partial.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_COMMON_PARTIAL_HH
#define DUMUX_COMMON_PARTIAL_HH
 
#include <tuple>
#include <type_traits>
 
#include <dune/istl/multitypeblockvector.hh>
 
namespace Dumux {
 
template<class ...Args, std::size_t ...i>
auto partial(Dune::MultiTypeBlockVector<Args...>& v, Dune::index_constant<i>... indices)
{
    return Dune::MultiTypeBlockVector<std::add_lvalue_reference_t<std::decay_t<std::tuple_element_t<indices, std::tuple<Args...>>>>...>(v[indices]...);
}
 
template<class ...Args, std::size_t ...i>
auto partial(const Dune::MultiTypeBlockVector<Args...>& v, Dune::index_constant<i>... indices)
{
    return Dune::MultiTypeBlockVector<std::add_lvalue_reference_t<const std::decay_t<std::tuple_element_t<indices, std::tuple<Args...>>>>...>(v[indices]...);
}
 
template<class ...Args, std::size_t ...i>
auto partial(std::tuple<Args...>& v, Dune::index_constant<i>... indices)
{
    return std::tuple<std::add_lvalue_reference_t<std::decay_t<std::tuple_element_t<indices, std::tuple<Args...>>>>...>(std::get<indices>(v)...);
}
 
template<class ...Args, std::size_t ...i>
auto partial(const std::tuple<Args...>& v, Dune::index_constant<i>... indices)
{
    return std::tuple<std::add_lvalue_reference_t<const std::decay_t<std::tuple_element_t<indices, std::tuple<Args...>>>>...>(std::get<indices>(v)...);
}
 
template<class T, std::size_t ...i>
auto partial(T& t, std::tuple<Dune::index_constant<i>...> indices)
{
    return partial(t, Dune::index_constant<i>{}...);
}
 
} // end namespace Dumux
 
#endif