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diff --git a/lib/asio/ip/address_v6.hpp b/lib/asio/ip/address_v6.hpp
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+//
+// ip/address_v6.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_V6_HPP
+#define ASIO_IP_ADDRESS_V6_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/array.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/string_view.hpp"
+#include "asio/detail/winsock_init.hpp"
+#include "asio/error_code.hpp"
+#include "asio/ip/address_v4.hpp"
+
+#if !defined(ASIO_NO_IOSTREAM)
+# include <iosfwd>
+#endif // !defined(ASIO_NO_IOSTREAM)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ip {
+
+template <typename> class basic_address_iterator;
+
+/// Implements IP version 6 style addresses.
+/**
+ * The asio::ip::address_v6 class provides the ability to use and
+ * manipulate IP version 6 addresses.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+class address_v6
+{
+public:
+  /// The type used to represent an address as an array of bytes.
+  /**
+   * @note This type is defined in terms of the C++0x template @c std::array
+   * when it is available. Otherwise, it uses @c boost:array.
+   */
+#if defined(GENERATING_DOCUMENTATION)
+  typedef array<unsigned char, 16> bytes_type;
+#else
+  typedef asio::detail::array<unsigned char, 16> bytes_type;
+#endif
+
+  /// Default constructor.
+  ASIO_DECL address_v6();
+
+  /// Construct an address from raw bytes and scope ID.
+  ASIO_DECL explicit address_v6(const bytes_type& bytes,
+      unsigned long scope_id = 0);
+
+  /// Copy constructor.
+  ASIO_DECL address_v6(const address_v6& other);
+
+#if defined(ASIO_HAS_MOVE)
+  /// Move constructor.
+  ASIO_DECL address_v6(address_v6&& other);
+#endif // defined(ASIO_HAS_MOVE)
+
+  /// Assign from another address.
+  ASIO_DECL address_v6& operator=(const address_v6& other);
+
+#if defined(ASIO_HAS_MOVE)
+  /// Move-assign from another address.
+  ASIO_DECL address_v6& operator=(address_v6&& other);
+#endif // defined(ASIO_HAS_MOVE)
+
+  /// The scope ID of the address.
+  /**
+   * Returns the scope ID associated with the IPv6 address.
+   */
+  unsigned long scope_id() const
+  {
+    return scope_id_;
+  }
+
+  /// The scope ID of the address.
+  /**
+   * Modifies the scope ID associated with the IPv6 address.
+   */
+  void scope_id(unsigned long id)
+  {
+    scope_id_ = id;
+  }
+
+  /// Get the address in bytes, in network byte order.
+  ASIO_DECL bytes_type to_bytes() 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_v6().) Create an IPv6 address from an IP
+  /// address string.
+  static address_v6 from_string(const char* str);
+
+  /// (Deprecated: Use make_address_v6().) Create an IPv6 address from an IP
+  /// address string.
+  static address_v6 from_string(
+      const char* str, asio::error_code& ec);
+
+  /// (Deprecated: Use make_address_v6().) Create an IPv6 address from an IP
+  /// address string.
+  static address_v6 from_string(const std::string& str);
+
+  /// (Deprecated: Use make_address_v6().) Create an IPv6 address from an IP
+  /// address string.
+  static address_v6 from_string(
+      const std::string& str, asio::error_code& ec);
+
+  /// (Deprecated: Use make_address_v4().) Converts an IPv4-mapped or
+  /// IPv4-compatible address to an IPv4 address.
+  ASIO_DECL address_v4 to_v4() const;
+#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 link local.
+  ASIO_DECL bool is_link_local() const;
+
+  /// Determine whether the address is site local.
+  ASIO_DECL bool is_site_local() const;
+
+  /// Determine whether the address is a mapped IPv4 address.
+  ASIO_DECL bool is_v4_mapped() const;
+
+#if !defined(ASIO_NO_DEPRECATED)
+  /// (Deprecated: No replacement.) Determine whether the address is an
+  /// IPv4-compatible address.
+  ASIO_DECL bool is_v4_compatible() const;
+#endif // !defined(ASIO_NO_DEPRECATED)
+
+  /// Determine whether the address is a multicast address.
+  ASIO_DECL bool is_multicast() const;
+
+  /// Determine whether the address is a global multicast address.
+  ASIO_DECL bool is_multicast_global() const;
+
+  /// Determine whether the address is a link-local multicast address.
+  ASIO_DECL bool is_multicast_link_local() const;
+
+  /// Determine whether the address is a node-local multicast address.
+  ASIO_DECL bool is_multicast_node_local() const;
+
+  /// Determine whether the address is a org-local multicast address.
