{-# LANGUAGE ForeignFunctionInterface, TypeFamilies, MultiParamTypeClasses, 
             FlexibleInstances, TypeSynonymInstances, 
             EmptyDataDecls, ExistentialQuantification, ScopedTypeVariables #-}

-- module HROOT.Class.Interface where

module HROOT.Class.TAttBBox.Interface where


import Data.Word
import Foreign.ForeignPtr
import HROOT.TypeCast

import HROOT.Class.TAttBBox.RawType

import HROOT.Class.Deletable.Interface


class (IDeletable a) => ITAttBBox a where

instance Existable TAttBBox where
  data Exist TAttBBox = forall a. (FPtr a, ITAttBBox a) => ETAttBBox a

upcastTAttBBox :: (FPtr a, ITAttBBox a) => a -> TAttBBox
upcastTAttBBox h = let fh = get_fptr h
                       fh2 :: ForeignPtr RawTAttBBox = castForeignPtr fh
                   in cast_fptr_to_obj fh2