Re: Proposal: Add the unordered-containers package and the hashable package to the Haskell Platform

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 wrote:

On 21 March 2013 06:54, wren ng thornton 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

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