griddiscretization.hh

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// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
// vi: set et ts=4 sw=4 sts=4:
//
// SPDX-FileCopyrightText: Copyright © DuMux Project contributors, see AUTHORS.md in root folder
// SPDX-License-Identifier: GPL-3.0-or-later
//
#ifndef DUMUX_TYPETRAITS_GRID_DISCRETIZATION_HH
#define DUMUX_TYPETRAITS_GRID_DISCRETIZATION_HH
 
#include <utility>
 
#include <dumux/common/typetraits/typetraits.hh>
 
namespace Dumux {
 
#ifndef DOXYGEN
namespace Detail {
 
template<class T>
struct GridDiscretizationType
{
    static_assert(AlwaysFalse<T>::value, "Type exports neither GridGeometry nor GridDiscretization");
};

template<class T>
    requires requires { typename T::GridGeometry; }
struct GridDiscretizationType<T>
{ using type = typename T::GridGeometry; };

template<class T>
    requires (requires { typename T::GridDiscretization; }
              && !requires { typename T::GridGeometry; })
struct GridDiscretizationType<T>
{ using type = typename T::GridDiscretization; };
 
} // end namespace Detail
#endif // DOXYGEN

template<class T>
using GridDiscretization_t = typename Detail::GridDiscretizationType<T>::type;

template<class T, class... Args>
decltype(auto) gridDiscretization(const T& t, Args&&... args)
{
    if constexpr (requires { t.gridDiscretization(std::forward<Args>(args)...); })
        return t.gridDiscretization(std::forward<Args>(args)...);
    else
        return t.gridGeometry(std::forward<Args>(args)...);
}
 
} // end namespace Dumux
 
#endif