pub type PROPENUMPROCA = Option<unsafe extern "C" fn(arg1: HWND, arg2: LPCSTR, arg3: HANDLE) -> WINBOOL>;
pub enum PROPENUMPROCA { None, Some(unsafe extern "C" fn(*mut HWND__, *const i8, *mut c_void) -> i32), }
No value.
Some value of type T.
T