hakyll/src/Hakyll/Core/Item/SomeItem.hs

24 lines
812 B
Haskell
Raw Normal View History

2012-11-18 20:56:52 +00:00
--------------------------------------------------------------------------------
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE ExistentialQuantification #-}
module Hakyll.Core.Item.SomeItem
( SomeItem (..)
) where
--------------------------------------------------------------------------------
import Data.Binary (Binary)
import Data.Typeable (Typeable)
--------------------------------------------------------------------------------
import Hakyll.Core.Item
import Hakyll.Core.Writable
--------------------------------------------------------------------------------
-- | An existential type, mostly for internal usage.
data SomeItem = forall a.
(Binary a, Typeable a, Writable a) => SomeItem (Item a)
deriving (Typeable)