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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
// SPDX-FileCopyrightText: Copyright © DUNE Project contributors, see file AUTHORS.md
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception OR LGPL-3.0-or-later
#ifndef DUNE_FUNCTIONS_GRIDFUNCTIONS_LOCALDERIVATIVE_TRAITS_HH
#define DUNE_FUNCTIONS_GRIDFUNCTIONS_LOCALDERIVATIVE_TRAITS_HH
#include <dune/functions/common/defaultderivativetraits.hh>
namespace Dune {
namespace Functions {
/**
* \brief Derivative traits for local functions.
*
* \ingroup FunctionUtility
*
* This provides derivative traits to be used by local functions with
* given `EntitySet` and global `DerivativeTraits`.
*
* The reason why this is needed is that local functions return
* derivatives wrt to global coordinates although the arguments
* for these derivatives are local coordinates.
*/
template<class EntitySet, template<class> class DerivativeTraits=DefaultDerivativeTraits>
struct LocalDerivativeTraits
{
using LocalDomain = typename EntitySet::LocalCoordinate;
using Domain = typename EntitySet::GlobalCoordinate;
template<class Signature>
struct Traits
{
typedef InvalidRange Range;
};
template<class R>
struct Traits<R(LocalDomain)>
{
using Range = typename DerivativeTraits<R(Domain)>::Range;
};
};
}} // namespace Dune::Functions
#endif // DUNE_FUNCTIONS_GRIDFUNCTIONS_LOCALDERIVATIVE_TRAITS_HH
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