C++ List emplace()

C++ List emplace() function inserts new element at a specified position and the size of the list is increased by one.

Syntax

Parameter

pos: It defines the position where the new element is to be inserted.

val: New value to be inserted at a specified position.

Return value

It returns an iterator pointing to the newly constructed element.

Example 1

Let's see a simple example when the new element is inserted in between the list.

#include <iostream>
#include<list>
using namespace std;
int main()
{
  list<char> li={'j','v','a'};
  list<char>::iterator itr=li.begin();
  ++itr;
  li.emplace(itr,'a');
  for(itr=li.begin();itr!=li.end();++itr)
  cout<<*itr;
  return 0;
}

Output:

java

In this example, emplace() function adds a new character at second position

Example 2

Let's see a simple example when the new element is added at the end of the list.

#include <iostream>
#include<list>
using namespace std;
int main()
{
  list<string> li={"java","is","a"};
  list<string>::iterator itr;
  li.emplace(li.end(),"programming language");
 for(itr=li.begin();itr!=li.end();++itr)
  cout<<*itr<<" ";
  return 0;
 
}

Output: