at.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2024 Tobias Hienzsch
 
#ifndef TETL_MPL_AT_HPP
#define TETL_MPL_AT_HPP
 
#include <etl/_cstddef/size_t.hpp>
#include <etl/_mpl/list.hpp>
 
namespace etl::mpl {
 
/// \ingroup mpl
/// @{
 
template <etl::size_t I, typename List>
struct at;
 
template <typename Head, typename... Tail>
struct at<0, list<Head, Tail...>> {
    using type = Head;
};
 
template <etl::size_t I, typename Head, typename... Tail>
struct at<I, list<Head, Tail...>> {
    using type = typename at<I - 1, list<Tail...>>::type;
};
 
template <etl::size_t I, typename List>
using at_t = typename at<I, List>::type;
 
/// @}
 
} // namespace etl::mpl
 
#endif // TETL_MPL_AT_HPP