0001 template <typename T> void List<T>::traverse( void ( *visit )( T& ) ) //借助函数指针机制遍历
0002 {  for ( ListNodePosi<T> p = header->succ; p != trailer; p = p->succ ) visit ( p->data );  }
0003 
0004 template <typename T> template <typename VST> //元素类型、操作器
0005 void List<T>::traverse( VST& visit ) //借助函数对象机制遍历
0006 {  for ( ListNodePosi<T> p = header->succ; p != trailer; p = p->succ ) visit ( p->data );  }