If intToNat is a blunt instrument, then fromIntegral is the rapier :-) Remember Word is GHC-specific; the FFI doesn't define it.
Simon > -----Original Message----- > From: Julian Seward (Intl Vendor) [mailto:[EMAIL PROTECTED]] > Sent: 25 February 2002 16:57 > To: [EMAIL PROTECTED]; [EMAIL PROTECTED] > Subject: RE: Straightforward conversion from Int <-> Word > > > > I've found this annoying in the past, and have resorted to hitting > it on the head (GHC-specifically) with a blunt instrument: > > intToNat :: Int -> Word > intToNat (I# i#) = W# (unsafeCast# i#) > > This probably defeats the good intentions of the FFI designers, > but it kinda seems like it'll work on all reasonable architectures. > > J > > | -----Original Message----- > | From: Jan-Willem Maessen [mailto:[EMAIL PROTECTED]] > | Sent: Monday, February 25, 2002 4:46 PM > | To: [EMAIL PROTECTED] > | Subject: Straightforward conversion from Int <-> Word > | > | > | I've cast about a bit and haven't been able to find the appropriate > | functionality, so I'm asking here. > | > | I'd like to convert Int32 to and from Word32 in the good > old-fashioned > | bitwise fashion (perserving modular arithmetic). I have > the following > | code to show what I mean: > | > | intToNat i > | | i >= 0 = fromIntegral i > | | otherwise = fromIntegral (i - minBound) + negBound > | where negBound = fromInteger . negate . toInteger $ > | (minBound :: Int) > | > | One might think that "intToWord32" and "word32ToInt" in lang/Word > | would do what I want---but no! These are depracated, and I must use > | fromIntegral, which will only perform the conversion > correctly for the > | portions of the numeric range which overlap. > | > | How do I do the straightforward conversion module 2^32? > I'm sure it's > | buried in there somewhere... I can't even turn up an > appropriate type > | signature, though. > | > | -Jan-Willem Maessen > | > | _______________________________________________ > | Glasgow-haskell-users mailing list > | [EMAIL PROTECTED] > | http://www.haskell.org/mailman/listinfo/glasgow-haskell-users > | > _______________________________________________ > Glasgow-haskell-users mailing list > [EMAIL PROTECTED] > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users > _______________________________________________ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
