C++ Classes C++ Interlude 1.

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Presentation transcript:

C++ Classes C++ Interlude 1

A Problem to Solve Consider a video game where a character carries three types of boxes Plain box Toy box Magic box Plain box design Get and Set public methods

A Problem to Solve LISTING C1-1 The header file for the class PlainBox

A Problem to Solve LISTING C1-1 The header file for the class PlainBox

A Problem to Solve Elements of the class Private data fields Constructors, destructors Methods Use of #ifndef , #define , and #endif preprocessor directives Use of initializers Use of typedef Inheritance

A Problem to Solve LISTING C1-2 Implementation file for the PlainBox class

A Problem to Solve LISTING C1-3 Template header file for the PlainBox class

A Problem to Solve LISTING C1-3 Template header file for the PlainBox class

A Problem to Solve LISTING C1-4 Implementation file for the PlainBox template class

A Problem to Solve LISTING C1-4 Implementation file for the PlainBox template class

Base Classes and Derived Classes Use PlainBox as a base class , or superclass The ToyBox class is the derived class , or subclass , of the PlainBox Derived class inherits All the members of its base class, (Except the constructors and destructor)

Base Classes and Derived Classes LISTING C1-5 Template header file for the class ToyBox

Base Classes and Derived Classes LISTING C1-6 Implementation file for the class ToyBox

Overriding Base-Class Methods You can add as many new members to derived class as desired You can redefine inherited methods Called overriding a base-class method. A method overrides a base-class method when The two methods have the same name and parameter declarations

Overriding Base-Class Methods LISTING C1-7 Header file for the class MagicBox

Overriding Base-Class Methods LISTING C1-8 Implementation file for the class MagicBox

Virtual Methods, Abstract Classes Using keyword virtual in front of the prototype Tells the C++ compiler that the code this method executes is determined at runtime Pure virtual method Virtual method that has no implementation Abstract class Has at least one pure virtual method

Virtual Methods, Abstract Classes LISTING C1-9 An abstract class that is an interface for the ADT box

End Interlude 1