pub type FT_Outline_MoveToFunc = Option<unsafe extern "C" fn(to: *const FT_Vector, user: *mut c_void) -> c_int>;
enum FT_Outline_MoveToFunc { None, Some(unsafe extern "C" fn(_: *const FT_Vector_, _: *mut c_void) -> i32), }
No value.
Some value of type T.
T