On 5/27/07, Stefan O'Rear <[EMAIL PROTECTED]> wrote:
memofix :: ((a -> b) -> (a -> b)) -> a -> b
memofix ff = let g = memoize (ff g) in g
fib = memofix $ \fib k -> case k of
0 -> 0
1 -> 1
n -> fib (n-1) + fib (n-2)
But this way you miss pattern matching and guards? How would you write
something like:
ack = curry (memoize a) where
a (0,n) = n + 1
a (m,0) = ack (m-1) 1
a (m,n) | m < 0 || n < 0 = error "ack of negative integer"
| otherwise = let inner = ack m (n-1)
in ack (m-1) inner
--
Felipe.
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