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A class s constructor constructs the class objects by allocating and initializing storage for the objects and by performing any other tasks that are programmed into the function. It literally creates a live object from a pile of unused bits. We can visualize the relationships between the Ratio class itself and its instantiated objects like this:
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Ratio Ratio() print() x num den y -1 3
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The class itself is represented by a rounded box containing its member functions. Each function maintains a pointer, named this , which points to the object that is calling it. The snapshot here represents the status during the execution of the last line of the program, when the object y is calling the print() function: y.print(). At that moment, the this pointer for the constructor is NULL because it is not being called. A class may have several constructors. Like any other overloaded function, these are distinguished by their distinct parameter lists. EXAMPLE 10.4 Adding More Constructors to the Ratio Class
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class Ratio { public: Ratio() { num = 0; den = 1; } Ratio(int n) { num = n; den = 1; } Ratio(int n, int d) { num = n; den = d; } void print() { cout << num << '/' << den; } private: int num, den; }; int main() { Ratio x, y(4), z(22,7); cout << "x = "; x.print(); cout << "\ny = "; y.print(); cout << "\nz = "; z.print(); } x = 0/1 y = 4/1 z = 22/7 This version of the Ratio class has three constructors. The first has no parameters and initializes the declared object with the default values 0 and 1. The second constructor has one integer parameter and
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CLASSES
initializes the object to be the fractional equivalent to that integer. The third constructor is the same as in Example 10.2.
Among the various constructors that a class may have, the simplest is the one with no parameters. It is called the default constructor. If this constructor is not explicitly declared in the class definition, then the system will automatically create it for the class. That is what happens in Example 10.1. 10.4 CONSTRUCTOR INITIALIZATION LISTS Most constructors do nothing more than initialize the object s member data. Consequently, C++ provides a special syntactical device for constructors that simplifies this code. The device is an initialization list. Here is the third constructor in Example 10.2, rewritten using an initialization list:
Ratio(int n, int d) : num(n), den(d) { }
The assignment statements in the function s body that assigned n to num and d to den are removed. Their action is handled by the initialization list shown in boldface. Note that the list begins with a colon and precedes the function body which is now empty. Here is the Ratio class with its three constructors rewritten using initializer lists. EXAMPLE 10.5 Using Initializer Lists in the Ratio Class
class Ratio { public: Ratio() : num(0), den(1) { } Ratio(int n) : num(n), den(1) { } Ratio(int n, int d) : num(n), den(d) { } private: int num, den; };
Of course, these three separate constructors are not necessary. They can be combined into a single constructor, using default parameter values, as illustrated by the next example. EXAMPLE 10.6 Using Default Parameter Values in the Ratio Class Constructor
class Ratio { public: Ratio(int n=0, int d=1) : num(n), den(d) { } private: int num, den; }; int main() { Ratio x, y(4), z(22,7); } Here, x will represent 0/1, y will represent 4/1, and z will represent 22/7. Recall that the default values are used when actual parameters are not passed. So in the declaration of the Ratio object x where no values are passed, the formal parameter n is given the default value 0
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