On Tue, Jan 13, 2009 at 11:21 AM, Tim Newsham <news...@lava.net> wrote:
> I have seen several libraries where all functions of a monad have the >> monadic result (), e.g. Binary.Put and other writing functions. This is >> a clear indicator, that the Monad instance is artificial and was only >> chosen because of the 'do' notation. >> > > Maybe that was the initial reason, but I've actually found the > Binary.Put.PutM (where Put = PutM ()) to be useful. Sometimes > your putter does need to propogate a result... But that's the whole point of Writer! Take a monoid, make it into a monad. Put as a monad is silly. Luke
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