# Annotation Glossary

### A

allow-none

  NULL is OK, both for passing and for returning.

### C

closure

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

### S

scope notified

  The callback is valid until the GDestroyNotify argument is called.

### T

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.