I would like to add another idea right out of my head:
When you say you want to "hide from client code", juxtaposed to the
notion of "(def)type", a little warning manifests itself in my head,
because as far as I understand them, types are there to provide
polymorphic implementations for protocols. So protocols should be the
primary targets as an API for your clients, not types.
By being easily used as maps, types are very powerful because you can
use all the default clojure functions on them, but inside your
libraries and the codebase you own, would you like to change the
internals of the type fields". For "client code" ("client code" as
code you can't modify or for which modification is almost impossible
without annoying someone else), better stick to
interfaces/protocols/factory functions/methods. (or, as the others
have said, explicit "public API" accessor functions).
HTH,
--
Laurent
2010/4/11 Sophie <itsme...@hotmail.com>:
> (deftype A [x]) gives me an accessor (:x anA)
>
> Then I decide to change data representation of A without impacting
> client code, but I don't seem able to define a function
> (defn :x [anA] ...)
>
> Should I be doing something different?
>
> Thanks!
>
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