1 // constructing sets
 2 #include <iostream>
 3 #include <set>
 4 
 5 void checkin(std::set<int> & myset,int v)
 6 {
 7     if (myset.find(v) != myset.end())
 8         std::cout << "in " << std::endl;
 9     else
10         std::cout << "not" << std::endl;
11 };
12 int main()
13 {
14 
15     int myints[] = { 10, 20, 30, 40, 50 };
16     std::set<int> myset(myints, myints + 5);        // range
17 
18     checkin(myset, 10);
19     
20     myset.erase(myset.find(10));//删除元素
21     checkin(myset, 10);
22     myset.insert(10);//添加元素
23     checkin(myset, 10);
24 
25     system("pause");
26     return 0;
27 }