Generating readable code for IDEs is not a good reason. You should
think carefully about variable capture and decide which you want.
Usually, in a macro-generated defn, I do want to capture the
parameters, so I would use ~'this.
On Dec 30, 11:54 pm, André Thieme <splendidl...@googlemail.com> wrote:
> Am 31.12.2010 03:29, schrieb Alex Baranosky:
>
>
>
>
>
> > 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?
>
> Others have already pointed to this# .
> I just would like to add that you can as well use ~'this in some
> cases, where your macros generate defns. The advantage is that some
> editors (like emacs) will show you the parameter vector and that would
> show a useful name and not this_auto_foobarbaz123456 .
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