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diff --git a/lib/asio/ip/udp.hpp b/lib/asio/ip/udp.hpp
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+//
+// ip/udp.hpp
+// ~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 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 ASIO_IP_UDP_HPP
+#define ASIO_IP_UDP_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/basic_datagram_socket.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/ip/basic_endpoint.hpp"
+#include "asio/ip/basic_resolver.hpp"
+#include "asio/ip/basic_resolver_iterator.hpp"
+#include "asio/ip/basic_resolver_query.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Encapsulates the flags needed for UDP.
+/**
+ * The asio::ip::udp class contains flags necessary for UDP sockets.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Safe.
+ *
+ * @par Concepts:
+ * Protocol, InternetProtocol.
+ */
+class udp
+{
+public:
+  /// The type of a UDP endpoint.
+  typedef basic_endpoint<udp> endpoint;
+
+  /// Construct to represent the IPv4 UDP protocol.
+  static udp v4()
+  {
+    return udp(ASIO_OS_DEF(AF_INET));
+  }
+
+  /// Construct to represent the IPv6 UDP protocol.
+  static udp v6()
+  {
+    return udp(ASIO_OS_DEF(AF_INET6));
+  }
+
+  /// Obtain an identifier for the type of the protocol.
+  int type() const
+  {
+    return ASIO_OS_DEF(SOCK_DGRAM);
+  }
+
+  /// Obtain an identifier for the protocol.
+  int protocol() const
+  {
+    return ASIO_OS_DEF(IPPROTO_UDP);
+  }
+
+  /// Obtain an identifier for the protocol family.
+  int family() const
+  {
+    return family_;
+  }
+
+  /// The UDP socket type.
+  typedef basic_datagram_socket<udp> socket;
+
+  /// The UDP resolver type.
+  typedef basic_resolver<udp> resolver;
+
+  /// Compare two protocols for equality.
+  friend bool operator==(const udp& p1, const udp& p2)
+  {
+    return p1.family_ == p2.family_;
+  }
+
+  /// Compare two protocols for inequality.
+  friend bool operator!=(const udp& p1, const udp& p2)
+  {
+    return p1.family_ != p2.family_;
+  }
+
+private:
+  // Construct with a specific family.
+  explicit udp(int protocol_family)
+    : family_(protocol_family)
+  {
+  }
+
+  int family_;
+};
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_UDP_HPP