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

-- module HROOT.Class.Interface where

module HROOT.Class.TGraphErrors.Interface where


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

import HROOT.Class.TGraphErrors.RawType

import HROOT.Class.TGraph.Interface


class (ITGraph a) => ITGraphErrors a where

instance Existable TGraphErrors where
  data Exist TGraphErrors = forall a. (FPtr a, ITGraphErrors a) => ETGraphErrors a

upcastTGraphErrors :: (FPtr a, ITGraphErrors a) => a -> TGraphErrors
upcastTGraphErrors h = let fh = get_fptr h
                           fh2 :: ForeignPtr RawTGraphErrors = castForeignPtr fh
                       in cast_fptr_to_obj fh2