/usr/include/dune/functions/common/defaultderivativetraits.hh is in libdune-functions-dev 2.5.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_FUNCTIONS_COMMON_DEFAULT_DERIVATIVE_TRAITS_HH
#define DUNE_FUNCTIONS_COMMON_DEFAULT_DERIVATIVE_TRAITS_HH
#include <type_traits>
#include <utility>
#include <dune/common/fvector.hh>
#include <dune/common/fmatrix.hh>
namespace Dune {
namespace Functions {
/**
* \brief Dummy range class to be used if no proper type is available
*
* \ingroup FunctionUtility
*/
class InvalidRange
{};
/**
* \brief Default implementation for derivative traits
*
* \ingroup FunctionUtility
*
* This class provides sensible defaults for the range
* of derivatives of functions with some common \p Domain
* and \p Range types.
*/
template<class Signature>
struct DefaultDerivativeTraits
{
//! Range of derivative for function with given signature
typedef InvalidRange Range;
};
/**
* \brief Default implementation for derivative traits
*
* \ingroup FunctionUtility
*
* Specialization for Signature = double(double)
*/
template<>
struct DefaultDerivativeTraits< double(double) >
{
//! \copydoc DefaultDerivativeTraits::Range
typedef double Range;
};
/**
* \brief Default implementation for derivative traits
*
* \ingroup FunctionUtility
*
* \tparam K Scalar range type
*
* Specialization for Signature = K(FieldVector<K,n>)
*/
template<typename K, int n>
struct DefaultDerivativeTraits<K(FieldVector<K,n>)>
{
//! \copydoc DefaultDerivativeTraits::Range
typedef FieldVector<K,n> Range;
};
/**
* \brief Default implementation for derivative traits
*
* \ingroup FunctionUtility
*
* \tparam K Scalar range type
*
* Specialization for Signature = FieldVector<K,m>(FieldVector<K,n>)
*/
template<typename K, int n, int m>
struct DefaultDerivativeTraits<FieldVector<K,m>(FieldVector<K,n>)>
{
//! \copydoc DefaultDerivativeTraits::Range
typedef FieldMatrix<K,m,n> Range;
};
/**
* \brief Default implementation for derivative traits
*
* \ingroup FunctionUtility
*
* \tparam K Scalar range type
*
* Specialization for Signature = FieldMatrix<K,1,m>(FieldVector<K,n>)
*/
template<typename K, int n, int m>
struct DefaultDerivativeTraits<FieldMatrix<K,1,m>(FieldVector<K,n>)>
{
//! \copydoc DefaultDerivativeTraits::Range
typedef FieldMatrix<K,m,n> Range;
};
}} // namespace Dune::Functions
#endif // DUNE_FUNCTIONS_COMMON_DEFAULT_DERIVATIVE_TRAITS_HH
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