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8.15 The copy constructor is called 7 times in this code. Each call to the function f requires 3 calls to the copy constructor: when the parameter is passed by value to u, when v is initialized, and when w is returned by value. The seventh call is for the initialization y. 8.16 The parentheses are needed in the expression
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( *p > . data because the direct member selection operator . has higher precedence than the dereferencing operator * . (See Appendix C.)
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9.1 INTRODUCTION
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C++ includes a rich store of 45 operators. They are summarized in Appendix C. These operators are defined automatically for the fundamental types (int, float, etc.). When you define a class, you are actually creating a new type. Most of the C++ operators can be overloaded to apply to your new class type. This chapter describes how to do that.
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9.2 OVERLOADING THE ASSIGNMENT OPERATOR
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Of all the operators, the assignment operator = is probably used the most. Its purpose is to copy one object to another. Like the default constructor, the copy constructor, and the destructor, the assignment operator is created automatically for every class that is defined. But also like those other three member functions, it can be defined explicitly in the class definition.
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EXAMPLE 9.1 Adding an Assignment Operator to the Rat ional Class
Here is a class interface for the Rat ional class, showing the default constructor, the copy constructor, and the assignment operator:
class Rational { public: Rational(int =0, int =l); Rational(const Rational&); void operator=(const Rational&); // other declarations go here private: int num; int den; > ;
// default constructor // copy constructor // assignment operator
Note the required syntax for the assignment operator. The name of this member function is operator = . Its argument list is the same as that of the copy constructor: it contains a single argument of the same class, passed by constant reference. , Here is the implementation of the overloaded assignment operator:
void { Rational: :operator=(const num = r.num; den = r.den; Rational& r)
It simply copies the member data from the object r to the object that owns the call. 249
OVERLOADING OPERATORS
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9.3 THE this POINTER C++ allows assignments to be chained together, like this:
x = y = z = 3.14;
This is executed first by assigning 3.14 to Z, then to Y, and finally to X. But, as Example 9.1 shows, the assignment operator is really a function named opera tar=. In this chain, the function is called three times. On its first call, it assigns 3.14 to Z, so the input to the function is 3.14. On its second call, it assigns 3.14 to Y, so its input again must be 3.14. So that value should be the output (Le., return value) of the first call. Similarly, the output of the second call should again be 3.14 to serve as the input to the third call. The three calls to this function are nested, like this:
fbL f(Y, f(z, 3.14)))
The point is that the assignment operator is a function that should return the value it assigns. Therefore, instead of the return type void, the assignment operator should return a reference to the same type as the object being assigned
Rational& operator=(Rational& r)
This allows assignments to be chained together.
EXAMPLE 9.2 The Preferred Function Prototype for an Overloaded Assignment Operator
class Rational { public: Rational(int =0, int =l); Rational(const Rational&); Rational& operator=(const Rational&); // other declarations go here private: int num; int den; // other declarations go here
// default constructor // copy constructor // assignment operator
The preferred syntax for the prototype of an overloaded assignment operator in a class
T& operator=(const T&);
The return type is a reference to an object of the same class T. But then this means that the function should return the object that is being assigned, in order for the assignment chain to work. So when the assignment operator is being overloaded as a class member function, it should return the object that owns the call. Since there is no other name available for this owner object, C++ defines a special pointer, named this, which points to the owner object. We can envision the this pointer like this:
Now we can give the correct implementation of the overloaded assignment operator:
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