/usr/include/dune/localfunctions/utility/field.hh is in libdune-localfunctions-dev 2.2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#define DUNE_LOCALFUNCTIONS_UTILITY_FIELD_HH
#if HAVE_ALGLIB
#include <alglib/amp.h>
#warning ALGLIB support is deprecated and will be dropped after DUNE 2.2 (cf. FS#931)
#endif
#include <dune/common/gmpfield.hh>
#include <dune/common/fvector.hh>
#include <dune/common/fmatrix.hh>
namespace Dune
{
// Unity
// -----
/**
* @brief A class representing the unit of a given Field
*
* This class can be used to assign the unit element to an
* instance of a given Field also operators for +/- with
* unit element are provided. Also 1/f can be evaluated.
* Through specialization this class can be used also in the case that the
* integer 1 is not automatically converted to the unit
* element of the Field - the default implementation
**/
template< class Field >
struct Unity
{
operator Field () const
{
return Field( 1 );
}
};
template< class Field >
Field operator+ ( const Unity< Field > &u, const Field &f )
{
return (Field)u + f;
}
template< class Field >
Field operator- ( const Unity< Field > &u, const Field &f )
{
return (Field)u - f;
}
template< class Field >
Field operator* ( const Unity< Field > &u, const Field &f )
{
return f;
}
template< class Field >
Field operator/ ( const Unity< Field > &u, const Field &f )
{
return (Field)u / f;
}
// Zero
// ----
/**
* @brief A class representing the zero of a given Field
*
* This class can be used to assign the zero element to an
* instance of a given Field. An epsilon is also
* provided for the comparison operators.
* This class can be used also in the case that the
* integer 0 is not automatically converted to the zero
* element of the Field and the epsilon can be changed
* depending on the accuracy of the Field type.
**/
template< class Field >
struct Zero
{
operator Field () const
{
return Field( 0 );
}
static const Field epsilon()
{
return Field(1e-12);
}
};
#if HAVE_ALGLIB
template< unsigned int precision >
struct Zero< amp::ampf< precision > >
{
typedef amp::ampf< precision > Field;
operator Field () const
{
return Field( 0 );
}
static const Field epsilon()
{
return Field(1e-20);
}
};
#endif
#if HAVE_GMP
template< unsigned int precision >
struct Zero< GMPField< precision > >
{
typedef GMPField< precision > Field;
operator Field () const
{
return Field( 0 );
}
static const Field epsilon()
{
return Field(1e-20);
}
};
#endif
template< class Field >
inline bool operator == ( const Zero< Field > &, const Field &f )
{
return ( f < Zero<Field>::epsilon() && f > -Zero<Field>::epsilon() );
}
template< class Field >
inline bool operator == ( const Field &f, const Zero< Field > &z)
{
return ( z == f );
}
template< class Field >
inline bool operator< ( const Zero< Field > &, const Field &f )
{
return f > Zero<Field>::epsilon();
}
template< class Field >
inline bool operator< ( const Field &f, const Zero< Field > & )
{
return f < -Zero<Field>::epsilon();
}
template< class Field >
inline bool operator> ( const Zero< Field > &z, const Field &f )
{
return f < z;
}
template< class Field >
inline bool operator> ( const Field &f, const Zero< Field > &z )
{
return z < f;
}
// field_cast
// ----------
/**
* @brief a helper class to cast from one field
* to another
*
* This cast can be used for assignement between
* different field types, including for example
* between FieldVectors with different fields.
* Specially the conversion from a special type
* e.g. gmp to build in types are provided, the
* other direction can be more easily handled by
* the special field type implementation.
