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NULL is OK, both for passing and for returning.
Parameter points to an array of items.
This parameter is a 'user_data', for callbacks; many bindings can pass NULL here.
Generics and defining elements of containers and arrays.
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.
Exposed in C code, not necessarily available in other languages.
Free data container after the code is done.
Alias for transfer none, used for objects with floating refs.
Free data after the code is done.
Don't free data after the code is done.