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I need to understand these statements:
virtual string FOOy() = 0;
virtual string FOOx( bool FOOBAR ) = 0;
I am not sure if the function being virtual has anything to do with it…
Although your testcase is woefully incomplete, from the presence of the keyword
virtualit looks like this is inside a class definition.In such a context,
= 0is not an assignment at all, but a piece of confusing syntax that marks the virtual member function as being “pure”. A pure virtual member function may have an implementation (defined elsewhere), but one is optional and the function’s very existence prohibits the class from being instantiated.That is, a class with pure virtual member functions may be called “abstract”.
Your peer-reviewed C++ book covers the topic in much greater detail.