text: //
  // main.cpp
  // ~~~~~~~~
  //
  // Copyright (c) 2003-2016 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 <string>
  #include <asio.hpp>
  #include <boost/bind.hpp>
  #include <boost/lexical_cast.hpp>
  #include "server.hpp"
  
  int main(int argc, char* argv[])
  {
    try
    {
      // Check command line arguments.
      if (argc != 5)
      {
        std::cerr << "Usage: http_server <address> <port> <threads> <doc_root>\n";
        std::cerr << "  For IPv4, try:\n";
        std::cerr << "    receiver 0.0.0.0 80 1 .\n";
        std::cerr << "  For IPv6, try:\n";
        std::cerr << "    receiver 0::0 80 1 .\n";
        return 1;
      }
  
      // Initialise the server.
      std::size_t num_threads = boost::lexical_cast<std::size_t>(argv[3]);
      http::server2::server s(argv[1], argv[2], argv[4], num_threads);
  
      // Run the server until stopped.
      s.run();
    }
    catch (std::exception& e)
    {
      std::cerr << "exception: " << e.what() << "\n";
    }
  
    return 0;
  }
  