Promoting to a Subclass

[James Edward Gray II]

If I have an object and I want to increase it's functionality by 
"upgrading/promoting" it to a subclass if certain conditions are met 
during a method call, could/should I use something like:

sub some_method {
        my $self = $_[0];

        # ...

        if (PROMOTE_CONDITION) {
                $_[0] = Subclass->copy_constructor($self);
        }
}

That will change the reference in the calling code, right?  Any reason 
I shouldn't do this?

James


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