# Annotation Glossary

### A

allow-none

  NULL is OK, both for passing and for returning.

array

  Parameter points to an array of items.

### E

element-type

  Generics and defining elements of containers and arrays.

### I

in

  Parameter for input. Default is transfer none.

inout

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

### N

nullable

  NULL may be passed as the value in, out, in-out; or as a return value.

### S

scope call

  The callback is valid only during the call to the method.

skip

  Exposed in C code, not necessarily available in other languages.

### T

transfer full

  Free data after the code is done.

transfer none

  Don't free data after the code is done.

type

  Override the parsed C type with given type.

### V

virtual

  This is the invoker for a virtual method.