Data/STRef/Lazy.hs

{-# LANGUAGE Safe #-}

-----------------------------------------------------------------------------
-- |
-- Module : Data.STRef.Lazy
-- Copyright : (c) The University of Glasgow 2001
-- License : BSD-style (see the file libraries/base/LICENSE)
-- 
-- Maintainer : libraries@haskell.org
-- Stability : experimental
-- Portability : non-portable (uses Control.Monad.ST.Lazy)
--
-- Mutable references in the lazy ST monad.
--
-----------------------------------------------------------------------------

module Data.STRef.Lazy (
 -- * STRefs
 ST.STRef, -- abstract
 newSTRef,
 readSTRef,
 writeSTRef,
 modifySTRef
 ) where

import Control.Monad.ST.Lazy
import qualified Data.STRef as ST

newSTRef :: a -> ST s (ST.STRef s a)
readSTRef :: ST.STRef s a -> ST s a
writeSTRef :: ST.STRef s a -> a -> ST s ()
modifySTRef :: ST.STRef s a -> (a -> a) -> ST s ()

newSTRef = strictToLazyST . ST.newSTRef
readSTRef = strictToLazyST . ST.readSTRef
writeSTRef r a = strictToLazyST (ST.writeSTRef r a)
modifySTRef r f = strictToLazyST (ST.modifySTRef r f)