+  ASIO_DECL bool is_multicast_org_local() const;
+
+  /// Determine whether the address is a site-local multicast address.
+  ASIO_DECL bool is_multicast_site_local() const;
+
+  /// Compare two addresses for equality.
+  ASIO_DECL friend bool operator==(
+      const address_v6& a1, const address_v6& a2);
+
+  /// Compare two addresses for inequality.
+  friend bool operator!=(const address_v6& a1, const address_v6& a2)
+  {
+    return !(a1 == a2);
+  }
+
+  /// Compare addresses for ordering.
+  ASIO_DECL friend bool operator<(
+      const address_v6& a1, const address_v6& a2);
+
+  /// Compare addresses for ordering.
+  friend bool operator>(const address_v6& a1, const address_v6& a2)
+  {
+    return a2 < a1;
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator<=(const address_v6& a1, const address_v6& a2)
+  {
+    return !(a2 < a1);
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator>=(const address_v6& a1, const address_v6& a2)
+  {
+    return !(a1 < a2);
+  }
+
+  /// Obtain an address object that represents any address.
+  static address_v6 any()
+  {
+    return address_v6();
+  }
+
+  /// Obtain an address object that represents the loopback address.
+  ASIO_DECL static address_v6 loopback();
+
+#if !defined(ASIO_NO_DEPRECATED)
+  /// (Deprecated: Use make_address_v6().) Create an IPv4-mapped IPv6 address.
+  ASIO_DECL static address_v6 v4_mapped(const address_v4& addr);
+
+  /// (Deprecated: No replacement.) Create an IPv4-compatible IPv6 address.
+  ASIO_DECL static address_v6 v4_compatible(const address_v4& addr);
+#endif // !defined(ASIO_NO_DEPRECATED)
+
+private:
+  friend class basic_address_iterator<address_v6>;
+
+  // The underlying IPv6 address.
+  asio::detail::in6_addr_type addr_;
+
+  // The scope ID associated with the address.
+  unsigned long scope_id_;
+};
+
+/// Create an IPv6 address from raw bytes and scope ID.
+/**
+ * @relates address_v6
+ */
+inline address_v6 make_address_v6(const address_v6::bytes_type& bytes,
+    unsigned long scope_id = 0)
+{
+  return address_v6(bytes, scope_id);
+}
+
+/// Create an IPv6 address from an IP address string.
+/**
+ * @relates address_v6
+ */
+ASIO_DECL address_v6 make_address_v6(const char* str);
+
+/// Create an IPv6 address from an IP address string.
+/**
+ * @relates address_v6
+ */
+ASIO_DECL address_v6 make_address_v6(
+    const char* str, asio::error_code& ec);
+
+/// Createan IPv6 address from an IP address string.
+/**
+ * @relates address_v6
+ */
+ASIO_DECL address_v6 make_address_v6(const std::string& str);
+
+/// Create an IPv6 address from an IP address string.
+/**
+ * @relates address_v6
+ */
+ASIO_DECL address_v6 make_address_v6(
+    const std::string& str, asio::error_code& ec);
+
+#if defined(ASIO_HAS_STRING_VIEW) \
+  || defined(GENERATING_DOCUMENTATION)
+
+/// Create an IPv6 address from an IP address string.
+/**
+ * @relates address_v6
+ */
+ASIO_DECL address_v6 make_address_v6(string_view str);
+
+/// Create an IPv6 address from an IP address string.
+/**
+ * @relates address_v6
+ */
+ASIO_DECL address_v6 make_address_v6(
+    string_view str, asio::error_code& ec);
+
+#endif // defined(ASIO_HAS_STRING_VIEW)
+       //  || defined(GENERATING_DOCUMENTATION)
+
+/// Tag type used for distinguishing overloads that deal in IPv4-mapped IPv6
+/// addresses.
+enum v4_mapped_t { v4_mapped };
+
+/// Create an IPv4 address from a IPv4-mapped IPv6 address.
+/**
+ * @relates address_v4
+ */
+ASIO_DECL address_v4 make_address_v4(
+    v4_mapped_t, const address_v6& v6_addr);
+
+/// Create an IPv4-mapped IPv6 address from an IPv4 address.
+/**
+ * @relates address_v6
+ */
+ASIO_DECL address_v6 make_address_v6(
+    v4_mapped_t, const address_v4& v4_addr);
+
+#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_v6
+ */
+template <typename Elem, typename Traits>
+std::basic_ostream<Elem, Traits>& operator<<(
+    std::basic_ostream<Elem, Traits>& os, const address_v6& addr);
+
+#endif // !defined(ASIO_NO_IOSTREAM)
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/ip/impl/address_v6.hpp"
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/ip/impl/address_v6.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_IP_ADDRESS_V6_HPP