July 2006
Intermediate to advanced
768 pages
16h 43m
English
Content preview from Agile Principles, Patterns, and Practices in C#
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35. Visitor
© Jennifer M. Kohnke
“’Tis some visitor,” I muttered, “tapping at my chamber door;
Only this and nothing more.”
—Edgar Allen Poe, The Raven
You need to add a new method to a hierarchy of classes, but the act of adding it will be painful or damaging to the design. This is a common problem. For example, suppose that you have a hierarchy of Modem objects. The base class has the generic methods common to all modems. The derivatives represent the drivers for many different modem manufacturers and types. Suppose also that you have a requirement to add a new method, named configureForUnix, to the hierarchy. This method will configure the ...
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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.