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The same thing happens with the destructors, except that each destructor executes its own code before calling its parent destructor. So all the parent destructors execute in bottom-up order.
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Here is a more realistic example: EXAMPLE 12.8 Parent Constructors and Destructors
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Here is a demo program that uses a base class Person and a derived class Student: class Person { public: Person(const char* s) { name = new char[strlen(s)+1]; strcpy(name, s); } ~Person() { delete [] name; } protected: char* name; };
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class Student : public Person { public: Student(const char* s, const char* m) : Person(s) { major = new char[strlen(m)+1]; strcpy(major, m); } ~Student() { delete [] major; } private: char* major; }; int main() { Person x("Bob"); { Student y("Sarah", "Biology"); } } When x is instantiated, it calls the Person constructor which allocates 4 bytes of memory to store the string Bob . Then y instantiates, first calling the Person constructor which allocates 6 bytes to store the string Sarah and then allocating 8 more bytes of memory to store the string Biology . The scope of y terminates before that of x because it is declared within an internal block. At that moment, y s destructor deallocates the 8 bytes used for Biology and then calls the Person destructor which deallocates the 6 bytes used for Sarah . Finally, the Person destructor is called to destroy x, deallocating the 4 bytes used for Bob .
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12.6 private ACCESS VERSUS protected ACCESS The difference between private and protected class members is that subclasses can access protected members of a parent class but not private members. Since protected is more flexible, when would you want to make members private The answer lies at the heart of the principle of information hiding: restrict access now to facilitate changes later. If you think you may want to modify the implementation of a data member in the future, then declaring it private will obviate the need to make any corollary changes in subclasses. Subclasses are independent of private data members.
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EXAMPLE 12.9 The person Class with protected and private Data Members
Suppose that we need to know whether people (i.e., Person objects) are high school graduates. We could just add a protected data member like sex that stores either 0 or 1. But we might decide later to replace it with data member(s) that contain more detailed information about the person s education. So, for now, we set up a private data member hs to prevent derived classes from accessing it directly: class Person { public: Person(char* n="", int s=0, char* nat="U.S.A.") : name(n), sex(s), nationality(nat) { } // ... protected: string name, nationality; Date dob, dod; // date of birth, date of death int sex; // 0 = female, 1 = male void setHSgraduate(int g) { hs = g; } int isHSgraduate() { return hs; } private: int hs; // = 1 if high school graduate }; We include protected access functions to allow subclasses to access the information. If we do later replace the hs data member with something else, we need only modify the implementations of these two access functions without affecting any subclasses.
12.7 virtual FUNCTIONS AND POLYMORPHISM One of the most powerful features of C++ is that it allows objects of different types to respond differently to the same function call. This is called polymorphism and it is achieved by means of virtual functions. Polymorphism is rendered possible by the fact that a pointer to a base class instance may also point to any subclass instance:
class X { // ... } class Y : public X { // ... } // Y is a subclass if X
int main() { X* p; // p is a pointer to objects of base class X Y y; p = &y; // p can also point to objects of subclass Y } So if p has type X* ( pointer to type X ), then p can also point to any object whose type is a subclass of X. However, even when p is pointing to an instance of a subclass Y, its type is still X*. So an expression like p->f() would invoke the function f() defined in the base class. Recall that p->f() is an alternate notation for (*p).f(). This invokes the member function f() of the object to which p points. But what if p is actually pointing to an object y of a subclass of the class to which p points, and what if that subclass Y has its own overriding version of f() Which
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