1: /*
2: @@
3: Author: justinzhang
4: Email: uestczhangchao@gmail.com
5: Time: 2012-9-1 20:37:37
6: desc: double list related code
7: */
8: #include <iostream>
9: #include <cassert>
10: #include <vector>
11: using namespace std;
12:
13: template <typename type>
14: class doublelist
15: { 16: public:
17: static const int TERMINAL = 111;
18: doublelist<type>* get_next()
19: { 20: return next;
21: }
22: void set_next(doublelist<type>* ne)
23: { 24: this->next = ne;
25: }
26:
27: doublelist<type>* get_prev()
28: { 29: return prev;
30: }
31: void set_prev(doublelist<type>* prev)
32: { 33: this->prev = prev;
34: }
35:
36: type get_data()
37: { 38: return data;
39: }
40: void set_data(const type &data)
41: { 42: this->data = data;
43: }
44: doublelist<type> * create_doublelist();
45: void show_doublelist(doublelist<type> *phead);
46: doublelist<type> * create_doublelist_with_vector(vector<type> data);
47: private:
48: doublelist<type> * next;
49: doublelist<type> * prev;
50: type data;
51: };
52:
53: template<typename type> doublelist<type>* doublelist<type>:: create_doublelist()
54: { 55: doublelist<type> *phead = new doublelist<type>();
56: assert(phead);
57: phead->next = phead;
58: phead->prev = phead;
59: phead->data = TERMINAL;
60: doublelist<type> *preal_head = phead;
61:
62: type tmp_data;
63: doublelist<type> *node = NULL;
64: cout << "input list data, end with " << TERMINAL << "!" << endl;
65: while(1)
66: { 67: cin>> tmp_data;
68: if(tmp_data == TERMINAL)
69: break;
70: node = new doublelist<type>();
71: assert(node);
72: node->data = tmp_data;
73: phead->next = node;
74: node->prev = phead;
75: node->next = NULL;
76: phead = node;
77: }
78: /* the following two statements make the list become circular link list*/
79: node->next = preal_head;
80: preal_head->prev = node;
81: return preal_head;
82: }
83:
84: template <typename type> void doublelist<type>::show_doublelist(doublelist<type> *phead)
85: { 86: doublelist<type> * cur = phead;
87: /* if the cur pointer points to the head pointer, it means the end of the list;
88: you can draw a draft graph to help you understatnd it;
89: */
90: while(cur->next!=phead)
91: { 92: cur = cur->next;
93: cout << cur->data << endl;
94: }
95: }
96:
97: template <typename type> doublelist<type> * doublelist<type>::create_doublelist_with_vector(vector<type> data)
98: { 99: int i = 0;
100: doublelist<type> *ptmp_head = new doublelist<type>();
101: assert(ptmp_head);
102: ptmp_head->next = ptmp_head;
103: ptmp_head->prev = ptmp_head;
104: doublelist<type> *phead = ptmp_head;
105: doublelist<type> *node = NULL;
106: for(i = 0; i < data.size(); i++)
107: { 108: node = new doublelist<type>();
109: assert(node);
110: node->data = data[i];
111: ptmp_head->next = node;
112: node->prev = ptmp_head;
113: ptmp_head = node;
114: node->next = NULL;
115: }
116:
117: /* make it become circular doble link list */
118: phead->prev = node;
119: node->next = phead;
120: return phead;
121: }
122:
123: int main()
124: { 125: doublelist<float> dlist;
126: //doublelist<float> *dl1 = dlist.create_doublelist();
127: //dlist.show_doublelist(dl1);
128:
129: /* test create_doublelist_with_vector */
130: doublelist<int> int_dlist;
131: vector<int> vec;
132: for(int i=0; i<10; i++)
133: vec.push_back(i+1);
134: doublelist<int>* pint_dlist = int_dlist.create_doublelist_with_vector(vec);
135: int_dlist.show_doublelist(pint_dlist);
136:
137: return 0;
138: }
