© Will Briggs 2021
W. BriggsC++20 for Lazy Programmershttps://doi.org/10.1007/978-1-4842-6306-8_21

21. Virtual Functions and Multiple Inheritance

Will Briggs1  
Lynchburg, VA, USA

Virtual functions and multiple inheritance don’t show up in most classes I write – but when I need them, I need them.

Virtual functions, plus: move functions with movable parents and class members

Polymorphism is , essentially, using the same word to mean different things. We’ve been doing it all along. Consider the operator +. We use it for adding ints or doubles or strings. These are conceptually similar, but they’re done very differently by the machine.

Another example might be a function start, which could apply to a car, a plane, or a lawn mower. In each case, the ...

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