I should really check the source before replying. EmptyList does indeed implement ISeq, so my argument doesn't hold.
Phil On 3 September 2012 07:01, Philip Potter <[email protected]> wrote: > 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
