[project @ 2002-04-24 16:31:37 by simonmar]

[ghc-base.git] / Data / STRef.hs

diff --git a/Data/STRef.hs b/Data/STRef.hs
index 747d5ba..b3c4888 100644 (file)
--- a/Data/STRef.hs
+++ b/Data/STRef.hs
@@ -1,5 +1,5 @@
 -----------------------------------------------------------------------------
--- 
+-- |
 -- Module      :  Data.STRef
 -- Copyright   :  (c) The University of Glasgow 2001
 -- License     :  BSD-style (see the file libraries/core/LICENSE)
@@ -8,7 +8,7 @@
 -- Stability   :  experimental
 -- Portability :  non-portable (requires non-portable module ST)
 --
--- $Id: STRef.hs,v 1.2 2001/07/03 11:37:50 simonmar Exp $
+-- $Id: STRef.hs,v 1.4 2002/04/24 16:31:40 simonmar Exp $
 --
 -- Mutable references in the ST monad.
 --
@@ -18,7 +18,8 @@ module Data.STRef (
        STRef,          -- abstract, instance Eq
        newSTRef,       -- :: a -> ST s (STRef s a)
        readSTRef,      -- :: STRef s a -> ST s a
-       writeSTRef      -- :: STRef s a -> a -> ST s ()
+       writeSTRef,     -- :: STRef s a -> a -> ST s ()
+       modifySTRef     -- :: STRef s a -> (a -> a) -> ST s ()
  ) where
 
 import Prelude