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Example 11.3 Composing Date Class with Person Class #include "String. h" #include "Date.h" class Person { public: void setDOB(int m, int d, int y) { dob.setDate(m, d, y);} void setDOD(int m, int d, int y) { dod.setDate(m, d, y);} // other methods as in in Ex. 11.1 private: Date dob, dod; // dates of birth & death }; satchmo.setDOB (7, 4, 1900); satchmo.setDOD (8, 15, 1971); satchmo.printName ( ); cout <<"\nBorn on "; satchmo.printDOB ( ); cout <<"\nDied on "; satchmo.printDOD ( ); cout <<".\n";
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Louis Armstrong Born on July 4, 1900
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Notice again that we have used a method of one class to define methods of the composed class: the setDate() function is used to define the setDOB() function. Composition is one way of reusing software to create new software. Inheritance Another way to reuse software is by means of inheritance (also called specialization or derivation). The common syntax for deriving a class Y from a class X is class Y : public X { // . . . }; Here X is called the base class (or superclass) and y is called the derived class (or subclass). The keyword public after the colon specifies
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public inheritance, which means that public members of the base class become public members of the derived class. Example 11.4 Deriving a Student: Class from the Person Class Since students are people it is natural to use the Person class to derive a Student class: #include "Person.h" class Student : public Person { public: Student(char* n, int s=0, char* i=""): Person(n, s), id(i), credits(0) { } void setDOE(int m, int d, int y) { dom. setDate(m, d, y);} void printDOE ( ) { cout <<dom;} private: String id; // student identification number Date doe; // date entered college int credits; // course credits float gpa; // grade-point average }; The Student class inherits all the public methods of the Person class, including its constructor. Student uses Person's to initialize the Person class name. Since this is a private member of the Person class it could not be accessed directly. Here is a test driver for the Student class: Student x("Ann Jones", "219360061"); x.setDOB(7, 10, 1983); x.setDOE(8, 26, 2001); x. printName ( ); cout << "\n Born: "; x.printDOB(); cout << "\nEntered: "; x.printDOE(); cout <<endl;
Beth Jones Born: Jul 10, 1983 Entered: Aug 26, 2001
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Remember! Inheritance is also call ''specialization'' or "derivation."
protected Class Members The Student class in Ex. 11.4 has a significant problem: it cannot directly access the private data members of its Person superclass: name, city, DOB, DOD, and sex. The lack of access of the first four of these are not serious because these can be written and read through the Person class' constructor and public access functions. However, there is no way to write or read a Student's sex. One way to overcome this problem would be to make sex a data member of the Student class. But that is unnatural: sex is an attribute that all Person objects have, not just Students. A better solution is to change the private access specifier to protected in the Person class. That will allow access to these data members from derived classes. Example 11.5 The Person Class with protected Data Members Change the private access specifier of Ex. 11.3 and 11.4 to protected and add the method printSex ( ) to the Student class: class Person { public: . . protected: String name, nationality; Date dob, dod; // dates of birth & death int sex; // 0 = female, 1 = male }; class Student : public Person { public: . . void printSex() { cout <<(sex "male":"female"); }
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