// Copyright (c) 2006-2009 Inria Lorraine (France). All rights reserved.
//
// 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; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// 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: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/CGAL-3.6-branch/Algebraic_kernel_d/include/CGAL/RS/basic.h $
// $Id: basic.h 54380 2010-03-01 16:07:43Z penarand $
//
// Author: Luis Peņaranda <luis.penaranda@loria.fr>

#ifndef CGAL_RS_BASIC_H
#define CGAL_RS_BASIC_H

#include <CGAL/basic.h>
#include <CGAL/enum.h>

#ifndef CGAL_RS_VERB
#ifdef CGAL_RS_DEBUG
#define CGAL_RS_VERB    2
#else
#define CGAL_RS_VERB    0
#endif
#endif

// the default precision of RS to calculate a root (precision is 2^n)
#ifndef CGAL_RS_DEF_PREC
#define CGAL_RS_DEF_PREC        0
#endif

// the minimum, used when calculating a sign
#ifndef CGAL_RS_MIN_PREC
#define CGAL_RS_MIN_PREC        0
#endif

#if ( defined CGAL_HAS_THREADS && !defined CGAL_RS_NO_TLS )
#  ifdef _MSC_VER
#    ifdef _WINDLL
#      error "Can't build CGAL_RS as thread safe."
#      define CGALRS_THREAD_ATTR
#    else
#      define CGALRS_THREAD_ATTR __declspec(thread)
#    endif
#  else
#    define CGALRS_THREAD_ATTR __thread
#  endif
#else
#  define CGALRS_THREAD_ATTR
#endif

namespace CGAL{

enum rs_sign{
    RS_NEGATIVE=        NEGATIVE,
    RS_ZERO=            ZERO,
    RS_POSITIVE=        POSITIVE,
    RS_UNKNOWN
};

// this function must only be called when s is not RS_UNKNOWN
inline Sign convert_rs_sign(rs_sign s){
        CGAL_precondition(s!=RS_UNKNOWN);
        switch(s){
                case RS_NEGATIVE:return NEGATIVE;break;
                case RS_POSITIVE:return POSITIVE;break;
                default:return ZERO;
        }
}

} // namespace CGAL

#endif  // CGAL_RS_BASIC_H

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