Inheritance: Derivation Lists

derivation list (a list of parent classes)
protected data members and member functions

Derivation List
• It follows the class name
• Consists of a ":" followed by a comma separated list of base classes
• The public qualifier on a base class indicates public derivation:
  
  • This form of derivation is used most frequently.
  Public derivation implies that public members of the base class will be inherited as public members of the derived class.
  • The protected access specifier used with members of a class specifies that these members may only be accessed by member functions of the class or member functions of its derived class. Example...
  • protected members of the base class are inherited as protected members of the derived class.
  • Private members of the base class, although contained in the derived class, are private to the base class, and therefore, cannot be accessed by member functions of the derived class. They can only be accessed by member functions of the base class.

  
  class DerivedClassName : public BaseClassOne, public BaseClassTwo{
  public:
  	// Public members go here
  protected:
  	// Protected members go here
  private:
  	// Private members go here
  };
  

  • Sample Programs ...
• The protected qualifier on a base class indicates protected derivation:
• Protected derivation implies that public members of the base class will be inherited as protected members of the derived class, and protected members of the base class will be inherited as protected members of the derived class.
• Private members of the base class, although contained in the derived class, are private to the base class, and therefore, cannot be accessed by member functions of the derived class. They can only be accessed by member functions of the base class.
• The private qualifier on a base class indicates private derivation:
• The default form of derivation is private derivation.
Private derivation implies that public and protected members of the base class will be inherited as private members of the derived class.
• Private members of the base class, although contained in the derived class, are private to the base class, and therefore, cannot be accessed by member functions of the derived class. They can only be accessed by member functions of the base class.
• Sample Programs ...
• Summary of Inheritance Types and Access Levels