[Haskell-cafe] global, modifiable variable for debugging
michael at snoyman.com
Sun Dec 26 21:04:17 CET 2010
I think something like this would work:
myFlag = unsafePerformIO $ do
[x] <- getArgs
return $ x == "debug"
In general, unsafePerformIO should be avoided, but this is one of
those situations where we can give you a pass ;).
On Sun, Dec 26, 2010 at 9:53 PM, <briand at aracnet.com> wrote:
> I have a program with a debug flag in it (Strangely I've yet to be
> able to write bug-free code). I'd like to change the state of the
> debug flag based on command line args.
> I looked at IOVar but that would cause all the pure procedures to get
> swallowed by the IO Monad.
> Is a better way to get this behavior ?
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