// Copyright (c) 1999
// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel).  All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Kernel_23/include/CGAL/predicates/sign_of_determinant.h $
// $Id: include/CGAL/predicates/sign_of_determinant.h b26b07a1242 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s)     : Sylvain Pion
//                 Stefan Schirra

#ifndef CGAL_PREDICATES_SIGN_OF_DETERMINANT_H
#define CGAL_PREDICATES_SIGN_OF_DETERMINANT_H

#include <CGAL/determinant.h>
#include <CGAL/number_utils_classes.h>
#include <CGAL/number_type_basic.h>

namespace CGAL {

template <class RT>
inline
typename Sgn<RT>::result_type
sign_of_determinant( const RT& a00,  const RT& a01,
                        const RT& a10,  const RT& a11)
{
  typedef typename Sgn<RT>::result_type Sign;
  return enum_cast<Sign>(CGAL_NTS compare( a00*a11, a10*a01));
}

template <class RT>
inline
typename Sgn<RT>::result_type
sign_of_determinant( const RT& a00,  const RT& a01,  const RT& a02,
                        const RT& a10,  const RT& a11,  const RT& a12,
                        const RT& a20,  const RT& a21,  const RT& a22)
{
  return CGAL_NTS sign(determinant(a00, a01, a02,
                                         a10, a11, a12,
                                         a20, a21, a22));
}

template <class RT>
inline
typename Sgn<RT>::result_type
sign_of_determinant(
 const RT& a00,  const RT& a01,  const RT& a02,  const RT& a03,
 const RT& a10,  const RT& a11,  const RT& a12,  const RT& a13,
 const RT& a20,  const RT& a21,  const RT& a22,  const RT& a23,
 const RT& a30,  const RT& a31,  const RT& a32,  const RT& a33)
{
  return CGAL_NTS sign(determinant(a00, a01, a02, a03,
                                         a10, a11, a12, a13,
                                         a20, a21, a22, a23,
                                         a30, a31, a32, a33));
}

template <class RT>
CGAL_KERNEL_LARGE_INLINE
typename Sgn<RT>::result_type
sign_of_determinant(
 const RT& a00,  const RT& a01,  const RT& a02,  const RT& a03,  const RT& a04,
 const RT& a10,  const RT& a11,  const RT& a12,  const RT& a13,  const RT& a14,
 const RT& a20,  const RT& a21,  const RT& a22,  const RT& a23,  const RT& a24,
 const RT& a30,  const RT& a31,  const RT& a32,  const RT& a33,  const RT& a34,
 const RT& a40,  const RT& a41,  const RT& a42,  const RT& a43,  const RT& a44)
{
  return CGAL_NTS sign(determinant(a00, a01, a02, a03, a04,
                                         a10, a11, a12, a13, a14,
                                         a20, a21, a22, a23, a24,
                                         a30, a31, a32, a33, a34,
                                         a40, a41, a42, a43, a44));
}

template <class RT>
CGAL_KERNEL_LARGE_INLINE
typename Sgn<RT>::result_type
sign_of_determinant(
 const RT& a00, const RT& a01, const RT& a02, const RT& a03, const RT& a04,
 const RT& a05,
 const RT& a10, const RT& a11, const RT& a12, const RT& a13, const RT& a14,
 const RT& a15,
 const RT& a20, const RT& a21, const RT& a22, const RT& a23, const RT& a24,
 const RT& a25,
 const RT& a30, const RT& a31, const RT& a32, const RT& a33, const RT& a34,
 const RT& a35,
 const RT& a40, const RT& a41, const RT& a42, const RT& a43, const RT& a44,
 const RT& a45,
 const RT& a50, const RT& a51, const RT& a52, const RT& a53, const RT& a54,
 const RT& a55)
{
  return CGAL_NTS sign(determinant(a00, a01, a02, a03, a04, a05,
                                         a10, a11, a12, a13, a14, a15,
                                         a20, a21, a22, a23, a24, a25,
                                         a30, a31, a32, a33, a34, a35,
                                         a40, a41, a42, a43, a44, a45,
                                         a50, a51, a52, a53, a54, a55));
}

} //namespace CGAL

#endif // CGAL_PREDICATES_SIGN_OF_DETERMINANT_H

