单链表sLinkList类，模板类

  1 /*
  2     该文件按习惯可以分成.h文件和实现的.cpp文件
  3  */
  4 template <class elemType>
  5 class sLinkList
  6 {
  7 private:
  8     struct node{ //定义单链表中的结点结构
  9         elemType data;
 10         node *next;
 11 
 12         node(const elemType &x, node *n = NULL)
 13         {
 14             data = x; next = n;;
 15         }
 16         node() :next(NULL) {}
 17         ~node() {}
 18     };
 19     
 20     node  *head;//头指针
 21     int currentLength;//表长
 22 
 23     //node *move(int i)const;//返回第i个结点的地址
 24     node *move(int i)const
 25     {
 26         node *p = head;
 27         while( i-- >= 0 )
 28         {
 29             p = p->next;
 30         }
 31         return p;
 32     } 
 33 
 34 public:
 35     sLinkList();
 36     ~sLinkList() {
 37         clear(); delete head;
 38     }
 39 
 40     void clear();
 41     int length()const {
 42         return currentLength;
 43     }
 44     void insert(int i, const elemType&x);
 45     void remove(int i);
 46     int search(const elemType&x)const;
 47     elemType visit(int i)const;
 48     void traverse()const;
 49 };
 50 
 51 // sLinkList
 52 template <class elemType>
 53 sLinkList<elemType> ::sLinkList()
 54 {
 55     head = new node;
 56     currentLength = 0;
 57 }
 58 
 59 // clear
 60 template <class elemType>
 61 void sLinkList<elemType> ::clear()
 62 {
 63     node *p = head->next, *q;
 64     head->next = NULL;
 65     while(p!=NULL)
 66     {
 67         q = p->next;
 68         delete p;
 69         p = q;
 70     }
 71     currentLength = 0;
 72 }
 73 
 74 // insert
 75 template <class elemType>
 76 void sLinkList<elemType> ::insert(int i, const elemType&x)
 77 {
 78     node *pos;
 79     pos = move(i-1);
 80     pos->next = new node(x, pos->next);
 81     ++currentLength;
 82 }
 83 
 84 /* // 类外实现,编译器编译不过,只好类内实现
 85 // move
 86 template <class elemType>
 87 sLinkList<elemType>::node *sLinkList<elemType> :: move(int i)const
 88 {
 89     node *p = head;
 90     while( i-- >= 0 )
 91     {
 92         p = p->next;
 93     }
 94     return p;
 95 }  */
 96 
 97 // search
 98 template <class elemType>
 99 int sLinkList<elemType> :: search(const elemType&x)const
100 {
101     node *p = head->next;
102     int i=0;
103     while( p != NULL && p->data != x )
104     {
105         p = p->next;
106         ++i;
107     }
108     
109     if(p == NULL)
110         return -1;
111     else
112         return i;
113 }    
114 
115 // visit
116 template <class elemType>
117 elemType sLinkList<elemType> :: visit(int i)const
118 {
119     return move(i)->data;
120 }    
121 
122 // traverse
123 template <class elemType>
124 void sLinkList<elemType> :: traverse()const
125 {
126     node *p = head->next;
127     cout<<endl;
128     
129     while( p != NULL )
130     {
131         cout<<p->data<<" ";
132         p = p->next;
133     }
134     
135     cout<<endl;
136 }    
137 
138 // remove
139 template <class elemType>
140 void sLinkList<elemType> :: remove(int i)
141 {
142     node *pos, *delp;
143     pos = move(i-1);
144     delp = pos->next;
145     
146     pos->next = delp->next;
147     delete delp;
148     
149     --currentLength;
150 }