HROOT-io-0.8: src/HROOT/IO/TDirectoryFile/Cast.hs

{-# LANGUAGE FlexibleInstances, FlexibleContexts, TypeFamilies, 
             MultiParamTypeClasses, OverlappingInstances, IncoherentInstances #-}

module HROOT.IO.TDirectoryFile.Cast where


import Foreign.Ptr
import Foreign.ForeignPtr (castForeignPtr, newForeignPtr_)
import Foreign.ForeignPtr.Unsafe
import FFICXX.Runtime.Cast
import System.IO.Unsafe

import HROOT.IO.TDirectoryFile.RawType
import HROOT.IO.TDirectoryFile.Interface

instance (ITDirectoryFile a, FPtr a) => Castable a (Ptr RawTDirectoryFile) where
  cast = unsafeForeignPtrToPtr . castForeignPtr . get_fptr
  uncast = cast_fptr_to_obj . castForeignPtr . unsafePerformIO . newForeignPtr_ 

instance Castable TDirectoryFile (Ptr RawTDirectoryFile) where
  cast = unsafeForeignPtrToPtr . castForeignPtr . get_fptr
  uncast = cast_fptr_to_obj . castForeignPtr . unsafePerformIO . newForeignPtr_