/usr/include/linbox/element/gmp-rational.h is in liblinbox-dev 1.4.2-3.
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* Copyright (C) 2001-2002 Bradford Hovinen
*
* Written by 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========
*/
#ifndef __LINBOX_element_gmp_rational_H
#define __LINBOX_element_gmp_rational_H
#include "linbox/integer.h"
#include <gmp.h>
namespace LinBox
{
// Forward declarations
class GMPRationalField;
class GMPRationalRandIter;
/** \brief elements of GMP_Rationals.
\ingroup element
*/
class GMPRationalElement {
public:
/** @name Common Object Interface for LinBox Field elements.
* These methods are required of all \ref LinBox
* @link Fields field@endlink elements.
*/
//@{
/** Default constructor.
* This constructor is required to allow
* @link Fields field@endlink elements to be primitive C++ types.
* Because constructor does not know what @link Fields field@endlink
* the element belongs to, it cannot actually construct the element.
* In this implementation, the constructor it sets _elem_ptr
* to the null pointer. Initialization of the element is done through
* the field function init where the field is known.
*/
GMPRationalElement(void) { mpq_init (rep); }
/** Copy constructor.
* This constructor is required to allow
* @link Fields field@endlink elements to be primitive C++ types,
* and to allow field elements to be passed by value into
* functions.
* Constructs @link Fields field@endlink element by copying the
* @link Fields field@endlink element.
* In this implementation, this means copying the element to
* which a._elem_ptr points.
* @param a field element.
*/
GMPRationalElement(const GMPRationalElement& a)
{ mpq_init (rep); mpq_set (rep, a.rep); }
/** Destructor.
* In this implementation, this destroys element by deleting field
* element to which _elem_ptr points.
*/
~GMPRationalElement() { mpq_clear (rep); }
/** Assignment operator.
* Assigns element a to element.
* In this implementation, this is done
* by copying field element to which _elem_ptr points.
* @param a field element.
*/
GMPRationalElement& operator=(const GMPRationalElement& a)
{
if (this != &a) { // guard against self-assignment
mpq_set (rep, a.rep);
}
return *this;
}
//@} Common Object Interface
/** @name Implementation-Specific Methods.
* These methods are not required of all LinBox field elements
* and are included only for this implementation of the archetype.
*/
//@{
/** Constructor.
* Constructs field element from an mpq_t
* Not part of the interface.
* Creates new copy of element object in dynamic memory.
* @param _rep pointer to \ref ElementAbstract
*/
GMPRationalElement (mpq_t _rep) {
mpq_init (rep);
mpq_set (rep, _rep);
}
/** Constructor.
* Initialize from numerator and denominator
* @param num,den
*/
GMPRationalElement (const integer &num, const integer &den)
{
mpq_init (rep);
mpz_set (mpq_numref (rep), SpyInteger::get_rep(num));
mpz_set (mpq_denref (rep), SpyInteger::get_rep(den));
}
// Added by Rich Seagraves to take care of some headaches
/** Constructor.
* Initalizes from a single integer, (which is assumed to be the
* numerator, with the denominator being 1)
* @param num
*/
GMPRationalElement(const integer &num)
{
mpq_init (rep);
/*
//potential error, error occurs when |num| is bigger than largest int
mpz_set_si (mpq_numref(rep), num);
mpz_set_si (mpq_denref(rep), integer(1));
*/
mpq_set_z(rep, SpyInteger::get_rep(num));
}
/// access representation
mpq_ptr get_rep() {return rep;}
//@}p
private:
friend class GMPRationalField;
friend class GMPRationalRandIter;
/** @name Implementation-Specific Data.
* This data is not required of all LinBox field elements
* and is included only for this implementation of the archetype.
*/
//@{
/** Pointer to parameterized field element.
* Not part of the common object interface for \ref LinBox field elements.
* Included to avoid code bloat.
*/
mutable mpq_t rep;
//@} Non-Interface
};
} // namespace LinBox
#endif // __LINBOX_element_gmp_rational_H
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