Interview Question: Virtual Enhancement

Sample Question #129 (programming – C++)

What’s the difference between virtual and nonvirtual base classes?

[Source: exercise 14.6 in Prata, C++ Primer Plus, 5th edition]

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One Response to Interview Question: Virtual Enhancement

  1. Brett says:

    ANSWER
     
    If two lines of inheritance for a class share a common nonvirtual ancestor, the class winds up having two copies of the ancestor’s members. Making the ancestor class a virtual base class solves this redundancy problem.
     
    [Adapted from Prata’s answer] 

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