43.c++指针类型转换

  • 数据类型转换(static_cast) 
    //数据类型转换
printf("%d\n", static_cast<int>(10.2));

     

  • 指针类型转换(reinterpret_cast) 
    1 指针类型转换
2 int *pint = new int(1);
3 char *pch = reinterpret_cast<char *>(pint);

     

  • 涉及到const的指针类型转换(const_cast) 
    1 const int num[5] = { 1,2,3,4,5 };
2 const int *p = num;
3 int *pint = const_cast<int *>(p);

     

     

  • 子类转化为父类(dynamic_cast) 
     1 class man
 2 {
 3 public:
 4     int name;
 5     //加上virtual关键字,可以使得父类用子类初始化后可以调用子类的函数
 6     virtual void run()
 7     {
 8         cout << "man is running" << endl;
 9     }
10 };
11 
12 class son :public man
13 {
14 public:
15     void run()
16     {
17         cout << "son is running" << endl;
18     }
19 };
20 
21 void main()
22 {
23     /*man man1;
24     son son1;
25     man *p = &man1;
26     p->run();
27     p = &son1;
28     p->run();*/
29     man *pman = new man;
30     son *pson = new son;
31     //子类指针转换为父类指针,但是还是调用子类的函数
32     man *pfu = dynamic_cast<man *>(pson);
33     pfu->run();
34     system("pause");
35 }

     

posted @ 2018-03-12 19:55  喵小喵~  阅读(6844)  评论(0)  编辑  收藏  举报