[Haskell-cafe] Using the ContT monads for early exits of IO ?

[Derek Elkins]

Or... one could just use the exceptions that are already built into
the IO monad...

2010/6/10 Yitzchak Gale <gale at sefer.org>:
> Lennart Augustsson wrote:
>> I would not use the continuation monad just for early exit.  Sounds
>> like the error monad to me.
>
> I.e., the Either/ErrorT monad. But the mtl/transformers packages
> have an orphan instance for Either that requires the
> exit type to be an instance of the Error class. If that
> doesn't work in your case, use the Exit monad:
>
> http://www.haskell.org/haskellwiki/New_monads/MonadExit
>
> Or use the Maybe monad written additively, i.e. mplus
> in place of >> (more or less).
>
> Regards,
> Yitz
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