A function rather for internal use. It returns
TRUE if the
x has the R internal
OBJECT bit set, and
FALSE otherwise. The
OBJECT bit is set when a
"class" attribute is added and removed when that attribute is
removed, so this is a very efficient way to check if an object has a
class attribute. (S4 objects always should.)
object to be tested.
This is a primitive function.
is.object(1) # FALSE is.object(as.factor(1:3)) # TRUE
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