为什么在 C++ 中指向引用的指针是非法的? [英] Why are pointers to a reference illegal in C++?

问题描述

正如标题本身提到的 - 为什么指向引用的指针是非法的，而在 C++ 中相反是合法的?

As the title itself mentions - why are pointer to a reference illegal, while the reverse is legal in C++?

推荐答案

一个指针需要指向一个对象.引用不是对象.

A pointer needs to point to an object. A reference is not an object.

如果你有一个引用 r，一旦它被初始化，任何时候你使用 r 你实际上是在使用引用所引用的对象.

If you have a reference r, once it is initialized, any time you use r you are actually using the object to which the reference refers.

因此，您无法首先获取引用的地址以获取指向它的指针.考虑以下代码:

Because of this, you can't take the address of a reference to be able to get a pointer to it in the first place. Consider the following code:

int x;
int& rx = x;

int* px = ℞

在最后一行，&rx 取的是rx 引用的对象的地址，所以和你说的& 完全一样;x.

In the last line, &rx takes the address of the object referred to by rx, so it's exactly the same as if you had said &x.

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