/usr/include/linbox/field/Givaro/givaro-rational.h is in liblinbox-dev 1.3.2-1.1build2.
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* Copyright (C) 2004 Gilles Villard
*
* Created Gilles Villard < Gilles.Villard@ens-lyon.fr>
* ven oct 8 13:30:05 CEST 2004
* ========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========
*/
#ifndef __LINBOX_givaro_rational_H
#define __LINBOX_givaro_rational_H
#include "linbox/integer.h"
#include "linbox/field/unparametric.h"
#include "linbox/field/field-traits.h"
//------------------------------------
// Files of Givaro library
#include "givaro/givrational.h"
//------------------------------------
namespace LinBox
{
template <class Ring>
struct ClassifyRing;
class GivaroRational;
template<>
struct ClassifyRing<GivaroRational> {
typedef RingCategories::RationalTag categoryTag;
};
class GivaroRational : public UnparametricField< Givaro::Rational> {
public:
/** Element type.
*
*/
typedef Givaro::Rational Element;
Element zero,one,mOne;
Element& init(Element& x , const integer& y) const
{
return x=Element(y);
}
Element& init(Element& x , const integer& n,const integer& d) const
{
return x=Element(n,d);
}
template<class XX>
Element& init(Element& x , const XX& y) const
{
return x=Element(y);
}
std::istream &read(std::istream & s, Element &a) const
{
s >> a;
return s;
}
integer& convert(integer& i, const Element& r) const
{
return i=r.nume();
}
Element& assign(Element& x , const Element& y) const
{
return x=y;
}
// x = numerator of y
integer& get_num (integer& x, const Element& y) const
{
return x = y.nume();
}
// x = denominator of y
integer& get_den (integer& x, const Element& y) const
{
return x = y.deno();
}
}; // class
} // namespace LinBox
// Specialization of homomorphism for basefield
#include "linbox/field/hom.h"
namespace LinBox
{
template <class _Target>
class Hom<GivaroRational, _Target> {
public:
typedef GivaroRational Source;
typedef _Target Target;
typedef typename Source::Element SrcElt;
typedef typename Target::Element Elt;
Hom(const Source& S, const Target& T) :
_source (S), _target(T)
{
}
Elt& image(Elt& t, const SrcElt& s)
{
_source. get_num (num, s);
_source. get_den (den, s);
if (den == 1) {
return _target.init(t,num);
}
else if (num == 1) {
_target.init(t,den);
return _target.invin(t);
}
else {
_target. init (tmp, den);
_target. init (t, num);
return _target. divin (t, tmp);
}
// _target. init (t, den);
// return _target. invin (t);
}
SrcElt& preimage(SrcElt& s, const Elt& t)
{
_target. convert (num, t);
_source. init (s, num);
return s;
}
const Source& source()
{
return _source;
}
const Target& target()
{
return _target;
}
protected:
integer num, den;
Elt tmp;
Source _source;
Target _target;
}; // end Hom
template <>
class Hom<GivaroRational,GivaroRational> {
public:
typedef GivaroRational Source;
typedef Source Target;
typedef Source::Element SrcElt;
typedef Target::Element Elt;
Hom(const Source& S, const Target& T) :
_source (S), _target(T)
{
}
Elt& image(Elt& t, const SrcElt& s) {
_target.assign(t, s);
return t;
}
SrcElt& preimage(SrcElt& s, const Elt& t)
{
_source.assign(s, t);
return s;
}
const Source& source() {
return _source;
}
const Target& target() {
return _target;
}
protected:
Source _source;
Target _target;
}; // end Hom
}
#endif // __LINBOX_givaro_rational_H
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