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Chapter 11 Class Inheritance

Chapter 11 Class Inheritance. Chapter 11. Inheritance is that property of object-oriented programming that allows one class, called a derived class , to share the structure and behavior of another class, called a base class. Chapter 11. A family of bank account classes. Chapter 11.

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Chapter 11 Class Inheritance

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  1. Chapter 11Class Inheritance

  2. Chapter 11 • Inheritance is that property of object-oriented programming that allows one class, called a derived class, to share the structure and behavior of another class, called a base class.

  3. Chapter 11 • A family of bank account classes

  4. Chapter 11 • The important link between a derived class and its base class is the IS-A link. For instance, a checking account IS-A bank account. The IS-A relationship must exist if inheritance is used properly. If there is no IS-A relationship, inheritance should not be used.

  5. Chapter 11 Format for Declaring Derived Classes classderived class : public base class { Derived Class Member Functions Derived Class Member Data }; //END CLASS

  6. Chapter 11 • A protected member of a class is a member that is accessible to both the base class and any derived classes of the base class in which it is declared. Use the keyword protected when declaring a member of a class if you want to allow access to the member by a derived class. The # symbol is used in UML to denote a protected class member.

  7. Chapter 11 • An abstract class is a base class for which objects will never be created.

  8. Chapter 11 • A public base class allows all public members of the base class to be public in the derived class.

  9. Chapter 11 • Single inheritance occurs when the inherited class members can be traced back to a single parent class. • Multiple inheritance occurs when the inherited class members can be traced back to more than one parent class.

  10. Chapter 11 Use #ifndef When Declaring Base Classes in C++, as follows: #ifndefHEADER FILE NAME_H #define HEADER FILE NAME _H BASE CLASS DECLARATION #endif

  11. Chapter 11 • The term polymorphic is Greek meaning “of many forms.” • A polymorphicfunction is one that has the same name for different classes of the same family, but has different implementations, or behavior, for the various classes.

  12. Chapter 11 • Dynamic, or late, binding occurs when a polymorphic function is defined for several classes in a family but the actual code for the function is not attached, or bound, until execution time. • A polymorphic function that is dynamically bound is called a virtual function.

  13. Chapter 11 • Staticbinding occurs when a polymorphic function is defined for several classes in a family and the actual code for the function is attached, or bound, at compile time. Overloaded functions are statically bound.

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