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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2007
*
* 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.
*
*/
#include <gecode/int/channel.hh>
namespace Gecode { namespace Int { namespace Channel {
forceinline
LinkSingle::LinkSingle(Space& home, LinkSingle& p)
: MixBinaryPropagator<BoolView,PC_BOOL_VAL,IntView,PC_INT_VAL>
(home,p) {}
Actor*
LinkSingle::copy(Space& home) {
return new (home) LinkSingle(home,*this);
}
PropCost
LinkSingle::cost(const Space&, const ModEventDelta&) const {
return PropCost::unary(PropCost::LO);
}
ExecStatus
LinkSingle::propagate(Space& home, const ModEventDelta&) {
if (x0.zero()) {
GECODE_ME_CHECK(x1.eq(home,0));
} else if (x0.one()) {
GECODE_ME_CHECK(x1.eq(home,1));
} else {
assert(x0.none() && x1.assigned());
if (x1.val() == 0) {
GECODE_ME_CHECK(x0.zero_none(home));
} else {
assert(x1.val() == 1);
GECODE_ME_CHECK(x0.one_none(home));
}
}
return home.ES_SUBSUMED(*this);
}
}}}
// STATISTICS: int-prop
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