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11.1 11.2 11.3 11.4 11.5 How is the operator keyword used What does *this always refer to Why can t the this pointer be used in nonmember functions Why should the overloaded assignment operator return *this What is the difference between the effects of the following two declarations:
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Ratio y = x; Ratio y; y = x; Why can t ** be overloaded as an exponentiation operator Why should the stream operators << and >> be overloaded as friend functions Why should the arithmetic operators +, -, *, and / be overloaded as friend functions
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11.7 11.8 11.9 11.10 How is the overloaded pre-increment operator defintion distinguished from that of the overloaded post-increment operator 11.11 Why is the int argument in the implementation of the post-increment operator left unnamed 11.12 What mechanism allows the overloaded subscript operator [] to be used on the left side of an assignment statement, like this: v[2] = 22
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11.1 11.2 Implement the binary subtraction operator, the unary negation operator, and the less-than operator < for the Ratio class (see Example 11.4 on page 259). Implement a Vector class, with a default constructor, a copy constructor, a destructor, and overloaded assignment operator, subscript operator, equality operator, stream insertion operator, and stream extraction operator. Implement the addition and division operators for the Ratio class (see Example 11.5 on page 259). Rewrite the overloaded input operator for the Ratio class (Example 11.9 on page 262) so that, instead of prompting for the numerator and denominator, it reads a fraction type as 22/7 . Implement an overloaded assignment operator = for the Point class (see Problem 10.1 on page 249). Implement overloaded stream insertion operator << for the Point class (see Problem 10.1 on page 249). Implement overloaded comparison operators == and != for the Point class (see Problem 10.1 on page 249). Implement overloaded addition operator + and subtraction operator - for the Point class (see Problem 10.1 on page 249). Implement an overloaded multiplication operator * to return the dot product of two Point objects (see Problem 10.1 on page 249).
11.3 11.4
11.5 11.6 11.7 11.8 11.9
OVERLOADING OPERATORS
[CHAP. 11
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11.1 11.2 11.3 11.4 11.5 11.6 11.7 11.8 The operator keyword is used to form the name of a function that overloads an operator. For example, the name of the function that overloads the assignment operator = is operator= . The expression *this always refers to the object that owns the call of the member function in which the expression appears. Therefore, it can only be used within member functions. The keyword this is a pointer to the object that owns the call of the member function in which the expression appears. The overloaded assignment operator should return *this so that the operator can be used in a cascade of calls, like this: w = x = y = z; There is no difference. Both declarations use the copy constructor to create the object y as a duplicate of the object x. The declaration Ratio y = x; calls the copy constructor. The code Ratio y; y = x; calls the default constructor and then the assignment operator. The symbol ** cannot be overloaded as an operator because it is not a C++ operator. The stream operators << and >> should be overloaded as friend functions because their left operands should be stream objects. If an overloaded operator is a member function, then its left operand is *this, which is an object of the class to which the function is a member. The arithmetic operators +, -, *, and / should be overloaded as friend functions so that their left operands can be declared as const. This allows, for example, the use of an expression like 22 + x. If an overloaded operator is a member function, then its left operand is *this, which is not const. The overloaded pre-increment operator has no arguments. The overloaded post-increment operator has one (dummy) argument, of type int. The int argument in the implementation of the post-increment operator is left unnamed because it is not used. It is a dummy argument. By returning a reference, the overloaded subscript operator [] can be used on the left side of an assignment statement, like this: v[2] = 22. This is because, as a reference, v[2] is an lvalue.
11.10 11.11 11.12
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