1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
// Build don't link: // Special g++ Options: -Wall enum tristate { no = -1, maybe, yes }; tristate tristate_satisfies (register tristate const t1, register tristate const t2) { switch (t1) { case no: return (tristate) -t2; case maybe: return yes; case yes: return t2; } return maybe; }