wow that's pretty epic!
=> (def f (call-fn "java.lang.String" "substring" "startpos" "endpos"))
#'runtime.q/f
=> (f "abcdef" 2 4)
"cd"
=> (f (str "123" "45") (+ 1 1) 4)
"34"
Thank you Meikel
On Tue, Feb 12, 2013 at 1:51 PM, Meikel Brandmeyer (kotarak)
<m...@kotka.de>wrote:
> Hi,
>
> if you want to resort to eval you can define your own function on the fly.
>
> (defn call-fn
> [& args]
> {:arglists ([class method & args])}
> (let [o (gensym)
> [class method & args] (map symbol args)]
> (eval
> `(fn [~o ~@args]
> (. ~(with-meta o {:tag class})
> (~method ~@args))))))
>
> user=> (set! *warn-on-reflection* true)
> true
> user=> (def f (call-fn "java.io.File" "renameTo" "dest"))
> #'user/f
> user=> (f (java.io.File. "foo") (java.io.File. "bar"))
> false
>
> Kind regards
> Meikel
>
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--
Please correct me if I'm wrong or incomplete,
even if you think I'll subconsciously hate it.
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