/usr/include/linbox/randiter/gmp-rational.h is in liblinbox-dev 1.4.2-3.
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* Copyright (C) 2001-2002 Bradford Hovinen
*
* Written by William J Turner <wjturner@acm.org>,
* Bradford Hovinen <hovinen@cis.udel.edu>
*
* ========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 randiter/gmp-rational.h
* @ingroup randiter
* @brief Generate a random rational with prescribed size.
*/
#ifndef __LINBOX_randiter_gmp_rational_H
#define __LINBOX_randiter_gmp_rational_H
#include "linbox/field/gmp-rational.h"
#include "linbox/element/gmp-rational.h"
#include "linbox/element/abstract.h"
#include "linbox/element/envelope.h"
#include "linbox/linbox-config.h"
#include <sys/time.h>
#include <stdlib.h>
namespace LinBox
{
class GMPRationalRandIter {
public:
/// Element type.
typedef GMPRationalElement Element;
/*! Rational number random iterator.
* @ingroup rationals
* @ingroup randiter
*
* @param F rational field
* @param size ??.
* @param seed seed for random generator. By default it is 0
* and a new one is created.
*/
GMPRationalRandIter (const GMPRationalField &F,
const integer &size = 0,
const integer &seed = 0) :
_field (F), _size (size), _seed (seed)
{
if (seed == 0)
_seed = uint32_t(time (NULL));
}
/// Copy constructor
/// @param R Random iterator to copy.
GMPRationalRandIter (const GMPRationalRandIter& R) :
_field (R._field), _size (R._size), _seed (R._seed)
{}
/// Destructor.
~GMPRationalRandIter()
{}
/*! Copy.
* @param R Random iterator to copy.
* @return a reference to this copy.
*/
GMPRationalRandIter& operator=(const GMPRationalRandIter& R)
{
if (this != &R) { // guard against self-assignment
_field = R._field;
_seed = R._seed;
_size = R._size;
}
return *this;
}
/*! get a random number.
* @param[out] a a random rational.
*/
Element &random (Element &a) const
{
if (_size == 0) {
unsigned int s;
s = _seed;
//(rand_r is obsolete)
srand (s);
int value = rand();
mpz_set_si (mpq_numref (a.rep), value);
do {
value = rand();
} while (value == 0);
const_cast<integer&>(_seed) = s;
mpz_set_si (mpq_denref (a.rep), value);
}
else {
unsigned int s;
int num, den;
s = _seed;
srand (s);
num = rand();
if (_size > 0) {
int tmp = (int)_size;
num %= tmp;
den = 1L;
}
else {
srand (s);
den = rand();
}
const_cast<integer&>(_seed) = s;
mpz_set_si (mpq_numref (a.rep), num);
mpz_set_si (mpq_denref (a.rep), den);
}
mpq_canonicalize (a.rep);
return a;
}
/** Random field element creator.
* This returns a random field element from the information supplied
* at the creation of the generator.
* Required by abstract base class.
* @param[out] a random field element.
* @return reference to random field element \p a.
*/
ElementAbstract &random (ElementAbstract &a) const
{
Element tmp;
random (tmp);
return (a = ElementEnvelope <GMPRationalField> (tmp));
}
const GMPRationalField& ring() const { return _field; }
private:
GMPRationalField _field; //!< @internal rational field
integer _size; //!< @internal ??
integer _seed; //!< @internal seed
}; // class GMPRationalRandIter
} // namespace LinBox
#endif // __LINBOX_randiter_gmp_random_H
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