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1.8.4
gecode
int
circuit
dom.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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* Christian Schulte <schulte@gecode.org>
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*
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* Copyright:
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* Christian Schulte, 2007
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*
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* Last modified:
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* $Date: 2011-09-06 14:19:49 +0200 (Tue, 06 Sep 2011) $ by $Author: schulte $
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* $Revision: 12393 $
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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
Int {
namespace
Circuit {
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/*
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* The actual propagator
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*
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*/
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template
<
class
View,
class
Offset>
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forceinline
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Dom<View,Offset>::Dom
(
Home
home,
ViewArray<View>
&
x
,
Offset
& o)
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:
Base
<View,
Offset
>(home,x,o) {}
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template
<
class
View,
class
Offset>
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forceinline
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Dom<View,Offset>::Dom
(
Space
& home,
bool
share,
Dom<View,Offset>
&
p
)
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:
Base
<View,
Offset
>(home,share,p) {}
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template
<
class
View,
class
Offset>
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Actor
*
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Dom<View,Offset>::copy
(
Space
& home,
bool
share) {
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return
new
(home)
Dom<View,Offset>
(home,share,*
this
);
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}
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template
<
class
View,
class
Offset>
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PropCost
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Dom<View,Offset>::cost
(
const
Space
&,
const
ModEventDelta
& med)
const
{
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if
(View::me(med) ==
Int::ME_INT_VAL
)
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return
PropCost::linear
(
PropCost::LO
,
x
.size());
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else
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return
PropCost::quadratic
(
PropCost::HI
,
x
.size());
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}
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template
<
class
View,
class
Offset>
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ExecStatus
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Dom<View,Offset>::propagate
(
Space
& home,
const
ModEventDelta
& med) {
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if
(View::me(med) ==
Int::ME_INT_VAL
) {
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GECODE_ES_CHECK
((Int::Distinct::prop_val<View,true>(home,y)));
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ExecStatus
escv = connected(home);
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if
(escv !=
ES_FIX
)
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return
escv;
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if
(y.size() < 2)
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return
home.
ES_SUBSUMED
(*
this
);
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return
home.
ES_FIX_PARTIAL
(*
this
,View::med(
Int::ME_INT_DOM
));
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}
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if
(dc.available()) {
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GECODE_ES_CHECK
(dc.sync(home));
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}
else
{
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GECODE_ES_CHECK
(dc.init(home,y));
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}
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bool
assigned
;
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GECODE_ES_CHECK
(dc.propagate(home,assigned));
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ExecStatus
esc = connected(home);
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if
(esc !=
ES_FIX
)
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return
esc;
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// Elminiate assigned views from y, as they have been assigned
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// and propagated by domain consistent propagation. This is required
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// as we need to know how many assigned views actually exist.
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if
(assigned)
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for
(
int
i
=y.
size
();
i
--; )
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if
(y[
i
].
assigned
())
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y.move_lst(
i
);
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return
path
(home);
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}
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template
<
class
View,
class
Offset>
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ExecStatus
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Dom<View,Offset>::post
(
Home
home,
ViewArray<View>
&
x
,
Offset
& o) {
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int
n
= x.
size
();
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if
(n == 1) {
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GECODE_ME_CHECK
(o(x[0]).eq(home,0));
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}
else
if
(n == 2) {
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GECODE_ME_CHECK
(o(x[0]).eq(home,1));
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GECODE_ME_CHECK
(o(x[1]).eq(home,0));
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}
else
{
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for
(
int
i
=n;
i
--; ) {
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GECODE_ME_CHECK
(o(x[
i
]).gq(home,0));
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GECODE_ME_CHECK
(o(x[i]).le(home,n));
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GECODE_ME_CHECK
(o(x[i]).nq(home,i));
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}
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(void)
new
(home)
Dom<View,Offset>
(home,
x
,o);
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}
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return
ES_OK
;
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}
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}}}
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// STATISTICS: int-prop
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