forward_like.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2024 Tobias Hienzsch
 
#ifndef TETL_UTILITY_FORWARD_LIKE_HPP
#define TETL_UTILITY_FORWARD_LIKE_HPP
 
#include <etl/_type_traits/is_const.hpp>
#include <etl/_type_traits/is_lvalue_reference.hpp>
#include <etl/_type_traits/remove_reference.hpp>
#include <etl/_utility/as_const.hpp>
#include <etl/_utility/move.hpp>
 
namespace etl {
 
template <typename T, typename U>
[[nodiscard]] constexpr auto forward_like(U&& x) noexcept -> auto&&
{
    constexpr auto isAddingConst = etl::is_const_v<etl::remove_reference_t<T>>;
 
    if constexpr (etl::is_lvalue_reference_v<T&&>) {
        if constexpr (isAddingConst) {
            return etl::as_const(x);
        } else {
            return static_cast<U&>(x);
        }
    } else {
        if constexpr (isAddingConst) {
            return etl::move(etl::as_const(x));
        } else {
            return etl::move(x);
        }
    }
}
 
} // namespace etl
 
#endif // TETL_UTILITY_FORWARD_LIKE_HPP