ref
ref - find out the type of thing being referenced
ref EXPR
Returns a TRUE value if EXPR is a reference, FALSE otherwise. The value
returned depends on the type of thing the reference is a reference to.
Builtin types include:
REF
SCALAR
ARRAY
HASH
CODE
GLOB
If the referenced object has been blessed into a package, then that package
name is returned instead. You can think of
ref()
as a typeof() operator.
if (ref($r) eq "HASH") {
print "r is a reference to an associative array.\n";
}
if (!ref ($r) {
print "r is not a reference at all.\n";
}
See also
the perlref manpage
.