1 #ifndef _List_H_
  2 #define _List_H_
  3 #include <iostream>
  4 #include "stdlib.h"
  5 template <class T>
  6 class CNode
  7 {
  8 public:
  9     T data;
 10     CNode<T> *next;
 11 };
 12 template <class T>
 13 class CLink
 14 {
 15 public:
 16     CLink();
 17     CLink(const CNode<T> &init_data);            
 18     ~CLink();
 19     void InsertHead(const T &data);              //从头插入节点
 20     bool Insert(const int pos,const T &data );   //在pos位置之前插入data;
 21     bool Delete(const int pos);                  //删除第Pos个元素
 22     int  Get_Length()const;                      //获得链表长度
 23     bool Find_Data(const T& data)const;          //返回链表中是否存在data.
 24     bool IsEmpty() const;                        //判断链表是否为空
 25     bool SetAt(const int pos,const T& data);     //将位置pos的值设为data
 26     void Remove();                               //清空链表
 27     void Print()const;                           //打印链表中的内容
 28 protected:
 29     CNode<T> *head;
 30     int Count;                                   //记录链表中元素个数
 31 
 32 };
 33 
 34 
 35 template <class T>
 36 CLink<T>::CLink()
 37 {
 38     head = new CNode<T>;
 39     head->next=NULL;
 40     Count = 0;
 41 }
 42 template <class T>
 43 CLink<T>::~CLink()
 44 {
 45         if(head->next!=NULL)
 46         {
 47              CNode<T>* p = head;
 48              CNode<T>* q;
 49          while (p->next!=NULL)
 50          {
 51             q = p->next;
 52             p->next = q->next;
 53             delete q;
 54         }
 55     delete head;
 56 }
 57 template <class T>
 58 CLink<T>::CLink(const CNode<T> &initdata)
 59 {
 60     head = new CNode<T>;
 61     head->next = NULL;
 62     head->data =http://www.mamicode.com/ initdata;
 63     Count = 0;
 64 }
 65 template <class T>
 66 void CLink<T>::InsertHead(const T& data)
 67 {
 68     CNode<T> *newnode = new CNode<T>;
 69     newnode->data =http://www.mamicode.com/ data;
 70     newnode->next = head->next;
 71     head->next = newnode;
 72     ++Count;
 73 }
 74 template <class T>
 75 void CLink<T>::Print()const
 76 {
 77     CNode<T>* p = new CNode<T>;
 78     p = head;
 79     while(p->next)
 80     {
 81         p = p->next;
 82         std::cout<<p->data<<" ";    
 83     }
 84 }
 85 template <class T>
 86 bool CLink<T>::Insert(const int pos,const T& data)
 87 {
 88     int i=1;
 89     if (pos>Count+1||pos<1)
 90     {
 91         std::cout<<"插入位置不存在"<<std::endl;
 92         return false;
 93     }
 94     else
 95     {
 96         CNode<T>* newNode = new CNode<T>;
 97         CNode<T>* p = head->next;
 98         newNode->data =http://www.mamicode.com/ data;
 99         while(i<=Count&&i!=pos-1)
100         {
101             i++;
102             p = p->next;
103         }
104         newNode->next = p->next;
105         p->next = newNode;
106         ++Count;
107         return true;
108     }
109 }
110 template <class T>
111 bool CLink<T>::Delete(const int pos)
112 {
113     int i = 0;              //应该从0开始，注意删除首元节点
114     if (pos<1||pos>Count)
115     {
116         std::cout<<"删除元素不存在"<<std::endl;
117         return false;
118     }
119     else
120     {
121         CNode<T>* p = head;
122         CNode<T>* q;
123         while(i<=Count-1&&i!=pos-1)
124         {
125             i++;
126             p = p->next;
127         }
128         q = p->next;
129         p->next = q->next;
130         delete q;
131         --Count;
132         return true;
133     }
134 }
135 template<class T>
136 bool CLink<T>::Find_Data(const T& data)const
137 {
138     if(!Count||!(head->next))
139     {
140         return false;
141     }
142     else
143     {
144         CNode<T>* p =head->next;
145         while (p->data !=data&&p->next!=NULL)
146         {
147             p = p->next;
148         }
149         if(!p->next)
150         {
151             std::cout<<"链表中不存在数据data"<<std::endl;
152             return false;
153         }
154         else
155         {
156             std::cout<<"链表中存在数据data"<<std::endl;
157             return true;
158         }
159     }
160 }
161 template <class T>
162 bool CLink<T>::IsEmpty() const
163 {
164     if(!head||0==Count)
165     {
166         return true;
167     }
168     else
169     {
170         return false;
171     }
172 }
173 template <class T>
174 bool CLink<T>::SetAt(const int pos,const T& data)
175 {
176     int i = 0;
177     if(!head||pos<1||pos>Count)
178     {
179         return false;
180     }
181     else
182     {
183         CNode<T>* p = head;
184         while(i<=Count&&i!=pos)
185         {
186             p = p->next;
187             i++;
188         }
189         p->data =http://www.mamicode.com/ data;
190         return true;
191     }
192 
193 }
194 template <class T>
195 void CLink<T>::Remove()
196 {
197     if(!head->next)
198     {
199         std::cout<<"链表为空"<<std::endl;
200     }
201     else
202     {
203         CNode<T>* p = head;
204         CNode<T>* q;
205         while (p->next!=NULL)
206         {
207             q = p->next;
208             p->next = q->next;
209             delete q;
210         }
211         std::cout<<"链表清除成功"<<std::endl;
212     }
213 }
214 template <class T>
215 int CLink<T>::Get_Length()const
216 {
217    return Count;
218 }
219 
220 #endif//_List_H_