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Although the system will provide them automatically, it is considered good programming practice always to define the copy constructor, the assignment operator, and the destructor within each class definition.
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Constant Objects It is good programming practice to make an object constant if it should not be changed. This is done with the const keyword: const char BLANK = ' '; const int MAX_INT = 2147483647; const double PI = 3.141592653589793; void init (float a(), const int SIZE); Like variables and function parameters, objects may also be declared to be constant: const Rational PI (22,7); When this is done, the C++ compiler restricts access to the object's methods. For example, with the Rational class defined previously, the print() function could not be called for this object: PI.print(), // error: call not allowed
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In fact, unless we modify our class definition, the only methods that could be called for const objects would be the constructors and the destructor. To overcome this restriction, we must declare as constant those methods that we want to be able to use with const objects. A function is declared constant by inserting the const keyword between its parameter list and its body: void print() const {cout <<num <<'/' <<den <<endl;} This modification of the function definition will allow it to be called for constant objects: const Rational PI(22,7); PI.print(); // o.k. now
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Structures The C++ class is a generalization of the C struct (for "structure") which is a class with only public members and no functions. One normally thinks of a class as a structure that is given life by means of its methods and which enjoys information hiding by means of private data members. To remain compatible with the older C language, C++ retains the struct keyword, which allows structs to be defined. However, a C++ struct is essentially the same as a C++ class. The only significant difference between the two is with the default access specifier assigned to members. Although not recommended, C++ classes can be defined without explicitly specifying its member access specifier. For example, class Rational { int num, den; } is a valid definition of a Rational class. Since the access specifier for its data members num and den is not specified, it is set by default to be private. If we make it a struct instead of a class struct Rational ( int num, den; } then the data members are set by default to be public. Pointers to Objects In many applications, it is advantageous to use pointers to objects (and structs). Here is a simple example: Example 8.7 Using Pointers to Objects class X { public: int data; }; void main( ) { X* p = new X; (*p) .data=22; // equivalent to: p->data=22; cout <<"(*p).data=" <<(*p) .data <<"=" <<p->data <<endl; p->data=44;
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cout <<" p->data=" <<(*p).data <<"=" <<p->data <<endl; }
(*p).data=22=22 p->data=44=44
Since p is a pointer to an x object, *p is an x object, and (*p). data accesses its (public) data member data. Parentheses are required in the expression (*p).data because the direct member selection operator "." has higher precedence than the dereferencing operator "*". The two notations: (*p).data and p->data have the same meaning. When working with pointers, the "arrow" symbol "->" is preferred as it is simpler and suggests "the thing to which p points." Example 8.8 A Node Class for Linked Lists This defines a Node class each of whose objects contain an int data member and a next pointer. The program allows the user to create a linked list. Then it traverses the list, printing each data value. class Node { public: Node(int d, Node* p=0) : data(d), next(p) { } int data; Node* next; }; void main() { int n; Node* p; Node* q=0; while (cin >>n) { p = new Node(n, q); q = P; } for (; p->next; p=p->next) cout <<p->data <<" -> "; cout <<"*\n"; }
77 66 55 44 33 22^D 22 -> 33 -> 44 -> 55 -> 66 -> 77 -> *
First note that the definition of the Node class includes two references to the class itself. This is allowed because each
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