active bindings and ls.str
On Tuesday 30 June 2009, Romain Francois wrote:
This was more of a question. I'd like to know if there is a way for objects to broadcast that they have changed. This would be very useful to for example implement an object browser in a front-end, which I guess is part of the reason for the trick ?
Yes, that's around half the reason. The other half is our data.frame-editor, which tries to create the illusion of "in-place" editing. For that it's pretty important to keep the editor data in sync with R's version of the data.frame. I would certainly like to see an easier way to detect changed objects as well.
The problem is as soon as you pass it to a function, you force the promise, maybe passing the symbol instead could do the trick, but I have not seen something that brings the information that an object is a promise. Maybe you are right and I am not supposed to play with them ...
Yes, passing the symbol does the trick, indeed. (And until a few minutes ago, there was a regression in RKWard in just that respect.) I'll have to admit that we do play with the internals of promises in RKWard, too: When the only reason that we forced a promise was that the object browser stepped on it, we "put it back" to free up the memory, again. This works remarkably well, but in fact I don't think we are supposed to do this... Regards Thomas -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 197 bytes Desc: This is a digitally signed message part. URL: <https://stat.ethz.ch/pipermail/r-devel/attachments/20090630/55e9d278/attachment.bin>