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This parameter is a 'user_data', for callbacks; many bindings can pass NULL here.
This parameter is a 'destroy_data', for callbacks.
Generics and defining elements of containers and arrays.
Parameter for input. Default is transfer none.
Parameter for input and for returning results. Default is transfer full.
NULL may be passed instead of a pointer to a location.
Parameter for returning results. Default is transfer full.
The callback is valid until first called.
The callback is valid only during the call to the method.
Exposed in C code, not necessarily available in other languages.
The caller owns the data, and is responsible for free it.
The data is owned by the callee, which is responsible of freeing it.