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_15

15. Overriding

Mikael Olsson¹ 

(1)

Hammarland, Finland

 

A new method in a derived class can redefine a method in a base class in order to give it a new implementation.

Hiding Derived Members

In the following example, Rectangle’s getArea method is redeclared in Triangle with the same signature. The signature includes the name, parameter list, and return type of the method.

class Rectangle

{

 public:

  int x, y;

  int getArea() { return x * y; }

};

class Triangle : public Rectangle

{

 public:

  Triangle(int a, int b) { x = a; y = b; }

  int getArea() { return x * y / 2; }

};

If a Triangle object is created and the getArea method is invoked, then Triangle’s ...