unwrap_reference.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2021 Tobias Hienzsch
 
#ifndef TETL_TYPE_TRAITS_UNWRAP_REFERENCE_HPP
#define TETL_TYPE_TRAITS_UNWRAP_REFERENCE_HPP
 
#include <etl/_type_traits/conditional.hpp>
#include <etl/_type_traits/decay.hpp>
#include <etl/_type_traits/is_same.hpp>
 
namespace etl {
 
template <typename T>
struct reference_wrapper;
 
template <typename T>
struct unwrap_reference;
 
template <typename T>
struct unwrap_reference<reference_wrapper<T>> {
    using type = T&;
};
 
template <typename T>
using unwrap_reference_t = typename unwrap_reference<T>::type;
 
template <typename T>
struct unwrap_ref_decay : conditional_t<not is_same_v<decay_t<T>, T>, unwrap_reference<decay_t<T>>, decay<T>> { };
 
template <typename T>
using unwrap_ref_decay_t = typename unwrap_ref_decay<T>::type;
 
} // namespace etl
 
#endif // TETL_TYPE_TRAITS_UNWRAP_REFERENCE_HPP