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diff --git a/boost/asio/local/datagram_protocol.hpp b/boost/asio/local/datagram_protocol.hpp
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+//
+// local/datagram_protocol.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// 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)
+//
+
+#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