One annoying with an MPTC approach is that suddenly defaulting stops working.
This can result in a requiring of a lot more signatures from users or little helpers everywhere like the 'sip' below. -Edward On Thu, Mar 21, 2013 at 10:36 AM, Bas van Dijk <v.dijk....@gmail.com> wrote: > On 21 March 2013 06:54, wren ng thornton <w...@freegeek.org> wrote: > > One concern with the above approach: is "siphash" a sufficiently generic > > name, or is it just one hashing method that happens to deflect this DoS > > issue? I haven't read the paper, so... > > One could of course generalize the above method using something like: > > -- A type hashed as h > newtype Hashed h a = Hashed a > > instance (HashableAs h a) => Hashable (Hashed h a) where > hashWithSalt = hashWithSaltAs > > class HashableAs h a where > hashWithSaltAs :: Int -> Hashed h a -> Int > > data Sip > > sip :: a -> Hashed Sip a > sip = Hashed > > instance HashableAs Sip Text where > hashWithSaltAs salt (Hashed x) = sipHashWithSalt salt x > > instance HashableAs Sip ByteString where > ... > > Regards, > > Bas > > _______________________________________________ > Libraries mailing list > librar...@haskell.org > http://www.haskell.org/mailman/listinfo/libraries >
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