If it were me I'd avoid making 'topic a "magic symbol" and let the user
choose a symbol to bind. It'd look something like
(defmacro listen
[[topic-sym topic-name] & body]
`(on-message ~topicname
(fn [~topic-name] (~@body)))))
(listen [topic "topic-test"] (println topic "test))
this way it's relatively clear to the reader what the symbol is bound to
and where.
On Wed Dec 31 2014 at 1:41:41 PM Tobias Kortkamp <tobias.kortk...@gmail.com>
wrote:
>
> On 12/31/2014 18:56, rogergl wrote:
> > To make this work I had to replace the symbol 'topic in the body with
> > the gensym symbol. Is this the right way to do this ?
>
> Your macro is too complicated. You don't need to gensym a symbol in this
> case. Instead just quote a symbol before unquoting it (note the ~'), so
> that it appears as is in the resulting form:
>
> (defmacro listen
> [topic expression]
> `(on-message ~topic (fn [~'topic] ~expression)))
>
> Your example then expands to
>
> (on-message "topic-test" (fn [topic] (println topic "test")))
>
>
>
>
>
>
>
> --
> You received this message because you are subscribed to the Google
> Groups "Clojure" group.
> To post to this group, send email to clojure@googlegroups.com
> Note that posts from new members are moderated - please be patient with
> your first post.
> To unsubscribe from this group, send email to
> clojure+unsubscr...@googlegroups.com
> For more options, visit this group at
> http://groups.google.com/group/clojure?hl=en
> ---
> You received this message because you are subscribed to the Google Groups
> "Clojure" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to clojure+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
---
You received this message because you are subscribed to the Google Groups
"Clojure" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to clojure+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
