On Wed, Jun 4, 2008 at 8:05 PM, Michael Lawrence <[EMAIL PROTECTED]> wrote:
> The is() function begins with the following code:
>
> cl <- class(object)
> if (length(cl) > 1) {
> if (is.na(match(cl[[1]], names(getClass("oldClass")@subclasses))))
>
> return(class2 %in% cl)
>
> As one can see, it uses S3 inheritance if the first element of the class
> attribute is an "oldClass". In R prior to 2.7, is() would check S4
> inheritance if any (not just the first) classes named in the class attribute
> were derived from "oldClass".
>
Sorry just checked and this is how it basically behaved pre R 2.7, so I
guess I withdraw my request ;)
> It seems to me that S3 inheritance would imply that an R object is an
> instance of "oldClass" if any of its classes are derived from "oldClass".
> Could the current behavior be changed, please?
>
> Thanks,
> Michael
>
[[alternative HTML version deleted]]
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
