identity.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2019 Tobias Hienzsch
 
#ifndef TETL_FUNCTIONAL_IDENTITY_HPP
#define TETL_FUNCTIONAL_IDENTITY_HPP
 
#include <etl/_utility/forward.hpp>
 
namespace etl {
 
/// \brief etl::identity is a function object type whose operator() returns its
/// argument unchanged.
struct identity {
    using is_transparent = void;
 
    template <typename T>
    [[nodiscard]] constexpr auto operator()(T&& t) const noexcept -> T&&
    {
        return etl::forward<T>(t);
    }
};
 
} // namespace etl
 
#endif // TETL_FUNCTIONAL_IDENTITY_HPP