45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
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// Copyright (c) 2008 Max-Planck-Institute Saarbruecken (Germany)
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Polynomial/include/CGAL/Polynomial/hgdelta_update.h $
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// $Id: hgdelta_update.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Michael Hemmer
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// ============================================================================
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// TODO: The comments are all original EXACUS comments and aren't adapted. So
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// they may be wrong now.
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#ifndef CGAL_POLYNOMIAL_HGDELTA_UPDATE_H
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#define CGAL_POLYNOMIAL_HGDELTA_UPDATE_H
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namespace CGAL {
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// This subroutine has been retained here for use in both new files.
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namespace internal {
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template <class NT> inline
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void hgdelta_update(NT& h, const NT& g, int delta) {
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typename Algebraic_structure_traits<NT>::Integral_division idiv;
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// compute h = h^(1-delta) * g^delta
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switch (delta) {
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case 0:
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// h = h;
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break;
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case 1:
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h = g;
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break;
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default:
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h = idiv(CGAL::ipower(g, delta), CGAL::ipower(h, delta-1));
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break;
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}
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}
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} // namespace internal
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} //namespace CGAL
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#endif // CGAL_POLYNOMIAL_HGDELTA_UPDATE_H
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