Is there a (virtual) class that all R objects inherit from?

On 31.05.2011 18:17, Martin Morgan wrote:

On 05/30/2011 07:02 AM, Janko Thyson wrote:

Dear list,

I would like to set one specific Reference Class field to be of an
arbitrary class. Is there a class that all R objects inherit from? I
thought that "ANY" was something like this, but obviously that's not
true:

inherits(1:3, "ANY")

[1] FALSE

I can't speak to the implementation, but ANY functions as a base class
in terms of slot / field assignment and inheritance, e.g.,

setClass("A", representation(x="ANY"))
new("A", x=1:3)

Martin

Hi Martin,

sorry for the late response. The way you do it works. Yet, when you
declare dependencies more explicitly (contains=XY), then R complains. Is
this a feature or a bug (with respect to the "less explicit" way working
just fine)? See the example below:

# S4
setClass("A", representation(x="ANY"))
new("A", x=1:3)

setClass("A", representation(x="ANY"))
setClass("B", contains="A", representation(x="character"))
new("B", x=1:3)

# Reference Classes
setRefClass(
Class="A",
fields=list(
.PRIMARYDATA="ANY"
),
contains=c("VIRTUAL")
)
B <- setRefClass(
Class="B",
fields=list(
.PRIMARYDATA="character"
),
contains=c("A")
)

Regards,
Janko

Regards,
Janko

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