Welcome back to another Friday Q&A. Now that WWDC is behind us, I'm back on track to bring you more juicy highly-technical goodness. Maybe I can even get back to doing one a week.... This week I'm going to take André Pang's suggestion of discussing process memory statistics (the stuff you see in Activity Monitor or top) in Mac OS X. Memory Structure Before I can discuss what the stats mean, I firs
Cocoa's Key-Value Observing facilities are extremely powerful and useful. Unfortunately they have a really terrible API that's inherently broken in a couple of different ways. I want to discuss how it's broken, and a way to make it better. What's Broken There are three major problems with the KVO API, all of which relate to multiple levels of the class hierarchy registering observers. This is impo
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