    {-# LANGUAGE DeriveDataTypeable, EmptyDataDecls, ForeignFunctionInterface #-}
    -- |
    -- Module      : Data.Text.ICU.Collate.Internal
    -- Copyright   : (c) 2010 Bryan O'Sullivan
    --
    -- License     : BSD-style
    -- Maintainer  : bos@serpentine.com
    -- Stability   : experimental
    -- Portability : GHC
    --
    -- Internals of the string collation infrastructure.

    module Data.Text.ICU.Collate.Internal
        (
        -- * Unicode collation API
          MCollator(..)
        , Collator(..)
        , UCollator
        , withCollator
        , wrap
        ) where

    import Data.Typeable (Typeable)
    import Foreign.ForeignPtr (ForeignPtr, withForeignPtr)
    import Foreign.Ptr (FunPtr, Ptr)
    import Data.Text.ICU.Internal (newICUPtr)

    -- $api
    --

    data UCollator

    -- | String collator type.
    data MCollator = MCollator {-# UNPACK #-} !(ForeignPtr UCollator)
                     deriving (Typeable)

    -- | String collator type.
    newtype Collator = C MCollator
        deriving (Typeable)

    withCollator :: MCollator -> (Ptr UCollator -> IO a) -> IO a
    withCollator :: forall a. MCollator -> (Ptr UCollator -> IO a) -> IO a
    withCollator (MCollator ForeignPtr UCollator
    col) Ptr UCollator -> IO a
    action = ForeignPtr UCollator -> (Ptr UCollator -> IO a) -> IO a
    forall a b. ForeignPtr a -> (Ptr a -> IO b) -> IO b
    withForeignPtr ForeignPtr UCollator
    col Ptr UCollator -> IO a
    action
    {-# INLINE withCollator #-}

    wrap :: IO (Ptr UCollator) -> IO MCollator
    wrap :: IO (Ptr UCollator) -> IO MCollator
    wrap = (ForeignPtr UCollator -> MCollator)
    -> FinalizerPtr UCollator -> IO (Ptr UCollator) -> IO MCollator
    forall a i.
    (ForeignPtr a -> i) -> FinalizerPtr a -> IO (Ptr a) -> IO i
    newICUPtr ForeignPtr UCollator -> MCollator
    MCollator FinalizerPtr UCollator
    ucol_close
    {-# INLINE wrap #-}

    foreign import ccall unsafe "hs_text_icu.h &__hs_ucol_close" ucol_close
        :: FunPtr (Ptr UCollator -> IO ())