exp-log.hpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Vincent Barichard <Vincent.Barichard@univ-angers.fr>
*
* Copyright:
* 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
* 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.
*
*/
namespace Gecode { namespace Float { namespace Transcendental {
/*
* Bounds consistent exponential operator
*
*/
template<class A, class B>
forceinline
Exp<A,B>::Exp(Home home, A x0, B x1)
: MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,x0,x1) {}
template<class A, class B>
ExecStatus
Exp<A,B>::post(Home home, A x0, B x1) {
if (x0 == x1) {
return ES_FAILED;
} else {
GECODE_ME_CHECK(x1.gq(home,0.0));
}
GECODE_ME_CHECK(x1.eq(home,exp(x0.domain())));
if (x1.max() == 0.0)
return ES_FAILED;
GECODE_ME_CHECK(x0.eq(home,log(x1.domain())));
(void) new (home) Exp<A,B>(home,x0,x1);
return ES_OK;
}
template<class A, class B>
forceinline
Exp<A,B>::Exp(Space& home, Exp<A,B>& p)
: MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,p) {}
template<class A, class B>
Actor*
Exp<A,B>::copy(Space& home) {
return new (home) Exp<A,B>(home,*this);
}
template<class A, class B>
ExecStatus
Exp<A,B>::propagate(Space& home, const ModEventDelta&) {
GECODE_ME_CHECK(x1.eq(home,exp(x0.domain())));
if (x1.max() == 0.0)
return ES_FAILED;
GECODE_ME_CHECK(x0.eq(home,log(x1.domain())));
return x0.assigned() ? home.ES_SUBSUMED(*this) : ES_FIX;
}
/*
* Bounds consistent logarithm operator with base
*
*/
template<class A, class B>
forceinline
Pow<A,B>::Pow(Home home, FloatNum base0, A x0, B x1)
: MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,x0,x1),
base(base0) {}
template<class A, class B>
ExecStatus
Pow<A,B>::post(Home home, FloatNum base, A x0, B x1) {
if (base <= 0) return ES_FAILED;
if (x0 == x1) {
GECODE_ME_CHECK(x0.eq(home,0.0));
} else {
GECODE_ME_CHECK(x1.gq(home,0.0));
if (x1.max() == 0.0)
return ES_FAILED;
GECODE_ME_CHECK(x0.eq(home,log(x1.domain())/log(base)));
GECODE_ME_CHECK(x1.eq(home,exp(x0.domain()*log(base))));
(void) new (home) Pow<A,B>(home,base,x0,x1);
}
return ES_OK;
}
template<class A, class B>
forceinline
Pow<A,B>::Pow(Space& home, Pow<A,B>& p)
: MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,p),
base(p.base) {}
template<class A, class B>
Actor*
Pow<A,B>::copy(Space& home) {
return new (home) Pow<A,B>(home,*this);
}
template<class A, class B>
ExecStatus
Pow<A,B>::propagate(Space& home, const ModEventDelta&) {
if (x1.max() == 0.0)
return ES_FAILED;
GECODE_ME_CHECK(x0.eq(home,log(x1.domain())/log(base)));
GECODE_ME_CHECK(x1.eq(home,exp(x0.domain()*log(base))));
return x0.assigned() ? home.ES_SUBSUMED(*this) : ES_FIX;
}
}}}
// STATISTICS: float-prop
Gecode::Actor
Base-class for both propagators and branchers.
Definition core.hpp:628
Gecode::Float::Transcendental::Exp::post
static ExecStatus post(Home home, A x0, B x1)
Post propagator for .
Definition exp-log.hpp:48
Gecode::Float::Transcendental::Exp::copy
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition exp-log.hpp:70
Gecode::Float::Transcendental::Exp::Exp
Exp(Space &home, Exp &p)
Constructor for cloning p.
Definition exp-log.hpp:65
Gecode::Float::Transcendental::Exp::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition exp-log.hpp:76
Gecode::Float::Transcendental::Pow::post
static ExecStatus post(Home home, FloatNum base, A x0, B x1)
Post propagator for .
Definition exp-log.hpp:98
Gecode::Float::Transcendental::Pow::Pow
Pow(Space &home, Pow &p)
Constructor for cloning p.
Definition exp-log.hpp:115
Gecode::Float::Transcendental::Pow::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition exp-log.hpp:127
Gecode::Float::Transcendental::Pow::base
FloatNum base
Definition transcendental.hh:87
Gecode::Float::Transcendental::Pow::copy
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition exp-log.hpp:121
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::FloatNum
double FloatNum
Floating point number base type.
Definition float.hh:106
Gecode::Float::Transcendental
Transcendental 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::log
void log(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition transcendental.cpp:53
Gecode::exp
void exp(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition transcendental.cpp:45
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
Gecode::ES_FAILED
@ ES_FAILED
Execution has resulted in failure.
Definition core.hpp:474
forceinline
#define forceinline
Definition config.hpp:187