C++ Code Example: Calling Virtual Function from Constructor

Sphere: Related Content #include <string>
#include <iostream>
using namespace std;

class B {
   public:
      B(const string& ss) { cout << "B constructor\n"; f(ss); }
      virtual void f(const string&) { cout << "B::f\n";}
};

class D : public B {
   public:
      D(const string & ss) :B(ss) { cout << "D constructor\n";}
      void f(const string& ss) { cout << "D::f\n"; s = ss; }
   private:
      string s;
};

int main()
{
   D d("Hello");

   cout << "----------------" << endl;
   d.f("hi");
}