Annotation Glossary: WPE WebExtensions and DOM Reference Manual

# Annotation Glossary

### C

closure

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

### E

element-type

  Generics and defining elements of containers and arrays.

### N

nullable

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

### S

scope async

  The callback is valid until first called.

### T

transfer full

  Free data after the code is done.

transfer none

  Don't free data after the code is done.