Type Alias CFUserNotificationCallBack 

pub type CFUserNotificationCallBack = Option<unsafe extern "C-unwind" fn(*mut CFUserNotification, CFOptionFlags)>;

Available on crate feature CFUserNotification only.

Apple’s documentation

Aliased Type

pub enum CFUserNotificationCallBack {
    None,
    Some(unsafe extern "C-unwind" fn(*mut CFUserNotification, usize)),
}

Variants

None

No value.

Some(unsafe extern "C-unwind" fn(*mut CFUserNotification, usize))

Some value of type T.