1 #include <iostream>
2 #include <cstdlib>
3 #include <string>
4 using namespace std;
5
6 //初始化数据的时候,如果类中引用其他类,需要重写构造函数,int也是类
7 class myclass
8 {
9 public:
10 int x;
11 int y;
12
13 public:
14 myclass(int a,int b) : x(a),y(b)
15 {
16
17 }
18 };
19
20
21 union myu
22 {
23 string str1;
24 int a;
25 int b;
26 myu()
27 {
28 new(&str1)string;//调用构造函数
29 }
30 ~myu()
31 {
32 str1.~basic_string();//析构
33 }
34 };
35
36 void main()
37 {
38 myu my;
39 my.str1 = "234";
40 cout << my.str1 << endl;
41
42 myclass *p = new myclass[2]{ {1,2},{3,4} };
43 for (int i = 0; i < 2; i++)
44 {
45 cout << p[i].x << " " << p[i].y << endl;
46 }
47 cin.get();
48 }
