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To define a function as abstract in C++ ( with the = 0; ) the function must be declared virtual as well to provide the ability to override the function in the child class. I can't find the line in the spec but, try it in VS and you will:
- maktech07 November 27, 2012error C2253: 'Abstract::AbstractFunc' : pure specifier or abstract override specifier only allowed on virtual function
An abstract class has two features, cannot be created without being sub-classed and forces the child class to override a function.
My original suggestion above provided the first. Since the question does not want us to use virtual, then the second feature is not possible.