HROOT-0.7: src/HROOT/Class/TDatime/Interface.hs

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

-- module HROOT.Class.Interface where

module HROOT.Class.TDatime.Interface where


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

import HROOT.Class.TDatime.RawType

import HROOT.Class.Deletable.Interface


class (IDeletable a) => ITDatime a where

    convert :: a -> Int -> IO Word 

    setTDatime :: a -> Word -> IO () 

instance Existable TDatime where
  data Exist TDatime = forall a. (FPtr a, ITDatime a) => ETDatime a

upcastTDatime :: (FPtr a, ITDatime a) => a -> TDatime
upcastTDatime h = let fh = get_fptr h
                      fh2 :: ForeignPtr RawTDatime = castForeignPtr fh
                  in cast_fptr_to_obj fh2