Hi, 2009/3/25 ninix <nitzan....@gmail.com>
> > Thanks. > > 1) The returned exception is misleading. For example, in the following > (contrived) case: > user=> (. obj (toString "")) > java.lang.IllegalArgumentException: No matching method found: toString > for class java.lang.Object > Since the member-symbol is not evaluated, shouldn't the exception be > (at least): ... method found: (toString ... ? Indeed. > 2) For runtime method resolution - Instead of calling the Clojure > reflector methods directly (as was suggested > in the discussion you mentioned) perhaps the dot form should attempt > to evaluate the member-symbol; it will use > the value if the evaluation succeeds and can still use the symbol name > (as it currently does) if the evalution fails > (e.g. the symbol is not bound). I think the special operator manipulates the symbol at compile time, where no runtime (as the evaluation of a complex expression) is possible. That's certainly as is for a performance reason. Maybe a more dynamic version of it (not requiring one to make calls to internal clojure java code) could have its place in clojure-contrib ? > > > > On Mar 25, 10:06 am, Laurent PETIT <laurent.pe...@gmail.com> wrote: > > Hello, > > > > No, it's not possible, dot (.) is a special form and disallows this. > > > > Search this mailing list for the subject "Help with the dot operator > special > > form" for a similar discussion on the ways to achieve more dynamic > (runtime) > > method resolution. > > > > HTH, > > > > -- > > Laurent > > > > 2009/3/25 ninix <nitzan....@gmail.com> > > > > > > > > > > > > > Hi, > > > > > Is there any way to get a "dynamic" member-symbol for use in the (.) > > > special form? > > > > > For example, I get the following exception: > > > user=> (def obj (Object.)) > > > #'user/obj > > > user=> (. obj (symbol "f")) > > > java.lang.IllegalArgumentException: No matching method found: symbol > > > for class java.lang.Object > > > > > I expected this to behave like: (. obj f), so I can change the > > > accessed member by changing the argument in (symbol ...), but was > > > surprised by the result... > > > > > Thanks > > > --~--~---------~--~----~------------~-------~--~----~ 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 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 -~----------~----~----~----~------~----~------~--~---
