Multiset Upper Bound in C++ STL with Examples

In this tutorial, we will be discussing a program to understand multiset upper_bound() in C++ STL.

The function upper_bound() returns the pointer to an element which is bigger than the one provided as a parameter, else it returns the pointer to the last element in the container.

Example

 Live Demo

#include <bits/stdc++.h>
using namespace std;
int main(){
   multiset<int> s;
   s.insert(1);
   s.insert(3);
   s.insert(3);
   s.insert(5);
   s.insert(4);
   cout << "The multiset elements are: ";
   for (auto it = s.begin(); it != s.end(); it++)
      cout << *it << " ";
   auto it = s.upper_bound(3);
   cout << "\nThe upper bound of key 3 is ";
   cout << (*it) << endl;
   it = s.upper_bound(2);
   cout << "The upper bound of key 2 is ";
   cout << (*it) << endl;
   it = s.upper_bound(10);
   cout << "The upper bound of key 10 is ";
   cout << (*it) << endl;
   return 0;
}

Output

The multiset elements are: 1 3 3 4 5
The upper bound of key 3 is 4
The upper bound of key 2 is 3
The upper bound of key 10 is 5