Your solution should work. Its biggest drawback is that every object created clears Perl's cache of method lookups. Also it leaks memory - create a thousand objects and Perl now has a thousand classes that never go away.

Memoizing would solve both of those problems. Matching sub refs isn't that hard. The following code will turn your hash into a string suitable for memoizing. 

use Scalar::Util qw(refaddr);

sub overload_string_specification {
    my $overload = shift;

     join " ",
        map { ($_=>refaddr($overload->{$_})) }
        sort keys %$overload;
}

[download]
Another solution is to overload all of the methods you may wish to be able to overload with methods that dynamically figure out the right function to call. If you only have a small number of methods that you'll be overloading this isn't a bad route. But if you could potentially wind up overloading all of the possible things in overload, then doing this basically means re-creating all of the dispatch logic in overload in your code. Which you may not want to do.

In reply to Re: Overloading different instances differently. by tilly
in thread Overloading different instances differently. by kyle

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