Alex Baranosky <[email protected]> writes:
> I've been playing with making a macro to encapsulate Stuart's post, like this:
>
> (defmacro defrecord-ifn [name & args]
> `(defrecord ~name ~...@args
> clojure.lang.IFn
> (invoke [this key] (get this key))))
>
> (defrecord-ifn Foo [a b c])
>
> (def foo (Foo. "A" "B" "C"))
>
> (prn (map foo [:a :c])) => ("A", "C")
>
> I get the error:
>
> "No such var: user/this". I guess this is because it is expanding
> 'this' to 'user/this'. What is the proper way to get a macro like
> this to expand properly?
Use autogensym. Stick a # on the end of bindings you declare inside
syntax-quote: this# and key#.
(defmacro defrecord-ifn [name & args]
`(defrecord ~name ~...@args
clojure.lang.IFn
(invoke [this# key#] (get this# key#))))
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