Re: [Haskell-beginners] maximum: stack overflow?

Hi Alex, On Fri, Mar 13, 2009 at 12:43 AM, Alexander Dunlap wrote:

Isn't maximum always (semantically) strict anyway? I.e.

maximum [1,2,undefined] = undefined

If max is (semantically) strict, then so is maximum. On the other hand, both may be non-strict:

data Switch = Off | On deriving (Eq, Show)

instance Ord Switch where On <= Off = False _ <= _ = True max _ On = On max a Off = a

*Main> maximum [undefined,Off,On] On *Main> foldl1' max [undefined,Off,On] *** Exception: Prelude.undefined Best, Roland -- http://roland.zumkeller.googlepages.com/