This is exactly why you should have followed the advice given to you by lostjimmy in Re: Inherit only few methods from a parent class. If a child class is not a drop in replacement for its parent, then you should not be using inheritance, but use composition (also called delegation) instead.

See also Liskov substitution principle, Class::Delegation::Simple

In reply to Re^3: Inherit only few methods from a parent class by Arunbear
in thread Inherit only few methods from a parent class by Anonymous Monk

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