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diff --git a/lib/asio/ip/detail/endpoint.hpp b/lib/asio/ip/detail/endpoint.hpp
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+//
+// ip/detail/endpoint.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_DETAIL_ENDPOINT_HPP
+#define ASIO_IP_DETAIL_ENDPOINT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include <string>
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/winsock_init.hpp"
+#include "asio/error_code.hpp"
+#include "asio/ip/address.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ip {
+namespace detail {
+
+// Helper class for implementating an IP endpoint.
+class endpoint
+{
+public:
+  // Default constructor.
+  ASIO_DECL endpoint();
+
+  // Construct an endpoint using a family and port number.
+  ASIO_DECL endpoint(int family, unsigned short port_num);
+
+  // Construct an endpoint using an address and port number.
+  ASIO_DECL endpoint(const asio::ip::address& addr,
+      unsigned short port_num);
+
+  // Copy constructor.
+  endpoint(const endpoint& other)
+    : data_(other.data_)
+  {
+  }
+
+  // Assign from another endpoint.
+  endpoint& operator=(const endpoint& other)
+  {
+    data_ = other.data_;
+    return *this;
+  }
+
+  // Get the underlying endpoint in the native type.
+  asio::detail::socket_addr_type* data()
+  {
+    return &data_.base;
+  }
+
+  // Get the underlying endpoint in the native type.
+  const asio::detail::socket_addr_type* data() const
+  {
+    return &data_.base;
+  }
+
+  // Get the underlying size of the endpoint in the native type.
+  std::size_t size() const
+  {
+    if (is_v4())
+      return sizeof(asio::detail::sockaddr_in4_type);
+    else
+      return sizeof(asio::detail::sockaddr_in6_type);
+  }
+
+  // Set the underlying size of the endpoint in the native type.
+  ASIO_DECL void resize(std::size_t new_size);
+
+  // Get the capacity of the endpoint in the native type.
+  std::size_t capacity() const
+  {
+    return sizeof(data_);
+  }
+
+  // Get the port associated with the endpoint.
+  ASIO_DECL unsigned short port() const;
+
+  // Set the port associated with the endpoint.
+  ASIO_DECL void port(unsigned short port_num);
+
+  // Get the IP address associated with the endpoint.
+  ASIO_DECL asio::ip::address address() const;
+
+  // Set the IP address associated with the endpoint.
+  ASIO_DECL void address(const asio::ip::address& addr);
+
+  // Compare two endpoints for equality.
+  ASIO_DECL friend bool operator==(
+      const endpoint& e1, const endpoint& e2);
+
+  // Compare endpoints for ordering.
+  ASIO_DECL friend bool operator<(
+      const endpoint& e1, const endpoint& e2);
+
+  // Determine whether the endpoint is IPv4.
+  bool is_v4() const
+  {
+    return data_.base.sa_family == ASIO_OS_DEF(AF_INET);
+  }
+
+#if !defined(ASIO_NO_IOSTREAM)
+  // Convert to a string.
+  ASIO_DECL std::string to_string() const;
+#endif // !defined(ASIO_NO_IOSTREAM)
+
+private:
+  // The underlying IP socket address.
+  union data_union
+  {
+    asio::detail::socket_addr_type base;
+    asio::detail::sockaddr_in4_type v4;
+    asio::detail::sockaddr_in6_type v6;
+  } data_;
+};
+
+} // namespace detail
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/ip/detail/impl/endpoint.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_IP_DETAIL_ENDPOINT_HPP