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Support base < 4.6 / GHC 7.4. #12

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Merged
merged 1 commit into from
Aug 25, 2014
Merged

Support base < 4.6 / GHC 7.4. #12

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15 changes: 14 additions & 1 deletion System/Random.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -93,7 +93,11 @@ import Data.Ratio ( numerator, denominator )
#endif
import Data.Char ( isSpace, chr, ord )
import System.IO.Unsafe ( unsafePerformIO )
import Data.IORef
import Data.IORef ( IORef, atomicModifyIORef, newIORef, readIORef
, writeIORef )
#if MIN_VERSION_base (4,6,0)
import Data.IORef ( atomicModifyIORef' )
#endif
import Numeric ( readDec )

#ifdef __GLASGOW_HASKELL__
Expand All @@ -105,6 +109,15 @@ build :: ((a -> [a] -> [a]) -> [a] -> [a]) -> [a]
build g = g (:) []
#endif

#if !MIN_VERSION_base (4,6,0)
atomicModifyIORef' :: IORef a -> (a -> (a,b)) -> IO b
atomicModifyIORef' ref f = do
b <- atomicModifyIORef ref
(\x -> let (a, b) = f x
in (a, a `seq` b))
b `seq` return b
#endif

-- The standard nhc98 implementation of Time.ClockTime does not match
-- the extended one expected in this module, so we lash-up a quick
-- replacement here.
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