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createSystemRandom #22

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merged 1 commit into from Sep 11, 2013
Merged

createSystemRandom #22

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6 changes: 6 additions & 0 deletions System/Random/MWC.hs
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Expand Up @@ -69,6 +69,7 @@ module System.Random.MWC
, create
, initialize
, withSystemRandom
, createSystemRandom

-- ** Type helpers
-- $typehelp
Expand Down Expand Up @@ -441,6 +442,11 @@ withSystemRandom act = do
warned = unsafePerformIO $ newIORef False
{-# NOINLINE warned #-}

-- | Seed a PRNG with data from the system's fast source of pseudo-random
-- numbers. All the caveats of 'withSystemRandom' apply here as well.
createSystemRandom :: IO GenIO
createSystemRandom = withSystemRandom (return :: GenIO -> IO GenIO)

-- | Compute the next index into the state pool. This is simply
-- addition modulo 256.
nextIndex :: Integral a => a -> Int
Expand Down