- ref EXPR
-
- ref
-
Returns a true value if EXPR is a reference, false otherwise. If EXPR is not specified,
$_ will be used. The value returned depends on the type of thing the
reference is a reference to. Builtin types include:
SCALAR
ARRAY
HASH
CODE
REF
GLOB
LVALUE
|
|
If the referenced object has been blessed into a package, then that package name is
returned instead. You can think of ref as a typeof operator.
if (ref($r) eq "HASH") {
print "r is a reference to a hash.\n";
}
unless (ref($r)) {
print "r is not a reference at all.\n";
}
if (UNIVERSAL::isa($r, "HASH")) { # for subclassing
print "r is a reference to something that isa hash.\n";
}
|
|
See also perlref.
|
|
