{-# LANGUAGE FlexibleInstances, FlexibleContexts, TypeFamilies,
  MultiParamTypeClasses, OverlappingInstances, IncoherentInstances
  #-}
module OGDF.EdgeElement.Cast where
import Foreign.Ptr
import FFICXX.Runtime.Cast
import System.IO.Unsafe
import OGDF.EdgeElement.RawType
import OGDF.EdgeElement.Interface

instance (IEdgeElement a, FPtr a) =>
         Castable (a) (Ptr RawEdgeElement)
         where
        cast x f = f (castPtr (get_fptr x))
        uncast x f = f (cast_fptr_to_obj (castPtr x))

instance () => Castable (EdgeElement) (Ptr RawEdgeElement) where
        cast x f = f (castPtr (get_fptr x))
        uncast x f = f (cast_fptr_to_obj (castPtr x))