Argh! Six minutes! :P
On Dec 30, 9:42 pm, Alyssa Kwan <alyssa.c.k...@gmail.com> wrote:
> 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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