The docs you quoted seem to answer your question. Not all lists are valid seqs. In particular, the empty list is a valid list but not a valid seq. So if the empty list implemented ISeq, it would be lying. If the empty list implements IPersistentList, then IPersistentList can't implement ISeq.
Phil On Sep 3, 2012 12:44 AM, "Andrei Zhlobich" <[email protected]> wrote: > Why IPersistentList doesn't extend ISeq? > > Clojure docs say: > >> Lists are collections. They implement the ISeq interface directly > (except for the empty list, which is not a valid seq) > > At this moment EmptyList implements ISeq, but PersistentList doesn't. It > seems very strange for me. > Also PersistentQueue implements IPersistentList, but semantically it is > not a list. > > I think we can do 2 changes in hierarchy: > 1) extend IPersistentList from ISeq; > 2) extend PersistentQueue directly from IPersistentStack instead of > IPersistentList. > > Is it possible? > > -- > 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 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
