Add a full_adder version with stateful interface.

The state itself is still empty, this uses the (yank-pasted) stateless
function from Sim.hs to reuse the existing full_adder.

diff --git a/Adders.hs b/Adders.hs
index f32f5d4f9fd89acaa71d4535c072dafeb5f78361..b09b98fdc4b43823fc13325f9887a7ea7f6cf260 100644 (file)
--- a/Adders.hs
+++ b/Adders.hs
@@ -5,6 +5,10 @@ import Language.Haskell.Syntax
 
 mainIO f = Sim.simulateIO (Sim.stateless f) ()
 
+-- This function is from Sim.hs, but we redefine it here so it can get inlined
+-- by default.
+stateless f = \i s -> (s, f i)
+
 show_add f = do print ("Sum:   " ++ (displaysigs s)); print ("Carry: " ++ (displaysig c))
   where
     a = [High, High, High, High]
@@ -47,6 +51,8 @@ full_adder (a, b, cin) = (s, c)
     (s, c2)  = half_adder(s1, cin)
     c        = c1 `hwor` c2
 
+sfull_adder = stateless full_adder
+
 -- Four bit adder
 -- Explicit version
 -- [a] -> [b] -> ([s], cout)