是否指针运算有阵列以外的用途？ [英] Does pointer arithmetic have uses outside of arrays?

问题描述

我想我明白指针运算的语义还算不错，但我只看到过的例子使用数组的时候。它有不能由较少不透明的装置来实现的任何其他用途？我敢肯定，你可以找到聪明铸造的方式来使用它访问一个结构的成员，但我不知道为什么你会烦。我用C最感兴趣，但我会用C ++标记，因为答案很可能适用也有。

I think I understand the semantics of pointer arithmetic fairly well, but I only ever see examples when dealing with arrays. Does it have any other uses that can't be achieved by less opaque means? I'm sure you could find a way with clever casting to use it to access members of a struct, but I'm not sure why you'd bother. I'm mostly interested in C, but I'll tag with C++ because the answer probably applies there too.

编辑，根据回答接收到目前为止：我知道指针可以在许多非阵列的环境中使用。我特别想知道的指针运算，例如递增，走差异，等等。

Edit, based on answers received so far: I know pointers can be used in many non-array contexts. I'm specifically wondering about arithmetic on pointers, e.g. incrementing, taking a difference, etc.

推荐答案

如果你遵循语言标准的信，然后指针运算的只有的指向数组时定义，而不是在任何另一种情况。

If you follow the language standard to the letter, then pointer arithmetic is only defined when pointing to an array, and not in any other case.

一个指针可能指向数组中的任何元素，或者一步到位的过去的数组的结尾。

A pointer may point to any element of an array, or one step past the end of the array.

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