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Runtime Polymorphism · 4:04
override and final
A derived function that looks like an override, compiles cleanly, and never gets called. We go through the six things that must line up for a function to override, watch the keyword override turn four silent near-misses into compile errors, use final to close a class or a function to further overriding, and see what & and && after a member function mean, with a Widget that moves its data out of temporaries.
You will learn
- List the requirements for a derived function to override a base virtual function
- Use override so the compiler catches near-miss overrides
- Use final on classes and virtual functions
- Explain reference qualifiers and use them to move data out of temporaries