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diff --git a/lib/asio/ip/tcp.hpp b/lib/asio/ip/tcp.hpp
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+//
+// ip/tcp.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_TCP_HPP
+#define ASIO_IP_TCP_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_socket_acceptor.hpp"
+#include "asio/basic_socket_iostream.hpp"
+#include "asio/basic_stream_socket.hpp"
+#include "asio/detail/socket_option.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 TCP.
+/**
+ * The asio::ip::tcp class contains flags necessary for TCP sockets.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Safe.
+ *
+ * @par Concepts:
+ * Protocol, InternetProtocol.
+ */
+class tcp
+{
+public:
+  /// The type of a TCP endpoint.
+  typedef basic_endpoint<tcp> endpoint;
+
+  /// Construct to represent the IPv4 TCP protocol.
+  static tcp v4()
+  {
+    return tcp(ASIO_OS_DEF(AF_INET));
+  }
+
+  /// Construct to represent the IPv6 TCP protocol.
+  static tcp v6()
+  {
+    return tcp(ASIO_OS_DEF(AF_INET6));
+  }
+
+  /// Obtain an identifier for the type of the protocol.
+  int type() const
+  {
+    return ASIO_OS_DEF(SOCK_STREAM);
+  }
+
+  /// Obtain an identifier for the protocol.
+  int protocol() const
+  {
+    return ASIO_OS_DEF(IPPROTO_TCP);
+  }
+
+  /// Obtain an identifier for the protocol family.
+  int family() const
+  {
+    return family_;
+  }
+
+  /// The TCP socket type.
+  typedef basic_stream_socket<tcp> socket;
+
+  /// The TCP acceptor type.
+  typedef basic_socket_acceptor<tcp> acceptor;
+
+  /// The TCP resolver type.
+  typedef basic_resolver<tcp> resolver;
+
+#if !defined(ASIO_NO_IOSTREAM)
+  /// The TCP iostream type.
+  typedef basic_socket_iostream<tcp> iostream;
+#endif // !defined(ASIO_NO_IOSTREAM)
+
+  /// Socket option for disabling the Nagle algorithm.
+  /**
+   * Implements the IPPROTO_TCP/TCP_NODELAY socket option.
+   *
+   * @par Examples
+   * Setting the option:
+   * @code
+   * asio::ip::tcp::socket socket(io_context); 
+   * ...
+   * asio::ip::tcp::no_delay option(true);
+   * socket.set_option(option);
+   * @endcode
+   *
+   * @par
+   * Getting the current option value:
+   * @code
+   * asio::ip::tcp::socket socket(io_context); 
+   * ...
+   * asio::ip::tcp::no_delay option;
+   * socket.get_option(option);
+   * bool is_set = option.value();
+   * @endcode
+   *
+   * @par Concepts:
+   * Socket_Option, Boolean_Socket_Option.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined no_delay;
+#else
+  typedef asio::detail::socket_option::boolean<
+    ASIO_OS_DEF(IPPROTO_TCP), ASIO_OS_DEF(TCP_NODELAY)> no_delay;
+#endif
+
+  /// Compare two protocols for equality.
+  friend bool operator==(const tcp& p1, const tcp& p2)
+  {
+    return p1.family_ == p2.family_;
+  }
+
+  /// Compare two protocols for inequality.
+  friend bool operator!=(const tcp& p1, const tcp& p2)
+  {
+    return p1.family_ != p2.family_;
+  }
+
+private:
+  // Construct with a specific family.
+  explicit tcp(int protocol_family)
+    : family_(protocol_family)
+  {
+  }
+
+  int family_;
+};
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IP_TCP_HPP