本文深入探讨了NSSet在Apple Core Foundations框架中的实现细节。NSSet基于CFSet构建，而CFSet使用CFBasicHash进行工作，通过哈希表模板生成代码。文章讨论了可变性和不可变性的区别，主要体现在结构体中的一个标志位，以及对CFBasicHashAddValue等函数调用的影响。此外，还提到了Cobbal关于两种类型在copy/retain行为上的观点。
Well, as Bavarious pointed out in a comment, Apple's actual CoreFoundation source is open and available for your perusal too. NSSet is implemented on top of CFSet, whose code is generated (as is that of CFDictionary) from a hash table template, using CFBasicHash to do the work.
The difference between mutablility and immutability seems to be the matter of a flag in the structure (line 91 of CFBasicHash.h), and from my reading so far just affects calls to functions such as CFBasicHashAddValue; there's a simple check for the mutability. It seems likely, however, that Cobbal is right about the copy/retain behavior between the two (I just haven't read that far yet).
保证数据的唯一性。
https://stackoverflow.com/questions/5863510/nsset-implementation
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