On May 28, 9:59 pm, "Sina K. Heshmati" <s...@khakbaz.com> wrote: > Hi Krukow, [snip] > The only member data _I'm_ able find are the ones that are passed to the > default constructor, namely at the time that the abstraction is reified. What > if I'd have to give create a member field that is not necessarily known by > the caller or instantiator. That is, it's the abstraction itself that has to > create and maintain the value of that field.
You mean something like a private field in Java that is not supplied as a constructor argument, but computed as a function of the other fields, and which is not necessarily accessible from callers. If I understand correctly what it is you want, I think you are moving away from Clojure, trying to somehow encapsulate an "object". See RH's note on encapsulation: "Encapsulation of information is folly. Fields are public. Use protocols/interfaces to avoid dependencies" [1]. Again, I believe that you can use gen-class if you really need to do this. > One of the abstraction that I was hoping to implement in Clojure is a > Scheme-like pair in order to demonstrate various memory management > techniques. Once we do (cons a b), an abstract pair should be made that only > contains a pointer to its location in memory: (tag address). Here's the pair > implementation [2] in Scheme R5RS. > So you want a mutable pair (fst, snd) where fst and snd can be mutated arbitrarily? This is definately not the Clojure way :) In Clojure, you'd either use a pair of atoms or refs, giving you managed mutability, or you'd simply write a functional pair. [snip] > Thank you very much, Krukow. It sure did help. > > Kind regards, > SinDoc Glad it did :) -- 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
