The following code example is taken from the book
C++ Templates - The Complete Guide
by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002
© Copyright David Vandevoorde and Nicolai M. Josuttis 2002
#include <iostream>
class Empty {
typedef int Int; // typedef members don't make a class nonempty
};
class EmptyToo : public Empty {
};
class NonEmpty : public Empty, public EmptyToo {
};
int main()
{
std::cout << "sizeof(Empty): " << sizeof(Empty) << '\n';
std::cout << "sizeof(EmptyToo): " << sizeof(EmptyToo) << '\n';
std::cout << "sizeof(NonEmpty): " << sizeof(NonEmpty) << '\n';
}