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unordered_multiset emplace() function in C++ STL

Last Updated : 02 Aug, 2018

The

is a built-in function in C++ STL which inserts a new element in the unordered_multiset container. The insertion is done automatically at the position according to the container's criterion. It increases the size of the container by one.

unordered_multiset_name.emplace(val)

The function accepts a single mandatory parameter

which is to be inserted in the container.

It returns an iterator which points to the newly inserted element. Below programs illustrates the above function:

// C++ program to illustrate the
// unordered_multiset::emplace() function
#include <bits/stdc++.h>
using namespace std;

int main()
{

    // declaration
    unordered_multiset<int> sample;

    // inserts element using emplace()
    sample.emplace(11);
    sample.emplace(11);
    sample.emplace(11);
    sample.emplace(12);
    sample.emplace(13);
    sample.emplace(13);
    sample.emplace(14);

    cout << "Elements: ";

    for (auto it = sample.begin(); it != sample.end(); it++)
        cout << *it << " ";
    return 0;
}

Elements: 14 11 11 11 12 13 13

// C++ program to illustrate the
// unordered_multiset::emplace() function
#include <bits/stdc++.h>
using namespace std;

int main()
{

    // declaration
    unordered_multiset<char> sample;

    // inserts element using emplace()
    sample.emplace('a');
    sample.emplace('a');
    sample.emplace('a');
    sample.emplace('b');
    sample.emplace('b');
    sample.emplace('c');
    sample.emplace('d');

    cout << "Elements: ";

    for (auto it = sample.begin(); it != sample.end(); it++)
        cout << *it << " ";
    return 0;
}

Elements: d a a a b b c

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