fig03_15.cpp

经典书籍源代码啊。。。第三版。。。数据结构与算法分析——C++描述(第3版).

    class iterator : public const_iterator
    {
      public:
        iterator( )
          { }
    
        Object & operator* ( )
          { return retrieve( ); }
        const Object & operator* ( ) const
          { return const_iterator::operator*( ); }
            
        iterator & operator++ ( )
        {
            current = current->next;
            return *this;
        }
    
        iterator operator++ ( int )
        {
            iterator old = *this;
            ++( *this );
            return old;
        }
    
      protected:
        iterator( Node *p ) : const_iterator( p )
          { }
    
        friend class List<Object>;
    };