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Two functions can have the same name if the number and type of argument passed is different. Friend functions in c++ help us avoid the scenario where the function has to be a member of either of these classes for access. Without the friend function, we will require the object of these classes to access all the members. We might require a function, metro(), to access both these classes without any restrictions. To understand this better, let us consider two classes: Tokyo and Rio. This is only the case when we do not want to use the objects of that class to access these private or protected members. Use of Friend function in C++Īs discussed, we require friend functions whenever we have to access the private or protected members of a class. A class’s function definition does not use either the keyword friend or scope resolution operator (: □.įriend function is called as function_name(class_name) and member function is called as class_name. ![]() We can define the friend function anywhere in the program like a normal C++ function. In the above declaration, the keyword friend precedes the function. Function with argument and return valueįriend data_type function_name(arguments/s) //syntax of friend function.Function with argument but no return value.Function with no argument but with return value.Function with no argument and no return value.User-defined Function typesįriend functions in C++ have the following types Once declared as a friend function, the function is able to access the private and the protected members of these classes. Generally, non-member functions cannot access the private members of a particular class. In such cases, we make the desired function, a friend to both these classes which will allow accessing private and protected data of members of the class. ![]() These members may be data members, class functions or function templates. There could be situations in programming wherein we want two classes to share their members. So, what exactly is the friend function?Ī friend function in C++ is a function that is declared outside a class but is capable of accessing the private and protected members of the class. Friend functions are not member functions of the class. They are defined globally outside the class scope. What is Friend Function?įriend functions of the class are granted permission to access private and protected members of the class in C++. We use them when we need to operate between two different classes at the same time. We declare friend function inside the body of a class, whose private and protective data needs to be accessed, starting with the keyword friend to access the data. The friend function is declared using the friend keyword inside the body of the class.įriend returnType functionName(arguments) īy using the keyword, the ‘friend’ compiler understands that the given function is a friend function. What is a Friend Function in C++?Ī friend function in C++ is defined as a function that can access private, protected and public members of a class. #WRITE A PROGRAM OF MATRIX IN C USING FRIEND FUNCTION HOW TO#In this tutorial, we will learn how to create a friend function in C++ with the help of some examples.ĭata hiding is a fundamental concept in object-oriented programming, and it restricts the access of private members from outside the class.
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