二元谓词

 1 #include<iostream>
 2 #include<vector>
 3 #include<algorithm>
 4 
 5 using namespace std;
 6 //二元谓词
 7 class mycompare
 8 {
 9 public:
10     bool operator()(int val1, int val2)
11     {
12         return val1 > val2;
13     }
14 };
15 
16 void test1()
17 {
18     vector<int> v;
19     v.push_back(10);
20     v.push_back(20);
21     v.push_back(30);
22     v.push_back(40);
23     v.push_back(50);
24 
25     sort(v.begin(), v.end());
26     for (vector<int>::iterator it = v.begin(); it != v.end(); it++)
27     {
28         cout << *it << " ";
29     }
30     cout << endl;
31     sort(v.begin(), v.end(),mycompare());
32     for (vector<int>::iterator it = v.begin(); it != v.end(); it++)
33     {
34         cout << *it << " ";
35     }
36 }
37 
38 int main()
39 {
40 
41     test1();
42 
43     return 0;
44 }