Re: Proposal: Remove Num superclass of Bits

On Sat, Oct 15, 2011 at 12:11 PM, Ian Lynagh wrote:

On Sat, Oct 15, 2011 at 11:56:27AM +0200, Bas van Dijk wrote:

...

On 15 October 2011 00:01, Ian Lynagh wrote:

...

Removing the Num superclass of Bits was also mentioned, but that would need its own proposal.

Ok, I would like to propose removing the Num superclass of Bits.

Would we just remove default methods like    bit i = 1 `shiftL` i    x `testBit` i = (x .&. bit i) /= 0 ?

You could use DefaultSignatures[1]: class Bits a where default bit :: Num a => Int -> a bit i = 1 `shiftL` i ... Does it have to be/stay portable to non-GHC (or older GHC) compilers? [1] http://www.haskell.org/ghc/docs/7.2.1/html/users_guide/type-class-extensions...

Thanks Ian

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