On Monday, March 23, 2015 at 6:58:27 PM UTC+11, Mike Thompson wrote:
> I have a macro:
>
> (defmacro m
> [x]
> `(if-not ^boolean js/goog.DEBUG ~x)) ;;; NOTICE the type hint
>
>
> I use it:
>
> (macroexpand-1 '(m blah))
> ;; => (clojure.core/if-not js/goog.DEBUG blah)
>
> Notice how the type hint is gone. But I need that type hint there otherwise
> the if test on js/goog.DEBUG doesn't work.
>
For the record ... after waaaaaaay too much messing about, I had to do it this
way:
(ns some.namespace)
;; wrap in a function, with the right type hint
(defn ^boolean debug?
[]
js/goog.DEBUG)
;; use this in the macro ...
(defmacro m
[x]
`(if (some.namespace/debug?) ~x))
The Google Closure compiler does deadcode eliminate the "x" if you do it this
way. And it avoids the complete nightmare of getting a type hint added to
js/goog.DEBUG through a macro (which seems impossible to me).
Question: why exactly is this type hint needed when js/goog.DEBUG is used in
an "if"? As far as I can see, js/goog.DEBUG is a boolean already.
--
Mike
--
Mike
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