/usr/include/linbox/ring/ntl/ntl-gf2e.h is in liblinbox-dev 1.4.2-5build1.
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* Copyright (C) 2004 Pascal Giorgi
* Copyright (C) 2011 LinBox
*
* Written by Pascal Giorgi <pascal.giorgi@ens-lyon.fr>
*
* Modified by W. J. Turner <wjturner@acm.org>
*
* ========LICENCE========
* This file is part of the library LinBox.
*
* LinBox is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* ========LICENCE========
*/
/*! @file field/ntl/ntl-GF2E.h
* @ingroup field
* @ingroup NTL
* @brief NO DOC
*/
#ifndef __LINBOX_field_ntl_gf2e_H
#define __LINBOX_field_ntl_gf2e_H
#ifndef __LINBOX_HAVE_NTL
#error "you need NTL here"
#endif
#include <NTL/GF2XFactoring.h>
#include <NTL/GF2E.h>
#include <time.h>
#include "linbox/linbox-config.h"
#include "linbox/util/debug.h"
#include <givaro/zring.h>
#include "linbox/field/field-traits.h"
#include "linbox/integer.h"
namespace Givaro
{
template<>
// NTL::GF2E& Givaro::ZRing<NTL::GF2E>::init (NTL::GF2E &x, const Integer &y) const
NTL::GF2E& Caster(NTL::GF2E &x, const Integer &y)
{
x=NTL::to_GF2E(static_cast<int64_t>(y));
return x;
}
template<>
// NTL::GF2E& Givaro::ZRing<NTL::GF2E>::init (NTL::GF2E &x, const double &y) const
NTL::GF2E& Caster(NTL::GF2E &x, const double &y)
{
x=NTL::to_GF2E(static_cast<long>(y));
return x;
}
template<>
// Integer& Givaro::ZRing<NTL::GF2E>::convert (Integer& x, const NTL::GF2E &y) const {
Integer& Caster(Integer& x, const NTL::GF2E &y)
{
NTL::GF2X poly = rep(y);
long i;
x = 0;
for(i = deg(poly); i >= 0; --i) {
x <<= 1;
x += static_cast<int64_t>(rep(coeff(poly, i)));
}
return x;
}
} // namespace Givaro
// Namespace in which all LinBox library code resides
namespace LinBox
{
/// \ingroup field
class NTL_GF2E_Initialiser {
public :
NTL_GF2E_Initialiser( const Integer & p, size_t k = 1) {
linbox_check(p == 2);
// if(p != 2) throw PreconditionFailed(LB_FILE_LOC,"modulus must be 2");
NTL::GF2X irredPoly = NTL::BuildSparseIrred_GF2X((long) k);
NTL::GF2E::init(irredPoly);
}
// template <class ElementInt>
// NTL_GF2E_Initialiser(const ElementInt& d) {
// NTL::ZZ_p::init (NTL::to_ZZ(d));
// }
// NTL_GF2E_Initialiser (const NTL::ZZ& d) {
// NTL::ZZ_p::init(d);
// }
};
/*
* Define a parameterized class to easily handle Givaro::ZRing<NTL::GF2E> field
*/
class NTL_GF2E : public NTL_GF2E_Initialiser, public Givaro::UnparametricOperations<NTL::GF2E> {
public:
typedef NTL::GF2E Element ;
typedef Givaro::UnparametricOperations<Element> Father_t ;
typedef UnparametricRandIter<Element> RandIter;
const Element zero,one,mOne ;
NTL_GF2E (const integer &p, const int32_t &k) :
NTL_GF2E_Initialiser(p,k),Father_t ()
,zero( NTL::to_GF2E(0)),one( NTL::to_GF2E(1)),mOne(-one)
{ }
bool isZero (const Element& a) const
{
return NTL::IsZero(a);
}
bool isOne (const Element& a) const
{
return NTL::IsOne(a);
}
bool isMOne (const Element& x) const
{
Element y ; neg(y,x);
return isOne(y);
}
integer& characteristic (integer &c) const
{
return c = 2;
}
integer& cardinality(integer& c) const
{
c=1;
c<<= static_cast<int64_t>(Element::degree());
return c;
}
Element& inv(Element& x, const Element& y) const
{
x=NTL::to_GF2E(1)/y;
return x;
}
Element& invin(Element& x) const
{
x=NTL::to_GF2E(1)/x;
return x;
}
std::istream& read(std::istream& is, Element& x) const
{
long tmp= 0;
is>>tmp;
x=NTL::to_GF2E(tmp);
return is;
}
}; // end o class NTL_GF2E
template <class Ring>
struct ClassifyRing;
template <class Element>
struct ClassifyRing<UnparametricRandIter<Element> >;
template <>
struct ClassifyRing<UnparametricRandIter<NTL::GF2E> > {
typedef RingCategories::ModularTag categoryTag;
};
template<>
class UnparametricRandIter<NTL::GF2E> {
public:
typedef NTL::GF2E Element;
UnparametricRandIter<NTL::GF2E>(const NTL_GF2E & F,
const size_t& size = 0,
const size_t& seed = 0
) :
_size(size), _seed(seed)
{
if(_seed == 0)
NTL::SetSeed(NTL::to_ZZ(time(0)));
else
NTL::SetSeed(NTL::to_ZZ(_seed));
}
UnparametricRandIter<NTL::GF2E>(const UnparametricRandIter<NTL::GF2E>& R) :
_size(R._size), _seed(R._seed)
{
if(_seed == 0)
NTL::SetSeed(NTL::to_ZZ(time(0)));
else
NTL::SetSeed(NTL::to_ZZ(_seed));
}
Element& random (Element& x) const
{
NTL::random(x);
return x;
}
protected:
size_t _size;
size_t _seed;
};
}
#endif //__LINBOX_ntl_gf2e_H
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