Type Alias message_handler_func_t 

pub type message_handler_func_t = Option<unsafe extern "C" fn(message: c_int, arg: *mut c_void)>;

Aliased Type

pub enum message_handler_func_t {
    None,
    Some(unsafe extern "C" fn(i32, *mut c_void)),
}

Variants

None

No value.

Some(unsafe extern "C" fn(i32, *mut c_void))

Some value of type T.