[ CCode ( instance_pos = 1.9 ) ]
[ Version ( since = "3.26" ) ]
public delegate void BookBackendCustomOpFunc (BookBackend book_backend, Cancellable? cancellable = null) throws Error
A callback prototype being called in a dedicated thread, scheduled by schedule_custom_operation.
| book_backend |
an BookBackend |
| cancellable |
an optional Cancellable, as provided to schedule_custom_operation |
| user_data |
a function user data, as provided to schedule_custom_operation |