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diff --git a/boost/asio/detail/resolver_service.hpp b/boost/asio/detail/resolver_service.hpp
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+//
+// detail/resolver_service.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_DETAIL_RESOLVER_SERVICE_HPP
+#define BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <boost/asio/ip/basic_resolver_iterator.hpp>
+#include <boost/asio/ip/basic_resolver_query.hpp>
+#include <boost/asio/detail/resolve_endpoint_op.hpp>
+#include <boost/asio/detail/resolve_op.hpp>
+#include <boost/asio/detail/resolver_service_base.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+template <typename Protocol>
+class resolver_service : public resolver_service_base
+{
+public:
+  // The implementation type of the resolver. A cancellation token is used to
+  // indicate to the background thread that the operation has been cancelled.
+  typedef socket_ops::shared_cancel_token_type implementation_type;
+
+  // The endpoint type.
+  typedef typename Protocol::endpoint endpoint_type;
+
+  // The query type.
+  typedef boost::asio::ip::basic_resolver_query<Protocol> query_type;
+
+  // The iterator type.
+  typedef boost::asio::ip::basic_resolver_iterator<Protocol> iterator_type;
+
+  // Constructor.
+  resolver_service(boost::asio::io_service& io_service)
+    : resolver_service_base(io_service)
+  {
+  }
+
+  // Resolve a query to a list of entries.
+  iterator_type resolve(implementation_type&, const query_type& query,
+      boost::system::error_code& ec)
+  {
+    boost::asio::detail::addrinfo_type* address_info = 0;
+
+    socket_ops::getaddrinfo(query.host_name().c_str(),
+        query.service_name().c_str(), query.hints(), &address_info, ec);
+    auto_addrinfo auto_address_info(address_info);
+
+    return ec ? iterator_type() : iterator_type::create(
+        address_info, query.host_name(), query.service_name());
+  }
+
+  // Asynchronously resolve a query to a list of entries.
+  template <typename Handler>
+  void async_resolve(implementation_type& impl,
+      const query_type& query, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef resolve_op<Protocol, Handler> op;
+    typename op::ptr p = { boost::addressof(handler),
+      boost_asio_handler_alloc_helpers::allocate(
+        sizeof(op), handler), 0 };
+    p.p = new (p.v) op(impl, query, io_service_impl_, handler);
+
+    BOOST_ASIO_HANDLER_CREATION((p.p, "resolver", &impl, "async_resolve"));
+
+    start_resolve_op(p.p);
+    p.v = p.p = 0;
+  }
+
+  // Resolve an endpoint to a list of entries.
+  iterator_type resolve(implementation_type&,
+      const endpoint_type& endpoint, boost::system::error_code& ec)
+  {
+    char host_name[NI_MAXHOST];
+    char service_name[NI_MAXSERV];
+    socket_ops::sync_getnameinfo(endpoint.data(), endpoint.size(),
+        host_name, NI_MAXHOST, service_name, NI_MAXSERV,
+        endpoint.protocol().type(), ec);
+
+    return ec ? iterator_type() : iterator_type::create(
+        endpoint, host_name, service_name);
+  }
+
+  // Asynchronously resolve an endpoint to a list of entries.
+  template <typename Handler>
+  void async_resolve(implementation_type& impl,
+      const endpoint_type& endpoint, Handler handler)
+  {
+    // Allocate and construct an operation to wrap the handler.
+    typedef resolve_endpoint_op<Protocol, Handler> op;
+    typename op::ptr p = { boost::addressof(handler),
+      boost_asio_handler_alloc_helpers::allocate(
+        sizeof(op), handler), 0 };
+    p.p = new (p.v) op(impl, endpoint, io_service_impl_, handler);
+
+    BOOST_ASIO_HANDLER_CREATION((p.p, "resolver", &impl, "async_resolve"));
+
+    start_resolve_op(p.p);
+    p.v = p.p = 0;
+  }
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP