#include "tbb/tbb.h"
#include <iostream>
using namespace tbb;
using namespace std;

class first_task : public task { 
    public: 
    task* execute( ) { 
       cout << "Hello World!\n";
       return NULL;
    }
};

int main( )
{ 
    task_scheduler_init init(task_scheduler_init::automatic);
    first_task& f1 = *new(tbb::task::allocate_root()) first_task( );
    tbb::task::spawn_root_and_wait(f1);
    
    return 0;
}