Re: [Haskell-cafe] getPtrSize works, but is annoying

On Fri, Dec 18, 2009 at 12:20 PM, Gregory Crosswhite wrote:

Ugh, I figured out how to write code to do what I wanted, but it seems like an ugly solution:

       getPtrSize :: Ptr a -> Int        getPtrSize = getFrom dummy          where                getFrom :: a -> Ptr a -> Int                getFrom dummy _ = sizeOf dummy

With -XScopedTypeVariables: getPtrSize :: forall a. Ptr a -> Int getPtrSize p = sizeOf (undefined :: a)