Rosyna Keller
Hmm @gte just reminded me that people without systems programming experience often cannot imagine the requirements https://en.m.wikipedia.org/wiki/System_programming …
Guy English
Marcel Weiher
Michael Tsai-
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@mjtsai Things like non-pointer isa (http://www.sealiesoftware.com/blog/archive/2013/09/24/objc_explain_Non-pointer_isa.html …) wouldn't be possible if Class hadn't become opaque. - View other replies
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@mjtsai Fast enumeration. non-fragile instance vars also means unused ivars can be removed from a class definition. -
@rosyna Why wouldn't fast enumeration have been possible before? Were there really a lot of unused ivars removed? -
@mjtsai Fast enumeration requires a lot of compiler support and it just happened to be an Objective-C 2.0 feature. https://www.mikeash.com/pyblog/friday-qa-2010-04-16-implementing-fast-enumeration.html … - View other replies
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@mjtsai And many of the older classes (NSMenu, NSView, NSWindow, et cetera) have ivars no longer in use. - View other replies
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@mjtsai In fact, NSWindow got so insane that a new class, NSWindowAuxiliary, was created to hold the additional ivars. -
@mjtsai As NSWindowAuxilary isn't public, Apple can add and remove ivars as needed without having the fragile base class problem. -
@rosyna So why are they still using it now that we have Objective-C 2? - View other replies
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