May 2012
Intermediate to advanced
679 pages
16h 56m
English
Content preview from Object Oriented Programming with C++, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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13.4 VIRTUAL FUNCTIONS
13.4.1 Need for virtual functions
Logically, when a pointer is pointing to derived class object, method from the corresponding derived class should be executed. When the pointer in question is a base class pointer, this is not happening. Somehow, the language must have a provision to circumvent this difficulty. This calls for the concept of virtual functions.
If we declare such a function as virtual in the base class then the problem gets solved. It may be noted that keyword virtual can be applied only to a method from the class. (In other words global functions cannot be declared virtual.) Let us study the syntax and effect of a virtual declaration on a base class function.
13.4.2 Declaring function virtual
Let us redefine ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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