The one in the numbers package is not quite as clever as John's; it's the naïve version of lazy naturals.
On 10/17/07, Stuart Cook < [EMAIL PROTECTED]> wrote: > > On 10/17/07, John Meacham < [EMAIL PROTECTED]> wrote: > > if anyone is interested, Although I bet this has been implemented a > > hundred times over, I have attached my lazy naturals module below just > > for larks. It is quite efficient as such things go and very lazy. for > > instance (genericLength xs > 5) will only evaluate up to the 5th element > > of the list before returning a result. and ((1 `div` 0) > 17) is true, > > not bottom. > > > If anyone wants me to clean this up and package it as a real module, I > > would be happy to do so. > > It looks like there's already a lazy-natural type in the "numbers" > package on Hackage, but not having used it I have no idea what it's > like. > > > http://hackage.haskell.org/cgi-bin/hackage-scripts/package/numbers-2007.9.25 > http://tinyurl.com/2pmthz > > > Stuart > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe >
_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
