The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference, 2nd Edition
by Nicolai M. Josuttis, Addison Wesley Longman, 2012
Copyright © 2012 by Pearson Education, Inc. and Nicolai M. Josuttis
#include <unordered_set>
#include <iostream>
int main()
{
// unordered multiset container for int values
std::unordered_multiset<int> coll;
// insert some elements
coll.insert({1,3,5,7,11,13,17,19,23,27,1});
// print all elements
for (auto elem : coll) {
std::cout << elem << ' ';
}
std::cout << std::endl;
// insert one more element
coll.insert(25);
// print all elements again
for (auto elem : coll) {
std::cout << elem << ' ';
}
std::cout << std::endl;
}