Re: [Proposal] Add default implementation of mappend/mempty in terms of mconcat

Am 27.01.2014 13:23, schrieb Joachim Breitner:

Hi,

Am Montag, den 27.01.2014, 11:42 +0100 schrieb Sjoerd Visscher:

...

This seems rather pointless; I’m having trouble coming up with an example where mconcat would be easier or more elegant to implement. Do you have an example?

maybe cases where you implement mconcat for performance reasons anyways (but are there good examples for that?),

I think it is useful to define a custom mconcat in cases where it matters whether it is a left or a right fold.

and then you don’t want to be bothered with the simple cases....