编辑:仅将其更改为一个问题,感谢您的反馈!
我有这个向量
vector<Artifact> art;
art.emplace_back("Ipad", 349.99);
art.emplace_back("Gameboy", 29.99);
art.emplace_back("Xbox", 229.99);
art.emplace_back("SamsungTV", 559.99);
art.emplace_back("AirCon", 319.99);
这些项目给我一个错误
C2661 'Artifact::Artifact': no overloaded function takes 2 arguments
我不明白为什么会给我这个错误,我有一个带有7个参数的构造函数,但是我只需要Name和Price就可以了。
编辑:这是最小的可复制示例:
class Item {
public:
virtual double GetTotalPrice();
};
//Class artifact now inherits Item
class Artifact : public Item
{
private:
string GUID;
string Name;
string Description;
string Category;
double Price;
double Discount;
enum DiscountType { Amount, Percentage };
int Quantity;
public:
//Constructor
Artifact(string GUID, string Name, string Description, string Category, double Price, double Discount, int Quantity)
{
this->GUID = GUID;
this->Name = Name;
this->Description = Description;
this->Category = Category;
this->Price = Price;
this->Discount = Discount;
this->Quantity = Quantity;
}
//default constructor
Artifact();
void set_name(const string& name)
{
Name = name;
}
void set_price(double price)
{
if (Price > 0)
{
Price = price;
}
else cout << "Price cannot be negative!";
};
int main()
{
vector<Artifact> art;
art.emplace_back("Ipad", 349.99);
art.emplace_back("Gameboy", 29.99);
art.emplace_back("Xbox", 229.99);
art.emplace_back("SamsungTV", 559.99);
art.emplace_back("AirCon", 319.99);
return 0;
}
基本上,您得到的错误是因为您有两个构造函数(一个默认构造函数带有0个参数,另一个带有7个参数版本),但是您仅将两个值传递给emplace_back
。传递给emplace_back
的值将转发到Artifact
的构造函数。
有两种可能的解决方法。首先,创建另一个仅接受两个值的构造函数,如下所示:
Artifact(string Name, double Price) : Artifact("", Name, "", "", Price, 0., 0 ) {}
或者,您可以修改现有的7参数构造函数以使用默认值
// note the reordering of parameters here
Artifact(string name, double Price, string GUID= "",
string Description = "", string Category = "",
double Discount = 0.0, int Quantity = 0) { … }