c++ operator typename 转换函数

class Stock10 {private:int t = 1;public:friend ostream& operator<<(ostream&, const Stock10&);Stock10(int _t);operator double();};

Stock10::operator double() {return t;}

Stock10 s1 = 10; //构造函数加explicit,则禁用这种转换double t2 = s1;

operator double();

将类转换成相应的数据类型

与输值=操作符相反