数据结构-链表逆置（c++模板类实现）

 1 template <class T>
 2 class SingleList;
 3 template <class T>
 4 class Node
 5 {
 6 private:
 7     T element;
 8     Node<T> *link;
 9     friend class SingleList<T>;
10 };

 1 template <class T>
 2 class SingleList
 3 {
 4 public:
 5     SingleList()
 6     {
 7         first = NULL;
 8         n = 0;
 9     }
10     ~SingleList();
11     void Upstream();
12 private:
13     Node<T>* first;
14 };

 1 template<class T>
 2 void SingleList<T>::Upstream()
 3 {
 4     Node<T> *p = first;
 5     Node<T> *curr = p->link;
 6     Node<T> *tmp = NULL;
 7 
 8     p->link = NULL;
 9     while (curr)
10     {
11         tmp = curr->link;
12         curr->link = p;
13         p = curr;
14         curr = tmp;
15 
16     }
17 
18     first->link = NULL;
19     first = p;
20 }