| 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)