[Haskell-cafe] What is MonadPlus good for?

[Remi Turk]

On Sat, Feb 12, 2005 at 01:47:06PM -0500, Benjamin Pierce wrote:
> > As a start, free access to countless general functions as soon as
> > you define a MonadPlus instance for your datatype. (Errr, `guard'
> > and `msum', as long as one stays within the Haskell98 standard
> > libraries ;)
> 
> Yes, those are good examples.  (But I'd still be interested to see some of
> the countless others... :-)
> 
> Thanks,
> 
>     - Benjamin

Network.URI and Data.Generics also define a few functions
which require MonadPlus instances. Can't find anything else right
now. Nor do I know of the (countless? ;)) more theoretical
reasons to define instances.

-- 
Nobody can be exactly like me. Even I have trouble doing it.