C++ Vector emplace() function

C++ Vector emplace() function tutorial for beginners and professionals with examples on assign(), at(), back(), begin(), capacity(), cbegin(), cend(), clear(), crbegin(), crend(), data(), emplace(), end(), front(), rbegin(), resize(), size(), swap() etc.

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C++ Vector emplace()

This function inserts a new element just before the position pos and size of the vector container increases.

Syntax

Consider a vector 'v'. Syntax would be:

Iterator it=v.emplace(pos,args);

Parameter

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

args: Arguments forwarded to construct the new element.

Return value

It returns an iterator to the newly inserted element.

Example 1

Let's see a simple example.

#include <iostream>
#include<vector>
using namespace std;
int main()
{
vector<int> v{1,2,3,4,5};
cout<<"Elements of vector v are :";
for(int i=0;i<v.size();i++)
cout<<v[i]<<" ";
cout<<'\n';
cout<<"After adding two elements, elements are :";
vector<int>::iterator it=v.emplace(v.begin()+2,8);
v.emplace(it,9);
for(int i=0;i<v.size();i++)
cout<<v[i]<<" ";
return 0;
}

Output:

Elements of vector v are :1 2 3 4 5
After adding two elements, elements are :1 2 9 8 3 4 5

In this example, size of the vector container increases using emplace() function.

Example 2

Let's see a simpleanother example.

#include <iostream>
#include<vector>
using namespace std;
int main()
{
vector<string> v{"mango","apple","banana"};
v.emplace(v.begin()+2,"strawberry");
for(int i=0;i<v.size();i++)
std::cout<< v[i] << " ";
return 0;
}

Output:

Mango apple strawberry banana

In this example, the size of the vector container increases by adding new string into the vector using emplace() function.

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