[Haskell-cafe] Re: (flawed?) benchmark : sort
Brandon S. Allbery KF8NH
allbery at ece.cmu.edu
Tue Mar 11 01:43:36 EDT 2008
On Mar 11, 2008, at 0:20 , Chaddaï Fouché wrote:
> 2008/3/11, David Menendez <dave at zednenem.com>:
>> I think Adrian is just arguing that a == b should imply f a == f b,
>> for all definable f, in which case it doesn't *matter* which of two
>> equal elements you choose, because there's no semantic difference.
> I completely agree that this propriety should be true for all Eq
> instance exported by a public module. I don't care if it is not the
> case in a isolated code, but libraries shouldn't break expected
> invariant (or at least be very cautious and warn the user). Even Eq
> Double respects this propriety as far as I know.
I wouldn't want to bet on that (Eq Double, that is). Floating
point's just *evil*.
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university KF8NH
More information about the Haskell-Cafe