Inheritance Basics in Software

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Inheritance Basics
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Display 144 Interface for the Derived Class SalariedEmployee
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 //This is the header file salariedemployeeh //This is the interface for the class SalariedEmployee #ifndef SALARIEDEMPLOYEE_H #define SALARIEDEMPLOYEE_H #include <string> #include "employeeh" using std::string; namespace SavitchEmployees { class SalariedEmployee : public Employee { public: SalariedEmployee( ); SalariedEmployee (string theName, string theSsn, double theWeeklySalary); double getSalary( ) const; void setSalary(double newSalary); void printCheck( ); private: double salary;//weekly }; }//SavitchEmployees #endif //SALARIEDEMPLOYEE_H
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The de nition of the class HourlyEmployee does not mention the member variables and netPay, but every object of the class HourlyEmployee has member variables named name, ssn, and netPay The member variables name, ssn, and netPay are inherited from the class Employee The class HourlyEmployee declares two additional member variables named wageRate, and hours Thus, every object of the class HourlyEmployee has ve member variables named name, ssn, netPay, wageRate, and hours Note that the de nition of a derived class (such as HourlyEmployee) only lists the added member variables The member variables de ned in the base class are not mentioned They are provided automatically to the derived class Just as it inherits the member variables of the class Employee, so too the class HourlyEmployee inherits all the member functions from the class Employee Thus, the class HourlyEmployee inherits the member functions getName, getSsn, getNetPay, setName, setSsn, setNetPay, and printCheck from the class Employee
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name, ssn,
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Inheritance
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INHERITED MEMBERS
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A derived class automatically has all the member variables and all the ordinary member functions of the base class (As discussed later in this chapter, there are some specialized member functions, such as constructors, that are not automatically inherited) These members from the base class are said to be inherited These inherited member functions and inherited member variables are, with one exception, not mentioned in the definition of the derived class, but they are automatically members of the derived class As explained in the text, you do mention an inherited member function in the definition of the derived class if you want to change the definition of the inherited member function
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In addition to the inherited member variables and member functions, a derived class can add new member variables and new member functions The new member variables and the declarations for the new member functions are listed in the class de nition For example, the derived class HourlyEmployee adds the two member variables wageRate and hours and adds the new member functions setRate, getRate, setHours, and getHours This is shown in Display 143 Note that you do not give the declarations of the inherited member functions unless you want to change the de nitions of the inherited member functions, which is a point that we will discuss shortly For now, do not worry about the details of the constructor de nition for the derived class We will discuss constructors in the next subsection In the implementation le for the derived class, such as the implementation of HourlyEmployee in Display 145, you give the de nitions of all the added member functions Note that you do not give de nitions for the inherited member functions unless the de nition of the member function is changed in the derived class, a point we discuss next
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PARENT
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When discussing derived classes, it is common to use terminology derived from family relationships A base class is often called a parent class A derived class is then called a child class This makes the language of inheritance very smooth For example, we can say that a child class inherits member variables and member functions from its parent class This analogy is often carried one step further A class that is a parent of a parent of a parent of another class (or some other number of parent of iterations) is often called an ancestor class If class A is an ancestor of class B, then class B is often called a descendant of class A
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