Ummm... Jean, I don't understand.
Recapitulation. As Herwig showed, the symbol has its metadata WITHOUT
evaluation:
user=> (meta (second (read-string "(def ^{:key (+ 1 1)} foo)")))
{:key (+ 1 1)}
"second", in the above expression, retrieves the symbol "foo", and reader
already set its metadata WITHOUT evaluation.
AFAIK, def is an special form (a built-in one? not a defined macro?), so,
it receives the symbol, foo, as is, without evaluating it, nor its
metadata, nothing more. No lisp evaluator yet.
Something inside def work, ACTIVELY get the symbol metadata, AND EVALUATES
it, and assign it to the var the def is defining. AFAIK, getting the
metadata of something, doesn't imply automatically its evaluation, as
Herwig example shows us.
This interpretation is aligned with:
http://clojure.org/special_forms
Any metadata on the symbol will be evaluated, and become metadata on the
var itself
that explicitly asserts that some evaluation will be conducted.
Am I right?
Angel "defandmetadata" Lopez :-)
On Tue, Mar 19, 2013 at 12:16 PM, Jean Niklas L'orange <
[email protected]> wrote:
>
>
> On Tuesday, March 19, 2013 11:49:45 AM UTC+1, ajlopez wrote:
>>
>> Thanks Jean!
>>
>> Yes, I did that test before my email.
>>
>> But my doubt is:
>>
>> What part is in charge of metadata evaluation?
>>
>
> As Herwig commented: The part which evaluates metadata is without doubt
> the lisp evaluator's work, the def macro does nothing magical here.
>
> A simple test to ensure that follows:
> (meta ^{:a (+ 1 1)} [:a :b])
> ;=> {:a 2}
>
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