abs.hpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
* Guido Tack <tack@gecode.org>
* Vincent Barichard <Vincent.Barichard@univ-angers.fr>
*
* Copyright:
* Christian Schulte, 2004
* Guido Tack, 2006
* Vincent Barichard, 2012
*
* 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
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*
* 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,
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namespace Gecode { namespace Float { namespace Arithmetic {
template<class A, class B>
forceinline
Abs<A,B>::Abs(Home home, A x0, B x1)
: MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,x0,x1) {}
template<class A, class B>
ExecStatus
Abs<A,B>::post(Home home, A x0, B x1) {
GECODE_ME_CHECK(x1.eq(home,abs(x0.val())));
if (x0.min() >= 0)
GECODE_ME_CHECK(x0.eq(home,FloatVal(x1.min(), x1.max())));
else if (x0.max() <= 0)
GECODE_ME_CHECK(x0.eq(home,FloatVal(-x1.max(), -x1.min())));
else
GECODE_ME_CHECK(x0.eq(home,FloatVal(-x1.max(), x1.max())));
(void) new (home) Abs<A,B>(home,x0,x1);
return ES_OK;
}
template<class A, class B>
forceinline
Abs<A,B>::Abs(Space& home, Abs<A,B>& p)
: MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,p) {}
template<class A, class B>
Actor*
Abs<A,B>::copy(Space& home) {
return new (home) Abs<A,B>(home,*this);
}
template<class A, class B>
ExecStatus
Abs<A,B>::propagate(Space& home, const ModEventDelta&) {
GECODE_ME_CHECK(x1.eq(home,abs(x0.val())));
if (x0.min() >= 0)
GECODE_ME_CHECK(x0.eq(home,FloatVal(x1.min(), x1.max())));
else if (x0.max() <= 0)
GECODE_ME_CHECK(x0.eq(home,FloatVal(-x1.max(), -x1.min())));
else
GECODE_ME_CHECK(x0.eq(home,FloatVal(-x1.max(), x1.max())));
return (x0.assigned() && x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_FIX;
}
}}}
// STATISTICS: float-prop
Gecode::Actor
Base-class for both propagators and branchers.
Definition core.hpp:628
Gecode::FloatVal
Float value type.
Definition float.hh:334
Gecode::Float::Arithmetic::Abs::Abs
Abs(Space &home, Abs &p)
Constructor for cloning p.
Definition abs.hpp:61
Gecode::Float::Arithmetic::Abs::post
static ExecStatus post(Home home, A x0, B x1)
Post propagator for .
Definition abs.hpp:47
Gecode::Float::Arithmetic::Abs::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition abs.hpp:72
Gecode::Float::Arithmetic::Abs::copy
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition abs.hpp:66
Gecode::Home
Home class for posting propagators
Definition core.hpp:856
Gecode::MixBinaryPropagator< A, PC_FLOAT_BND, B, PC_FLOAT_BND >::x1
B x1
Definition pattern.hpp:209
Gecode::MixBinaryPropagator< A, PC_FLOAT_BND, B, PC_FLOAT_BND >::MixBinaryPropagator
MixBinaryPropagator(Space &home, MixBinaryPropagator &p)
Definition pattern.hpp:597
Gecode::MixBinaryPropagator< A, PC_FLOAT_BND, B, PC_FLOAT_BND >::x0
A x0
Definition pattern.hpp:207
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
Gecode::Float::Arithmetic
Arithmetic propagators
Gecode::Float
Floating point numbers.
Gecode::Float::PC_FLOAT_BND
const Gecode::PropCond PC_FLOAT_BND
Propagate when minimum or maximum of a view changes.
Definition var-type.hpp:292
Gecode
Gecode toplevel namespace
Gecode::abs
void abs(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition arithmetic.cpp:41
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
forceinline
#define forceinline
Definition config.hpp:187