[Haskell-cafe] Floating instance and pi

[Deniz Dogan]

2009/5/29 Paul Keir <pkeir at dcs.gla.ac.uk>:
> 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