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    std::atomic_ref<T>::is_always_lock_free

    From cppreference.net
     
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    std::atomic_ref
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    static constexpr bool is_always_lock_free = /*implementation-defined*/;
    		(since C++20)

    Equals true if the operations on this atomic_ref type is always lock-free and false if it is never or sometimes lock-free.

    The value of this constant is consistent with the result of member function is_lock_free.

    See also

    		 checks if the atomic_ref object is lock-free
    (public member function)