Finalizers and FFI

[Alastair Reid]

> > import Foreign.ForeignPtr
>
> I couldn't get finalisers to work either with the newForeignPtr from
> this module. I didn't know how to create a proper FunPtr.

You create a FunPtr using foreign import:

  foreign import ccall "malloc.h &free" free_ptr :: FunPtr (Ptr a -> IO ())

> In Foreign.Concurrent there is a newForeignPtr that is easier to use:

But, sadly, not portable.

--
Alastair Reid