Initial gut reaction: would like a shortcut syntax for opting in(or out), as this will be a very common use case. Suspect that most classes would rather have it than not, but that may be the Ruby programmer in me.
Stu > On Nov 13, 1:01 pm, Constantine Vetoshev <gepar...@gmail.com> wrote: >> On Nov 12, 7:10 am, Rich Hickey <richhic...@gmail.com> wrote: >> >>> [1]http://www.assembla.com/wiki/show/clojure/Datatypes >> >> Could you please elaborate on why you chose to make IPersistentMap an >> optional interface for deftype'd types, rather than making it >> automatic? >> > > Because we want to be able to use deftype to implement > PersistentHashMap and datatypes like it. > >> I'm asking because I found the automatic defstruct-map equivalence >> convenient in writing the Cupboard database library (http://github.com/ >> gcv/cupboard). It guaranteed that any reading Clojure code could read >> back any map or any struct written by any other Clojure program >> (unless the map contains closures, of course), without any other >> knowledge of the writing program. It allows for data-centric designs >> when thinking about storing objects to a database, i.e., the data can >> be used without the type definitions which originally produced it. >> >> I can, of course, require that any deftype'd types saved in Cupboard >> databases implement IPersistentMap, but I'm curious about the >> reasoning for not making maps part of the default nature of deftype. >> Making IPersistentMap the default could also make deftype a nearly >> drop-in replacement for defstruct. >> > > Making it default, and having some way to opt out, is another > possibility. This is still an open question, as well as how to make > these default implementations more extensible. > > Rich > > -- > 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 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
