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// Copyright (c) 1999 Utrecht University (The Netherlands),
// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org); 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; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/CGAL-3.2-branch/Number_types/include/CGAL/number_utils.h $
// $Id: number_utils.h 28567 2006-02-16 14:30:13Z lsaboret $
//
//
// Author(s) : Stefan Schirra
#ifndef CGAL_NUMBER_UTILS_H
#define CGAL_NUMBER_UTILS_H
#include <CGAL/config.h>
#include <CGAL/enum.h>
#include <CGAL/number_utils_fwd.h>
CGAL_BEGIN_NAMESPACE
template <class NT>
inline
bool
is_zero(const NT& x)
{ return x == 0; }
template <class NT>
inline
bool
is_one(const NT& x)
{ return x == 1; }
template <class NT>
inline
bool
is_negative(const NT& x)
{ return x < 0; }
template <class NT>
inline
bool
is_positive(const NT& x)
{ return 0 < x; }
template <class NT>
inline
Sign
sign(const NT& x)
{ return (x < 0) ? NEGATIVE : (0 < x) ? POSITIVE : ZERO; }
template <class NT>
inline
NT
abs(const NT& x)
{
if (x < 0)
return -x;
return x;
}
template <class NT1, class NT2>
inline
Comparison_result
compare(const NT1& n1, const NT2& n2)
{ return (n1 < n2) ? SMALLER : (n2 < n1) ? LARGER : EQUAL; }
template <class NT>
inline
NT
square( const NT& n)
{ return n*n; }
template <class NT>
inline
NT
gcd( const NT& n1, const NT& n2)
{
CGAL_precondition(!CGAL_NTS is_zero(n2));
NT x = CGAL_NTS abs(n1);
NT y = CGAL_NTS abs(n2);
do {
x %= y;
if (CGAL_NTS is_zero(x)) return y;
y %= x;
} while (CGAL_NTS is_positive(y));
return x;
}
// for min and max see <CGAL/number_type_basic.h>
CGAL_END_NAMESPACE
#endif // CGAL_NUMBER_UTILS_H
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