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#include "Date.h" class Person { public: Person(char* n="", int s=0, char* nat="U.S.A.") : name(n), sex(s), nationality(nat) { } 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); } void printName() { cout << name; } void printNationality() { cout << nationality; } void printDOB() { cout << dob; } void printDOD() { cout << dod; } protected: string name, nationality; Date dob, dod; // date of birth, date of death int sex; // 0 = female, 1 = male }; class Student : public Person { public: Student(char* n, int s=0, char* i="") : Person(n, s), id(i), credits(0) { } void setDOM(int m, int d, int y) { dom.setDate(m, d, y); } void printDOM() { cout << dom; } void printSex() { cout << (sex "male" : "female"); } protected: string id; // student identification number Date dom; // date of matriculation int credits; // course credits float gpa; // grade-point average }; Now all five data members defined in the Person class are accessible from its Student subclass, as seen by the following test driver: int main() { Student x("Ann Jones", 0, "219360061"); x.setDOB(5, 13, 1977); x.setDOM(8, 29, 1995); x.setDOD(7,4,1826); x.printName(); cout << "\n\t Born: "; x.printDOB(); cout << "\n\t Sex: "; x.printSex(); cout << "\n\tMatriculated: "; x.printDOM(); cout << endl; } Ann Jones Born: May 13, 1977 Sex: female Matriculated: August 29, 1995
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The protected access category is a balance between private and public categories: private members are accessible only from within the class itself and its friend classes;
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protected members are accessible from within the class itself, its friend classes, its derived classes, and their friend classes; public members are accessible from anywhere within the file. In general, protected is used instead of private whenever it is anticipated that a sub-
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class might be defined for the class. A subclass inherits all the public and protected members of its base class. This means that, from the point of view of the subclass, the public and protected members of its base class appear as though they actually were declared in the subclass. For example, suppose that class X and subclass Y are defined as
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class X { public: int a; protected: int b; private: int c; }; class Y : public X { public: int d; }; and x and y are declared by X x; Y y;
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Then we can visualize objects x and y as shown below.
x a b c
a b c
The public member a of class X is inherited as a public member of y, and the protected member b of class X is inherited as a protected member of y. But the private member c of class X is not inherited by y. (The horizontal lines in each object indicate the separate public, protected, and private regions of the object.) 12.5 OVERRIDING AND DOMINATING INHERITED MEMBERS If Y is a subclass of X, then Y objects inherit all the public and protected member data and member functions of X. For example, the name data and printName() function in the Person class are also members of the Student class. In some cases, you might want to define a local version of an inherited member. For example, if a is a data member of X and if Y is a subclass of X, then you could also define a separate data member named a for Y. In this case, we say that the a defined in Y dominates the a defined in X. Then a reference y.a for an object y of class Y will access the a defined in Y instead of the a defined in X. To access the a defined in X, one would use y.X::a.
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