[Haskell-cafe] sizeOf on a type

[Henning Thielemann]

On Fri, 25 Dec 2009, Lennart Augustsson wrote:

> sizeOfPtr :: Ptr a -> Int
> sizeOfPtr = sizeOf . (undefined :: Ptr a -> a)
>
> No need for scoped type variables.  But it does assume sizeOf does not
> use its argument.

That's even better. I'll add that to the Wiki.

   http://www.haskell.org/haskellwiki/Scoped_type_variables#Avoiding_Scoped_Type_Variables