# Annotation Glossary

O

out

  Parameter for returning results. Default is transfer full.

S

scope async

  The callback is valid until first called.

A

allow-none

  NULL is ok, both for passing and for returning.

I

inout

  Parameter for input and for returning results. Default is transfer full.

C

closure

  This parameter is a 'user_data', for callbacks; many bindings can pass NULL here.

T

transfer none

  Don't free data after the code is done.

A

array

  Parameter points to an array of items.

I

in

  Parameter for input. Default is transfer none.

T

transfer full

  Free data after the code is done.

E

error-domains

  Typed errors. Similar to throws in Java.