虚函数中构造函数的调用顺序

 1 /*曾经有段时间一直被构造函数中的虚函数所困扰，现在通过自己重新学习了一遍，标注一下容易忘记的知识*/
 2 #include<iostream>
 3 using namespace std;
 4 class Base0
 5 {
 6   public:
 7    Base0(int var):var0(var)
 8    {
 9        cout<<"Construct base0"<<endl;
10    } ;
11    int var0;
12    void fun()
13    {
14        cout<<"Menber of Base0"<<endl;
15    }
16 
17 };
18 class Base1 :virtual public Base0
19 {
20     public:
21     Base1(int var)  :Base0(var)
22     {
23            cout<<"Construct base1"<<endl;
24     }
25     int var1 ;
26 };
27 class Base2 : virtual public Base0
28 {
29     public :
30     Base2(int var): Base0(var)
31     {
32            cout<<"Construct base2"<<endl;
33     }
34     int var;
35 };
36 class Derived : public Base2,public Base1  //构造函数的执行顺序与这儿有关
37 {
38     public :
39     Derived(int var) : Base2(var),Base1(var),Base0(var)
40     {
41            cout<<"Construct Derived"<<endl;
42     }
43     int var;
44     void fun()
45     {
46         cout<<"Member of Derived"<<endl;
47     }
48 };
49 int main()
50 {
51   Derived d(1);
52   d.var=2;
53   d.fun();
54     return 0;
55 }