Hi Herwig
Actually,defun just define a variadic arguments function,so it doesn't have
different arities. And when using defun macro ,it walk through the body
forms, find 'recur' forms and replace them with (recur (vector
...arguments)) instead.
A macroexpand-1 result of accum:
(macroexpand-1
'(defun accum
([0 ret] ret)
([n ret] (recur (dec n) (+ n ret)))
([n] (recur n 0))))
=>
(clojure.core/defn
accum
{:arglists '([0 ret] [n ret] [n])}
[& args__4602__auto__]
(clojure.core.match/match
[(clojure.core/vec args__4602__auto__)]
[[0 ret]]
(do ret)
[[n ret]]
(do (recur (vector (dec n) (+ n ret))))
[[n]]
(do (recur (vector n 0)))))
The core procedure is at
https://github.com/killme2008/defun/blob/master/src/defun.clj#L97-107
2014-09-15 0:15 GMT+08:00 Herwig Hochleitner <hhochleit...@gmail.com>:
> Hi Dennis,
>
> marrying core.match to defn is a pretty neat idea. Thanks for releasing it!
>
> I see that you actually extended defn in that you made it possible to
> recur between different arities.
> Can you give a quick rundown on how you made that work? Are the arities
> still separate IFn arities? Does it still run in constant stack space?
>
> kind regards
>
> PS @adrian: If you feel like "Friendly advice" ing someone, why not do so
> in a private email?
>
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Twitter: @killme2008
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