HROOT-core-0.8: src/HROOT/Core/TAttCanvas/Interface.hs

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

-- module HROOT.Class.Interface where

module HROOT.Core.TAttCanvas.Interface where


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

import HROOT.Core.TAttCanvas.RawType

import HROOT.Core.Deletable.Interface
---- ============ ----



class (IDeletable a) => ITAttCanvas a where

instance Existable TAttCanvas where
  data Exist TAttCanvas = forall a. (FPtr a, ITAttCanvas a) => ETAttCanvas a

upcastTAttCanvas :: (FPtr a, ITAttCanvas a) => a -> TAttCanvas
upcastTAttCanvas h = let fh = get_fptr h
                         fh2 :: ForeignPtr RawTAttCanvas = castForeignPtr fh
                     in cast_fptr_to_obj fh2

downcastTAttCanvas :: (FPtr a, ITAttCanvas a) => TAttCanvas -> a 
downcastTAttCanvas h = let fh = get_fptr h
                           fh2 = castForeignPtr fh
                       in cast_fptr_to_obj fh2