feat update

}

}// namespace internal

template<typename Arg = internal::Tag,

         typename Callback = std::function<void()>>

template<typename Arg = internal::Tag, typename Callback = std::function<void()>>

class Cleanup final {

public:

    static_assert(internal::WasDeduced<Arg>(),

                  "Do not specify the first template argument");

    static_assert(internal::WasDeduced<Arg>(), "Do not specify the first template argument");

    Cleanup(Callback callback) : callback_(std::move(callback)) {}

    Cleanup(Cleanup &&other) = default;

    void Cancel() && { callback_.reset(); }

    void Cancel() { callback_.reset(); }

    void Invoke() &&

    void Invoke()

    {

        assert(callback_);

        (*callback_)();