C++17 Quick Syntax Reference: A Pocket Guide to the Language, APIs and Library

© Mikael Olsson 2018

Mikael OlssonC++17 Quick Syntax Referencehttps://doi.org/10.1007/978-1-4842-3600-0_20

20. Operator Overloading

Mikael Olsson¹ 

(1)

Hammarland, Finland

 

Operator overloading allows operators to be redefined and used where one or both of the operands are of a user-defined class. When it’s done correctly, this can simplify the code and make user-defined types as easy to use as the primitive types.

Operator Overloading Example

In the following example there is a class called MyNum with an integer field and a constructor for setting that field. The class also has an addition method that adds two MyNum objects and returns the result as a new object.

class MyNum

{

 public:

  int val;

  MyNum(int i) : val(i) {}

  MyNum add(MyNum &a) {

    return ...