Oops, I was hiding the Prelude's pi. My apologies. -----Original Message----- From: Deniz Dogan [mailto:deniz.a.m.dogan@gmail.com] Sent: Fri 5/29/2009 5:01 PM To: Paul Keir Cc: haskell-cafe@haskell.org Subject: Re: [Haskell-cafe] Floating instance and pi[MESSAGE NOT SCANNED] 2009/5/29 Paul Keir :

Hi,

I'd like to make my ADT an instance of the Floating class, but I'm not sure what to put for pi, and GHC gives a warning without it:

Warning: No explicit method nor default method for `GHC.Float.pi'

I tried setting it to undefined, but that gives an error:

`pi' is not a (visible) method of class `Floating'

Any idea?

Paul

Are you sure that your ADT fits into the Floating class in the first place? I reckon if it did, defining "pi" for it wouldn't be a problem. Could you show us the code you have? -- Deniz Dogan