| commit | author | age | ||
| b8e5f6 | 1 | #include <stdio.h> |
| G | 2 | #include <stddef.h> |
| 3 | ||
| 4 | #define container_of(ptr, type, member) ({ \ | |
| 5 | const typeof(((type *)0)->member) *__mptr = (ptr); \ | |
| 6 | (type *)((char *)__mptr - offsetof(type, member)); \ | |
| 7 | }) | |
| 8 | ||
| 9 | struct student_s | |
| 10 | { | |
| 11 | char name[50]; | |
| 12 | int age; | |
| 13 | }; | |
| 14 | ||
| 15 | void print_student(int *p_age) | |
| 16 | { | |
| 17 | struct student_s *p_student; | |
| 18 | ||
| 19 | // 使用 container_of 获取指向 student_s 结构体的指针 | |
| 20 | p_student = container_of(p_age, struct student_s, age); | |
| 21 | ||
| 22 | printf("Name: %s, Age: %d\n", p_student->name, p_student->age); | |
| 23 | ||
| 24 | return ; | |
| 25 | } | |
| 26 | ||
| 27 | int main(void) | |
| 28 | { | |
| 29 | struct student_s student = {"Zhang San", 30}; | |
| 30 | ||
| 31 | print_student(&student.age); | |
| 32 | ||
| 33 | return 0; | |
| 34 | } | |
| 35 | ||
