shithub: MicroHs

ref: 4ce38e41a9f2f99c2fedf260039839e18bbe1d94
dir: /tests/IOArray.hs/

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module IOArray(main) where
import Prelude
import Data.IOArray
import Data.IORef
import System.IO

main :: IO ()
main = do
  a <- newIOArray 10 0
  s <- sizeIOArray a
  print s
  mapM_ (\ i -> writeIOArray a i (i*i)) [0..9]
  xs <- mapM (readIOArray a) [0..9]
  print xs
  o <- openFile "arr.tmp" WriteMode
  hSerialize o a
  hClose o
  i <- openFile "arr.tmp" ReadMode
  a' <- hDeserialize i
  xs' <- mapM (readIOArray a') [0..9]
  print $ xs == xs'

  r <- newIORef "foo"
  s1 <- readIORef r
  print s1
  writeIORef r "bar"
  s2 <- readIORef r
  print s2