tYSR20

Table of ContentsxiDeclaring Static Member Functions...........................................................255What Is This About, Anyway?.....................................................................258Part IV: Inheritance...................................................259Chapter 20: Inheriting a Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .261Do I Need My Inheritance? ..........................................................................262How Does a Class Inherit?...........................................................................263Using a subclass .................................................................................265Constructing a subclass ....................................................................265Destructing a subclass.......................................................................267Having a HAS_A Relationship .....................................................................267Chapter 21: Examining Virtual Member Functions: Are They for Real? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .269Why You Need Polymorphism....................................................................272How Polymorphism Works .........................................................................274When Is a Virtual Function Not?.................................................................276Considering Virtual Considerations ..........................................................277Chapter 22: Factoring Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .279Factoring .......................................................................................................279Implementing Abstract Classes..................................................................284Describing the abstract class concept ............................................286Making an honest class out of an abstract class............................287Passing abstract classes....................................................................289Declaring pure virtual functions — is it really necessary? ...........290Factoring C++ Source Code .........................................................................291Dividing the program — Student......................................................292Defining a namespace ........................................................................293Implementing Student........................................................................294Dividing the program — GraduateStudent .....................................295Implementing an application ............................................................296Project file ...........................................................................................298Creating a project file under Dev-C++ ..............................................298Part V: Optional Features...........................................303Chapter 23: A New Assignment Operator, Should You Decide to Accept It . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .305Comparing Operators with Functions .......................................................305Inserting a New Operator............................................................................306