pub type LPALCGETINTEGERV = Option<unsafe extern "C" fn(_: *mut ALCdevice, _: i32, _: i32, _: *mut i32)>;
enum LPALCGETINTEGERV { None, Some(unsafe extern "C" fn(_: *mut ALCdevice, _: i32, _: i32, _: *mut i32)), }
No value.
Some value of type T.
T