Control/Monad/ST.hs

{-# LANGUAGE CPP, SafeImports #-}
#if sh_SAFE_DEFAULT
{-# LANGUAGE Safe #-}
#endif

-----------------------------------------------------------------------------
-- |
-- Module : Control.Monad.ST
-- 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 (requires universal quantification for runST)
--
-- This library provides support for /strict/ state threads, as
-- described in the PLDI \'94 paper by John Launchbury and Simon Peyton
-- Jones /Lazy Functional State Threads/.
--
-----------------------------------------------------------------------------

module Control.Monad.ST (
 module Control.Monad.ST.Safe
#if !sh_SAFE_DEFAULT
 -- * Unsafe Functions
 , unsafeInterleaveST
 , unsafeIOToST
 , unsafeSTToIO
#endif
 ) where

import safe Control.Monad.ST.Safe

#if !sh_SAFE_DEFAULT
import qualified Control.Monad.ST.Unsafe as U

{-# DEPRECATED unsafeInterleaveST, unsafeIOToST, unsafeSTToIO
 "Please import from Control.Monad.ST.Unsafe instead; This will be removed in the next release"
 #-}

{-# INLINE unsafeInterleaveST #-}
unsafeInterleaveST :: ST s a -> ST s a
unsafeInterleaveST = U.unsafeInterleaveST

{-# INLINE unsafeIOToST #-}
unsafeIOToST :: IO a -> ST s a
unsafeIOToST = U.unsafeIOToST

{-# INLINE unsafeSTToIO #-}
unsafeSTToIO :: ST s a -> IO a
unsafeSTToIO = U.unsafeSTToIO
#endif