C++ 重载括号运算符 [] 以获取和设置
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/11066564/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Overload bracket operators [] to get and set
提问by SagiLow
I have the following class:
我有以下课程：
class risc { // singleton
protected:
static unsigned long registers[8];
public:
unsigned long operator [](int i)
{
return registers[i];
}
};
as you can see I've implemented the square brackets operator for "getting".
Now I would like to implement it for setting, i.e.: risc[1] = 2.
如您所见，我已经为“获取”实现了方括号运算符。
现在我想实现它进行设置，即：risc[1] = 2。
How can it be done?
怎么做到呢？
回答by Andrew Durward
Try this:
尝试这个：
class risc { // singleton
protected:
static unsigned long registers[8];
public:
unsigned long operator [](int i) const {return registers[i];}
unsigned long & operator [](int i) {return registers[i];}
};
回答by Naveen
You need to return a reference from your operator[]so that the user of the class use it for setting the value. So the function signature would be unsigned long& operator [](int i).
您需要从您的引用返回一个引用，operator[]以便类的用户使用它来设置值。所以函数签名将是unsigned long& operator [](int i).
