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As the thread here on PM and the two CPAN modules (written by notable Perl people) suggests, this is not as easy as it looks. I think the best way to get it right each time is to find an approach that always acts as "expected", and then put it in a module. I trust a module to be more consistent than me when faced with a repeated problem. :-)

Regarding your suggestions; it fails to behave like I would expect when it is inherited (and upon object destruction, but to be fair you do not have a constructor).

{ package Foo; sub can { my $self = shift; my $method = shift; return sub { print __PACKAGE__ . ": autoloaded $method\n" }; } sub AUTOLOAD { my $code = $_[0]->can(our($AUTOLOAD) =~ /.*::(.*)/s); goto &$code; } } { package Bar; our @ISA = Foo::; sub new { bless {} => shift } sub bar { print __PACKAGE__ . ": bar\n" } } my $o = Bar::->new; my $m = $o->can('bar'); $o->$m; $o->bar; __END__ Foo: autoloaded bar Bar: bar Foo: autoloaded DESTROY
In my solution outlined in the root node I handle it by moving the logic that generates the autoloaded subroutine reference to a common routine that both AUTOLOAD and can use. Then I see if UNIVERSAL::can returns anything. If it does it means that AUTOLOAD will not be invoked for $o->bar, so the return value of UNIVERSAL::can should be used instead. (This of course assumes that UNIVERSAL::can is not overloaded to do something else.)

The remaining logic in the root node is to handle when you use AUTOLOAD in a child class and the parent class also uses AUTOLOAD. This is even rarer, but it is still possible. As you say, it is important to trust a module to handle all edge cases so that you don't end up spending your evening debugging due to the module.


In reply to Re^4: A working strategy to handle AUTOLOAD, can(), and (multiple) inheritance without touching UNIVERSAL? by lodin
in thread A working strategy to handle AUTOLOAD, can(), and (multiple) inheritance without touching UNIVERSAL? by lodin

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