C的offsetof跟container_of
C的offsetof和container_of
#include <stdio.h>
#include <stddef.h>
// #define offsetof(s, m) (size_t)&(((s *)0)->m)
struct A
{
int a;
int b;
};
int main()
{
printf("%d\n", offsetof(struct A, b));
return 0;
}
http://blog.****.net/pengzhixi/article/details/4275887
#define container_of(ptr, type, member) \
((type *) ((char *) (ptr) - offsetof(type, member)))