Thanks to both for the responses, but I stil not clearly understand.
The documentation says very clearly that:
In addition to with-meta, there are a number of reader macros (The Reader:
Macro Characters) for applying metadata to the expression following it:
^{:doc "How obj works!"} obj - Sets the metadata of obj to the provided map.
Equivalent to (with-meta obj {:doc "How obj works!"})
(def foo ^:abc [1 2 3]) -> (meta foo) -> {:abc true}
(def foo ^:abc some-func) -> (meta foo) -> nil
(def foo ^:abc 'some-symbol) -> (meta foo) -> nil (In clojure programming
book uses example attaching metadata using the reader to the symbol, but
seems it not works as expected)
Is a little bit confusing. The metadata documentation says clearly that are
equivalent, but are not equivalent.
Thank you very much again.
Regards.
Andrey
2015-05-05 21:49 GMT+02:00 Andy- <andre.r...@gmail.com>:
> In addition to James comment: IMO clojure.org/metadata should be clearer
> about this. It's mentioned more clearly on the reader page:
> http://clojure.org/reader#The%20Reader--Macro%20characters
> "The metadata reader macro first reads the metadata and attaches it to
> the next form read (see with-meta
> <http://clojure.github.io/clojure/clojure.core-api.html#clojure.core/with-meta>
> to
> attach meta to an object):"
>
> Stress on *next form read*.
>
> On Tuesday, May 5, 2015 at 2:31:40 PM UTC-4, Andrey Antukh wrote:
>>
>> Hi!
>>
>> I have some trouble with clojure metadata / reader and I do not know if
>> I'm doing something wrong.
>>
>> I have this code:
>>
>> (defn some-func [])
>>
>> (def func ^:abc some-func)
>>
>> (assert (= (meta func) {:abc true}))
>>
>> (def data [[:bar (with-meta some-func {:abc true})]
>> [:baz ^:abc some-func]])
>>
>> (assert (= (meta (get-in data [0 1])) {:abc true}))
>> (assert (= (meta (get-in data [1 1])) {:abc true}))
>>
>> It fails in the first assert and in the last (if I comment the first one
>> obviously). I do not understand why that form of metadata does not works
>> as I expect (http://clojure.org/metadata)
>>
>> Thank you very much.
>>
>> Regards.
>> Andrey
>>
>> --
>> Andrey Antukh - Андрей Антух - <andrei....@kaleidos.net> / <ni...@niwi.be
>> >
>> http://www.niwi.be <http://www.niwi.be/page/about/>
>> https://github.com/niwibe
>>
>
--
Andrey Antukh - Андрей Антух - <andrei.anto...@kaleidos.net> / <n...@niwi.be
>
http://www.niwi.be <http://www.niwi.be/page/about/>
https://github.com/niwibe
--
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.
