Answer the following statements true (T) or false (F)

Question

1. In C++, a virtual destructor is invoked whenever a virtual constructor was used to create the object.
2. Redefining and overriding are exactly the same thing.
3. A class template can be derived from a non-template class.
4. A class template cannot be derived from a class template.
5. A non-template class can be derived from a class template instantiation.

Answer 1

1. False
The keyword virtual cannot be applied to a constructor. There is a virtual constructor idiom. (see p291, Cline, Lomow, and Girou, C++ FAQs, AWL ISBN 0-201-30983-1) There are very necessary virtual destructors.
>>Same story. Not in text. Have to cut
2. False
If you put virtual in the base class for a function name whose signature is the same down the inheritance chain, then you are overriding. If you leave off the virtual keyword here you are redefining. A difference arises only when you access the member function through a pointer or a reference to a base class and the object referred to is of a derived class type. Otherwise, the behavior is the same.
3. True
4. False
The example provided in the text in Display 16.8 is an example that the statement is false.
5. True
This is ordinary inheritance.