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diff --git a/lib/asio/ip/address_v4.hpp b/lib/asio/ip/address_v4.hpp
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+++ b/lib/asio/ip/address_v4.hpp
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+//
+// ip/address_v4.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_V4_HPP
+#define ASIO_IP_ADDRESS_V4_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/cstdint.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/string_view.hpp"
+#include "asio/detail/winsock_init.hpp"
+#include "asio/error_code.hpp"
+
+#if !defined(ASIO_NO_IOSTREAM)
+# include <iosfwd>
+#endif // !defined(ASIO_NO_IOSTREAM)
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Implements IP version 4 style addresses.
+/**
+ * The asio::ip::address_v4 class provides the ability to use and
+ * manipulate IP version 4 addresses.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+class address_v4
+{
+public:
+  /// The type used to represent an address as an unsigned integer.
+  typedef uint_least32_t uint_type;
+
+  /// 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, 4> bytes_type;
+#else
+  typedef asio::detail::array<unsigned char, 4> bytes_type;
+#endif
+
+  /// Default constructor.
+  address_v4()
+  {
+    addr_.s_addr = 0;
+  }
+
+  /// Construct an address from raw bytes.
+  ASIO_DECL explicit address_v4(const bytes_type& bytes);
+
+  /// Construct an address from an unsigned integer in host byte order.
+  ASIO_DECL explicit address_v4(uint_type addr);
+
+  /// Copy constructor.
+  address_v4(const address_v4& other)
+    : addr_(other.addr_)
+  {
+  }
+
+#if defined(ASIO_HAS_MOVE)
+  /// Move constructor.
+  address_v4(address_v4&& other)
+    : addr_(other.addr_)
+  {
+  }
+#endif // defined(ASIO_HAS_MOVE)
+
+  /// Assign from another address.
+  address_v4& operator=(const address_v4& other)
+  {
+    addr_ = other.addr_;
+    return *this;
+  }
+
+#if defined(ASIO_HAS_MOVE)
+  /// Move-assign from another address.
+  address_v4& operator=(address_v4&& other)
+  {
+    addr_ = other.addr_;
+    return *this;
+  }
+#endif // defined(ASIO_HAS_MOVE)
+
+  /// Get the address in bytes, in network byte order.
+  ASIO_DECL bytes_type to_bytes() const;
+
+  /// Get the address as an unsigned integer in host byte order
+  ASIO_DECL uint_type to_uint() const;
+
+#if !defined(ASIO_NO_DEPRECATED)
+  /// Get the address as an unsigned long in host byte order
+  ASIO_DECL unsigned long to_ulong() const;
+#endif // !defined(ASIO_NO_DEPRECATED)
+
+  /// Get the address as a string in dotted decimal format.
+  ASIO_DECL std::string to_string() const;
+
+#if !defined(ASIO_NO_DEPRECATED)
+  /// (Deprecated: Use other overload.) Get the address as a string in dotted
+  /// decimal format.
+  ASIO_DECL std::string to_string(asio::error_code& ec) const;
+
+  /// (Deprecated: Use make_address_v4().) Create an address from an IP address
+  /// string in dotted decimal form.
+  static address_v4 from_string(const char* str);
+
+  /// (Deprecated: Use make_address_v4().) Create an address from an IP address
+  /// string in dotted decimal form.
+  static address_v4 from_string(
+      const char* str, asio::error_code& ec);
+
+  /// (Deprecated: Use make_address_v4().) Create an address from an IP address
+  /// string in dotted decimal form.
+  static address_v4 from_string(const std::string& str);
+
+  /// (Deprecated: Use make_address_v4().) Create an address from an IP address
+  /// string in dotted decimal form.
+  static address_v4 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;
+
+#if !defined(ASIO_NO_DEPRECATED)
+  /// (Deprecated: Use network_v4 class.) Determine whether the address is a
+  /// class A address.
+  ASIO_DECL bool is_class_a() const;
+
+  /// (Deprecated: Use network_v4 class.) Determine whether the address is a
+  /// class B address.
+  ASIO_DECL bool is_class_b() const;
+
+  /// (Deprecated: Use network_v4 class.) Determine whether the address is a
+  /// class C address.
