thanks everybody for the responses .. with macros around ... you just have
to wish for it to get it .. but we need to be careful what we wish for :)
Sunil.
On Fri, Dec 31, 2010 at 8:18 AM, Alyssa Kwan <alyssa.c.k...@gmail.com>wrote:
> 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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