如果不是内存地址，C 指针究竟是什么? [英] What exactly is a C pointer if not a memory address?
问题描述
在有关 C 的知名来源中，在讨论了 & 运算符后给出了以下信息:
In a reputable source about C, the following information is given after discussing the & operator:
... 术语[address of] 保留下来有点遗憾，因为它混淆了那些不知道地址是什么的人，并误导了那些知道地址的人:将指针视为如果他们是地址通常会导致悲伤......
... It's a bit unfortunate that the terminology [address of] remains, because it confuses those who don't know what addresses are about, and misleads those who do: thinking about pointers as if they were addresses usually leads to grief...
我读过的其他材料(我会说，来自同样有信誉的来源)总是毫不掩饰地将指针和 & 运算符称为提供内存地址.我很想继续寻找事情的真相，但是当有信誉的消息来源有点不同意时，这有点困难.
Other materials I have read (from equally reputable sources, I would say) have always unabashedly referred to pointers and the & operator as giving memory addresses. I would love to keep searching for the actuality of the matter, but it is kind of difficult when reputable sources KIND OF disagree.
现在我有点困惑——究竟是指针，那么，如果不是内存地址呢?
Now I am slightly confused--what exactly is a pointer, then, if not a memory address?
附言
作者后来说:...不过我会继续使用address of"这个词，因为发明一个不同的 [词] 会更糟.em>
The author later says: ...I will continue to use the term 'address of' though, because to invent a different one [term] would be even worse.
推荐答案
C 标准没有定义指针在内部是什么以及它在内部如何工作.这是有意为之，以免限制平台数量，其中 C 可以作为编译或解释语言来实现.
The C standard does not define what a pointer is internally and how it works internally. This is intentional so as not to limit the number of platforms, where C can be implemented as a compiled or interpreted language.
指针值可以是某种 ID 或句柄或几个 ID 的组合(对 x86 段和偏移量说你好)，不一定是真正的内存地址.此 ID 可以是任何内容，甚至是固定大小的文本字符串.非地址表示对于 C 解释器可能特别有用.
A pointer value can be some kind of ID or handle or a combination of several IDs (say hello to x86 segments and offsets) and not necessarily a real memory address. This ID could be anything, even a fixed-size text string. Non-address representations may be especially useful for a C interpreter.
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