/usr/include/CGAL/Polynomial/hgdelta_update.h is in libcgal-dev 4.2-5ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | // 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.
//
// $URL$
// $Id$
//
//
// 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
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