mirror of https://github.com/CGAL/cgal
141 lines
3.4 KiB
C++
141 lines
3.4 KiB
C++
// Copyright (c) 2005 Stanford University (USA).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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//
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//
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// Author(s) : Daniel Russel <drussel@alumni.princeton.edu>
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#ifndef CGAL_POLYNOMIAL_TOOLS_INTERVAL_ARITHMETIC_H
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#define CGAL_POLYNOMIAL_TOOLS_INTERVAL_ARITHMETIC_H
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#include <CGAL/Polynomial/basic.h>
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#include <utility>
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/*!
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\file interval_arithmetic.h
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\todo wrapper support for boost::interval
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*/
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#ifdef CGAL_POLYNOMIAL_USE_CGAL
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#include <CGAL/Interval_nt.h>
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#include <CGAL/double.h>
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#include <CGAL/int.h>
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CGAL_POLYNOMIAL_BEGIN_NAMESPACE
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//! The class we use for interval arithmetic.
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/*!
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This class is not protected, so the Interval_arithmetic_guard must be used when calculations
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are peformed. This is not checked.
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*/
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typedef CGAL::Interval_nt_advanced Interval_nt;
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//! This class sets the rounding modes for interval arithmetic.
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/*!
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Create an instance of this class when you want to perform interval arithmetic.
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When the destructor is called, the mode will be automatically cleaned up.
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*/
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struct Interval_arithmetic_guard: public CGAL::Protect_FPU_rounding<true>{};
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/*struct Interval_arithmetic_guard {
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//! I should check that the rounding is not already upwards.
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Interval_arithmetic_guard() {
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bk_= FPU_get_and_set_cw(CGAL_FE_UPWARD);
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};
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Interval_arithmetic_guard(bool b) {
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if (b){
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bk_= FPU_get_and_set_cw(CGAL_FE_UPWARD);
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} else {
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bk_= CGAL_FE_UPWARD;
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}
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}
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~Interval_arithmetic_guard(){
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FPU_set_cw(bk_);
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}
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bool enabled() const {
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return bk_== CGAL_FE_UPWARD;
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}
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void set_enabled(bool ft) {
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if (ft != enabled()) {
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bk_= FPU_get_and_set_cw(bk_);
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}
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}
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protected:
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FPU_CW_t bk_;
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};*/
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template <class NT>
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class To_interval: public CGAL::To_interval<NT>
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{
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public:
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To_interval(){}
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};
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/*template <class NT>
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std::pair<double,double> to_interval(const NT&a){
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return CGAL::to_interval(a);
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}
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std::pair<double,double> to_interval(double d){
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return CGAL::to_interval(d);
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}*/
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//#define CGAL_POLYNOMIAL_TO_INTERVAL(nt) CGAL::to_interval(nt)
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/*template <class NT>
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std::pair<double, double> to_interval(const NT &nt){
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//bool to_interval_general;
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return CGAL::to_interval(nt);
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}*/
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//using CGAL::to_interval;
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namespace internal
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{
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template <class Traits> class Simple_interval_root;
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template <class R1, class R2> class Lazy_upper_bound_root_stack_root;
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template <class R> class Explicit_root;
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}
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CGAL_POLYNOMIAL_END_NAMESPACE
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#elif POLYNOMIAL_USE_BOOST_INTERVAL
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Not implemented yet.
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#else
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No interval arithmetic support.
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#endif
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CGAL_POLYNOMIAL_BEGIN_NAMESPACE
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inline Extended_sign extended_sign(const Interval_nt &i)
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{
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if (i.inf() == 0 && i.sup() ==0) return EXTENDED_ZERO;
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else if (i.inf() <=0 && i.sup() >=0) {
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return EXTENDED_UNKNOWN;
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}
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else if (i.inf() >0 ) {
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return EXTENDED_POSITIVE;
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}
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else {
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return EXTENDED_NEGATIVE;
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}
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}
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CGAL_POLYNOMIAL_END_NAMESPACE
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#endif
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