空指针算术 [英] Void Pointer Arithmetic

问题描述

给定一个void指针，如果我想使void指针指向x字节在前面，这将是最好的做法？

Given a void pointer, if I want to make the void pointer point to x bytes ahead, how will this be best done? Is there a better way than casting to a char pointer?

推荐答案

有更好的方法吗？转换成
a字符指针？

Is there a better way than casting to a char pointer?

否（除非有 char * 而不是 void * 开头，所以你不必强制转换）。

No (except having a char * instead of a void * to begin with, so you don't have to cast it at all).

如果这是不可取或不可能的，那么唯一的方法是：

If this is not desirable or possible, then the only way is:

ptr = static_cast<char *>(ptr) + offset;

（注意：如果你用C ++做这类东西，通常有一个更好的解决方案。除非你是一个专家，你已经排除了所有其他的选择，我建议你发布一个新的问题，如果有一个更好的方法来做你想做什么！）

(Note: if you are doing this sort of stuff in C++, usually there is a much better solution. Unless you are an expert and you already ruled out every other alternative, I suggest you post a new question asking if there is a better way to do what you're trying to do!)

这篇关于空指针算术的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！