is.ref {ref} | R Documentation |
is.ref
checks whether an object inherits from class "ref".
exists.ref
checks whether an referenced object exists.
is.ref(x) exists.ref(ref)
x |
an object that might be a reference |
ref |
a reference as returned from ref or as.ref |
logical scalar
Jens Oehlschlägel
v <- 1 good.r <- as.ref(v) bad.r <- ref("NonExistingObject") is.ref(v) is.ref(good.r) is.ref(bad.r) exists.ref(good.r) exists.ref(bad.r)