Related Articles

Related Articles

map emplace() in C++ STL
  • Difficulty Level : Hard
  • Last Updated : 29 Jun, 2018

The map::emplace() is a built-in function in C++ STL which inserts the key and its element in the map container. It effectively increases the container size by one. If the same key is emplaced more than once, the map stores the first element only as the map is a container which does not store multiple keys of the same value.

Syntax:

map_name.emplace(key, element)

Parameters: The function accepts two mandatory parameters which are described below:

  • key – specifies the key to be inserted in the multimap container.
  • element – specifies the element to the key which is to be inserted in the map container.

Return Value: The function does not return anything.

filter_none

edit
close

play_arrow

link
brightness_4
code

// C++ program for the illustration of
// map::emplace() function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // initialize container
    map<int, int> mp;
  
    // insert elements in random order
    mp.emplace(2, 30);
    mp.emplace(1, 40);
    mp.emplace(2, 20);
    mp.emplace(1, 50);
    mp.emplace(4, 50);
  
    // prints the elements
    cout << "\nThe map is : \n";
    cout << "KEY\tELEMENT\n";
    for (auto itr = mp.begin(); itr != mp.end(); itr++)
        cout << itr->first << "\t" << itr->second << endl;
  
    return 0;
}

chevron_right


Output:

The map is : 
KEY    ELEMENT
1    40
2    30
4    50

Attention reader! Don’t stop learning now. Get hold of all the important C++ Foundation and STL concepts with the C++ Foundation and STL courses at a student-friendly price and become industry ready.

My Personal Notes arrow_drop_up
Recommended Articles
Page :