# Annotation Glossary

### S

scope async

  The callback is valid until first called.

### O

out caller-allocates

  Out parameter, where caller must allocate storage.

### 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.

### E

element-type

  Generics and defining elements of containers and arrays.

### O

out

  Parameter for returning results. Default is transfer full.

### I

in

  Parameter for input. Default is transfer none.

### T

transfer none

  Don't free data after the code is done.

transfer full

  Free data after the code is done.

transfer container

  Free data container after the code is done.

type

  Override the parsed C type with given type.

### A

array

  Parameter points to an array of items.

### D

default

  Default parameter value (for in case the shadows-to function has less parameters).

### C

closure

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