详解C++中的菱形继承问题

#include<iostream>
using namespace std;
class fuelEngine //燃油引擎
{
private:
	int cylindenum;//汽缸数
public:
	fuelEngine(int c = 4):cylindenum(c){}
	~fuelEngine(){}
	void start(){}
};
class electricEngine//电动引擎
{
private:
	float power;
public:
	electricEngine(float p=60):power(p){}
	~electricEngine(){}
	void Start(){}
};
class Hybirdcar:public fuelEngine,public electricEngine//混动汽车
{
public:
	Hybirdcar(int c,int p):fuelEngine(c),electricEngine(p){}
	~Hybirdcar(){}
};

#include<iostream>
using namespace std;
class Base1
{
  public:
    int var;
    void fun()
    {
        cout<<"Member of Base1"<<endl;
    }
};
class Base2
{
  public:
    int var;
    void fun()
    {
        cout<<"Member of Base2"<<endl;
    }
};
class Derived:public Base1,public Base2
{
  public:
    int var;
    void fun(){cout<<"Member of Derived"<<endl;}
};
int main()
{
    Derived d;
    Derived *p = &d;
    //访问Derived类成员
    d.var =1;
    d.fun();
    //访问Base1基类成员
    d.Base1::var=2;
    d.Base1::fun();
    //访问Base2基类成员
    p->Base2::var=3;
    p->Base2::fun();
    return 0;
}

#include<iostream>
using namespace std;
class Person
{
private:
	int _idPerson;
public:
	Person(int id) :_idPerson(id) { cout << "Create Person" << endl; }
	~Person(){}
};
class Student:public Person//学生
{
private:
	int _snum;
public:
	Student(int id,int s):Person(id),_snum(s){}
	~Student(){}
};
class Employee:public Person//职工
{
private:
	int _enum;
public:
	Employee(int id,int e):Person(id),_enum(e){}
	~Employee(){}
};
class GStudent:public Student//研究生
{
private:
	int _gsnum;
public:
	GStudent(int g,int s,int id):Student(s,id),_gsnum(g){}
	~GStudent(){}
};
class EGStudent :public GStudent,public Employee//在职研究生
{
private:
	int _egsnum;
public:
	EGStudent(int es,int s,int g,int e,int sid,int eid)
		:GStudent(s,g,sid),Employee(e,eid),_egsnum(es){}
	~EGStudent(){}
};
int main()
{
	EGStudent egs(1,2,3,4,5,6);
	return 0;
}

#include<iostream>
using namespace std;
class Person
{
private:
	int _idPerson;
public:
	Person(int id) :_idPerson(id) { cout << "Create Person" << endl; }
	~Person(){}
};
class Student:public virtual Person//学生
{
private:
	int _snum;
public:
	Student(int id,int s):Person(id),_snum(s){}
	~Student(){}
};
class Employee:public virtual Person//职工
{
private:
	int _enum;
public:
	Employee(int id,int e):Person(id),_enum(e){}
	~Employee(){}
};
class GStudent:public Student//研究生
{
private:
	int _gsnum;
public:
	GStudent(int g,int s,int id):Student(s,id),Person(id),_gsnum(g){}
	~GStudent(){}
};
class EGStudent :public GStudent,public Employee
{
private:
	int _egsnum;
public:
	EGStudent(int es,int s,int g,int e,int id)
		:GStudent(s,g,id),Employee(e,id),_egsnum(es),Person(id){}
	~EGStudent(){}
};
int main()
{
	EGStudent egs(1, 2, 3, 4, 5);
	Person* p = &egs;
	return 0;
}