C++20 Quick Syntax Reference by Mikael Olsson

Author:Mikael Olsson
Language: eng
Format: epub
ISBN: 9781484259955
Publisher: Apress

Calling the getArea method from Rectangle’s interface will now invoke Triangle’s implementation. This is called polymorphism—when a method call causes a different method to be executed depending on the type of object that invokes the method. Note that polymorphism requires the use of references or pointers.Triangle t { 2,3 };

Rectangle& r = t;

r.getArea(); // 3 (2*3/2) calls Triangle's version

C++11 added the override specifier, which indicates that a method is intended to replace an inherited method. Using this specifier allows the compiler to check that there is a virtual method with that same signature. This prevents the possibility of accidentally creating a new virtual method in a derived class. It is recommended to always include this specifier when overriding methods.class Triangle : public Rectangle

{

public:

virtual double getArea() override { return x * y / 2; }

};

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