Hello, it is a real code snippet, but I failed to include the necessary pragma (which is: {-# OPTIONS_GHC -fglasgow-exts #-} or {-# OPTIONS_GHC -XMagicHash #-} at the beginning of the file). the "#" suffix is for unboxed types: http://www.haskell.org/ghc/docs/latest/html/users_guide/primitives.html http://www.haskell.org/ghc/docs/latest/html/users_guide/syntax-extns.html#ma... Greetings, Daniel On Wednesday 11 February 2009 00:19:56 Dylan Tisdall wrote:

Maybe I'm just a noob falling for someone's joke here, but I can't make that sample, or anything else I tried with "#" on the end of names, to compile with ghci. In the example below, I get a parse error at the line defining d2f. Is this a real code snippet?

Cheers, Dylan

On Feb 10, 2009, at 2:46 AM, Daniel Schüssler wrote:

...

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 _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe