hi JW,
First thank you for your reply.
my origin question is somethine about redis.here i refer
https://github.com/ptaoussanis/carmine
I follow this two line
(def server1-conn {:pool {<opts>} :spec {<opts>}}) ; See `wcar` docstring
for opts
(defmacro wcar* [& body] `(car/wcar server1-conn ~@body))
then I can exec some redis commands,but I want to exec commands dynamicly.
for example I here a vector [["foo" "bar"]["hello" "world"]]
i want to exec following commands
(wcar* (car/set "foo" "bar") (car/set "hello" "world"))
so i have write a macro like this
(defmacro batchly-redis [cmd params]
(let [car-fns (map #(cons cmd %) params)]
`(wcar* ~@car-fns)))
then I can invoke this macro using this way
(batchly-redis cat/set [["foo" "bar"]["hello" "world"]])
in this way,my macro works ok.but here my vector is coming from the return
of other fn ,so as you said above,this will not work, because marco
evaluates args at compile time.Do your have some ideas on my problem.
Really thanks
在 2014年2月24日星期一UTC+8下午6时29分09秒，Jozef Wagner写道：
>
> Well the evil thing is that apply-macro evaluates arguments at compile
> time. Example where this won't work follows
>
> (defn foo [numbers]
> (apply-macro + numbers))
>
> JW
>
>
> On Mon, Feb 24, 2014 at 10:27 AM, 刘家财 <jiaca...@gmail.com <javascript:>>wrote:
>
>> I have one problem using Clojure
>> we all know there is a apply for a fn to prepend intervening arguments to
>> args.
>> such as (apply + [2 3]) will equals to (+ 2 3)
>> this is really handy,
>> BUT,this is no apply-macro fn to use,I find a contrib(
>> https://github.com/clojure/clojure-contrib/blob/73accf597eafb8dfcb642702a3b98b057bbdbbdf/src/main/clojure/clojure/contrib/apply_macro.clj#L34)
>>
>> which has somethine like this,but deprecated.
>> and says it is evil,I can't understand why the docs says it was evil?
>> Is there anything harmful? Can someone show me some examples?
>> Thank U
>>
>>
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