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

正如标题本身所提到的那样-为什么引用的指针非法，而在C ++中则相反?

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

谢谢.

推荐答案

指针需要指向对象.引用不是对象.

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

如果有引用r，则一旦对其进行初始化，则每次使用r时，实际上就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，您不能首先获取引用的地址才能获得指向它的指针.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 = ℞

在最后一行中，&rx接受rx所引用的对象的地址，因此它与您所说的&x完全相同.

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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