/usr/include/linbox/randiter/gf2.h is in liblinbox-dev 1.1.6~rc0-4.1.
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/* linbox/randiter/gf2.h
* Copyright (C) 2003 Bradford Hovinen
*
* Written by Bradford Hovinen <bghovinen@math.uwaterloo.ca>
*
* ------------------------------------
*
* See COPYING for license information.
*/
#ifndef __RANDITER_GF2_H
#define __RANDITER_GF2_H
#include <iostream>
#include <vector>
#include "time.h"
#include "linbox/integer.h"
#include "linbox/field/modular.h"
#include "linbox/element/abstract.h"
#include "linbox/element/envelope.h"
#include "linbox/util/commentator.h"
#include "linbox/randiter/mersenne-twister.h"
#include "linbox/vector/bit-vector.h"
#include "linbox/linbox-config.h"
#ifdef __LINBOX_XMLENABLED
#include "linbox/util/xml/linbox-reader.h"
#include "linbox/util/xml/linbox-writer.h"
#include <iostream>
#include <string>
#endif
namespace LinBox
{
class GF2RandIter
{
public:
typedef bool Element;
/** Constructor from field, sampling size, and seed.
* The random field element iterator works in the field F, is seeded
* by seed, and it returns any one element with probability no more
* than 1/min (size, F.cardinality (c)).
* A sampling size of zero means to sample from the entire field.
* A seed of zero means to use some arbitrary seed for the generator.
* Purely virtual.
* @param F LinBox field archetype object in which to do arithmetic
* @param size constant integer reference of sample size from which to
* sample (default = modulus of field)
* @param seed constant integer reference from which to seed random number
* generator (default = 0)
*/
GF2RandIter (const GF2 &F,
const integer &size = 0,
const integer &seed = 0)
{
long _seed = seed;
if (_seed == 0) _seed = time (NULL);
_MT.setSeed (_seed);
}
GF2RandIter (const GF2RandIter &R) {}
/** Destructor.
* This destructs the random field element generator object.
*/
~GF2RandIter () {}
/** Assignment operator.
* Assigns ModularRandIter object R to generator.
* @param R ModularRandIter object.
*/
GF2RandIter &operator = (const GF2RandIter &R)
{ return *this; }
/** 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.
* @return reference to random field element
*/
bool &random (bool &a) const
{ return a = _MT.randomIntRange (0, 2); }
/** 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.
* @return reference to random field element
*/
BitVector::reference random (BitVector::reference a) const
{ return a = _MT.randomIntRange (0, 2); }
/** 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.
* @return reference to random field element
*/
std::_Bit_reference random (std::_Bit_reference a) const
{ return a = _MT.randomIntRange (0, 2); }
/** 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.
* @return reference to random field element
*/
ElementAbstract &random (ElementAbstract &a) const
{
bool tmp;
random (tmp);
return (a = ElementEnvelope <GF2> (tmp));
}
private:
MersenneTwister _MT;
}; // class GF2RandIter
} // namespace LinBox
#endif // __RANDITER_GF2_H
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