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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