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Composition and friend Functions

Explore the concepts of composition and friend functions in computer science, including how objects of classes can be data members of other classes and the access of private data members by friend functions. Follow examples to create classes and understand the implementation of friend functions.

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Composition and friend Functions

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  1. Composition and friend Functions CS250 Introduction to Computer Science II

  2. Composition • All the data members we have seen so far have been simple variables (int, double, etc) • It is possible to have objects of classes as data members of other classes • This is called composition CS250 Introduction to Computer Science II

  3. Example • Create a class Employee that will contain the employee name and the time the employee starts work and the time the employee finishes work • The time should be represented as objects of class Time CS250 Introduction to Computer Science II

  4. Friend Functions • Only the member functions of a class have direct access to the private data members of the class • friend functions are friends of the class that are defined outside of the class but still have access to private data members CS250 Introduction to Computer Science II

  5. friend Functions • The function prototype is placed in the class, preceded by the keyword friend • The function definition can be written anywhere without the class name (class::) • The function is able to directly access the private data members CS250 Introduction to Computer Science II

  6. Summary • Today we covered • Composition • Friend Functions • Completed pages 478 - 489 CS250 Introduction to Computer Science II

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