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            (Deprecated: Use non-error_code overload.) Run the io_context
            object's event processing loop to execute at most one handler.
          
count_type run_one(
    boost::system::error_code & ec);
            The run_one() function blocks until one handler has been
            dispatched, or until the io_context
            has been stopped.
          
            The number of handlers that were executed. A zero return value implies
            that the io_context
            object is stopped (the stopped() function returns true).
            Subsequent calls to run(), run_one(), poll()
            or poll_one() will return immediately unless there is a
            prior call to restart().
          
The number of handlers that were executed.
            Calling the run_one() function from a thread that is currently
            calling one of run(), run_one(), run_for(),
            run_until(), poll() or poll_one()
            on the same io_context
            object may introduce the potential for deadlock. It is the caller's reponsibility
            to avoid this.