::ReEq::ReEq
ReEq(Space &home, ReEq &)
Constructor for cloning p.
Definition:
re-eq.hpp:53
Gecode::Set::Rel::ReEq::x1
View1 x1
Definition:
rel.hh:177
Gecode::Set::Rel::ReEq::dispose
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition:
re-eq.hpp:76
Gecode::RM_IMP
@ RM_IMP
Implication for reification.
Definition:
int.hh:862
Gecode::PropCost::LO
@ LO
Cheap.
Definition:
core.hpp:513
Gecode::Set::Rel::Eq
Propagator for set equality
Definition:
rel.hh:150
Gecode::Set::Rel::ReEq::b
CtrlView b
Definition:
rel.hh:178
Gecode::Space
Computation spaces.
Definition:
core.hpp:1742
Gecode::Actor
Base-class for both propagators and branchers.
Definition:
core.hpp:628
Gecode
Gecode toplevel namespace
Gecode::Propagator
Base-class for propagators.
Definition:
core.hpp:1064
Gecode::Set::GlbRanges::max
int max(void) const
Return largest value of range.
Gecode::Home
Home class for posting propagators
Definition:
core.hpp:856
Gecode::Set::Rel::same
bool same(VX, VY)
Test whether two views are in fact the same.
Definition:
common.hpp:57
Gecode::Set::Rel::ReEq::reschedule
virtual void reschedule(Space &home)
Schedule function.
Definition:
re-eq.hpp:68
Gecode::Iter::Ranges::Diff
Range iterator for computing set difference.
Definition:
ranges-diff.hpp:43
Gecode::Set::Rel::ReEq
Reified equality propagator
Definition:
rel.hh:174
b
struct Gecode::@602::NNF::@65::@66 b
For binary nodes (and, or, eqv)
Gecode::Set::GlbRanges
Range iterator for the greatest lower bound.
Definition:
var-imp.hpp:359
Gecode::Set::Rel::ReEq::copy
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition:
re-eq.hpp:98
Gecode::Set::GlbRanges::min
int min(void) const
Return smallest value of range.
Gecode::PropCost::ternary
static PropCost ternary(PropCost::Mod m)
Three variables for modifier pcm.
Definition:
core.hpp:4805
Gecode::Set::Rel::ReEq::x0
View0 x0
Definition:
rel.hh:176
Gecode::PropCost
Propagation cost.
Definition:
core.hpp:486
Gecode::Set::Rel::Distinct
Propagator for negated equality
Definition:
rel.hh:268
Gecode::Set::Rel::ReEq::post
static ExecStatus post(Home home, View0 x, View1 y, CtrlView b)
Post propagator for .
Definition:
re-eq.hpp:86
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::ES_FIX
@ ES_FIX
Propagation has computed fixpoint.
Definition:
core.hpp:477
Gecode::Set::LubRanges
Range iterator for the least upper bound.
Definition:
var-imp.hpp:317
forceinline
#define forceinline
Definition:
config.hpp:185
Gecode::Set::PC_SET_ANY
const Gecode::PropCond PC_SET_ANY
Propagate when any bound or the cardinality of a view changes.
Definition:
var-type.hpp:248
GECODE_ME_CHECK
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition:
macros.hpp:52
Gecode::Actor::dispose
virtual size_t dispose(Space &home)
Delete actor and return its size.
Definition:
core.hpp:3252
Gecode::Set::Rel::ReEq::cost
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function (defined as PC_TERNARY_LO)
Definition:
re-eq.hpp:62
Gecode::ModEventDelta
int ModEventDelta
Modification event deltas.
Definition:
core.hpp:89
GECODE_REWRITE
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition:
macros.hpp:116
Gecode::ES_OK
@ ES_OK
Execution is okay.
Definition:
core.hpp:476
p
int p
Number of positive literals for node type.
Definition:
bool-expr.cpp:232
Gecode::ExecStatus
ExecStatus
Definition:
core.hpp:472