Re: [Haskell-cafe] Unit and pair

FullBinaryTreeRelation? :P On Tue, May 8, 2012 at 1:36 PM, MigMit wrote:

Hi café, a quick question.

Is there a somewhat standard class like this:

class Something c where unit :: c () () pair :: c x y -> c u v -> c (x, u) (y, v)

?

I'm using it heavily in my current project, but I don't want to repeat somebody else's work, and it seems general enough to be defined somewhere; but my quick search on Hackage didn't reveal anything.

I know about arrows; this, however, is something more general, and it's instances aren't always arrows. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe