I didn't explain my question well enough. Suppose I define a macro
with defmacro and have several calls to it in my code. When are those
calls expanded to the code inside the macro? Is that at read-time?

On Mon, Apr 20, 2009 at 5:34 PM, Laurent PETIT <laurent.pe...@gmail.com> wrote:
>
> Hello,
>
> Apparently, no:
>
> 1:85 user=> (macroexpand-1 '(defn hello [] "world"))
> (def hello (clojure.core/fn ([] "world")))
> 1:86 user=> (read-string "(defn hello [] \"world\")")
> (defn hello [] "world")
> 1:87 user=>
>
> read-string did not expand defn.
>
> I think it's 'eval that expands macros and compiles forms.
>
> Regards,
>
> --
> Laurent
>
> 2009/4/21 Mark Volkmann <r.mark.volkm...@gmail.com>:
>>
>> In my Clojure article at http://ociweb.com/mark/clojure/article.html I say:
>>
>> "Clojure code is processed in three phases: read-time, compile-time
>> and run-time. At read-time the Reader reads source code and converts
>> it to a data structure, mostly a list of lists of lists .... At
>> compile-time this data structure is converted to Java bytecode. At
>> run-time the bytecode is executed. Functions are only invoked at
>> run-time. Macros are special constructs that look similar to
>> functions, but are expanded into new Clojure code at read-time."
>>
>> Is it correct to say that macros are expanded at read-time?

-- 
R. Mark Volkmann
Object Computing, Inc.

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