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This parameter is a 'user_data', for callbacks; many bindings can pass NULL here.
This parameter is a 'destroy_data', for callbacks.
Generics and defining elements of containers and arrays.
Parameter for input. Default is transfer none.
Parameter for input and for returning results. Default is transfer full.
Parameter for returning results. Default is transfer full.
The callback is valid until first called.
The callback is valid only during the call to the method.
Free data after the code is done.
Don't free data after the code is done.