HROOT-core-0.9: src/HROOT/Core/TClass/Interface.hs

{-# LANGUAGE EmptyDataDecls, ExistentialQuantification,
  FlexibleContexts, FlexibleInstances, ForeignFunctionInterface,
  MultiParamTypeClasses, ScopedTypeVariables, TypeFamilies,
  TypeSynonymInstances #-}
module HROOT.Core.TClass.Interface where
import Data.Word
import Foreign.C
import Foreign.Ptr
import FFICXX.Runtime.Cast
import HROOT.Core.TClass.RawType
import HROOT.Core.TDictionary.Interface

class ITDictionary a => ITClass a

upcastTClass :: forall a . (FPtr a, ITClass a) => a -> TClass
upcastTClass h
  = let fh = get_fptr h
        fh2 :: Ptr RawTClass = castPtr fh
      in cast_fptr_to_obj fh2

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