**/
template< class F2, class F1 >
inline void field_cast ( const F1 &f1, F2 &f2 )
{
f2 = f1;
}
#if HAVE_ALGLIB
template< unsigned int precision >
inline void field_cast ( const amp::ampf< precision > &f1, double &f2 )
{
f2 = f1.toDouble();
}
template< unsigned int precision >
inline void field_cast ( const amp::ampf< precision > &f1, long double &f2 )
{
f2 = f1.toDouble();
}
#endif
#if HAVE_GMP
template< unsigned int precision >
inline void field_cast ( const Dune::GMPField< precision > &f1, double &f2 )
{
f2 = f1.get_d();
}
template< unsigned int precision >
inline void field_cast ( const Dune::GMPField< precision > &f1, long double &f2 )
{
f2 = f1.get_d();
}
#endif
template< class F2, class F1, int dim >
inline void field_cast ( const Dune::FieldVector< F1, dim > &f1, Dune::FieldVector< F2, dim > &f2 )
{
for( int d = 0; d < dim; ++d )
field_cast( f1[ d ], f2[ d ] );
}
template< class F2, class F1 >
inline void field_cast ( const Dune::FieldVector< F1, 1 > &f1, F2 &f2 )
{
field_cast( f1[ 0 ], f2 );
}
template< class F2, class F1 >
inline void field_cast ( const F1 &f1, Dune::FieldVector< F2, 1 > &f2 )
{
field_cast( f1, f2[ 0 ] );
}
template< class F2, class F1, int rdim, int cdim >
inline void field_cast ( const Dune::FieldMatrix< F1, rdim, cdim > &f1, Dune::FieldMatrix< F2, rdim, cdim > &f2 )
{
for( int r = 0; r < rdim; ++r )
field_cast( f1[ r ], f2[ r ] );
}
template< class F2, class F1 >
inline void field_cast ( const Dune::FieldMatrix<F1,1,1> &f1, Dune::FieldMatrix< F2, 1,1 > &f2 )
{
field_cast( f1[ 0 ][ 0 ], f2[ 0 ][ 0 ] );
}
template< class F2, class F1 >
inline void field_cast ( const Dune::FieldMatrix< F1, 1,1 > &f1, F2 &f2 )
{
field_cast( f1[ 0 ][ 0 ], f2 );
}
template< class F2, class F1 >
inline void field_cast ( const F1 &f1, Dune::FieldMatrix< F2, 1,1 > &f2 )
{
field_cast( f1, f2[ 0 ][ 0 ] );
}
template< class F2, class F1 >
inline void field_cast ( const Dune::FieldVector<F1,1> &f1, Dune::FieldMatrix< F2, 1,1 > &f2 )
{
field_cast( f1[ 0 ], f2[ 0 ][ 0 ] );
}
template< class F2, class F1 >
inline void field_cast ( const Dune::FieldMatrix<F1,1,1> &f1, Dune::FieldVector< F2, 1 > &f2 )
{
field_cast( f1[ 0 ][ 0 ], f2[ 0 ] );
}
template< class F2, class F1 >
inline void field_cast ( const Dune::FieldVector< F1, 1 > &f1, Dune::FieldVector<F2, 1> &f2 )
{
field_cast( f1[ 0 ], f2[ 0 ] );
}
template< class F2,class V >
struct FieldCast
{
typedef F2 type;
};
template< class F2,class F1,int dim >
struct FieldCast< F2, Dune::FieldVector<F1,dim> >
{
typedef Dune::FieldVector<F2,dim> type;
};
template< class F2,class F1,int dim1, int dim2>
struct FieldCast< F2, Dune::FieldMatrix<F1,dim1,dim2> >
{
typedef Dune::FieldMatrix<F2,dim1,dim2> type;
};
template< class F2,class V >
inline typename FieldCast<F2,V>::type field_cast ( const V &f1 )
{
typename FieldCast<F2,V>::type f2;
field_cast( f1, f2 );
return f2;
}
// Precision
// this is not a perfect solution to obtain the
// precision of a field - definition is not clear
// to be removed
// ---------
template <class Field>
struct Precision;
template<>
struct Precision< double >
{
static const unsigned int value = 64;
};
template<>
struct Precision< long double >
{
static const unsigned int value = 80;
};
template<>
struct Precision< float >
{
static const unsigned int value = 32;
};
#if HAVE_ALGLIB
template< unsigned int precision >
struct Precision< amp::ampf< precision > >
{
static const unsigned int value = precision;
};
#endif
#if HAVE_GMP
template< unsigned int precision >
struct Precision< GMPField< precision > >
{
static const unsigned int value = precision;
};
#endif
// ComputeField
// ------------
template <class Field,unsigned int sum>
struct ComputeField
{
typedef Field Type;
};
#if HAVE_ALGLIB
template< unsigned int precision, unsigned int sum >
struct ComputeField< amp::ampf< precision >, sum >
{
typedef amp::ampf<precision+sum> Type;
};
#endif
#if HAVE_GMP
template< unsigned int precision, unsigned int sum >
struct ComputeField< GMPField< precision >, sum >
{
typedef GMPField<precision+sum> Type;
};
#endif
} // namespace Dune
// to be moved to different location...
namespace std
{
#if HAVE_ALGLIB
template< unsigned int precision >
inline ostream &
operator<< ( ostream &out,
const amp::ampf< precision > &value )
{
return out << value.toDec();
}
template< unsigned int precision >
inline amp::ampf< precision > sqrt ( const amp::ampf< precision > &a )
{
return amp::sqrt( a );
}
template< unsigned int precision >
inline amp::ampf< precision > abs ( const amp::ampf< precision > &a )
{
return amp::abs( a );
}
#endif // #if HAVE_ALGLIB
} // namespace std
namespace Dune
{
namespace GenericGeometry
{
// FieldHelper
// -----------
template< class Field >
struct FieldHelper;
#if HAVE_ALGLIB
template< unsigned int precision >
struct FieldHelper< amp::ampf< precision > >
{
typedef amp::ampf< precision > Field;
static Field abs ( const Field &x ) { return amp::abs( x ); }
};
#endif // #if HAVE_ALGLIB
} // namespace GenericGeometry
} // namespace Dune
#endif // #ifndef DUNE_LOCALFUNCTIONS_UTILITY_FIELD_HH
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