C++虚基类的初始化

浏览数：33 / 时间：2015年06月08日

 1 #include<iostream>
 2 using namespace std;
 3 class Base{
 4     public:
 5         Base(int sa)
 6         {
 7             a=sa;
 8             cout<<"Constructing Base"<<endl;
 9         }
10     private://私有变量，不可在派生类中直接使用 
11         int a;
12 };
13 class Base1:virtual public Base{
14     public:
15         Base1(int sa,int sb):Base (sa)
16         {
17             b=sb;
18             cout<<"Constructing Base1"<<endl;
19         }
20     private:
21         int b;
22 }; 
23 class Base2:virtual public Base{
24     public:
25         Base2(int sa,int sc):Base(sa)
26         {
27             c=sc;
28             cout<<"Constructing Base2"<<endl;
29         }
30     private:
31         int c;
32 };
33 class Derived:public Base1,public Base2{
34     public:
35         Derived(int sa,int sb,int sc,int sd)
36         :Base(sa),Base1(sa,sb),Base2(sa,sc)
37         //如果Base类不是虚基类，就不能使用这种方式调用基类的构造函数 
38         {
39             d=sd;
40             cout<<"Constructing Derived"<<endl;
41         }
42     private:
43         int d;
44 };
45 int main()
46 {
47     Derived obj(2,4,6,8);
48     return 0;
49 }
50 
51 /*
52 执行结果 
53 Constructing Base
54 Constructing Base1
55 Constructing Base2
56 Constructing Derived
57 */