[Rd] Testing for a reference class object

Jeffrey Horner jeffrey.horner at gmail.com
Thu Mar 10 16:40:04 CET 2011

Hi all,

I've constructed the following function to test whether or not an
object was created from a reference class:

isRefClassObject <- function(x) isS4(x) &&
is.environment(attr(x,'.xData')) &&

but I'm unsure if it's a complete test or if there's a better way to
test. Regardless, It would be nice to have such a function in the
methods package.

I have a case where I'd like to ensure that an object is constructed
from a reference class AND that it implements a certain method:

if (isRefClassObject(x) && 'run' %in% getRefClass(x)$methods())



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