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C++ Operator Overloading Guide

The document discusses operator overloading and friend functions. It defines operator overloading as overloading an operator with multiple jobs, allowing for compiler-time polymorphism. It provides rules for overloading operators and examples of overloading binary and unary operators. The document also defines friend functions as non-member functions that can access private members of a class, and notes they must be defined outside the class and have no caller object. It gives an example of a friend function and discusses how operators can be overloaded as friend functions.

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MUNESH SINGH
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58 views11 pages

C++ Operator Overloading Guide

The document discusses operator overloading and friend functions. It defines operator overloading as overloading an operator with multiple jobs, allowing for compiler-time polymorphism. It provides rules for overloading operators and examples of overloading binary and unary operators. The document also defines friend functions as non-member functions that can access private members of a class, and notes they must be defined outside the class and have no caller object. It gives an example of a friend function and discusses how operators can be overloaded as friend functions.

Uploaded by

MUNESH SINGH
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Operator

Overloading &
Friend
Function Operator Overloading & Friend Function
Dr. Munesh
Singh

Dr. Munesh Singh

Indian Institute of Information Technology


Design and Manufacturing,
Kancheepuram
Chennai-600127

January 18, 2019


Operator Overloading

Operator
Overloading &
Friend
Function

Dr. Munesh
Singh When an operator is overloaded with multiple jobs, it is
known as operator overloading
It is a way to implement compiler time polymorphism.

Rules to Remember
Any symbol can be used as function name
If it is a valid operator in C language
If it is preceded by operator keyword
You can not overload sizeof and ?: operator
Operator Overloading

Operator
Overloading &
Friend
Binary Operator Overloading +
Function

Dr. Munesh
Singh
Operator Overloading

Operator
Overloading & Uniary Operator Overloading -
Friend
Function

Dr. Munesh
Singh
Operator Overloading

Operator
Overloading & Uniary Operator Overloading ++
Friend
Function

Dr. Munesh
Singh
Friend Function

Operator
Overloading &
Friend
Function

Dr. Munesh Friend Function is not a member function of a class to


Singh
which it is a friend
Friend function is declared in the class with friend keyword
It must be defined outside the class to which it is friend
Friend function can access any member of the class to
which it is friend
Friend function cannot access members of the class
directly
It has no caller object
It should not be defined with membership label
Friend Function Example

Operator
Overloading &
Friend
Function

Dr. Munesh
Singh
Friend Function Feature

Operator
Overloading & Friend Function can become friend to more than one class
Friend
Function

Dr. Munesh
Singh
Friend Function Feature

Operator
Overloading &
Friend
Function
Friend function overloading of Binary Operator
Dr. Munesh
Singh Overloading of operators as a friend function
Friend Function Feature

Operator
Overloading &
Friend
Function
Friend function overloading of Uniary Operator
Dr. Munesh Overloading of operators as a friend function
Singh
Friend Function

Operator
Overloading & Member function of one class can become friend to
Friend
Function another class
Dr. Munesh
Singh

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