and the left side must be either an object (a blessed reference)
or a class name (that is, a package name). See L<perlobj>.
+The dereferencing cases (as opposed to method-calling cases) are
+somewhat extended by the experimental C<postderef> feature. For the
+details of that feature, consult L<perlref/Postfix Dereference Syntax>.
+
=head2 Auto-increment and Auto-decrement
X<increment> X<auto-increment> X<++> X<decrement> X<auto-decrement> X<-->
The standard Tie::RefHash module provides a convenient workaround to this.
+=head1 Postfix Dereference Syntax
+
+Beginning in v5.20.0, a postfix syntax for using references is
+available. It behaves as described in L</Using References>, but instead
+of a prefixed sigil, a postfixed sigil-and-star is used.
+
+For example:
+
+ $r = \@a;
+ @b = $r->@*; # equivalent to @$r or @{ $r }
+
+ $r = [ 1, [ 2, 3 ], 4 ];
+ $r->[1]->@*; # equivalent to @{ $r->[1] }
+
+This syntax must be enabled with C<use feature 'postderef'>. It is
+experimental, and will warn by default unless C<no warnings
+'experimental::postderef'> is in effect.
+
+Postfix dereference should work in all circumstances where block
+(circumfix) dereference worked, and should be entirely equivalent. This
+syntax allows dereferencing to be written and read entirely
+left-to-right. The following equivalencies are defined:
+
+ $sref->$*; # same as ${ $sref }
+ $aref->@*; # same as @{ $aref }
+ $href->%*; # same as %{ $href }
+ $cref->&*; # same as &{ $cref }
+
+Note especially that C<< $cref->&* >> is I<not> equivalent to C<<
+$cref->() >>, and can serve different purposes. C<< $gref->** >> is not
+(yet?) implemented.
+
+Postfix array and scalar dereferencing I<can> be used in interpolating
+strings (double quotes or the C<qq> operator), but only if the
+additional C<postderef_qq> feature is enabled.
+
+=head2 Postfix Reference Slicing
+
+Value slices of arrays and hashes may also be taken with postfix
+dereferencing notation, with the following equivalencies:
+
+ $aref->@[ ... ]; # same as @$aref[ ... ]
+ $href->@{ ... }; # same as @$href{ ... }
+
+Postfix key/value pair slicing is not I<yet> implemented, but will
+behave as expected:
+
+ $aref->%[ ... ]; # same as %$aref[ ... ]
+ $href->%{ ... }; # same as %$href{ ... }
+
+As with postfix array, postfix value slice dereferencing I<can> be used
+in interpolating strings (double quotes or the C<qq> operator), but only
+if the additional C<postderef_qq> feature is enabled.
+
=head1 SEE ALSO
Besides the obvious documents, source code can be instructive.