[Haskell-cafe] MonadPlus or Alternative or ...?

[Mark Wassell]

Check the laws that instances of MonadPlus and Alternative should comply 
with to help you make your decision.

Cheers

Mark

Sean Leather wrote:
> I want to generalize a set of functions from lists to some functor 
> type. I require the following three operation types.
>
>   f a
>   a -> f a
>   f a -> f a -> f a
>
> Should I choose MonadPlus and use these?
>
>   mzero
>   return
>   mplus
>
> Or should I choose Alternative and use these?
>
>   empty
>   pure
>   (<|>)
>
> Or should I make my own class? Or is there another option?
>
> Thanks,
> Sean
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