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

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

-- module HROOT.Class.Interface where

module HROOT.Core.TArray.Interface where


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

import HROOT.Core.TArray.RawType

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



class (IDeletable a) => ITArray a where

instance Existable TArray where
  data Exist TArray = forall a. (FPtr a, ITArray a) => ETArray a

upcastTArray :: (FPtr a, ITArray a) => a -> TArray
upcastTArray h = let fh = get_fptr h
                     fh2 :: ForeignPtr RawTArray = castForeignPtr fh
                 in cast_fptr_to_obj fh2

downcastTArray :: (FPtr a, ITArray a) => TArray -> a 
downcastTArray h = let fh = get_fptr h
                       fh2 = castForeignPtr fh
                   in cast_fptr_to_obj fh2