You can make numeric class instances from arbitrary Applicatives [1].  I imagine a lot of them (e.g. Stream) would want at least some non-strictness.  We might provide strict alternatives for sum and product.  I wonder what else.<br>

<br>[1] <a href="http://hackage.haskell.org/cgi-bin/hackage-scripts/package/applicative-numbers">http://hackage.haskell.org/cgi-bin/hackage-scripts/package/applicative-numbers</a><br><br>- Conal<br><br><div class="gmail_quote">

On Sat, Jun 13, 2009 at 7:03 AM, Keith Sheppard <span dir="ltr">&lt;<a href="mailto:keithshep@gmail.com">keithshep@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">

Is there any reason that sum isn&#39;t strict? I can&#39;t think of any case<br>
where that is a good thing.<br>
<br>
Prelude&gt; sum [0 .. 1000000]<br>
*** Exception: stack overflow<br>
<br>
-Keith<br>
<font color="#888888">--<br>
<a href="http://keithsheppard.name" target="_blank">keithsheppard.name</a><br>
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