Why shouldn't that be the case? A seq is a collection of data. And it's immutable, why would it bein its own category of collections?
Timothy On May 13, 2013 3:45 PM, "Philip Potter" <philip.g.pot...@gmail.com> wrote: > On 13 May 2013 17:30, Timothy Baldridge <tbaldri...@gmail.com> wrote: > >>> In fact, the way that count works on ISeqs is rather roundabout -- it > > only works because all implementations of ISeq in clojure.jar also > > happen to implement java.util.List, so count calls Collection.size(). > > In theory, some user-provided ISeq which didn't implement List would > > not respond to count. > > > > ------ > > > > That is just completely untrue: > > > > > https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/RT.java#L536 > > > https://github.com/clojure/clojure/blob/master/src/clj/clojure/core.clj#L826 > > Thanks for the correction. > > I had read this code before and I read it again and couldn't see any > mistake, until I looked at ISeq and realized it implements > IPersistentCollection. That came as a surprise to me. > > I guess I'm used to treating seqs and colls as very separate ideas > that I simply didn't expect that ISeq would implement > IPersistentCollection. > > Phil > > > Timothy > > > > > > > > On Mon, May 13, 2013 at 10:17 AM, Philip Potter < > philip.g.pot...@gmail.com> > > wrote: > >> > >> In fact, the way that count works on ISeqs is rather roundabout -- it > >> only works because all implementations of ISeq in clojure.jar also > >> happen to implement java.util.List, so count calls Collection.size(). > >> In theory, some user-provided ISeq which didn't implement List would > >> not respond to count. > >> > >> It's probably a good idea for interop reasons to have seqs implement > >> the java collection types, but I don't feel too happy about clojure > >> code which uses the java Collection interface on seqs. > >> > >> Phil > >> > >> On 13 May 2013 15:48, Meikel Brandmeyer (kotarak) <m...@kotka.de> wrote: > >> > Hi, > >> > > >> > Am Montag, 13. Mai 2013 16:16:57 UTC+2 schrieb Sean Corfield: > >> >> > >> >> > >> >> So you think (count (map inc [1 2 3])) should be illegal? > >> >> > >> >> (I'm just trying to understand your logic here) > >> >> > >> > > >> > In the hardcore version, yes. In the practical version, probably not. > I > >> > never had to call count on a seq. (Various versions of partition-by or > >> > split > >> > being a notable exception.) (Still a promised O(1) count would be nice > >> > for > >> > reasoning as we have it for contains?. What is clojure.lang.Counted > good > >> > for > >> > anyway?) > >> > > >> > Meikel > >> > > >> > -- > >> > -- > >> > 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/groups/opt_out. > >> > > >> > > >> > >> -- > >> -- > >> 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/groups/opt_out. > >> > >> > > > > > > > > -- > > “One of the main causes of the fall of the Roman Empire was that–lacking > > zero–they had no way to indicate successful termination of their C > > programs.” > > (Robert Firth) > > > > -- > > -- > > 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/groups/opt_out. > > > > > > -- > -- > 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/groups/opt_out. > > > -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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