text: //
  // timer.cpp
  // ~~~~~~~~~
  //
  // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
  //
  // Distributed under the Boost Software License, Version 1.0. (See accompanying
  // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  //
  
  #include <iostream>
  #include <boost/asio.hpp>
  
  int main()
  {
    boost::asio::io_context io;
  
    boost::asio::steady_timer t(io, boost::asio::chrono::seconds(5));
    t.wait();
  
    std::cout << "Hello, world!" << std::endl;
  
    return 0;
  }
  