link-single.cpp
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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
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#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
Gecode::Int::Channel::LinkSingle
Link propagator for a single Boolean view.
Definition channel.hh:171
Gecode::Int::Channel::LinkSingle::cost
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function (defined as low unary).
Definition link-single.cpp:49
Gecode::Int::Channel::LinkSingle::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition link-single.cpp:54
Gecode::Int::Channel::LinkSingle::copy
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition link-single.cpp:44
Gecode::MixBinaryPropagator< BoolView, PC_BOOL_VAL, IntView, PC_INT_VAL >::x1
IntView x1
Definition pattern.hpp:209
Gecode::MixBinaryPropagator< BoolView, PC_BOOL_VAL, IntView, PC_INT_VAL >::x0
BoolView x0
Definition pattern.hpp:207
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::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
channel.hh
Gecode::Int::Channel
Channel propagators
Gecode::Int
Finite domain integers.
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::Int::PC_BOOL_VAL
const Gecode::PropCond PC_BOOL_VAL
Propagate when a view becomes assigned (single value).
Definition var-type.hpp:126
Gecode
Gecode toplevel namespace
Gecode::ExecStatus
ExecStatus
Definition core.hpp:472
forceinline
#define forceinline
Definition config.hpp:187