;;; there is a simple, but not a good way
;;; (deftry foo [x] x)
;;; (:arglists (meta #'foo)) => ([& args__5399__auto__])
(defmacro deftry [name & fdecl]
`(defn ~name [& args#]
(try
(apply (fn ~@fdecl) args#)
(catch Error e#
(println "err caught" e#)))))
;;; this is much more better
;;; (deftry foo [x] x)
;;; (:arglists (meta #'foo)) => ([x])
(defn wrap-try [f]
(fn [& args]
(try
(apply f args)
(catch Error e
(println "err caught" e)))))
(defmacro deftry [& fdecl]
`(doto
(defn ~@fdecl)
(alter-var-root wrap-try)))
On Sunday, August 31, 2014 6:26:12 PM UTC+8, 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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