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