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

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

-- module HROOT.Class.Interface where

module HROOT.Core.TClass.Interface where


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

import HROOT.Core.TClass.RawType

import HROOT.Core.TDictionary.Interface
---- ============ ----



class (ITDictionary a) => ITClass a where

instance Existable TClass where
  data Exist TClass = forall a. (FPtr a, ITClass a) => ETClass a

upcastTClass :: (FPtr a, ITClass a) => a -> TClass
upcastTClass h = let fh = get_fptr h
                     fh2 :: ForeignPtr RawTClass = castForeignPtr fh
                 in cast_fptr_to_obj fh2

downcastTClass :: (FPtr a, ITClass a) => TClass -> a 
downcastTClass h = let fh = get_fptr h
                       fh2 = castForeignPtr fh
                   in cast_fptr_to_obj fh2