error：为参数1给出的默认参数 [英] error: default argument given for parameter 1

问题描述

我收到以下错误讯息：

class Money {
public:
    Money(float amount, int moneyType);
    string asString(bool shortVersion=true);
private:
    float amount;
    int moneyType;
};

首先我认为默认参数不允许作为C ++中的第一个参数，但允许。 / p>

First I thought that default parameters are not allowed as a first parameter in C++ but it is allowed.

推荐答案

您可能正在重新定义函数实现中的默认参数。它只应在函数声明中定义。

You are probably redefining the default parameter in the implementation of the function. It should only be defined in the function declaration.

//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){
}

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