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Program Repair Shop

54

delete_observer

• I have an idea of why it might not have been finished

• There are some interesting issues here

• The rest of the code suggests to me that the author is a subtle thinker

• Prone to worrying about issues like this:

        my $g = Guard->new("Fred");
        my $a = Alarm->new;
        $a->add_observer($g1);
        $a->add_observer($g1);
        $a->delete_observer($g1);
        $a->notify_observers("I like pie!"); 

• Does this notify $g1?

• I am not a subtle thinker

• I decided that the second add_observer is a no-op

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