There is a virtual class "refClass" that all reference classes subclass,
so is(x, "refClass") is the natural test, as in:
> foo <- setRefClass("foo", fields = "bar")
> x <- foo$new()
> is(x, "refClass")
[1] TRUE
On 3/10/11 7:40 AM, Jeffrey Horner wrote:
Hi all,
I've constructed the following function to test whether or not an
object was created from a reference class:
isRefClassObject<- function(x) isS4(x)&&
is.environment(attr(x,'.xData'))&&
exists('.refClassDef',attr(x,'.xData'))
but I'm unsure if it's a complete test or if there's a better way to
test. Regardless, It would be nice to have such a function in the
methods package.
I have a case where I'd like to ensure that an object is constructed
from a reference class AND that it implements a certain method:
if (isRefClassObject(x)&& 'run' %in% getRefClass(x)$methods())
x$run()
Thanks,
Jeff
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