多重继承和有内嵌对象时构造函数调用顺序

顺序：

1，调用按照声明顺序的基类构造函数

2，调用内嵌对象构造函数

3，调用自身构造函数

 

（总是先人后己嘛，先老人（基类）后客人（内嵌对象），自己家小孩儿就不要管大人之间的事儿（不调用派生类构造函数））

 

这里C继承B和A，内嵌D，E继承C；调用构造函数情况：

 

 

测试：

 1 #include<iostream>
 2 using namespace std ;
 3 class D
 4 {
 5 public:
 6     D(){cout<<"initializing D..."<<endl;}
 7     ~D(){cout<<"destroying D..."<<endl;}
 8 };
 9 class A
10 { 
11 public:
12     A(){cout<<"initializing A..."<<endl;}
13     ~A(){cout<<"destroying A..."<<endl;}
14 };
15 class B
16 {
17 public:
18     B(){cout<<"initializing B..."<<endl;}
19     ~B(){cout<<"destroying B..."<<endl;}
20 };
21 class C : private B  , public A 
22 {
23 public:
24     D d;
25     C(){cout<<"initializing C..."<<endl;}
26     ~C(){cout<<"destroying C..."<<endl;}
27 };
28 class E: public C
29 {
30 public:
31     E(){cout<<"initializing E..."<<endl;}
32     ~E(){cout<<"destroying E..."<<endl;}
33 };
34 int main()
35 {
36     C c;  
37     return 0 ;
38 }

 

转载于:https://www.cnblogs.com/dot-dot-123/p/3631038.html