存在什么合理的理由使一元运算符&过载? [英] What legitimate reasons exist to overload the unary operator&?

问题描述

好的，我一直受到启发去做一些头部冲击.似乎超载operator&会导致不小的痛苦.

Okay, I've been inspired to do some head punching. Seems like overloading operator& leads to not a small amount of pain.

存在哪些合理的超载情况?

What legitimate cases exist for overloading it?

(不能说我曾经做过....)

(Can't say I've ever done that....)

推荐答案

我似乎记得类似智能指针类的东西，它覆盖了operator&，因为它想返回所包含指针的地址而不是智能指针的地址.指针对象.不记得我在哪里看到过它，或者当时它似乎不是个好主意.

I seem to remember something like a smart pointer class which overrode operator& because it wanted to return the address of the contained pointer rather than the address of the smart pointer object. Can't remember where I saw it or whether it seemed like a good idea at the time.

Aha，记得:微软的 CComPtr .

Aha, remembered: Microsoft's CComPtr.

为了概括起见，在以下情况下，可能是有意义的:

To generalize, it might make sense under the following conditions:

• 您有一个伪装成其他物体的物体.
• 该对象可以获取指向其伪装对象的指针.

返回合法指针以外的任何东西都将违反最小惊讶原则.

Returning anything other than a legitimate pointer would violate the principle of least astonishment.

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