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Here addition operation is performed on two operands a and b of integer data type. But what if i wants to add two user defined variables. But in-order to perform any operation on user defined datatypes operator overloading is done Explicitly.
Providing additional meaning to the existing operators ,simply extends the functionality of operator. There are 6 operators that cannot be overloaded. There are two types of operators on which overloading is performed. As shown in diagram there are two types of operators Unary and Binary operators. These operators can be overloaded through these methods mentioned above. If declared and defined inside the class, Syntax will be: In the above syntax ,increment operator is overloaded for prefix operation using member function.
In the above program unary operator is overloaded using member function of the class. We performed prefix increment operation on a data member a. Earlier we discussed unary overloading of an increment operator using member function without returning any value.
Firstly an object of same class is created. Since object is of class type,return type of class will be classname i. So in order to return value we need to return value as as user defined datatype. Infix increment operation is performed above. To execute postfix operation ,a member function should be defined as. Difference between prefix operation and postfix. Binary overloading is performed on two operators. Binary operator overloading includes overloading of arithmetic and comparison operators.
Member function definition of binary operators contains one argument in argument list. And the argument will be object of classtype. It will receive only one argument of class type explicitly i. As discussed earlier,we can overload unary operator using friend function also. That means we can use friend function at the place of member function.
Since friend function can only be defined outside the class,definition of friend function is done outside. In the argument part you will create a reference object of the same class to access the value of a datamember.
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