我正在尝试重载 << 运算符，以便像这样打印出学生对象：
Student: <name>,<number>,<email address>,<year>,<major>
尝试编译显示以下内容的程序时，我不断收到错误消息：
error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'const std::string' (or there is no acceptable conversion)
我的实现文件中的函数如下所示：
ostream& operator<<(ostream& output, const Student& student)
{
output << "Student: " << student.name <<", " << student.m_Number <<", " << student.email <<", " << student.year << ", " << student.major << endl;
return output;
}
我这个类的头文件：
#include <iostream>
using namespace std;
class Student
{
public:
//Default constructor
Student();
//Set the student information
Student setStudent(string[], int);
//Retrieve the Student M_Number
int getM_Number();
friend ostream& operator << (ostream& output, const Student& student);
private:
//Student's name, M_Number, Email Address, Year in School and Major
string name;
int m_Number;
string email;
string year;
string major;
};
如果有人可以帮助我弄清楚是什么给了我这个问题，我将不胜感激。