#include <cstdlib> 
    #include <iostream> 
      
    struct A  { 
      virtual ~A() {} 
      virtual void foo() const { std::cout << "A::foo()" << std::endl; } 
      virtual void bar() const { std::cout << "A::bar()" << std::endl; } 
      void baz() const { std::cout << "A::baz()" << std::endl; } 
    }; 
      
    struct B : public A  { 
      virtual void foo() const { std::cout << "B::foo()" << std::endl; } 
      void bar() const { std::cout << "B::bar()" << std::endl; } 
      void baz() const { std::cout << "B::baz()" << std::endl; } 
    }; 
      
    int main() { 
      A * pA = new B; // 1 
      pA->foo(); 
      pA->bar(); 
      pA->baz(); 
      delete pA; 
      return 0; 
    }