virt.cxx

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#include <iostream>
 
class base {
 
public:
 base() {}
 
 virtual void id() { std::cout << "hi i am base\n"; }
};
 
class derived : public base {
 
public:
 derived() { id(); }
 
 void id() override { std::cout << "hi i am derived\n"; }
};
 
int main() {
 std::cout << "base:\n";
 base b;
 
 std::cout << "\nderived:\n";
 derived d;
}