[Haskell-cafe] do you have to use fix with forkio?
Martijn van Steenbergen
martijn at van.steenbergen.nl
Sat Mar 7 17:12:36 EST 2009
Derek Elkins wrote:
> Both are poorish style.
> reader <- forkIO $ forever $ do (nr', line) <- readChan; when (nr /= nr') $ putStrLn hdl line
This is fine assuming you always want to re-enter the loop. If you want
to loop conditionally (which is most often the case), forever isn't
going to work, unless you use exceptions.
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