Type Alias CFMachPortInvalidationCallBack 

pub type CFMachPortInvalidationCallBack = Option<unsafe extern "C-unwind" fn(*mut CFMachPort, *mut c_void)>;

Available on crate feature CFMachPort only.

Apple’s documentation

Aliased Type

pub enum CFMachPortInvalidationCallBack {
    None,
    Some(unsafe extern "C-unwind" fn(*mut CFMachPort, *mut c_void)),
}

Variants

None

No value.

Some(unsafe extern "C-unwind" fn(*mut CFMachPort, *mut c_void))

Some value of type T.