{

std::cout << "Handler " << id << " executed on thread "

<< std::this_thread::get_id() << "\n";

{

boost::asio::io_context io_context;

boost::asio::strand<boost::asio::io_context::executor_type> strand(io_context.get_executor());

for (int i = 0; i < 5; ++i)

{

boost::asio::post(strand, [i]()

{ print_handler(i); });

}

std::cout << "post handlers";

std::thread t1([&]()

{ io_context.run(); });

std::thread t2([&]()

{ io_context.run(); });

t1.join();

t2.join();

return 0;