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NULL is ok, both for passing and for returning.
Override the parsed C type with given type.
Free data after the code is done.
Out parameter, where caller must allocate storage.
Don't free data after the code is done.
Parameter for returning results. Default is transfer full.
Generics and defining elements of containers and arrays.
Free data container after the code is done.
Parameter points to an array of items.
The callback is valid only during the call to the method.
This parameter is a 'user_data', for callbacks; many bindings can pass NULL here.