[R] Use of contains in S4 classes

[Paul Roebuck]

On Thu, 18 Aug 2005, Ross Boylan wrote:

> setClass("B", representation=representation("B", extra="numeric))
> setClass("B", representation=representation(extra="numeric"),
> 	contains="B")
> Are these the same?  If not, how do they differ?
>
> What about
> setClass("B", representation=representation("B", extra="numeric"),
> 	contains="B")
> ?
>
> As far as I can tell, the Green Book doesn't talk about a contains
> argument to setClass.

"S4 - Composition and Inheritance" by Witold Eryk Wolski
(a.k.a. Extending.pdf) might be what you're looking for.

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