Re: [Haskell-cafe] curious about sum

Jochem Berndsen wrote:

Keith Sheppard wrote:

...

Is there any reason that sum isn't strict? I can't think of any case where that is a good thing.

Prelude> sum [0 .. 1000000] *** Exception: stack overflow

It is useful if the (+) is nonstrict; although I cannot think of any useful mathematical structure where (+) would be nonstrict.

What about some numeric representations? type MyNum = [()] instance Num MyNum where (+) = (++) Regards, Stephan -- Früher hieß es ja: Ich denke, also bin ich. Heute weiß man: Es geht auch so. - Dieter Nuhr