[Rd] R5 reference classes: how to initialize exactly?

[Simon Urbanek]

Just a clarification for posterity - R5 has nothing to do with the new reference classes. It's not even an official name, but informally it's a collection of ideas for an entirely new object system that can replace both S3 and S4 (not that it will but it should be seen as having the capability to do so technically). Reference classes are just an addition to S4.

Cheers,
Simon


On Nov 16, 2010, at 12:30 AM, Janko Thyson wrote:

> Sorry, I was stupid:
> 
> 
> 
> MyRefObj <- setRefClass("Blabla", .)
> 
> 
> 
> One can always get the generator object of an defined class with
> 'getRefClass()'. So:
> 
> 
> 
> g <- getRefClass("Blabla")
> 
> x <- g$new(.)
> 
> 
> 
> Regards,
> 
> Janko
> 
> 
> 
> 
> 
> Von: Janko Thyson [mailto:janko.thyson at ku-eichstaett.de] 
> Gesendet: Dienstag, 16. November 2010 00:27
> An: 'r-devel at r-project. org'
> Betreff: R5 reference classes: how to initialize exactly?
> 
> 
> 
> Dear List,
> 
> 
> 
> So far, I really like those new R5 classes. But what kind of puzzles me is
> that it's not just enough to define the actual reference class, I also have
> to assign it to an object (e.g. 'MyRefObj') in order to fire
> 'MyRefObj$new(.)'.
> 
> 
> 
> S4:
> 
> setClass("Blabla", .)
> 
> x <- new("Blabla")
> 
> 
> 
> R5:
> 
> MyRefObj <- setRefClass("Blabla", .)
> 
> x <- MyRefObj$new(.)
> 
> 
> 
> But then how do I define a reference class in a package that should be
> available after the package is loaded via 'library(my_pkg)' as there is no
> 'MyRefObj' at startup yet? Do I have to call the script where the definition
> lives?
> 
> 
> 
> Thanks for any comments,
> 
> Janko
> 
> 
> 
> 
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