你什么时候应该使用“this” C ++中的关键字？ [英] When should you use the "this" keyword in C++?

问题描述

可能的重复项：

在C ++中过度使用这个代码气味

多年前，我习惯在访问成员变量时使用this->。我知道这不是绝对必要，但我认为更清楚。

Years ago, I got in the habit of using this-> when accessing member variables. I knew it wasn't strictly necessary, but I thought it was more clear.

然后，在某个时候，我开始更喜欢一个更简约的风格， ...

Then, at some point, I started to prefer a more minimalistic style and stopped this practice...

最近，我被一个更多的初级同学问我是否认为这是一个好主意，我发现我真的没有一个好的答案对于我的偏好...这是真的一个完全风格的选择，还是有真正的原因，为什么不加前缀 - >成员变量访问更好？

Recently I was asked by one of my more junior peers whether I thought it was a good idea and I found that I didn't really have a good answer for my preference... Is this really a wholly stylistic choice or are there real reasons why not prefixing this-> on member variable accesses is better?

推荐答案

虽然这是一个完全主观的问题，我认为一般的C ++社区喜欢不有 this-> 。它是杂乱的，完全不需要。

While this is a totally subjective question, I think the general C++ community prefers not to have this->. Its cluttering, and entirely not needed.

有些人使用它来区分成员变量和参数。一个更常见的做法是只使用一些下划线或 m 或 m _ 等等。

Some people use it to differentiate between member variables and parameters. A much more common practice is to just prefix your member variables with something, like a single underscore or an m, or m_, etc.

在我看来，这更容易阅读。如果你需要 this-> 来区分变量，你做错了。请更改参数名称（从 x 到 newX ）或具有成员变量命名约定。

That is much easier to read, in my opinion. If you need this-> to differentiate between variables, you're doing it wrong. Either change the parameter name (from x to newX) or have a member variable naming convention.

一致性是首选，因此您不需要为自己需要的少数案例强制 this-> 区分（注意在初始化器列表中这是完全明确定义的： x（x），其中成员 x 通过参数 x 初始化），只是得到更好的变量名。

Consistency is preferred, so instead of forcing this-> on yourself for the few cases you need to differentiate (note in initializer lists this is completely well-defined: x(x), where the member x is initialized by the parameter x), just get better variable names.

c $ c> this ：当我实际上需要实例的地址，无论什么原因。

This leaves the only time I use this: when I actually need the address of the instance, for whatever reason.

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