/usr/include/gecode/float/arithmetic/pow-nroot.hpp is in libgecode-dev 5.1.0-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* Main authors:
* Vincent Barichard <Vincent.Barichard@univ-angers.fr>
*
* Copyright:
* Vincent Barichard, 2012
*
* Last modified:
* $Date: 2016-04-19 17:19:45 +0200 (Tue, 19 Apr 2016) $ by $Author: schulte $
* $Revision: 14967 $
*
* 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 Arithmetic {
/*
* Bounds consistent square operator
*
*/
template<class A, class B>
forceinline
Pow<A,B>::Pow(Home home, A x0, B x1, int n)
: MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,x0,x1), m_n(n) {}
template<class A, class B>
ExecStatus
Pow<A,B>::post(Home home, A x0, B x1, int n) {
if (n == 0) {
if ((x0.min() == 0.0) && (x0.max() == 0.0)) return ES_FAILED;
GECODE_ME_CHECK(x1.eq(home,1.0));
return ES_OK;
}
GECODE_ME_CHECK(x1.eq(home,pow(x0.domain(),n)));
if ((x1.min() == 0.0) && (x1.max() == 0.0)) {
GECODE_ME_CHECK(x1.eq(home,0.0));
return ES_OK;
}
if ((n % 2) == 0)
{
if (x0.min() >= 0)
GECODE_ME_CHECK(x0.eq(home,nroot(x1.domain(),n)));
else if (x0.max() <= 0)
GECODE_ME_CHECK(x0.eq(home,-nroot(x1.domain(),n)));
else
GECODE_ME_CHECK(x0.eq(home,
hull(
nroot(x1.domain(),n),
-nroot(x1.domain(),n)
)
));
} else
GECODE_ME_CHECK(x0.eq(home,nroot(x1.domain(),n)));
if (!x0.assigned()) (void) new (home) Pow<A,B>(home,x0,x1,n);
return ES_OK;
}
template<class A, class B>
forceinline
Pow<A,B>::Pow(Space& home, bool share, Pow<A,B>& p)
: MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,share,p), m_n(p.m_n) {}
template<class A, class B>
Actor*
Pow<A,B>::copy(Space& home, bool share) {
return new (home) Pow<A,B>(home,share,*this);
}
template<class A, class B>
ExecStatus
Pow<A,B>::propagate(Space& home, const ModEventDelta&) {
if ((x0.min() == 0.0) && (x0.max() == 0.0)) return ES_FAILED;
GECODE_ME_CHECK(x1.eq(home,pow(x0.domain(),m_n)));
if ((x1.min() == 0.0) && (x1.max() == 0.0)) {
GECODE_ME_CHECK(x1.eq(home,0.0));
return home.ES_SUBSUMED(*this);
}
if ((m_n % 2) == 0)
{
if (x0.min() >= 0)
GECODE_ME_CHECK(x0.eq(home,nroot(x1.domain(),m_n)));
else if (x0.max() <= 0)
GECODE_ME_CHECK(x0.eq(home,-nroot(x1.domain(),m_n)));
else
GECODE_ME_CHECK(x0.eq(home,
hull(
nroot(x1.domain(),m_n),
-nroot(x1.domain(),m_n)
)
));
} else
GECODE_ME_CHECK(x0.eq(home,nroot(x1.domain(),m_n)));
return x0.assigned() ? home.ES_SUBSUMED(*this) : ES_FIX;
}
/*
* Bounds consistent square root operator
*
*/
template<class A, class B>
forceinline
NthRoot<A,B>::NthRoot(Home home, A x0, B x1, int n)
: MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,x0,x1), m_n(n) {}
template<class A, class B>
ExecStatus
NthRoot<A,B>::post(Home home, A x0, B x1, int n) {
if (n == 0) return ES_FAILED;
GECODE_ME_CHECK(x0.gq(home,0.0));
(void) new (home) NthRoot<A,B>(home,x0,x1,n);
return ES_OK;
}
template<class A, class B>
forceinline
NthRoot<A,B>::NthRoot(Space& home, bool share, NthRoot<A,B>& p)
: MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,share,p), m_n(p.m_n) {}
template<class A, class B>
Actor*
NthRoot<A,B>::copy(Space& home, bool share) {
return new (home) NthRoot<A,B>(home,share,*this);
}
template<class A, class B>
ExecStatus
NthRoot<A,B>::propagate(Space& home, const ModEventDelta&) {
GECODE_ME_CHECK(x1.eq(home,nroot(x0.domain(),m_n)));
GECODE_ME_CHECK(x0.eq(home,pow(x1.domain(),m_n)));
return x0.assigned() ? home.ES_SUBSUMED(*this) : ES_FIX;
}
}}}
// STATISTICS: float-prop
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