My apologies, I just realized that there is a clojurescript group. I will ask my question there.
2015-06-15 23:02 GMT-04:00 Damien Lepage <damienlep...@gmail.com>: > Hello, > > I found the following technique in order to have a record inheriting a > base behavior, using extend: https://gist.github.com/david-mcneil/661983 > > Unfortunately this can't work in ClojureScript at this point, due to the > lack of extend. Is there any alternative or should I fall back to bare > functions instead of defrecord? > > Maybe some context on my code would help you answer this question. > I transform some data through a pipeline of wrappers implementing this > protocol: > > (defprotocol Wrapper > (wrap-data [this data])) > > Some of my wrappers can be toggled on/off so I added this protocol: > > (defprotocol Togglable > (toggle [this]) > (on? [this])) > > Such a togglable wrapper would be implemented like this: > > (defrecord MyWrapper [on] > Togglable > (toggle [this] (update-in this [:on] not)) > (on? [this] on) > Wrapper > (wrap-data [this data] > (if on > (do-something data) > data))) > > Now I realized that my implementation for the Togglable protocol would > always be the same, so I would have liked a way to write the code only > once. The only solution I found to do that while keeping my Togglable > protocol, is the following macro: > > (defmacro deftogglable [name fields & specs] > `(defrecord ~name [~@fields ~'on] > ~'Togglable > (~'toggle [this#] (update-in this# [:on] not)) > (~'on? [~'this] ~'on) > ~@specs)) > > Which I can use like this: > > (macro/deftogglable MyWrapper [] > Wrapper > (wrap-data [this data] > (if on > (do-something data) > chart))) > > I don't like this approach too much because it's very specific and > wouldn't compose well, or allow overriding part of the functions. > > How would you go to solve this problem? > > Thanks > > Damien > > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
