从“void *”到“unsigned char *”的转换无效 [英] Invalid conversion from ‘void*’ to ‘unsigned char*’

问题描述

我有以下代码：

void* buffer = operator new(100);
unsigned char* etherhead = buffer;

我在尝试编译时遇到以下错误：

I'm getting the following error for that line when trying to compile;

error: invalid conversion from ‘void*’ to ‘unsigned char*’

为什么会得到这个错误，我认为一个void是无类型的，所以它可以指向任何东西，或任何东西可以指向它？

Why do I get that error, I thought a void was "type-less" so it can point at anything, or anything can point to it?

推荐答案

您需要强制转换，因为您无法将void *转换为任何未转换的内容。

You need to cast as you can not convert a void* to anything without casting it first.

你需要做

unsigned char* etherhead = (unsigned char*)buffer;

（虽然你也可以使用 static_cast ）

(although you could use a static_cast also)

要了解有关void指针的更多信息，请查看 6.13 - 无效指针。

To learn more about void pointers, take a look at 6.13 — Void pointers.

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