pub type LPWPUCLOSETHREAD = Option<unsafe extern "system" fn(lpThreadId: LPWSATHREADID, lpErrno: LPINT) -> c_int>;
pub enum LPWPUCLOSETHREAD { None, Some(unsafe extern "system" fn(*mut WSATHREADID, *mut i32) -> i32), }
No value.
Some value of type T.
T