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diff --git a/lib/asio/ip/address.hpp b/lib/asio/ip/address.hpp
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+//
+// ip/address.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_ADDRESS_HPP
+#define ASIO_IP_ADDRESS_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/throw_exception.hpp"
+#include "asio/detail/string_view.hpp"
+#include "asio/detail/type_traits.hpp"
+#include "asio/error_code.hpp"
+#include "asio/ip/address_v4.hpp"
+#include "asio/ip/address_v6.hpp"
+#include "asio/ip/bad_address_cast.hpp"
+
+#if !defined(ASIO_NO_IOSTREAM)
+# include <iosfwd>
+#endif // !defined(ASIO_NO_IOSTREAM)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Implements version-independent IP addresses.
+/**
+ * The asio::ip::address class provides the ability to use either IP
+ * version 4 or version 6 addresses.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+class address
+{
+public:
+  /// Default constructor.
+  ASIO_DECL address();
+
+  /// Construct an address from an IPv4 address.
+  ASIO_DECL address(const asio::ip::address_v4& ipv4_address);
+
+  /// Construct an address from an IPv6 address.
+  ASIO_DECL address(const asio::ip::address_v6& ipv6_address);
+
+  /// Copy constructor.
+  ASIO_DECL address(const address& other);
+
+#if defined(ASIO_HAS_MOVE)
+  /// Move constructor.
+  ASIO_DECL address(address&& other);
+#endif // defined(ASIO_HAS_MOVE)
+
+  /// Assign from another address.
+  ASIO_DECL address& operator=(const address& other);
+
+#if defined(ASIO_HAS_MOVE)
+  /// Move-assign from another address.
+  ASIO_DECL address& operator=(address&& other);
+#endif // defined(ASIO_HAS_MOVE)
+
+  /// Assign from an IPv4 address.
+  ASIO_DECL address& operator=(
+      const asio::ip::address_v4& ipv4_address);
+
+  /// Assign from an IPv6 address.
+  ASIO_DECL address& operator=(
+      const asio::ip::address_v6& ipv6_address);
+
+  /// Get whether the address is an IP version 4 address.
+  bool is_v4() const
+  {
+    return type_ == ipv4;
+  }
+
+  /// Get whether the address is an IP version 6 address.
+  bool is_v6() const
+  {
+    return type_ == ipv6;
+  }
+
+  /// Get the address as an IP version 4 address.
+  ASIO_DECL asio::ip::address_v4 to_v4() const;
+
+  /// Get the address as an IP version 6 address.
+  ASIO_DECL asio::ip::address_v6 to_v6() const;
+
+  /// Get the address as a string.
+  ASIO_DECL std::string to_string() const;
+
+#if !defined(ASIO_NO_DEPRECATED)
+  /// (Deprecated: Use other overload.) Get the address as a string.
+  ASIO_DECL std::string to_string(asio::error_code& ec) const;
+
+  /// (Deprecated: Use make_address().) Create an address from an IPv4 address
+  /// string in dotted decimal form, or from an IPv6 address in hexadecimal
+  /// notation.
+  static address from_string(const char* str);
+
+  /// (Deprecated: Use make_address().) Create an address from an IPv4 address
+  /// string in dotted decimal form, or from an IPv6 address in hexadecimal
+  /// notation.
+  static address from_string(const char* str, asio::error_code& ec);
+
+  /// (Deprecated: Use make_address().) Create an address from an IPv4 address
+  /// string in dotted decimal form, or from an IPv6 address in hexadecimal
+  /// notation.
+  static address from_string(const std::string& str);
+
+  /// (Deprecated: Use make_address().) Create an address from an IPv4 address
+  /// string in dotted decimal form, or from an IPv6 address in hexadecimal
+  /// notation.
+  static address from_string(
+      const std::string& str, asio::error_code& ec);
+#endif // !defined(ASIO_NO_DEPRECATED)
+
+  /// Determine whether the address is a loopback address.
+  ASIO_DECL bool is_loopback() const;
+
+  /// Determine whether the address is unspecified.
+  ASIO_DECL bool is_unspecified() const;
+
+  /// Determine whether the address is a multicast address.
+  ASIO_DECL bool is_multicast() const;
+
+  /// Compare two addresses for equality.
+  ASIO_DECL friend bool operator==(const address& a1, const address& a2);
+
+  /// Compare two addresses for inequality.
+  friend bool operator!=(const address& a1, const address& a2)
+  {
+    return !(a1 == a2);
+  }
+
+  /// Compare addresses for ordering.
+  ASIO_DECL friend bool operator<(const address& a1, const address& a2);
+
+  /// Compare addresses for ordering.
+  friend bool operator>(const address& a1, const address& a2)
+  {
+    return a2 < a1;
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator<=(const address& a1, const address& a2)
+  {
+    return !(a2 < a1);
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator>=(const address& a1, const address& a2)
+  {
+    return !(a1 < a2);
+  }
+
+private:
+  // The type of the address.
+  enum { ipv4, ipv6 } type_;
+
+  // The underlying IPv4 address.
+  asio::ip::address_v4 ipv4_address_;
+
+  // The underlying IPv6 address.
+  asio::ip::address_v6 ipv6_address_;
+};
+
+/// Create an address from an IPv4 address string in dotted decimal form,
+/// or from an IPv6 address in hexadecimal notation.
+/**
+ * @relates address
+ */
+ASIO_DECL address make_address(const char* str);
+
+/// Create an address from an IPv4 address string in dotted decimal form,
+/// or from an IPv6 address in hexadecimal notation.
+/**
+ * @relates address
+ */
+ASIO_DECL address make_address(
+    const char* str, asio::error_code& ec);
+
+/// Create an address from an IPv4 address string in dotted decimal form,
+/// or from an IPv6 address in hexadecimal notation.
+/**
+ * @relates address
+ */
+ASIO_DECL address make_address(const std::string& str);
+
+/// Create an address from an IPv4 address string in dotted decimal form,
+/// or from an IPv6 address in hexadecimal notation.
+/**
+ * @relates address
+ */
+ASIO_DECL address make_address(
+    const std::string& str, asio::error_code& ec);
+
+#if defined(ASIO_HAS_STRING_VIEW) \
+  || defined(GENERATING_DOCUMENTATION)
+
+/// Create an address from an IPv4 address string in dotted decimal form,
+/// or from an IPv6 address in hexadecimal notation.
+/**
+ * @relates address
+ */
+ASIO_DECL address make_address(string_view str);
+
+/// Create an address from an IPv4 address string in dotted decimal form,
+/// or from an IPv6 address in hexadecimal notation.
+/**
+ * @relates address
+ */
+ASIO_DECL address make_address(
+    string_view str, asio::error_code& ec);
+
+#endif // defined(ASIO_HAS_STRING_VIEW)
+       //  || defined(GENERATING_DOCUMENTATION)
+
+#if !defined(ASIO_NO_IOSTREAM)
+
+/// Output an address as a string.
+/**
+ * Used to output a human-readable string for a specified address.
+ *
+ * @param os The output stream to which the string will be written.
+ *
+ * @param addr The address to be written.
+ *
+ * @return The output stream.
+ *
+ * @relates asio::ip::address
+ */
+template <typename Elem, typename Traits>
+std::basic_ostream<Elem, Traits>& operator<<(
+    std::basic_ostream<Elem, Traits>& os, const address& addr);
+
+#endif // !defined(ASIO_NO_IOSTREAM)
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/ip/impl/address.hpp"
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/ip/impl/address.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_IP_ADDRESS_HPP