is.ref {ref}R Documentation

checking (for) references

Description

is.ref checks whether an object inherits from class "ref".
exists.ref checks whether an referenced object exists.

Usage

  is.ref(x)
  exists.ref(ref)

Arguments

x an object that might be a reference
ref a reference as returned from ref or as.ref

Value

logical scalar

Author(s)

Jens Oehlschlägel

See Also

ref, exists, inherits, class

Examples

  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)

[Package ref version 0.95 Index]