【工作中学习2】Map的使用及排序（第三个参数）

 1 // testMap.cpp : Defines the entry point for the console application.
 2 //
 3 
 4 #include "stdafx.h"
 5 #include <string>
 6 #include <map>
 7 #include <iostream>
 8 
 9 struct SortMap  
10 {
11     bool operator ()( const int i1, const int i2 )  
12     {  
13         return i1 > i2;  
14     }  
15 };
16 
17 //traverse the map
18 void traverseMap(const std::map<int, std::string>& map)
19 {
20     std::map<int, std::string>::const_iterator iter = map.begin();
21     
22     while(iter != map.end())
23     {
24         std::cout << "" << iter->first << "," << iter->second << std::endl;
25         iter++;
26      }
27 }
28 
29 void traverseSortMap(const std::map<int, std::string, SortMap>& map)
30 {
31     std::map<int, std::string, SortMap>::const_iterator iter = map.begin();
32 
33     while(iter != map.end())
34     {
35         std::cout << "" << iter->first << "," << iter->second << std::endl;
36         iter++;
37     }
38 }
39 
40 
41 int _tmain(int argc, _TCHAR* argv[])
42 {
43     std::map<int, std::string> map1;
44     map1[1] = "no";
45     map1[6] = "hi";
46     map1[5] = "me";
47     map1[9] = "ok";
48     
49     traverseMap(map1);
50     std::cout << "-------------------------------------------" << std::endl;
51     
52     std::map<int, std::string, SortMap> map2;
53     map2[1] = "no";
54     map2[6] = "hi";
55     map2[5] = "me";
56     map2[9] = "ok";
57     
58     traverseSortMap(map2);
59     
60     system("pause");
61     return 0;
62 }