Is it because you're expansion returns the symbol and not the function.
('inc 2)
returns nil which is what I think is happening.
________________________________________
From: clojure@googlegroups.com [clojure@googlegroups.com] on behalf of Tassilo
Horn [t...@gnu.org]
Sent: 22 October 2013 10:37
To: clojure@googlegroups.com
Subject: Macro problem: passing a function to a macro
Hi all,
I'd like to have a macro that I can call and pass it some function that
the macro uses inside. Concretely, the macro iterates over some class
model and should expand to a ns declaration with one defn per class in
the model. Currently, the macro calls a generate-defn-for-class
function internally that returns a valid defn-form like so.
(defmacro mymacro [model-file]
(let [model (load-model model-file)]
`(do
;; ...
~@(for [class model]
(generate-defn-for-class class)))))
That works fine, but now I have a similar use-case where different defns
have to be generated. So I'd like to refactor my macro so that I can
pass it a defn-generating function. However, that doesn't seem to work.
Here's a super-minimal version of what I'm trying to do:
(defmacro do-do [x afn]
`(do ~(afn x)))
So when I'd call it like
(do-do 1 inc)
I'd expect it to expand to (do 2). However, it expands to (do nil).
Why is that?
Bye,
Tassilo
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