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A comment on Understanding the Objective-C Runtime (2010). Parent comment

Re:Understanding the Objective-C Runtime (2010) by armadsen on Sunday May 26, 2019 @09:19PM (#20018747)
Objective-C 2.0 was part of 10.5 in 2007. It’s not directly tied to 64-bit support. You’re thinking of features that require the “modern runtime” which is only available on 64-bit Mac. Those features came after ObjC 2.0.
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Re:Understanding the Objective-C Runtime (2010) by saagarjha on Sunday May 26, 2019 @10:40PM (#20019038)
You're right, I mixed those two up. That's a bit too far back for me :)
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