typedef

宏在预处理时解释

typedef在编译时解释

用法一：定义函数指针

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1. #ifdef TYPEDEF_TEST
   
2. typedef int (*get_num_func)(int);
   
3. get_num_func get_num;
   
4. #else
   
5. int (*get_num)(int);
   
6. #endif
   
7. 
   
8. int my_get_num(int num)
   
9. {
   
10.     return num;
    
11. }
    
12. 
    
13. int main()
    
14. {
    
15.     get_num = my_get_num;
    
16.     (*get_num)(0);
    
17. 
    
18.     return 0;
    
19. }

用法二：定义变量类型别名

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1. typedef unsigned int guint;
   
2. 
   
3. typedef struct student{
   
4. char *name;
   
5. char *id;
   
6. }student_t;