C宏里面代码什么意思（附代码）
//安全遍历
#define list_for_each_safe(cur,tmp,list) \
for (cur = (list)->head.next,\
tmp = (cur)->next; \
cur = &(list)->head; \
cur = tmp,tmp = (tmp)->next)
list_for_each_safe(cur,tmp,dlist) {
dlist->del(cur);
}
为什么宏里面的方法重写了,