Im trying to overload the input operator on a userlogin class ive created. To use an operator on a class object it must be overloaded. This declaration should be made part of class example. Almost all standard c operators can be overloaded for classes. Operator overloading allows you to define the way operator works the way you want. The proposed method for extending a language uses operator overloading to map language operations to the. Since we will get to know the difference between the overloaded functions during compile time, it is also called compile time polymorphism. The value returned from an overloaded operator is the residual value of the expression containing that operator and its operands. The function name is the same but the parameters and returns type changes. Could be either the numerator of the fraction or the antiperiod of the repeating decimal number. The constructor and operator overloading introduced in modelica 3. An operator can only be overloaded if its operands include at least one class type, or it is a.
Thus a programmer can use operators with userdefined types as well. I have a rational number class is made up of two integers. Dont want to affect the input operands data members difference between. Should i make my operator overload be a member of a class, c1. Dont want to affect the input operands data members. It is extremely important that we pay close attention to the type and value returned. Normal order of operations and associativity apply cant be changed can overload each operator with various rhs types see next slide. This example illustrates the general syntax for overloading operators. Overloaded operators are functions with special names the keyword operator followed by the symbol for the operator being defined. Operator overloading types for operator overloading built in int, char or userdefined classes can use existing operators with userdefined types.
Almost all arithmetic operator can be overloaded to perform arithmetic operation on userdefined data type. The following operator is supposed to read the rational number from a stream. No compiletime errors are thrown, however the values are not set either. Like any other function, an overloaded operator has a.