January 2011
Intermediate to advanced
1648 pages
70h 30m
English
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Designing Events for Use by Derived Classes
What about extenders of our CountDown type? Assume we’ve designed our countdown mechanism such that its core functionality can be overridden (for example, by marking Start as virtual) or we simply haven’t sealed the class. The subtype might want to raise any of our events as part of its extension. For example, a CountDown with an EmergencyStop facility might want to call Finished before the timer reaches zero. I invite you to think about more examples.
The key question is whether a subtype can raise an event declared on its base type. A little bit of reasoning can help answer this question without having to loop in the compiler just yet. You’ve seen how an event declaration leads to the creation of ...
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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.