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<TITLE>RE: [Haskell-cafe] Floating instance and pi</TITLE>
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<P><FONT SIZE=2>Oops, I was hiding the Prelude's pi. My apologies.<BR>
<BR>
-----Original Message-----<BR>
From: Deniz Dogan [<A HREF="mailto:deniz.a.m.dogan@gmail.com">mailto:deniz.a.m.dogan@gmail.com</A>]<BR>
Sent: Fri 5/29/2009 5:01 PM<BR>
To: Paul Keir<BR>
Cc: haskell-cafe@haskell.org<BR>
Subject: Re: [Haskell-cafe] Floating instance and pi[MESSAGE NOT SCANNED]<BR>
<BR>
2009/5/29 Paul Keir <pkeir@dcs.gla.ac.uk>:<BR>
> Hi,<BR>
><BR>
> I'd like to make my ADT an instance of the Floating class,<BR>
> but I'm not sure what to put for pi, and GHC gives a warning<BR>
> without it:<BR>
><BR>
> Warning: No explicit method nor default method for `GHC.Float.pi'<BR>
><BR>
> I tried setting it to undefined, but that gives an error:<BR>
><BR>
> `pi' is not a (visible) method of class `Floating'<BR>
><BR>
> Any idea?<BR>
><BR>
> Paul<BR>
<BR>
Are you sure that your ADT fits into the Floating class in the first<BR>
place? I reckon if it did, defining "pi" for it wouldn't be a<BR>
problem. Could you show us the code you have?<BR>
<BR>
--<BR>
Deniz Dogan<BR>
<BR>
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