defmulti is a defonce?

[hiskennyness]

I just killed two hours trying to figure out why my tweaks to the dispatch function of defmulti did not work. Finally got the feeling I had found a bug in Clojure, but then I found a comment somewhere saying it is a feature, effectively a defonce (and, yes, looking at the source I see it does not do anything if it is already defined).

Shucks, could we get a warning or some doc on this?

But I am a Lisper, I am used to this. The classic is the initform to a class-allocated variable in defclass. :)

-kt

[Gary Trakhman]

I usually work around this by putting the dispatch in a separate def and referencing the var within defmulti.

(defmulti my-multi #'my-dispatch)

It's barely slower for the extra var dereference and very convenient for development.

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[Kenneth Tilton]

Pure genius. :) And once I have the method working as I want I can swap in the code.

Thx! -kt

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