15.map映射

 1 #include <iostream>
 2 #include <map>
 3 #include <cstring>
 4 using namespace std;
 5 
 6 //map常规用法
 7 void main1()
 8 {
 9     //映射
10     map<char *, int> mymap;
11     mymap.insert(pair<char *, int>("司令6", 16));
12     mymap.insert(pair<char *, int>("司令2", 11));
13     mymap.insert(pair<char *, int>("司令3", 12));
14     mymap.insert(pair<char *, int>("司令4", 13));
15     //第一个字段不允许重复
16     mymap.insert(pair<char *, int>("司令4", 1323));
17 
18     for (auto i : mymap)
19     {
20         cout << i.first << "  " << i.second << endl;
21     }
22 
23     for (auto cb = mymap.cbegin(), ce = mymap.cend(); cb != ce; cb++)
24     {
25         cout << (*cb).first << "  " << (*cb).second << endl;
26     }
27 
28     auto it = mymap.find("司令2");
29     //删除一个
30     //mymap.erase(it);
31     //删除一段
32     //mymap.erase(it, mymap.end());
33     //链式存储
34     //auto ifind = mymap.begin()++;
35     //cout << mymap["司令2"] << endl;
36     //清空
37     mymap.clear();
38     cout << it->first << "  " << it->second << endl;
39     cin.get();
40 }
41 
42 struct strless
43 {
44     //仿函数
45     bool operator()(const char *str1, const char *str2)
46     {
47         //字符串比较
48         return (strcmp(str1, str2) < 0);
49     }
50 };
51 
52 void main()
53 {
54     //根据strless进行排序插入
55     map<char *, int, strless> mymap;
56     mymap.insert(pair<char *, int>("司令6", 16));
57     mymap.insert(pair<char *, int>("司令2", 11));
58     mymap.insert(pair<char *, int>("司令3", 12));
59     mymap.insert(pair<char *, int>("司令4", 13));
60     
61     
62 
63     for (auto i : mymap)
64     {
65         cout << i.first << "  " << i.second << endl;
66     }
67 
68     
69     cin.get();
70 }