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

-- module HROOT.Class.Interface where

module HROOT.Class.TCurlyArc.Interface where


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

import HROOT.Class.TCurlyArc.RawType

import HROOT.Class.TCurlyLine.Interface


class (ITCurlyLine a) => ITCurlyArc a where

instance Existable TCurlyArc where
  data Exist TCurlyArc = forall a. (FPtr a, ITCurlyArc a) => ETCurlyArc a

upcastTCurlyArc :: (FPtr a, ITCurlyArc a) => a -> TCurlyArc
upcastTCurlyArc h = let fh = get_fptr h
                        fh2 :: ForeignPtr RawTCurlyArc = castForeignPtr fh
                    in cast_fptr_to_obj fh2