hashtable rebuild()

[zhenchengdezhichi]

哈希表rebuild的时候为什么指针每一个都去移动一遍，只需要把头指针变更一下就可以了 应该。
for (TableEntry** oldChainPtr = oldBuckets; oldSize > 0;
--oldSize, ++oldChainPtr) {
for (TableEntry* hPtr = *oldChainPtr; hPtr != NULL;
hPtr = *oldChainPtr) {
*oldChainPtr = hPtr->fNext;

  unsigned index = hashIndexFromKey(hPtr->key);

  hPtr->fNext = fBuckets[index];//插入在前面的单链表
  fBuckets[index] = hPtr;
}

}
这段是否可以改成
int i = 0 ;
for (TableEntry** oldChainPtr = oldBuckets; i < oldSize;
++i, ++oldChainPtr) {
fBuckets[i ]=*oldChainPtr;
}

[tetherit]

English please?