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NULL is OK, both for passing and for returning.
Parameter points to an array of items.
Generics and defining elements of containers and arrays.
Parameter for returning results. Default is transfer full.
The callback is valid until the GDestroyNotify argument is called.
Exposed in C code, not necessarily available in other languages.
Free data container after the code is done.
Free data after the code is done.
Don't free data after the code is done.