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Program Repair Shop

39

_obs_get_parent_observers

• Suppose you have:

        my $g = Guard->new("Fred");
        my $an = Alarm::Noisy->new(...);  # derived class of Alarm
        Alarm->add_observer($g);          # $g observes all "Alarm" objects
        $an->notify_observers("I like pie!");  

• This notifies $g

• In general, if $g is watching some class, it also watches all its subclasses

• The logic for this is in _obs_get_parent_observers

• (What is "_obs" for?)

• When we ask for the observers of some object, we get not just the direct observers

• Also the observers of its class

• And any base classes of its class

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