/usr/include/CGAL/Gmpzf.h is in libcgal-dev 4.2-5ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// 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; either version 3 of the License,
// or (at your option) any later version.
//
// 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.
//
// $URL$
// $Id$
//
//
// Author(s) : Michael Hemmer <hemmer@mpi-inf.mpg.de>
#ifndef CGAL_GMPZF_H
#define CGAL_GMPZF_H
// includes
#include <CGAL/number_type_basic.h>
#include <CGAL/Gmp_coercion_traits.h>
#include <CGAL/Gmpz.h>
#include <CGAL/Interval_nt.h>
namespace CGAL {
// Algebraic structure traits
template <> class Algebraic_structure_traits< Gmpzf >
: public Algebraic_structure_traits_base< Gmpzf, Euclidean_ring_tag > {
public:
typedef Tag_true Is_exact;
struct Is_zero
: public std::unary_function< Type, bool > {
public:
bool operator()( const Type& x ) const {
return x.is_zero();
}
};
struct Integral_division
: public std::binary_function< Type,
Type,
Type > {
public:
Type operator()(
const Type& x,
const Type& y ) const {
return x.integral_division(y);
}
};
struct Gcd
: public std::binary_function< Type,
Type,
Type > {
public:
Type operator()(
const Type& x,
const Type& y ) const {
return x.gcd(y);
}
CGAL_IMPLICIT_INTEROPERABLE_BINARY_OPERATOR(int)
};
class Div
: public std::binary_function< Type, Type, Type > {
public:
Type operator()( const Type& x, const Type& y ) const {
return Type(x).div( y );
}
};
typedef INTERN_AST::Mod_per_operator< Type > Mod;
class Is_square
: public std::binary_function< Type, Type&, bool > {
public:
bool operator()( const Type& x, Type& y ) const {
y = CGAL::approximate_sqrt(x);
return y * y == x;
}
bool operator()( const Type& x) const {
Type dummy;
return operator()(x,dummy);
}
};
};
// Real embeddable traits
template <>
class Real_embeddable_traits< Gmpzf >
: public INTERN_RET::Real_embeddable_traits_base< Gmpzf , CGAL::Tag_true > {
typedef Algebraic_structure_traits<Gmpzf> AST;
public:
typedef AST::Is_zero Is_zero;
struct Sgn
: public std::unary_function< Type, ::CGAL::Sign > {
public:
::CGAL::Sign operator()( const Type& x ) const {
return x.sign();
}
};
struct Compare
: public std::binary_function< Type,
Type,
Comparison_result > {
public:
Comparison_result operator()(
const Type& x,
const Type& y ) const {
return x.compare(y);
}
};
struct To_double
: public std::unary_function< Type, double > {
public:
double operator()( const Type& x ) const {
return x.to_double();
}
};
struct To_interval
: public std::unary_function< Type, std::pair< double, double > > {
public:
std::pair<double, double> operator()( const Type& x ) const {
return x.to_interval();
}
};
};
// specialization of to double functor
template<>
class Real_embeddable_traits< Quotient<Gmpzf> >
: public
INTERN_QUOTIENT::Real_embeddable_traits_quotient_base< Quotient<Gmpzf> >
{
public:
struct To_double: public std::unary_function<Quotient<Gmpzf>, double>{
inline
double operator()(const Quotient<Gmpzf>& q) const {
std::pair<double, long> n = q.numerator().to_double_exp();
std::pair<double, long> d = q.denominator().to_double_exp();
double scale = std::ldexp(1.0, n.second - d.second);
return (n.first / d.first) * scale;
}
};
struct To_interval
: public std::unary_function<Quotient<Gmpzf>, std::pair<double,double> >{
inline
std::pair<double,double> operator()(const Quotient<Gmpzf>& q) const {
// do here as MP_Float does
std::pair<std::pair<double, double>, long> n =
q.numerator().to_interval_exp();
std::pair<std::pair<double, double>, long> d =
q.denominator().to_interval_exp();
CGAL_assertion_msg(CGAL::abs(1.0*n.second - d.second) < (1<<30)*2.0,
"Exponent overflow in Quotient<MP_Float> to_interval");
return ldexp(Interval_nt<>(n.first) / Interval_nt<>(d.first),
n.second - d.second).pair();
}
};
};
} //namespace CGAL
//since types are included by Gmp_coercion_traits.h:
#include <CGAL/Gmpz.h>
#include <CGAL/Gmpq.h>
#include <CGAL/Gmpzf.h>
#endif // CGAL_GMPZF_H
// ===== EOF ==================================================================
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