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            (Deprecated: Use non-error_code overload.) Run the io_context
            object's event processing loop to execute one ready handler.
          
count_type poll_one(
    boost::system::error_code & ec);
            The poll_one() function runs at most one handler that is
            ready to run, without blocking.
          
Set to indicate what error occurred, if any.
The number of handlers that were executed.