[Haskell-cafe] name for monad-like structure?

[Michael Vanier]

Luke Palmer wrote:
> On Tue, Apr 28, 2009 at 5:33 PM, Michael Vanier <mvanier42 at gmail.com 
> <mailto:mvanier42 at gmail.com>> wrote:
>
>     Tony Morris wrote:
>>     Michael Vanier wrote:
>>       
>>>     I've stumbled upon a structure that is like a weaker version of a
>>>     monad, one that supports return and >> but not >>=.  Has anyone seen
>>>     this before, and if so, does it have a standard name?
>>>
>>>     Mike
>>>
>>>
>>>     _______________________________________________
>>>     Haskell-Cafe mailing list
>>>     Haskell-Cafe at haskell.org <mailto:Haskell-Cafe at haskell.org>
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>>>
>>>         
>>     Are you sure it supports
>>     (>>) :: m a -> m b -> m b
>>
>>     and not
>>     mplus :: m a -> m a -> m a ?
>>
>>       
>     Yeah, you're right.  It's basically a monad where the type a is
>     fixed to be (), so you just have
>
>     (>>) :: m () -> m () -> m ()
>
>
> That's a monoid.
>
> Luke
>
Got it.  Thanks.

Mike


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