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A
NULL is OK, both for passing and for returning.
C
This parameter is a 'user_data', for callbacks; many bindings can pass NULL here.
E
Generics and defining elements of containers and arrays.
N
NULL may be passed as the value in, out, in-out; or as a return value.
O
Parameter for returning results. Default is transfer full.
R
Rename the original symbol's name to SYMBOL.
S
The callback is valid only during the call to the method.
The callback is valid until the GDestroyNotify argument is called.
Exposed in C code, not necessarily available in other languages.
T
Free data after the code is done.