On Tue, Dec 25, 2012 at 11:46 PM, Nathan Hüsken <nathan.huesken@posteo.de> wrote:
The reason is, that I am trying to write FFI for a OOP library.

You might find this useful then:

http://stackoverflow.com/questions/4029455/is-there-a-haskell-equivalent-of-oops-abstract-classes-using-algebraic-data-ty

-- Kim-Ee