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Unfortunately, this doesn't work in vanilla Perl:

#!/usr/bin/perl use strict; use warnings; sub Foo::method { return "Foo" } BEGIN { @Bar::ISA = qw( Foo ); } sub Bar::method { goto $_[ 0 ]->SUPER::can( 'method' ); } print Bar->method(), "\n";

This is an infinite loop, because it dispatches to UNIVERSAL::can with $_[ 0 ] as the first parameter. This means that adorning the call with SUPER:: doesn't make a difference here. And since the package for $_[ 0 ] is Bar, can() finds Bar::method, so round and round we go…

But we can easily make this work. I came up with this before reading steves' reply, but it is just a cleaner, more polished version of that trick. Stick this somewhere in the code:

sub SUPER::can { my $caller = ( caller 1 )[ 3 ]; no strict 'refs'; local *$caller; return UNIVERSAL::can( @_ ); }

Tiny as it is, maybe this ought to be on CPAN?

See replies.

Makeshifts last the longest.

In reply to Re: goto superclass method by Aristotle
in thread goto superclass method by avarus

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