C++ 虚继承

查看多继承。当多继承classes属性合理但是name属性会出现麻烦。会出现两个不同name舒属性。

通过虚继承某个基,就是在告诉编译器,从当前这个再派生出来的子类只能拥有那个基类的一个实例。

从student和teacher都虚继承自person类,编译器将确保从student和teacher类再派生出来的子类只拥有一份person类c#委托的属性。

c#是什么语言继承语法:classTeacher:virtualpublicPerson{}


#include <iostream>
#include <string>
class Person
{
public:
Person(std::string theName);
void intorduce();
protected:
std::string name;
};
class Teacher: virtual public Person  //注意这里
{
public:
Teacher(std::string theName, std::string theClass);
void teach();
void introduce();
protected:
std::string classes;
};
class Student : virtual public Person //注意这里
{
public:
Student(std::string theName, std::string theClass);
void attendClass();
void introduce();
protected:
std::string classes;
};
class TeachingStudent : public Student,public Teacher   //  注意,  这里为 多继承
{
public:
TeachingStudent(std::string theName, std::string classTeaching, std::string classAttending);
void introduce();
};
Person::Person(std::string theName)
{
name = theName;
}
void Person::intorduce()
{
std::cout<<"大家好 我是"<< name << "。\n\n";
}
Teacher::Teacher(std::string theName, std::string theClass) : Person(theName)
{
classes = theClass;
}
void Teacher::teach()
{
std::cout << name <<"教 "<< classes ;
}
void Teacher::introduce()
{
std::cout<<"大家好 我是"<<name <<"我教"<<classes;
}
Student::Student(std::string theName,std::string theClass):Person(theName)
{
classes = theClass;
}
void Student::attendClass()
{
std::cout<<name<<"加入"<<classes<<"学习。\n\n";
}
void Student::introduce()
{
std::cout<<"大家好,我是"<< name <<",我在 "<<classes<<"学习。\n\n";
}
TeachingStudent::TeachingStudent(std::string theName,
std::string classTeaching,
std::string classAttending)
:
Teacher(theName,classTeaching),
Student(theName,classAttending),
Person(theName)   //注意这里 虚继承的不同,
{
}
void TeachingStudent::introduce()
{
std::cout<<"大家好我是"<<name<<"。我教"<<Teacher::classes<<",";   // 注意这里  student::name  变为name
std::cout<<"同时我是"<<Student::classes<<"学习。\n\n";
}
int main()
{
Teacher teacher("小甲鱼","C++入门");
Student student("迷途羔羊","C++入门");
TeachingStudent teachingStudent("丁丁","C++入门","C++进阶");
teacher.introduce();
teacher.teach();
student.introduce();
student.attendClass();
teachingStudent.introduce();
teachingStudent.teach();
teachingStudent.attendClass();
std::cout<<"tesd";
return 0;
}