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holds only a pointer to the actual string, so a bit-by-bit copy would only duplicate the pointer, not the string itself. In cases like this, it is essential that you define your own copy constructor. 10.8 THE CLASS DESTRUCTOR When an object is created, a constructor is called automatically to manage its birth. Similarly, when an object comes to the end of its life, another special member function is called automatically to manage its death. This function is called a destructor. Each class has exactly one destructor. If it is not defined explicitly in the class definition, then like the default constructor, the copy constructor, and the assignment operator, the destructor is created automatically. EXAMPLE 10.11 Including a Destructor in the Ratio Class
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class Ratio { public: Ratio() { cout << "OBJECT IS BORN.\n"; } ~Ratio() { cout << "OBJECT DIES.\n"; } private: int num, den; }; int main() { { Ratio x; // beginning of scope for x cout << "Now x is alive.\n"; } // end of scope for x cout << "Now between blocks.\n"; { Ratio y; cout << "Now y is alive.\n"; } } OBJECT IS BORN. Now x is alive. OBJECT DIES. Now between blocks. OBJECT IS BORN. Now y is alive. OBJECT DIES.
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The output here shows when the constructor and the destructor are called.
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The class destructor is called for an object when it reaches the end of its scope. For a local object, this will be at the end of the block within which it is declared. For a static object, it will be at the end of the main() function. 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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10.9 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:
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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 Ratio PI(22,7);
However, when this is done, the C++ compiler restricts access to the object s member functions. For example, with the Ratio class defined previously, the print() function could not be called for this object:
PI.print(); // error: call not allowed
In fact, unless we modify our class definition, the only member functions that could be called for const objects would be the constructors and the destructor. To overcome this restriction, we must declare as constant those member functions 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 Ratio PI(22,7); PI.print(); // o.k. now
10.10 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 member functions 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 a C++ struct and a C++ class 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 Ratio { int num, den; };
is a valid definition of a Ratio 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, like this:
struct Ratio { int num, den; };
then the data members are set by default to be public. But this could be corrected simply by specifying the access specifier explicitly:
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