On Mar 9, 5:04 am, Timothy Pratley <timothyprat...@gmail.com> wrote:
> Hi Paul,
>
> > I actually mentioned the cycle function in my message, and that's what
> > I was using, but the original question came up because accessing the
> > nth item in a list takes linear rather than constant time.
>
> Apologies for not reading your post carefully. Indeed I think your
> cyclic-vector solution is great.
>
> > I'd be interested to hear how what I was attempting violates the
> > spirit of clojure. I was trying to work within the bounds of an
> > existing abstraction, and to implement my changes in such a way as to
> > not break other things that consume that abstraction.
>
> Interop with Java is a real strength of Clojure. But doing so is less
> useful for learning Clojure and more useful for learning Java. Feel
> free to pursue it, Java interop is certainly not wasted effort/
> knowledge. It certainly doesn't violate the spirit of Clojure, my
> words were intended in relation to writing Euler solutions in a non-
> Java way.
>
> > Incidentally, I don't believe the error I'm getting from proxy has
> > anything to do with IPersistentVector being an interface, since you
> > can clearly do:
>
> > (proxy [clojure.lang.IFn] [])
>
> Indeed you can, but you've really just created an empty object:
> user=> ((proxy [clojure.lang.IFn] []))
> java.lang.UnsupportedOperationException: invoke (NO_SOURCE_FILE:0)
>
> Now back to IPersistentVector for a moment:
> This class extends lots of interfaces. There is a name overlap between
> some of those Interfaces resulting in a very valid error "Duplicate
> method name&signature". Not a bug with proxy.
>
I really don't know why you are trying to dissuade Paul in all this.
What he is trying to do is perfectly fine and it does in fact look
like a bug in proxy. It is not an error to inherit a same-sig method
from more than one interface, but proxy is probably generating more
than one stub method, which is the error.
I'm prepping for my London QCon trip and don't have time to chase
this, but would appreciate it if a contributor could please file an
issue and look into this.
Thanks,
Rich
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