+  ASIO_DECL bool is_class_c() const;
+#endif // !defined(ASIO_NO_DEPRECATED)
+
+  /// Determine whether the address is a multicast address.
+  ASIO_DECL bool is_multicast() const;
+
+  /// Compare two addresses for equality.
+  friend bool operator==(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.addr_.s_addr == a2.addr_.s_addr;
+  }
+
+  /// Compare two addresses for inequality.
+  friend bool operator!=(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.addr_.s_addr != a2.addr_.s_addr;
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator<(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.to_uint() < a2.to_uint();
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator>(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.to_uint() > a2.to_uint();
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator<=(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.to_uint() <= a2.to_uint();
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator>=(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.to_uint() >= a2.to_uint();
+  }
+
+  /// Obtain an address object that represents any address.
+  static address_v4 any()
+  {
+    return address_v4();
+  }
+
+  /// Obtain an address object that represents the loopback address.
+  static address_v4 loopback()
+  {
+    return address_v4(0x7F000001);
+  }
+
+  /// Obtain an address object that represents the broadcast address.
+  static address_v4 broadcast()
+  {
+    return address_v4(0xFFFFFFFF);
+  }
+
+#if !defined(ASIO_NO_DEPRECATED)
+  /// (Deprecated: Use network_v4 class.) Obtain an address object that
+  /// represents the broadcast address that corresponds to the specified
+  /// address and netmask.
+  ASIO_DECL static address_v4 broadcast(
+      const address_v4& addr, const address_v4& mask);
+
+  /// (Deprecated: Use network_v4 class.) Obtain the netmask that corresponds
+  /// to the address, based on its address class.
+  ASIO_DECL static address_v4 netmask(const address_v4& addr);
+#endif // !defined(ASIO_NO_DEPRECATED)
+
+private:
+  // The underlying IPv4 address.
+  asio::detail::in4_addr_type addr_;
+};
+
+/// Create an IPv4 address from raw bytes in network order.
+/**
+ * @relates address_v4
+ */
+inline address_v4 make_address_v4(const address_v4::bytes_type& bytes)
+{
+  return address_v4(bytes);
+}
+
+/// Create an IPv4 address from an unsigned integer in host byte order.
+/**
+ * @relates address_v4
+ */
+inline address_v4 make_address_v4(address_v4::uint_type addr)
+{
+  return address_v4(addr);
+}
+
+/// Create an IPv4 address from an IP address string in dotted decimal form.
+/**
+ * @relates address_v4
+ */
+ASIO_DECL address_v4 make_address_v4(const char* str);
+
+/// Create an IPv4 address from an IP address string in dotted decimal form.
+/**
+ * @relates address_v4
+ */
+ASIO_DECL address_v4 make_address_v4(
+    const char* str, asio::error_code& ec);
+
+/// Create an IPv4 address from an IP address string in dotted decimal form.
+/**
+ * @relates address_v4
+ */
+ASIO_DECL address_v4 make_address_v4(const std::string& str);
+
+/// Create an IPv4 address from an IP address string in dotted decimal form.
+/**
+ * @relates address_v4
+ */
+ASIO_DECL address_v4 make_address_v4(
+    const std::string& str, asio::error_code& ec);
+
+#if defined(ASIO_HAS_STRING_VIEW) \
+  || defined(GENERATING_DOCUMENTATION)
+
+/// Create an IPv4 address from an IP address string in dotted decimal form.
+/**
+ * @relates address_v4
+ */
+ASIO_DECL address_v4 make_address_v4(string_view str);
+
+/// Create an IPv4 address from an IP address string in dotted decimal form.
+/**
+ * @relates address_v4
+ */
+ASIO_DECL address_v4 make_address_v4(
+    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_v4
+ */
+template <typename Elem, typename Traits>
+std::basic_ostream<Elem, Traits>& operator<<(
+    std::basic_ostream<Elem, Traits>& os, const address_v4& addr);
+
+#endif // !defined(ASIO_NO_IOSTREAM)
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/ip/impl/address_v4.hpp"
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/ip/impl/address_v4.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_IP_ADDRESS_V4_HPP