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.
Want to suggest features or report bugs for rdrr.io? Use the GitHub issue tracker.