template <class... Args>

void emplace_back (Args&&... args);

#include <iostream>

#include <vector>

using namespace std;

int main ( )

{

vector<int> myvector={10,20,30};

myvector.emplace_back(100);

myvector.emplace_back(200);

cout<<"myvector contains:";

for(auto& x: myvector)

cout<<' '<<x;

cout<<'\n';

return 0;

}