Parameter points to an array of items.

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

Generics and defining elements of containers and arrays.

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

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

Parameter for returning results. Default is transfer full.

The callback is valid until first called.

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

The callback is valid until the GDestroyNotify argument is called.

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

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

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

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

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