{-# LANGUAGE EmptyDataDecls, FlexibleInstances,
  MultiParamTypeClasses, TypeFamilies #-}
module STD.SharedPtr.Template where
import Foreign.C.Types
import Foreign.Ptr
import FFICXX.Runtime.Cast

data RawSharedPtr tp1

newtype SharedPtr tp1 = SharedPtr (Ptr (RawSharedPtr tp1))

class () => ISharedPtr tp1 where
        newSharedPtr0 :: IO (SharedPtr tp1)
        
        newSharedPtr :: tp1 -> IO (SharedPtr tp1)
        
        get :: SharedPtr tp1 -> IO tp1
        
        reset :: SharedPtr tp1 -> IO ()
        
        use_count :: SharedPtr tp1 -> IO CInt
        
        deleteSharedPtr :: SharedPtr tp1 -> IO ()

instance () => FPtr (SharedPtr tp1) where
        type Raw (SharedPtr tp1) = RawSharedPtr tp1
        get_fptr (SharedPtr ptr) = ptr
        cast_fptr_to_obj = SharedPtr

instance () => Castable (SharedPtr tp1) (Ptr (RawSharedPtr tp1))
         where
        cast x f = f (castPtr (get_fptr x))
        uncast x f = f (cast_fptr_to_obj (castPtr x))