On Thu, Feb 25, 2010 at 9:57 AM, hadley wickham <h.wick...@gmail.com> wrote: >> Presumably if I ask for p$a or p$b later, it's because I'm interesting >> in the value of "p$a" or "p$b" that I specifically put inside that >> environment. Otherwise I would just ask for "a" or "b". If I'm >> asking for "p$b" it the above case, that means I forgot to declare b >> inside p. In this case there should be an error telling me that, not >> a silent substitution of the wrong quantity. >> >> If someone wanted to do the y$ls() thing, they could always >> >>> y <- proto(a=1) >>> with(y, ls()) >> [1] "a" >> >> Another reason is that there are plenty of other programming languages >> that have similar structures and this behavior is very odd. In >> standard languages asking for "b" inside the "p" object gives you an >> error, and no one complains. > > You might want to have a look at the mutatr package which implements > prototype OO with the behaviour you're looking for (I think). I also > have a paper available if you email me off list.
I think his objection is really only that he must specify baseenv() to get the behavior he prefers but from what I understand (I am basing this on my understanding that mutatr works like io language) in mutatr one must use Object which seems really no different. ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
