CO2402 Advanced Programming with C++ Lecture 15 Notes

CO2402: Advanced Programming
with C++ Lecture 15


Introduction to Overloading

1. Concept of Overloading

o Overloading refers to using the same name for more than one
operation or function. In C++, this includes function
overloading and operator overloading.

Example:




2. Difference Between Overloading and Overriding

o Overloading: Same name, different parameter types or
number of parameters.

o Overriding: Same name, same parameters in a base and
derived class, using the virtual keyword.

Operator Overloading

1. Definition and Syntax

o Operators can be overloaded to work with user-defined types,
such as classes. The syntax for overloading an operator
involves defining a function with the keyword operator
followed by the operator symbol.

Example:

, 2. Overloadable Operators

o Most operators in C++ can be overloaded, including
arithmetic operators (+, -, *, /), relational operators (==, <,
>), and more. However, certain operators, like . (member
access), :: (scope resolution), and ?: (ternary), cannot be
overloaded.

Example: The CTwoInts Class

1. Class Definition

o The CTwoInts class includes member variables mX and mY,
representing two integers. It demonstrates overloading
assignment and arithmetic operators.

Example:




2. Overloading the Assignment Operator (=)

o The assignment operator is overloaded to assign the values of
one CTwoInts object to another.

Example: