COMP: Add more C++11 override instrumentation
Providing override key work allows for extra checking that the function signatures are correct. https://stackoverflow.com/questions/39932391/virtual-override-or-both-c?answertab=active#tab-top In the derived class the function is virtual by way of having the ¹same type as the base class function. However, an override can help avoid bugs by producing a compilation error when the intended override isn't technically an override. E.g. that the function type isn't exactly like the base class function. Or that a maintenance of the base class changes that function's type, e.g. adding a defaulted argument. In the same way, a virtual keyword in the derived class can make such a bug more subtle, by ensuring that the function is still virtual in further derived classes. The general advice is, -Use virtual for the base class function declaration. This is technically necessary. -Use override (only) for a derived class' override. This helps maintenance.
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