dunevectors.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-FileCopyrightInfo: Copyright © DuMux Project contributors, see AUTHORS.md in root folder
// SPDX-License-Identifier: GPL-3.0-or-later
//
#ifndef DUMUX_LINEAR_DUNE_VECTORS_HH
#define DUMUX_LINEAR_DUNE_VECTORS_HH
 
#include <type_traits>
#include <dune/common/typetraits.hh>
#include <dune/common/std/type_traits.hh>
 
#include <dune/common/fvector.hh>
#include <dune/istl/bvector.hh>
#include <dune/istl/multitypeblockvector.hh>
 
// implementation details specific to this header
namespace Dumux::Detail::DuneVectors {
 
template<class T, std::enable_if_t<Dune::IsNumber<std::decay_t<T>>::value, int> = 0>
constexpr std::size_t blockSize() { return 1; }
 
template<class T, std::enable_if_t<!Dune::IsNumber<std::decay_t<T>>::value, int> = 0>
constexpr std::size_t blockSize() { return std::decay_t<T>::size(); }
 
template<class C> using StateDetector = decltype(std::declval<C>()[0].state());
 
} // end namespace Dumux::Detail::DuneVectors
 
// implementation details used elsewhere in Dumux
namespace Dumux::Detail {
 
template<class V, bool hasState>
struct NativeDuneVectorTypeImpl
{ using type = V; };
 
// only support single-nested block vectors for now
template<class V>
struct NativeDuneVectorTypeImpl<V, true>
{
    using Scalar = std::decay_t<decltype(std::declval<V>()[0][0])>;
    static constexpr auto blockSize = Detail::DuneVectors::blockSize<decltype(std::declval<V>()[0])>();
    using BlockType = Dune::FieldVector<Scalar, blockSize>;
    using type = Dune::BlockVector<BlockType>;
};
 
// get native dune type from dumux vector (possibly with state)
template<class V>
struct NativeDuneVectorType
{
    using type = typename NativeDuneVectorTypeImpl<
        V, Dune::Std::is_detected<Detail::DuneVectors::StateDetector, V>{}
    >::type;
};
 
// specialization for multitype vector
template<class... Args>
struct NativeDuneVectorType<Dune::MultiTypeBlockVector<Args...>>
{
    using type = Dune::MultiTypeBlockVector<
        typename NativeDuneVectorType<Args>::type...
    >;
};
 
} // end namespace Dumux::Detail
 
#endif