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#### Source listing for Timer.2

    //
    // timer.cpp
    // ~~~~~~~~~
    //
    // Copyright (c) 2003-2012 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>
    #include <boost/date_time/posix_time/posix_time.hpp>

    void print(const boost::system::error_code& /*e*/)
    {
      std::cout << "Hello, world!\n";
    }

    int main()
    {
      boost::asio::io_service io;

      boost::asio::deadline_timer t(io, boost::posix_time::seconds(5));
      t.async_wait(&print);

      io.run();

      return 0;
    }

Return to Timer.2 - Using a timer asynchronously