80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
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// Copyright (c) 2006-2007 Max-Planck-Institute Saarbruecken (Germany).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Algebraic_foundations/include/CGAL/Algebraic_extension_traits.h $
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// $Id: Algebraic_extension_traits.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Michael Hemmer <hemmer@mpi-inf.mpg.de>
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//
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// =============================================================================
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/*! \file CGAL/Algebraic_extension_traits.h
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* \brief Defines traits class CGAL::Algebraic_extension_traits.
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*/
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#ifndef CGAL_ALGEBRAIC_NUMBER_TRAITS_H
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#define CGAL_ALGEBRAIC_NUMBER_TRAITS_H 1
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#include <numeric> // for std::accumulate
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#include <CGAL/tags.h>
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#include <CGAL/Algebraic_structure_traits.h>
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namespace CGAL {
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template< class T >
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class Algebraic_extension_traits {
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public:
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//! \name Typedefs
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//! the number type for which this instance has been instantiated
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typedef T Type;
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//! standard number types are not extended
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typedef CGAL::Tag_false Is_extended;
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//! computes the factor which normalizes a number to be integral after
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// multiplication
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class Normalization_factor
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: public CGAL::cpp98::unary_function<Type,Type> {
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private:
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static Type
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normalization_factor(const Type&,Integral_domain_without_division_tag){
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return Type(1);
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}
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static Type
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normalization_factor(const Type& a, Field_tag){
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return Type(1)/a;
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}
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public:
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//! determine normalization factor
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Type operator () (const Type& a) {
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CGAL_precondition(a != Type(0));
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typedef typename Algebraic_structure_traits<Type>::Algebraic_category
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Tag;
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return normalization_factor(a, Tag());
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}
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};
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class Denominator_for_algebraic_integers
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: public CGAL::cpp98::unary_function<Type,Type> {
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public:
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//! determine normalization factor
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Type operator () (const Type&) {
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return Type(1);
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}
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template <class InputIterator>
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Type operator () (InputIterator, InputIterator) {
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return Type(1);
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}
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};
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};
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} //namespace CGAL
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#endif // NiX_ALGEBRAIC_NUMBER_TRAITS_H
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// EOF
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