Type Alias CFTreeRetainCallBack 

pub type CFTreeRetainCallBack = Option<unsafe extern "C" fn(info: *const c_void) -> *const c_void>;

Apple SDK type alias CFTreeRetainCallBack.

Aliased Type

pub enum CFTreeRetainCallBack {
    None,
    Some(unsafe extern "C" fn(*const c_void) -> *const c_void),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*const c_void) -> *const c_void)

Some value of type T.