mirror of https://github.com/CGAL/cgal
123 lines
2.8 KiB
C++
123 lines
2.8 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_INTERNAL_DERIVATIVE_H
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#define CGAL_POLYNOMIAL_INTERNAL_DERIVATIVE_H
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#include <CGAL/Polynomial/basic.h>
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#include <iterator>
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CGAL_POLYNOMIAL_BEGIN_INTERNAL_NAMESPACE
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template <class Fn>
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struct Derivative
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{
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private:
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typedef typename Fn::iterator Cit;
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struct It
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{
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It(Cit it, int i): i_(i), cit_(it) {}
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It(){}
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typedef typename Fn::iterator MCit;
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typedef typename std::iterator_traits<MCit> Traits;
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typedef typename Traits::iterator_category iterator_category;
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typedef typename Traits::value_type value_type;
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typedef typename Traits::pointer pointer;
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typedef typename Traits::reference reference;
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typedef typename Traits::difference_type difference_type;
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value_type operator*() const
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{
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return value_type(i_)**cit_;
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}
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pointer operator->() const
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{
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return value_type(i_)**cit_;
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}
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bool operator<(It o) const
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{
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return cit_ < o.cit_;
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}
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It operator++() {
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++i_;
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++cit_;
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return *this;
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}
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It operator++(int) {
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It t=*this;
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++i_;
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++cit_;
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return t;
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}
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It operator--() {
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--i_;
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--cit_;
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return *this;
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}
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It operator--(int) {
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It t=*this;
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--i_;
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--cit_;
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return t;
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}
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bool operator==(It o) const
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{
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return cit_ == o.cit_;
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}
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bool operator!=(It o) const
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{
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return cit_ != o.cit_;
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}
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difference_type operator-(It o) const
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{
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return cit_-o.cit_;
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}
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It operator+=(difference_type i) {
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cit_+= i;
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i_+= i;
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return *this;
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}
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protected:
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int i_;
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MCit cit_;
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};
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public:
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typedef Fn result_type;
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typedef Fn argument_type;
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result_type operator()(const argument_type &o) const
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{
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if (o.is_constant()) { return result_type(typename result_type::NT(0)); }
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else {
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It b(o.begin(),0);
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++b;
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return result_type(b, It(o.end(), o.degree()+1));
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}
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}
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void write(std::ostream &out) const
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{
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out << "diff";
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}
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};
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CGAL_POLYNOMIAL_END_INTERNAL_NAMESPACE
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#endif
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