?? virtual.cpp
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/* The following code example is taken from the book * "C++ Templates - The Complete Guide" * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002 * * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#include <iostream>class NotVirtual {};class Virtual { public: virtual void foo() { }};template <typename VBase>class Base : private VBase { public: // the virtuality of foo() depends on its declaration // (if any) in the base class VBase void foo() { std::cout << "Base::foo()" << '\n'; }};template <typename V>class Derived : public Base<V> { public: void foo() { std::cout << "Derived::foo()" << '\n'; }};int main(){ Base<NotVirtual>* p1 = new Derived<NotVirtual>; p1->foo(); // calls Base::foo() Base<Virtual>* p2 = new Derived<Virtual>; p2->foo(); // calls Derived::foo()}
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