// Example program
#include <iostream>
#include <string>
#include <vector>
#include <chrono>
using namespace std;

int main()
{
    string a = "veryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryverylongstring";
    vector<string> b(10,a);
    vector<vector<string> > c(1000,b);
    vector<string> d,e;
    
    auto t1 = chrono::system_clock::now();
    for(auto& item : c)
    {
        d.insert(d.end(),item.begin(),item.end());
    }
    cout << c[0][0].length() << endl;
    
    auto t2 = chrono::system_clock::now();
    for(auto& item:c)
    {
        e.insert(e.end(), std::make_move_iterator(item.begin()),std::make_move_iterator(item.end()));
    }
    
    auto t3 = chrono::system_clock::now();    
    cout << chrono::duration_cast<chrono::nanoseconds>(t2-t1).count() << endl;
    cout << chrono::duration_cast<chrono::nanoseconds>(t3-t2).count() << endl;
    cout << c[0][0].length() << endl;
    cout << "To check that c has been moved from." <<endl;
}