[ Version ( since = "0.11.6" ) ]
public void set_handler_request_notification ()
Indicate that this is a Handler willing to be notified about requests for channels that it is likely to be asked to handle.
This means that the request_added and request_removed signals will be fired and get_pending_requests will return the list of pending requests.
This method may only be called before register is called, and may only be called on objects whose class implements handle_channels.
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