Proposed change to ForeignPtr

[Simon Marlow]

> 1) Add these functions:
> 
>      makeForeignPtr            
>        :: Ptr a -> FunPtr (Ptr a -> IO ()) -> IO (ForeignPtr a)
>      attachForeignPtrFinalizer 
>        :: ForeignPtr a -> FunPtr (Ptr a -> IO ()) -> IO ()
> 
>    It is implementation defined whether the free functions are allowed
>    to call Haskell functions.
> 
> 2) Remove newForeignPtr and addForeignPtrFinalizer
>    [GHC can go ahead and list them as non-standard extensions]
> 
> 
> There's a minor issue about whether the old function names should be
> reused (leaving GHC to come up with its own names) or not.  I have
> ceased to care either way.

I have a slight preference for re-using the old names, at least for
newForeignPtr.  The reason is that it follows the naming conventions in 

http://www.haskell.org/~simonmar/libraries/conventions.html

Cheers,
	Simon