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";

[download]

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( @_ );
}

[download]

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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