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