[Haskell-cafe] Functors and the Visitor Pattern

Andres Loeh andres at cs.uu.nl
Wed Jun 3 10:21:58 EDT 2009

> Although, now I'm second guessing myself, because I can't figure out how we
> could create some design pattern that simulates an applicative functor. I'm
> pretty sure the Visitor pattern doesn't take you this far (but I am willing
> to be corrected). So, is there a way to create applicative functors in
> non-functional languages? What would that pattern look like?

Perhaps this paper can answer your question:

Jeremy Gibbons, Bruno C.d.S. Oliveira
The essence of the Iterator pattern



Andres Loeh, Universiteit Utrecht

mailto:andres at cs.uu.nl     mailto:mail at andres-loeh.de

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