我应该为C ++中的成员变量和函数参数使用相同的名称吗? [英] Should I use the same name for a member variable and a function parameter in C++?
问题描述
我想知道在C ++中为成员变量和函数 parameter 使用相同的名称是否是一个好习惯.
I am wondering if it is a good practice to use the same name for both a member variable and a function parameter in C++.
我来自Java的背景,这很常见.我想知道在C ++中执行以下操作是否有弊端(代码有效):
I come from a Java background, where this was common. I am wondering if in C++ there are drawbacks doing the following (the code works):
class Player
{
public:
void setState(PlayerState *state)
{
this->state = state;
}
private:
PlayerState *state;
}
谢谢您的回答.据我了解,当它起作用时,更好的做法是放置某种标记,以将成员变量与函数参数区分开,例如:
Thank you for the answers. As I understand while it works, a better practice would be to put some kind of marker to differentiate member variable from function parameters like:
_ or m_
在某些编辑器(如Qt Designer)中,成员变量以不同的颜色显示.这就是为什么似乎没有必要添加任何前缀的原因.
In some editors (like Qt Designer), member variables are shows in a different color. This is why it did not seem necessary to add any prefixes.
推荐答案
这是正确的,并且是标准允许的.但是更好的方法是对成员变量使用一些命名约定.例如,您可以对所有成员变量使用m_
前缀,然后任何人都可以推断出m_state
是什么.它提高了代码的可读性,并避免了常见的错误.
That is correct, and allowed by the Standard. But a better approach is to use some naming-convention for member variables. For example, you could use m_
prefix for all member variables, then anyone could infer what m_state
is. It increases the readability of the code, and avoids common mistakes.
此外,如果m_state
是成员,则不必在成员函数中编写this->m_state = state
,只需编写m_state = state
.在您当前的代码中,this->
部分是必需的,没有它,state = state
将成为自赋值.
Also, if m_state
is the member, then you don't have to write this->m_state = state
in the member function, you could just write m_state = state
. In your current code, this->
part becomes necessary, without which state = state
will become self-assignment.
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