C++ Tutorial/Class/virtual inheritance

Using virtual base classes

<source lang="cpp">#include <iostream> using std::cout; using std::endl; class Base { public:

  virtual void print() const = 0; // pure virtual

}; class Derived1 : virtual public Base { public:

  void print() const
  {
     cout << "Derived1\n";
  }

}; class Derived2 : virtual public Base { public:

  void print() const
  {
     cout << "Derived2\n";
  }

}; class Multiple : public Derived1, public Derived2 { public:

  void print() const
  {
     Derived2::print();
  }

}; int main() {

  Multiple both;
  Derived1 one;
  Derived2 two;
  Base *array[ 3 ];
  array[ 0 ] = &both;
  array[ 1 ] = &one;
  array[ 2 ] = &two;
  for ( int i = 0; i < 3; i++ )
     array[ i ]->print();
  return 0;

}</source>

Derived2
Derived1
Derived2