text: //
  // local/datagram_protocol.hpp
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
  //
  // 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)
  //
  
  #ifndef BOOST_ASIO_LOCAL_DATAGRAM_PROTOCOL_HPP
  #define BOOST_ASIO_LOCAL_DATAGRAM_PROTOCOL_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include <boost/asio/detail/config.hpp>
  
  #if defined(BOOST_ASIO_HAS_LOCAL_SOCKETS) \
    || defined(GENERATING_DOCUMENTATION)
  
  #include <boost/asio/basic_datagram_socket.hpp>
  #include <boost/asio/detail/socket_types.hpp>
  #include <boost/asio/local/basic_endpoint.hpp>
  
  #include <boost/asio/detail/push_options.hpp>
  
  namespace boost {
  namespace asio {
  namespace local {
  
  /// Encapsulates the flags needed for datagram-oriented UNIX sockets.
  /**
   * The boost::asio::local::datagram_protocol class contains flags necessary for
   * datagram-oriented UNIX domain sockets.
   *
   * @par Thread Safety
   * @e Distinct @e objects: Safe.@n
   * @e Shared @e objects: Safe.
   *
   * @par Concepts:
   * Protocol.
   */
  class datagram_protocol
  {
  public:
    /// Obtain an identifier for the type of the protocol.
    int type() const
    {
      return SOCK_DGRAM;
    }
  
    /// Obtain an identifier for the protocol.
    int protocol() const
    {
      return 0;
    }
  
    /// Obtain an identifier for the protocol family.
    int family() const
    {
      return AF_UNIX;
    }
  
    /// The type of a UNIX domain endpoint.
    typedef basic_endpoint<datagram_protocol> endpoint;
  
    /// The UNIX domain socket type.
    typedef basic_datagram_socket<datagram_protocol> socket;
  };
  
  } // namespace local
  } // namespace asio
  } // namespace boost
  
  #include <boost/asio/detail/pop_options.hpp>
  
  #endif // defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
         //   || defined(GENERATING_DOCUMENTATION)
  
  #endif // BOOST_ASIO_LOCAL_DATAGRAM_PROTOCOL_HPP
  