| T | C | O | S | A | S | E |  |
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T
Free data after the code is done.
C
This parameter is a 'user_data', for callbacks; many bindings can pass NULL here.
O
Parameter for returning results. Default is transfer full.
S
The callback is valid until the GDestroyNotify argument is called.
A
NULL is ok, both for passing and for returning.
S
The callback is valid only during the call to the method.
E
Generics and defining elements of containers and arrays.