Annotation Glossary: libblockdev Reference Manual for libblockdev 3.1.1.

# Annotation Glossary

### A

allow-none

  NULL is OK, both for passing and for returning.

array

  Parameter points to an array of items.

### C

constructor

  This symbol is a constructor, not a static method.

### 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.

### S

scope notified

  The callback is valid until the GDestroyNotify argument is called.

skip

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

### T

transfer container

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

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.