This isn't a multimethod, it's a multiple-arity function. Anyway, you just
need to detect that someone has tried to define a multiple arity method and
change your definition accordingly. Something like below. I haven't
actually tried this code so it's almost definitely wrong but you get the
gist.
(defmacro deftry [& definition]
(if (vec? (second definition))
(let [[name args & body] definition]
`(defn ~name ~args
(try ~@body
(catch Error e#
(println "error caught:" e#)))))
(let [[name & definitions] definition]
`(defn ~name ~@(map (fn [[args body]] `(~args (try ~@body (catch
Error e# (println "err caught")))))
definitions)))))
On Sunday, August 31, 2014 8:26:12 PM UTC+10, Yehonathan Sharvit wrote:
>
> I tried to write a macro that wraps the code a function with a try/catch
> statement. It works fine for regular functions but it doesn't work for
> multimethods. I understand the reason, but I don't know how to fix it.
>
> Here is my code:
>
> (defmacro deftry [name args & body] "
> https://groups.google.com/forum/#!topic/clojurescript/To0AnQVC3lg";
> `(defn ~name ~args
> (try ~@body
> (catch Error e#
> (println "error caught:" e#)))))
>
>
> Usage:
> 1. regular function => it works fine
>
> (deftry foo []
> (throw (Error. "foo")))
>
>
> 2. multimethods => it breaks
> (deftry foo
> ([a] 3)
> ([] 5))
>
>
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