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[project @ 2005-03-02 16:39:56 by ross]
[ghc-base.git]
/
Data
/
STRef.hs
diff --git
a/Data/STRef.hs
b/Data/STRef.hs
index
e25e8b5
..
b185493
100644
(file)
--- a/
Data/STRef.hs
+++ b/
Data/STRef.hs
@@
-24,14
+24,18
@@
module Data.STRef (
import Prelude
#ifdef __GLASGOW_HASKELL__
import Prelude
#ifdef __GLASGOW_HASKELL__
+import GHC.ST
import GHC.STRef
#endif
#ifdef __HUGS__
import Hugs.ST
import GHC.STRef
#endif
#ifdef __HUGS__
import Hugs.ST
-#endif
-
-import Data.Dynamic
+import Data.Typeable
-#include "Dynamic.h"
+#include "Typeable.h"
INSTANCE_TYPEABLE2(STRef,stRefTc,"STRef")
INSTANCE_TYPEABLE2(STRef,stRefTc,"STRef")
+#endif
+
+-- |Mutate the contents of an 'STRef'
+modifySTRef :: STRef s a -> (a -> a) -> ST s ()
+modifySTRef ref f = writeSTRef ref . f =<< readSTRef ref