Of course I find it two minutes after I send the question.
Sorry for the two noop emails.
Nick
On 8/30/06, Nicolas Frisby <[EMAIL PROTECTED]> wrote:
I'm using the following code in some of my projects:
> newtype MonadPlusAsMonoid a = MPM { unMPM :: a }
> instance MonadPlus m => Monoid (MonadPlusAsMonoid (m a)) where
> mempty = MPM mzero
> MPM l `mappend` MPM r = MPM (l `mplus` r)
Is there some sort of pitfall I'm not considering?
It seems fine to me, but I ask because I couldn't find this instance
in the darcs repo for the next base library package. I expected to
find it there because it has similar instances for numbers as monoids
(e.g. Sum and Product from Data.Monoid).
Thanks,
Nick
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