/******************************************************************************
 
                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.
 
*******************************************************************************/
 
#include <iostream>
#include <thread>
#include <future>
#include <chrono>
 
using namespace std;
 
void foo(int var)
{
    std::this_thread::sleep_for(std::chrono::milliseconds(5000));
    cout<<var<<endl;
}
 
int main()
{
 
 
    future<void> fn = async(launch::async,foo, 2);
    cout<<"Hello World"<<endl;
    cout<<"Hello World"<<endl;
    fn.get();
    cout<<"Hello World"<<endl;
    cout<<"Hello World"<<endl;
    cout<<"Hello world"<<endl;
 
 
    return 0;
}

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