GtkClipboard callbacks

[murrayc t-online de (Murray Cumming)]

These GtkClipboard functions take callbacks:
gtk_clipboard_set_with_data()
gtk_clipboard_request_contents()
gtk_clipboard_request_text()

Am I correct in thinking that those callbacks will be called _only_
once? It's relevant to bindings, as there's no associated destroy
notifier callback.

-- 
Murray Cumming
murrayc usa net
www.murrayc.com