ref - find out the type of thing being referenced |
ref - find out the type of thing being referenced
ref EXPR
ref
Returns a non-empty string if EXPR is a reference, the empty
string 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"; }
See also the perlref manpage.
ref - find out the type of thing being referenced |