And of course ,it still run in constant stack space just like normal recur
form.
P.S. I think adrian's advice is good, please forgive my poor english,and i
changes the description to ' a macro to define clojure functions with
pattern match just like erlang or elixir.
2014-09-15 0:26 GMT+08:00 dennis zhuang <killme2...@gmail.com>:
> 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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>
>
>
> --
> 庄晓丹
> Email: killme2...@gmail.com xzhu...@avos.com
> Site: http://fnil.net
> Twitter: @killme2008
>
>
>
--
庄晓丹
Email: killme2...@gmail.com xzhu...@avos.com
Site: http://fnil.net
Twitter: @killme2008
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