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.
NULL may be passed as the value in, out, in-out; or as a return value.
NULL may be passed instead of a pointer to a location.
Parameter for returning results. Default is transfer full.
Rename the original symbol's name to SYMBOL.
The callback is valid until first called.
Exposed in C code, not necessarily available in other languages.
Free data after the code is done.
Don't free data after the code is done.