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diff --git a/boost/asio/ip/address_v4.hpp b/boost/asio/ip/address_v4.hpp
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+//
+// ip/address_v4.hpp
+// ~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 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 BOOST_ASIO_IP_ADDRESS_V4_HPP
+#define BOOST_ASIO_IP_ADDRESS_V4_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <string>
+#include <boost/asio/detail/array.hpp>
+#include <boost/asio/detail/socket_types.hpp>
+#include <boost/asio/detail/winsock_init.hpp>
+#include <boost/system/error_code.hpp>
+
+#if !defined(BOOST_NO_IOSTREAM)
+# include <iosfwd>
+#endif // !defined(BOOST_NO_IOSTREAM)
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace ip {
+
+/// Implements IP version 4 style addresses.
+/**
+ * The boost::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 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 boost::asio::detail::array<unsigned char, 4> bytes_type;
+#endif
+
+  /// Default constructor.
+  address_v4()
+  {
+    addr_.s_addr = 0;
+  }
+
+  /// Construct an address from raw bytes.
+  BOOST_ASIO_DECL explicit address_v4(const bytes_type& bytes);
+
+  /// Construct an address from a unsigned long in host byte order.
+  BOOST_ASIO_DECL explicit address_v4(unsigned long addr);
+
+  /// Copy constructor.
+  address_v4(const address_v4& other)
+    : addr_(other.addr_)
+  {
+  }
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+  /// Move constructor.
+  address_v4(address_v4&& other)
+    : addr_(other.addr_)
+  {
+  }
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+  /// Assign from another address.
+  address_v4& operator=(const address_v4& other)
+  {
+    addr_ = other.addr_;
+    return *this;
+  }
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+  /// Move-assign from another address.
+  address_v4& operator=(address_v4&& other)
+  {
+    addr_ = other.addr_;
+    return *this;
+  }
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+  /// Get the address in bytes, in network byte order.
+  BOOST_ASIO_DECL bytes_type to_bytes() const;
+
+  /// Get the address as an unsigned long in host byte order
+  BOOST_ASIO_DECL unsigned long to_ulong() const;
+
+  /// Get the address as a string in dotted decimal format.
+  BOOST_ASIO_DECL std::string to_string() const;
+
+  /// Get the address as a string in dotted decimal format.
+  BOOST_ASIO_DECL std::string to_string(boost::system::error_code& ec) const;
+
+  /// Create an address from an IP address string in dotted decimal form.
+  BOOST_ASIO_DECL static address_v4 from_string(const char* str);
+
+  /// Create an address from an IP address string in dotted decimal form.
+  BOOST_ASIO_DECL static address_v4 from_string(
+      const char* str, boost::system::error_code& ec);
+
+  /// Create an address from an IP address string in dotted decimal form.
+  BOOST_ASIO_DECL static address_v4 from_string(const std::string& str);
+
+  /// Create an address from an IP address string in dotted decimal form.
+  BOOST_ASIO_DECL static address_v4 from_string(
+      const std::string& str, boost::system::error_code& ec);
+
+  /// Determine whether the address is a loopback address.
+  BOOST_ASIO_DECL bool is_loopback() const;
+
+  /// Determine whether the address is unspecified.
+  BOOST_ASIO_DECL bool is_unspecified() const;
+
+  /// Determine whether the address is a class A address.
+  BOOST_ASIO_DECL bool is_class_a() const;
+
+  /// Determine whether the address is a class B address.
+  BOOST_ASIO_DECL bool is_class_b() const;
+
+  /// Determine whether the address is a class C address.
+  BOOST_ASIO_DECL bool is_class_c() const;
+
+  /// Determine whether the address is a multicast address.
+  BOOST_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_ulong() < a2.to_ulong();
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator>(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.to_ulong() > a2.to_ulong();
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator<=(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.to_ulong() <= a2.to_ulong();
+  }
+
+  /// Compare addresses for ordering.
+  friend bool operator>=(const address_v4& a1, const address_v4& a2)
+  {
+    return a1.to_ulong() >= a2.to_ulong();
+  }
+
+  /// 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);
+  }
+
+  /// Obtain an address object that represents the broadcast address that
+  /// corresponds to the specified address and netmask.
+  BOOST_ASIO_DECL static address_v4 broadcast(
+      const address_v4& addr, const address_v4& mask);
+
+  /// Obtain the netmask that corresponds to the address, based on its address
+  /// class.
+  BOOST_ASIO_DECL static address_v4 netmask(const address_v4& addr);
+
+private:
+  // The underlying IPv4 address.
+  boost::asio::detail::in4_addr_type addr_;
+};
+
+#if !defined(BOOST_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 boost::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(BOOST_NO_IOSTREAM)
+
+} // namespace ip
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/ip/impl/address_v4.hpp>
+#if defined(BOOST_ASIO_HEADER_ONLY)
+# include <boost/asio/ip/impl/address_v4.ipp>
+#endif // defined(BOOST_ASIO_HEADER_ONLY)
+
+#endif // BOOST_ASIO_IP_ADDRESS_V4_HPP