[Haskell-cafe] Trying to write 'safeFromInteger'
Bulat Ziganshin
bulat.ziganshin at gmail.com
Wed Apr 8 05:39:16 EDT 2009
Hello Henning,
Wednesday, April 8, 2009, 1:43:31 AM, you wrote:
> i is Integer, so asTypeOf is not so easy to apply. I propose to write
safeFromInteger i =
let mb = maxBound in
if i > (toInteger mb)
then Nothing
else Just (fromInteger i `asTypeOf` mb)
or you can do it opposite way:
safeFromInteger i =
let res = fromInteger i in
if i > (toInteger (maxBound `asTypeOf` res))
then Nothing
else Just res
--
Best regards,
Bulat mailto:Bulat.Ziganshin at gmail.com
More information about the Haskell-Cafe
mailing list