[Haskell-cafe] name for monad-like structure?
lrpalmer at gmail.com
Tue Apr 28 19:42:10 EDT 2009
On Tue, Apr 28, 2009 at 5:33 PM, Michael Vanier <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?
> Haskell-Cafe mailing listHaskell-Cafe at haskell.orghttp://www.haskell.org/mailman/listinfo/haskell-cafe
> 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.
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