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

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

-- module HROOT.Class.Interface where

module HROOT.Class.TPave.Interface where


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

import HROOT.Class.TPave.RawType

import HROOT.Class.TBox.Interface


class (ITBox a) => ITPave a where

instance Existable TPave where
  data Exist TPave = forall a. (FPtr a, ITPave a) => ETPave a

upcastTPave :: (FPtr a, ITPave a) => a -> TPave
upcastTPave h = let fh = get_fptr h
                    fh2 :: ForeignPtr RawTPave = castForeignPtr fh
                in cast_fptr_to_obj fh2