OGDF-1.0.0.0: src/OGDF/OptimalHierarchyLayout/Cast.hs

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

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

instance () =>
         Castable (OptimalHierarchyLayout) (Ptr RawOptimalHierarchyLayout)
         where
        cast x f = f (castPtr (get_fptr x))
        uncast x f = f (cast_fptr_to_obj (castPtr x))