December 2001
Intermediate to advanced
416 pages
8h 16m
English
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3.9. Defining a Derived Class
In general, a derived class needs to program only those aspects of its behavior that differ from or extend the behavior of its base class. NotQuery, for example, must provide an eval() definition that implements the not semantics. It must also introduce an instance member to store the query operand it is negating, and a property to allow get and set access to the operand, if appropriate. Both the AndQuery and OrQuery classes must support left and right operands. The NameQuery member must support a string member. All must provide definition of the abstract eval() virtual method.
The derived class is considered abstract if either it introduces an abstract member or it does not provide an implementation for an inherited ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.