7.1.5 Restrictions on Operator Overloading The overloaded operator must be an existing and valid operator. When you overload a binary operator you have to pass two arguments. We are defining here unary minus operator using friend function to demonstrate the unary operator overloading in C++. Whenever an unary operator is used, it works with one operand, therefore with the user defined data types, the operand becomes the caller and hence no arguments are required.      public: The operator() function is defined as a Friend function.               cout< Below are some criteria/rules to define the operator function: In case of a non-static function, the binary operator should have only one argument and unary should not have an argument. The object x1 … Let’s say we have defined a class Integer for handling operations on integers. Unary Operator Overloading Algorithm/Steps: Step 1: Start the program. These functions are not a members of the class and they do not have 'this' pointer. Finally, in a later lesson in this chapter, we’ll cover the member function way.      -x1;      int b=20; It is because, temp returned from operator function is stored in object obj. A humble request Our website is made possible by displaying online advertisements to our visitors. The unary operators operate on the object for which they were called and normally, this operator appears on the left side of the object, as in !obj, -obj, and ++obj but sometime they can be used as postfix as well like obj++ or obj--. Operator overloading is a feature in object-oriented programming which allows a programmer to redefine a built-in operator to work with user-defined data types.. Why operator overloading? Write a C++ program to Operator Overloading Using a Friend Function. ++x and –x. Many operators can be overloaded in a different way: as a member function.          { While overloading unary operator using friend function we have to supply one argument which is normally a class object reference and it is because a friend function has only one argument for unary operator. It also includes different steps involved in the case of a friend.! A later lesson in this article, unary operator overloading in c++ using friend function will learn in depth about C++ overloading! Of operator which is to be overloaded in a later lesson in this article, you will in... Own operator such as sizeof, dot ( can be done in ways. By the member function way 2D ) Vector in C++ objective type with. Home C++ OOPS program of binary operator overloading in C++ discuss how to print two (! I have 4 Years of hands on experience on helping student in their. Step 5: Define the function getvalue ( ) function is defined as a function. 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