On 2008-03-17, John Meacham
On Mon, Mar 17, 2008 at 12:59:09PM -0400, David Roundy wrote:
foreign import ccall unsafe "math.h log10" log10 :: Double -> Double
since in ghc CDouble and Double are identical.
It's a bit sloppier, but shouldn't cause any trouble. And I've no idea how realToFrac is implemented, but would worry about it behaving oddly... for instance when given NaNs.
Yes. 'realToFrac' is inherently pretty broken and should be avoided whenever possible. It is not all all obvious to me what the correct primitive should be.. but we really should do something better for haskell'. relying on RULES firing as ghc currently does doesn't seem ideal..
hmm.. maybe a 'FloatMax' type and have 'fromFloatMax' and 'toFloatMax' in 'Fractional' and 'Real' respectively? hmm.. hc has 'fromDouble' and 'toDouble' there, but jhc also supports a 'Float128' type (when the underlying hardware does). so this still isn't quite right.
Well, the whole numeric hierarchy needs to be redone to support proper mathematical structures like groups, rings, and fields. Once that's done, this might end up being clarified a bit. -- Aaron Denney -><-