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multiset max_size() in C++ STL with Examples

Last Updated : 11 Jul, 2025
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The multiset::max_size() is a built-in function in C++ STL which returns the maximum number of elements a multiset container can hold. Syntax: 
multiset_name.max_size()
Parameters: The function does not accept any parameters. Return Value: The function returns the maximum number of elements a multiset container can hold. Below programs illustrate the above function: Program 1: CPP 
// CPP program to demonstrate the
// multiset::max_size() function
// when multiset is non-empty
#include <bits/stdc++.h>
using namespace std;
int main()
{

    multiset<int> s;

    // Function to insert elements
    // in the multiset container
    s.insert(10);
    s.insert(13);
    s.insert(13);
    s.insert(25);
    s.insert(24);

    cout << "The multiset elements are: ";
    for (auto it = s.begin(); it != s.end(); it++)
        cout << *it << " ";

    cout << "\nThe max size of multiset: " << s.max_size();
    return 0;
}
Output: 
The multiset elements are: 10 13 13 24 25 
The max size of multiset: 461168601842738790
Program 2: CPP 
// CPP program to demonstrate the
// multiset::max_size() function
// when multiset is empty
#include <bits/stdc++.h>
using namespace std;
int main()
{

    multiset<int> s;

    cout << "\nThe max size of multiset: " << s.max_size();
    return 0;
}
Output: 
The max size of multiset: 461168601842738790
All functions of multiset

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