C++ 错误：为参数 1 提供的默认参数
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error: default argument given for parameter 1
提问by pocoa
I'm getting this error message with the code below:
我收到以下代码的错误消息：
class Money {
public:
Money(float amount, int moneyType);
string asString(bool shortVersion=true);
private:
float amount;
int moneyType;
};
First I thought that default parameters are not allowed as a first parameter in C++ but it is allowed.
首先我认为默认参数不允许作为 C++ 中的第一个参数，但它是允许的。
回答by Yacoby
You are probably redefining the default parameter in the implementation of the function. It should only be defined in the function declaration.
您可能正在重新定义函数实现中的默认参数。它应该只在函数声明中定义。
//bad (this won't compile)
string Money::asString(bool shortVersion=true){
}
//good (The default parameter is commented out, but you can remove it totally)
string Money::asString(bool shortVersion /*=true*/){
}
//also fine, but maybe less clear as the commented out default parameter is removed
string Money::asString(bool shortVersion){
}
