/usr/include/CGAL/leda_bigfloat.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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// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel). 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) : Stefan Schirra, Michael Hemmer
#ifndef CGAL_LEDA_BIGFLOAT_H
#define CGAL_LEDA_BIGFLOAT_H
#include <CGAL/basic.h>
#ifdef CGAL_USE_LEDA
#include <utility>
#include <CGAL/leda_coercion_traits.h>
#include <CGAL/Interval_nt.h>
#include <CGAL/LEDA_basic.h>
#if CGAL_LEDA_VERSION < 500
#include <LEDA/bigfloat.h>
#else
#include <LEDA/numbers/bigfloat.h>
#endif
namespace CGAL {
template <> class Algebraic_structure_traits< leda_bigfloat >
: public Algebraic_structure_traits_base< leda_bigfloat,
Field_with_kth_root_tag > {
public:
typedef Tag_false Is_exact;
typedef Tag_true Is_numerical_sensitive;
class Sqrt
: public std::unary_function< Type, Type > {
public:
Type operator()( const Type& x ) const {
return CGAL_LEDA_SCOPE::sqrt( x );
}
};
class Kth_root
: public std::binary_function<int, Type, Type> {
public:
Type operator()( int k,
const Type& x) const {
CGAL_precondition_msg(k > 0, "'k' must be positive for k-th roots");
// heuristic: we ask for as many precision as the argument has
long d = x.get_significant_length();
if ( d < 53) // O.K. we want at least double precision
d = 53;
return CGAL_LEDA_SCOPE::sqrt_d( x, d, k);
}
};
};
template <> class Real_embeddable_traits< leda_bigfloat >
: public INTERN_RET::Real_embeddable_traits_base< leda_bigfloat , CGAL::Tag_true > {
public:
class Abs
: public std::unary_function< Type, Type > {
public:
Type operator()( const Type& x ) const {
return CGAL_LEDA_SCOPE::abs( x );
}
};
class Sgn
: public std::unary_function< Type, ::CGAL::Sign > {
public:
::CGAL::Sign operator()( const Type& x ) const {
return (::CGAL::Sign) CGAL_LEDA_SCOPE::sign( x );
}
};
class Compare
: public std::binary_function< Type, Type,
Comparison_result > {
public:
Comparison_result operator()( const Type& x,
const Type& y ) const {
return (Comparison_result) CGAL_LEDA_SCOPE::compare( x, y );
}
CGAL_IMPLICIT_INTEROPERABLE_BINARY_OPERATOR_WITH_RT( Type,
Comparison_result )
};
class To_double
: public std::unary_function< Type, double > {
public:
double operator()( const Type& x ) const {
return x.to_double();
}
};
class To_interval
: public std::unary_function< Type, std::pair< double, double > > {
public:
std::pair<double, double> operator()( const Type& x ) const {
// assuming leda_bigfloat guarantee 1 bit error max
Protect_FPU_rounding<true> P (CGAL_FE_TONEAREST);
Interval_nt_advanced approx (CGAL_LEDA_SCOPE::to_double(x));
FPU_set_cw(CGAL_FE_UPWARD);
approx += Interval_nt<false>::smallest();
return approx.pair();
}
};
class Is_finite
: public std::unary_function< Type, bool > {
public:
bool operator()( const Type& x ) const {
return !( CGAL_LEDA_SCOPE::isInf(x) || CGAL_LEDA_SCOPE::isNaN(x) );
}
};
};
template<>
class Is_valid< leda_bigfloat >
: public std::unary_function< leda_bigfloat, bool > {
public :
bool operator()( const leda_bigfloat& x ) const {
return !( CGAL_LEDA_SCOPE::isNaN(x) );
}
};
} //namespace CGAL
// Unary + is missing for leda::bigfloat
namespace leda {
inline bigfloat operator+( const bigfloat& i) { return i; }
} // namespace leda
//since types are included by leda_coercion_traits.h:
#include <CGAL/leda_integer.h>
#include <CGAL/leda_rational.h>
#include <CGAL/leda_bigfloat.h>
#include <CGAL/leda_real.h>
#include <CGAL/LEDA_arithmetic_kernel.h>
#endif // CGAL_USE_LEDA
#endif // CGAL_LEDA_BIGFLOAT_H
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