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2018 | OriginalPaper | Chapter

12. Operator Overloading

Authors : Ivor Horton, Peter Van Weert

Published in: Beginning C++17

Publisher: Apress

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Abstract

In this chapter, you’ll learn how to add support for operators such as add and subtract to your classes so that they can be applied to objects. This will make the types that you define behave more like fundamental data types and offer a more natural way to express some of the operations between objects. You’ve already seen how classes can have member functions that operate on the member variables of an object. Operator overloading enables you to write member functions that enable the basic operators to be applied to class objects.

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previous chapter Defining Your Own Data Types
next chapter Inheritance
Footnotes
1
The latter is new in C++17. Prior to C++17, compilers were free to choose in which order to evaluate the operands of overloaded operator functions. As of C++17, however, they have to follow the same rules as their built-in counterparts.
 
2
Prior to C++17, it was not even guaranteed that the left operand of an overloaded && or || operator would be evaluated before the right operand like it is for the built-in operators. That is, the compiler was allowed to evaluate the right operand before it even started evaluating the left operand. This would have made for another potential source of subtle bugs. This was also the reason that prior to C++17 overloading the comma operator (,) was generally discouraged.
 
Metadata
Title
Operator Overloading
Authors
Ivor Horton
Peter Van Weert
Copyright Year
2018
Publisher
Apress
Book
Beginning C++17

Print ISBN: 978-1-4842-3365-8

Electronic ISBN: 978-1-4842-3366-5

Copyright Year: 2018

DOI
https://doi.org/10.1007/978-1-4842-3366-5_12

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