author | haftmann |
Tue, 07 Sep 2010 16:58:01 +0200 | |
changeset 39210 | 985b13c5a61d |
parent 30226 | 2f4684e2ea95 |
permissions | -rw-r--r-- |
structure Nat = struct datatype nat = Suc of nat | Zero_nat; val one_nat : nat = Suc Zero_nat; fun plus_nat (Suc m) n = plus_nat m (Suc n) | plus_nat Zero_nat n = n; fun times_nat (Suc m) n = plus_nat n (times_nat m n) | times_nat Zero_nat n = Zero_nat; end; (*struct Nat*) structure Codegen = struct fun fac (Nat.Suc n) = Nat.times_nat (Nat.Suc n) (fac n) | fac Nat.Zero_nat = Nat.one_nat; end; (*struct Codegen*)