// Copyright (c) 2003 INRIA Sophia-Antipolis (France). // All rights reserved. // // This file is part of CGAL (www.cgal.org). // // $URL: https://github.com/CGAL/cgal/blob/v5.2/Apollonius_graph_2/include/CGAL/more_functions_on_signs.h $ // $Id: more_functions_on_signs.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot // SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial // // // Author(s) : Menelaos Karavelas #ifndef CGAL_MORE_FUNCTIONS_ON_SIGNS_H #define CGAL_MORE_FUNCTIONS_ON_SIGNS_H #include #include namespace CGAL { inline Sign sign_of_first_root(const Sign &sb, const Sign &sc) { // this method computes the sign of the second root of the quadratic // equation: a x^2 - b x + c == 0. It is assumed that the sign of a // is +1. if ( sc == NEGATIVE ) return NEGATIVE; if ( sb == POSITIVE ) return sc; if ( sb == NEGATIVE ) return NEGATIVE; return opposite(sc); } inline Sign sign_of_second_root(const Sign &sb, const Sign &sc) { // this method computes the sign of the first root of the quadratic // equation: a x^2 - b x + c == 0. It is assumed that the sign of a // is +1. if ( sc == NEGATIVE ) return POSITIVE; if ( sb == POSITIVE ) return POSITIVE; if ( sb == NEGATIVE ) return opposite(sc); return sc; } } //namespace CGAL #endif // CGAL_MORE_FUNCTIONS_ON_SIGNS_H