54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
|
// Copyright (c) 2008 Max-Planck-Institute Saarbruecken (Germany)
|
||
|
|
//
|
||
|
|
// 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; either version 3 of the License,
|
||
|
|
// or (at your option) any later version.
|
||
|
|
//
|
||
|
|
// 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.
|
||
|
|
//
|
||
|
|
// $URL$
|
||
|
|
// $Id$
|
||
|
|
// SPDX-License-Identifier: LGPL-3.0+
|
||
|
|
//
|
||
|
|
//
|
||
|
|
// Author(s) : Michael Hemmer
|
||
|
|
// ============================================================================
|
||
|
|
|
||
|
|
// TODO: The comments are all original EXACUS comments and aren't adapted. So
|
||
|
|
// they may be wrong now.
|
||
|
|
|
||
|
|
#ifndef CGAL_POLYNOMIAL_HGDELTA_UPDATE_H
|
||
|
|
#define CGAL_POLYNOMIAL_HGDELTA_UPDATE_H
|
||
|
|
|
||
|
|
namespace CGAL {
|
||
|
|
|
||
|
|
// This subroutine has been retained here for use in both new files.
|
||
|
|
namespace internal {
|
||
|
|
template <class NT> inline
|
||
|
|
void hgdelta_update(NT& h, const NT& g, int delta) {
|
||
|
|
typename Algebraic_structure_traits<NT>::Integral_division idiv;
|
||
|
|
|
||
|
|
// compute h = h^(1-delta) * g^delta
|
||
|
|
switch (delta) {
|
||
|
|
case 0:
|
||
|
|
// h = h;
|
||
|
|
break;
|
||
|
|
case 1:
|
||
|
|
h = g;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
h = idiv(CGAL::ipower(g, delta), CGAL::ipower(h, delta-1));
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} // namespace internal
|
||
|
|
|
||
|
|
} //namespace CGAL
|
||
|
|
|
||
|
|
#endif // CGAL_POLYNOMIAL_HGDELTA_UPDATE_H
|