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Program Repair Shop

28

Object member data

• This raises several new potential problems

• What should the name of the hash key be?

• The name of the hash key should be Class::Observable::something

• Say, Class::Observable::_observers

• We will provide an escape hatch in case this choice ever poses a problem

• The name will not be hardcoded in our module

• Instead of:

        push @{$self->{Class::Observable::_observers}}, ...;

• We will always have:

        push @{$self->{$self->key}}, ...;

        sub key { "Class::Observable::_observers" }

• Now if the key choice is bad for someone, they can change it

• Just subclass Class::Observable and override key

• It only takes a moment

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