/usr/include/CGAL/leda_coercion_traits.h is in libcgal-dev 4.2-5ubuntu1.
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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>
/*! \file NiX/LEDA/Coercion_traits.h
* \brief Provides specializations of Coercion_traits for the LEDA number types.
*/
#ifndef CGAL_LEDA_COERCION_TRAITS_H
#define CGAL_LEDA_COERCION_TRAITS_H
#include <CGAL/number_type_basic.h>
#ifdef CGAL_USE_LEDA
#include <CGAL/LEDA_basic.h>
#if CGAL_LEDA_VERSION < 500
#include <LEDA/integer.h>
#include <LEDA/bigfloat.h>
#include <LEDA/rational.h>
#include <LEDA/real.h>
#else
#include <LEDA/numbers/integer.h>
#include <LEDA/numbers/bigfloat.h>
#include <LEDA/numbers/rational.h>
#include <LEDA/numbers/real.h>
#endif
namespace CGAL {
//LEDA internal coercions:
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(::leda::integer,::leda::bigfloat)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(::leda::integer,::leda::rational)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(::leda::integer,::leda::real)
// CGAL_DEFINE_COERCION_TRAITS_FROM_TO(::leda::bigfloat,::leda::rational); see below
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(::leda::bigfloat,::leda::real)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(::leda::rational,::leda::real)
// The following definitions reflect the interaction of the LEDA number types
// with the built in types,
// leda integer:
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(short ,::leda::integer)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(int ,::leda::integer)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(long ,::leda::integer)
// leda rational:
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(short ,::leda::rational)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(int ,::leda::rational)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(long ,::leda::rational)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(float ,::leda::rational)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(double ,::leda::rational)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(long double,::leda::rational)
// leda bigfloat: :
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(short ,::leda::bigfloat)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(int ,::leda::bigfloat)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(long ,::leda::bigfloat)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(float ,::leda::bigfloat)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(double ,::leda::bigfloat)
// leda real:
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(short ,::leda::real)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(int ,::leda::real)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(float ,::leda::real)
CGAL_DEFINE_COERCION_TRAITS_FROM_TO(double ,::leda::real)
//not provided by LEDA
//Note that this is not symmetric to CORE
//CGAL_DEFINE_COERCION_TRAITS_FROM_TO(long long,::leda::integer);
//CGAL_DEFINE_COERCION_TRAITS_FROM_TO(long long,::leda::rational);
//CGAL_DEFINE_COERCION_TRAITS_FROM_TO(long long ,::leda::bigfloat);
//CGAL_DEFINE_COERCION_TRAITS_FROM_TO(long double,::leda::bigfloat);
//CGAL_DEFINE_COERCION_TRAITS_FROM_TO(long ,::leda::real);
//CGAL_DEFINE_COERCION_TRAITS_FROM_TO(long long ,::leda::real);
//CGAL_DEFINE_COERCION_TRAITS_FROM_TO(long double,::leda::real);
template <>
struct Coercion_traits< ::leda::bigfloat ,::leda::rational >{
typedef Tag_true Are_explicit_interoperable;
typedef Tag_false Are_implicit_interoperable;
typedef ::leda::rational Type;
struct Cast{
typedef Type result_type;
Type operator()(const ::leda::rational& x) const { return x;}
Type operator()(const ::leda::bigfloat& x) const {
#if CGAL_LEDA_VERSION < 500
::leda::integer e = x.get_exponent();
::leda::integer s = x.get_significant();
if(e<0) {
::leda::bigfloat b_two_to_e = ::leda::ipow2(-e);
::leda::integer two_to_e = ::leda::floor(b_two_to_e);
return ::leda::rational(s,two_to_e);
}
// e >= 0
::leda::bigfloat b_two_to_e = ::leda::ipow2(e);
::leda::integer two_to_e = ::leda::floor(b_two_to_e);
return ::leda::rational(s * two_to_e);
#else
return x.to_rational();
#endif
}
};
};
template <> struct Coercion_traits< ::leda::rational, ::leda::bigfloat >
:public Coercion_traits< ::leda::bigfloat , ::leda::rational >{};
} //namespace CGAL
#endif // CGAL_USE_LEDA
#endif //CGAL_LEDA_COERCION_TRAITS_H
//EOF
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