Reference Classes: shortcut like 'isS4' for Ref Classes?

As it says on the help page ?ReferenceClasses:

All reference classes inherit from the class "envRefClass"

So,
  is(x, "envRefClass")

And, less well documented but less typing:

  is(x, "refClass")
also works.

On 6/6/11 9:48 AM, Janko Thyson wrote:

Dear list,

is there a shortcut-function to check whether a class is a Reference
Class or not? There's something like this for S4 classes
('isS4(object)'), but I couldn't find anything regarding Ref Classes.

Currently, I'm doing it this way, which is a bit clumsy:

A <- setRefClass("A", fields=list(X="numeric"))
a <- A$new()

isRefClass <- function(object, ...){
return(getClass(class(object))@class == "refClassRepresentation")
# getRefClass(class(object))@class == "refObjectGenerator"
}

isRefClass(a)
[1] TRUE

Regards,
Janko