[Haskell-cafe] global, modifiable variable for debugging

[Michael Snoyman]

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 ;).

Michael

On Sun, Dec 26, 2010 at 9:53 PM,  <briand at aracnet.com> wrote:
> Hi,
>
> 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 ?
>
> Thanks,
>
> Brian
>
>
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