[Haskell-cafe] ANN: convertible (first release)

[Daniel Schüssler]

Hi,

On Wednesday 28 January 2009 04:30:07 John Goerzen wrote:
> On Tue, Jan 27, 2009 at 09:41:30PM -0500, wren ng thornton wrote:

> > I once again point out that realToFrac is *wrong* for converting from
> > Float or Double.
> >
> >     > realToFrac (1/0::Float) ::Double
> >
> >     3.402823669209385e38
>
> Yes, I understand what you are saying and agree with you.  But there
> is nothing better in the standard library

don't know whether you consider GHC as standard library, but if you do...:

import GHC.Types
import GHC.Prim

-- | Double to Float
d2f  (D# d) = F# (double2Float# d)

-- | Float to Double
f2d  (F# f) = D# (float2Double# f)


ghci> f2d (1/0)
Infinity
it :: Double

:)

--
Daniel