Technically, there's no possibility of variable capture, but you
should use gensyms:
(defmacro defrecord-ifn [name & args]
`(defrecord ~name ~...@args
clojure.lang.IFn
(invoke [this# key#] (get this# key#))))
Thanks,
Alyssa
On Dec 30, 9:29 pm, Alex Baranosky <alexander.barano...@gmail.com>
wrote:
> 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?
>
> Alex
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