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  1. import Data.IORef
  2.  
  3. runClosure f = mapM_ f [0..5]
  4.  
  5. main = do
  6.   x <- newIORef (0, (+ 1))
  7.   runClosure $ \i -> do
  8.     (n,f) <- readIORef x
  9.     print $ f n
  10.     writeIORef x (f n, if i `mod` 2 == 0 then (+ 1) else (* 2))
Success #stdin #stdout 0.01s 3548KB
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https://ideone.com/72ySa
language:
Haskell (ghc 8.4.4)
created:
12 years ago
visibility:
secret

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