tuple_element.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2021 Tobias Hienzsch
 
#ifndef TETL_TUPLE_TUPLE_ELEMENT_HPP
#define TETL_TUPLE_TUPLE_ELEMENT_HPP
 
#include <etl/_cstddef/size_t.hpp>
#include <etl/_type_traits/add_const.hpp>
#include <etl/_type_traits/add_cv.hpp>
#include <etl/_type_traits/add_volatile.hpp>
 
namespace etl {
 
template <typename... Ts>
struct tuple;
 
template <size_t I, typename T>
struct tuple_element;
 
template <size_t I, typename T>
using tuple_element_t = typename tuple_element<I, T>::type;
 
template <size_t I, typename T>
struct tuple_element<I, T const> {
    using type = add_const_t<typename tuple_element<I, T>::type>;
};
 
template <size_t I, typename T>
struct tuple_element<I, T volatile> {
    using type = add_volatile_t<typename tuple_element<I, T>::type>;
};
 
template <size_t I, typename T>
struct tuple_element<I, T const volatile> {
    using type = add_cv_t<typename tuple_element<I, T>::type>;
};
 
} // namespace etl
 
#endif // TETL_TUPLE_TUPLE_ELEMENT_HPP