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#### Source listing for Daytime.4

    //
    // client.cpp
    // ~~~~~~~~~~
    //
    // Copyright (c) 2003-2015 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/array.hpp>
    #include <boost/asio.hpp>

    using boost::asio::ip::udp;

    int main(int argc, char* argv[])
    {
      try
      {
        if (argc != 2)
        {
          std::cerr << "Usage: client <host>" << std::endl;
          return 1;
        }

        boost::asio::io_service io_service;

        udp::resolver resolver(io_service);
        udp::resolver::query query(udp::v4(), argv[1], "daytime");
        udp::endpoint receiver_endpoint = *resolver.resolve(query);

        udp::socket socket(io_service);
        socket.open(udp::v4());

        boost::array<char, 1> send_buf  = {{ 0 }};
        socket.send_to(boost::asio::buffer(send_buf), receiver_endpoint);

        boost::array<char, 128> recv_buf;
        udp::endpoint sender_endpoint;
        size_t len = socket.receive_from(
            boost::asio::buffer(recv_buf), sender_endpoint);

        std::cout.write(recv_buf.data(), len);
      }
      catch (std::exception& e)
      {
        std::cerr << e.what() << std::endl;
      }

      return 0;
    }

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