Is there a way to define methods of classes that can only be called from objects belonging to the same class without defining them as public?

i.e., something like public but only for objects of the same class.

@pocmatos I recommend using define-local-member-name for this

Hi everyone! Just started recently using Racket for a personal project (and liking it so far!)… Little question: I need a map from keys to values, but also need to preserve the order of insertion. I was about to implement it myself as a list of pairs but I am actually wondering: is there any builtin Racket data structure suitable for that? Many thanks! :slightly_smiling_face:

@dnf85 I think that the ddict package gives you that: http://docs.racket-lang.org/ddict/index.html

Oh right, saw that few mins ago, but just wanted to make sure! thanks!

~you can also use the racket/dict interface (to a list of pairs)~ (nvm, I don’t think its guaranteed to preserve order)

you mean I can implement my own data structure and then make it implement that interface? (still don’t know how interfaces work in Racket unfortunately, still reading Realm of Racket)

oh OK :slightly_smiling_face:

I’ll look at ddict then!

dnf85: http://pasterack.org/pastes/22038

Thanks! Yes, looks like it does preserve ordering (I played around with the example)… not entirely sure what happens if you remove/add something though. Will look into it.

yep, looks like this is what I want! will use association list as I wanted to do initially but can also use all the stuff provided by Racket since it is a ‘dict?’ Cool! (and, after more tests, looks like there’s no problem with the ordering) :slightly_smiling_face:

Thanks!