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