pub type LPALSOURCEPLAYATTIMEVSOFT = Option<unsafe extern "C" fn(n: ALsizei, sources: *const ALuint, start_time: ALint64SOFT)>;
enum LPALSOURCEPLAYATTIMEVSOFT { None, Some(unsafe extern "C" fn(_: i32, _: *const u32, _: i64)), }
No value.
Some value of type T.
T