My or_maybe is just defined as
or_maybe (Just e) _ = Just e or_maybe Nothing f = f
which is pretty simple...
Indeed... I have been tending to do something similar inline...
I'm finding there's a tension between having lots of auxilliary functions and duplicated inline logic when it comes to code readability. If a (simple) function is available from a standard library, that tebds (in my mind) to suggest using the function provided, as that represents a recognized idiom.
At 13:21 15/12/03 +0100, Samuel Tardieu wrote:
I think there has been some misunderstanding here.
What the other posters wrote is that it is definitely available, but under the "mplus" name.
Aha? I looked for a MonadPlus instance of Maybe in the prelude, and didn't see it defined there. Is it defined in one of the standard libraries? Ah, now I see it is... I'm almost used to looking to the Control.Monad.<foo> libraries, I didn't think to check Control.Monad. Oops.
One day, I'll learn to look in all the right places.
#g
------------ Graham Klyne For email: http://www.ninebynine.org/#Contact
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