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

-- module HROOT.Class.Interface where

module HROOT.Graf.TGraphPolar.Interface where


import Data.Word
import Foreign.C
import Foreign.Ptr
import Foreign.ForeignPtr
import FFICXX.Runtime.Cast

import HROOT.Graf.TGraphPolar.RawType

import HROOT.Hist.TGraphErrors.Interface
---- ============ ----



class (ITGraphErrors a) => ITGraphPolar a where

instance Existable TGraphPolar where
  data Exist TGraphPolar = forall a. (FPtr a, ITGraphPolar a) => ETGraphPolar a

upcastTGraphPolar :: (FPtr a, ITGraphPolar a) => a -> TGraphPolar
upcastTGraphPolar h = let fh = get_fptr h
                          fh2 :: ForeignPtr RawTGraphPolar = castForeignPtr fh
                      in cast_fptr_to_obj fh2

downcastTGraphPolar :: (FPtr a, ITGraphPolar a) => TGraphPolar -> a 
downcastTGraphPolar h = let fh = get_fptr h
                            fh2 = castForeignPtr fh
                        in cast_fptr_to_obj fh2