我有一个关于运算符以及如何重载它们的问题。有一个代码示例,我正在重载 operator<<
但它不起作用。我使用的类(class):
class CStudent{ //class for students and their attributes
int m_id;
int m_age;
float m_studyAverage;
public:
CStudent(int initId, int initAge, float initStudyAverage): m_id(initId), m_age(initAge), m_studyAverage(initStudyAverage){}
int changeId(int newId){
m_id = newId;
return m_id;
}
int increaseAge(){
m_age++;
return m_age;
}
float changeStudyAverage(float value){
m_studyAverage += value;
return m_studyAverage;
}
void printDetails(){
cout << m_id << endl;
cout << m_age << endl;
cout << m_studyAverage << endl;
}
friend ostream operator<< (ostream stream, const CStudent student);
};
过载:
ostream operator<< (ostream stream, const CStudent student){
stream << student.m_id << endl;
stream << student.m_age << endl;
stream << student.m_studyAverage << endl;
return stream;
}
还有主要方法:
int main(){
CStudent peter(1564212,20,1.1);
CStudent carl(154624,24,2.6);
cout << "Before the change" << endl;
peter.printDetails();
cout << carl;
peter.increaseAge();
peter.changeStudyAverage(0.3);
carl.changeId(221783);
carl.changeStudyAverage(-1.1);
cout << "After the change" << endl;
peter.printDetails();
cout << carl;
return 0;
}
问题出在哪里?
最佳答案
这里的问题是您需要了解什么是引用以及 std::ostream 和 std::ostream& 之间的区别。
std::ostream& operator<< (std::ostream& stream, const CStudent& student)
关于C++ 运算符重载不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16503104/