#ifdef __has_include
#if __has_include(<tbb/tbb.h>)

#include <iostream>
#include <tbb/tbb.h>
#include <thread>

using namespace std::chrono_literals;

void function(int id)
{
    for (int i = 0; i < 3; ++i)
    {
        std::cout << id << ": hello!\n";
        // std::this_thread::yield(); // does it work?
        std::this_thread::sleep_for(250ms);
    }
}

struct object
{
    int id;

    object(int id): id(id) {}

    void operator()() const
    {
        for (int i = 0; i < 3; ++i)
        {
            std::cout << id << ": hello!\n";
            // std::this_thread::yield(); // does it work?
            std::this_thread::sleep_for(250ms);
        }
    }
};

void test1()
{
    tbb::parallel_invoke([] { function(1); }, object(2));
}

void test2()
{
    tbb::task_group group;
    group.run([] { function(1); }); // spawn 1st task and return
    group.run(object(2));           // spawn 2st task and return
    group.wait();                   // wait for tasks to complete
}

void test3()
{
    tbb::task_arena arena(2);       // create arena with 2 threads
    arena.execute([] { test1(); }); // spawn task in arena
}

int main()
{
    test1();
    std::cout << "---------------------\n";
    test2();
    std::cout << "---------------------\n";
    test3();
}

#else

#warning "Deberías instalar TBB!!!"
int main() {}

#endif // __has_include
#endif // __has_include(<tbb/tbb.h>)