Thanks, Juan.
I don't need to know the length of the seq, though, only that it is lazy. I
don't want to realize *any* lazy seqs. Ideally, I'd like to be able to
print any data structure and have all lazy seqs print just like it does in
the example I gave above (i.e., "clojure.lang.LazySeq@c5d38b66"), whether
it is finite or infinite.
I also don't want to walk through every data structure to check if it
contains a lazy seq, but maybe that is the only option.
I've also tried:
(defmethod print-method clojure.lang.LazySeq [q, w]
(.write w "#clojure.lang.LazySeq"))
The next step might be to investigate why infinite lazy seqs don't print as
clojure.lang.LazySeq, like the finite ones.
On Monday, November 2, 2020 at 9:22:58 AM UTC-8 [email protected] wrote:
> Hi Austin,
>
> Since there is no way to know the length of a lazy-seq without realizing
> it, I think your only choice is to set a limit on it by binding
> *print-length* if you are not sure about the sequence.
>
> Other thing you can try is bounded-count like this :
>
> (defn looks-finite? [xs]
> (let [limit 1000]
> (< (bounded-count limit xs) limit)))
>
> (looks-finite? (map inc (range))) ;; => false
> (looks-finite? (map inc (range 100))) ;; => true
>
> I hope that helps.
>
> Juan
> El domingo, 1 de noviembre de 2020 a las 20:06:39 UTC-3, Austin Haas
> escribió:
>
>>
>> How can I make sure that a logging function won't try to realize an
>> infinite lazy seq that could be anywhere in the arguments passed to the
>> logging function?
>>
>> Is there some way to guarantee that lazy seqs won't be realized when
>> converting to a string?
>>
>> I know I can bind *print-length*, but I don't want to constrain every
>> collection.
>>
>> And I know that lazy seqs aren't always realized, but that doesn't seem
>> to help if they are infinite:
>>
>> user=> (str (map inc (range 10)))
>> "clojure.lang.LazySeq@c5d38b66"
>>
>> user=> (str (map inc (range)))
>> <never ends>
>>
>> Thanks.
>>
>>
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to [email protected]
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
[email protected]
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 [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/clojure/ab820e20-75ad-4852-aa01-9321cb7487b4n%40googlegroups.com.
