## Annotation Glossary

### A

array

  Parameter points to an array of items.

### 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.

### O

optional

  NULL may be passed instead of a pointer to a location.

out

  Parameter for returning results. Default is transfer full.

out caller-allocates

  Out parameter, where caller must allocate storage.

### S

scope async

  The callback is valid until first called.

scope notified

  The callback is valid until the GDestroyNotify argument is called.

### T

transfer container

  The caller owns the data container, but not the data inside it.

transfer floating

  Alias for transfer none, used for objects with floating refs.

transfer full

  The caller owns the data, and is responsible for free it.

transfer none

  The data is owned by the callee, which is responsible of freeing it.