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#[repr(C, u8)] pub enum TT { AA(u64, u64), BB, } #[repr(C,u8)] pub enum T { A(u64), B, } extern "C" { pub fn t_add(a: T, b: T) -> u64; pub fn tt_add(a: TT, b: TT) -> u64; } fn main() { assert_eq!(33, unsafe { tt_add(TT::AA(1,2), TT::AA(10,20)) }); assert_eq!(11, unsafe { t_add(T::A(1), T::A(10)) }); }