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diff --git a/lib/asio/detail/winrt_resolver_service.hpp b/lib/asio/detail/winrt_resolver_service.hpp
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+++ b/lib/asio/detail/winrt_resolver_service.hpp
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+//
+// detail/winrt_resolver_service.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_DETAIL_WINRT_RESOLVER_SERVICE_HPP
+#define ASIO_DETAIL_WINRT_RESOLVER_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_WINDOWS_RUNTIME)
+
+#include "asio/ip/basic_resolver_query.hpp"
+#include "asio/ip/basic_resolver_results.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/memory.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/winrt_async_manager.hpp"
+#include "asio/detail/winrt_resolve_op.hpp"
+#include "asio/detail/winrt_utils.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename Protocol>
+class winrt_resolver_service :
+  public service_base<winrt_resolver_service<Protocol> >
+{
+public:
+  // The implementation type of the resolver. A cancellation token is used to
+  // indicate to the asynchronous operation 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 asio::ip::basic_resolver_query<Protocol> query_type;
+
+  // The results type.
+  typedef asio::ip::basic_resolver_results<Protocol> results_type;
+
+  // Constructor.
+  winrt_resolver_service(asio::io_context& io_context)
+    : service_base<winrt_resolver_service<Protocol> >(io_context),
+      io_context_(use_service<io_context_impl>(io_context)),
+      async_manager_(use_service<winrt_async_manager>(io_context))
+  {
+  }
+
+  // Destructor.
+  ~winrt_resolver_service()
+  {
+  }
+
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown()
+  {
+  }
+
+  // Perform any fork-related housekeeping.
+  void notify_fork(asio::io_context::fork_event)
+  {
+  }
+
+  // Construct a new resolver implementation.
+  void construct(implementation_type&)
+  {
+  }
+
+  // Move-construct a new resolver implementation.
+  void move_construct(implementation_type&,
+      implementation_type&)
+  {
+  }
+
+  // Move-assign from another resolver implementation.
+  void move_assign(implementation_type&,
+      winrt_resolver_service&, implementation_type&)
+  {
+  }
+
+  // Destroy a resolver implementation.
+  void destroy(implementation_type&)
+  {
+  }
+
+  // Cancel pending asynchronous operations.
+  void cancel(implementation_type&)
+  {
+  }
+
+  // Resolve a query to a list of entries.
+  results_type resolve(implementation_type&,
+      const query_type& query, asio::error_code& ec)
+  {
+    try
+    {
+      using namespace Windows::Networking::Sockets;
+      auto endpoint_pairs = async_manager_.sync(
+          DatagramSocket::GetEndpointPairsAsync(
+            winrt_utils::host_name(query.host_name()),
+            winrt_utils::string(query.service_name())), ec);
+
+      if (ec)
+        return results_type();
+
+      return results_type::create(
+          endpoint_pairs, query.hints(),
+          query.host_name(), query.service_name());
+    }
+    catch (Platform::Exception^ e)
+    {
+      ec = asio::error_code(e->HResult,
+          asio::system_category());
+      return results_type();
+    }
+  }
+
+  // Asynchronously resolve a query to a list of entries.
+  template <typename Handler>
+  void async_resolve(implementation_type& impl,
+      const query_type& query, Handler& handler)
+  {
+    bool is_continuation =
+      asio_handler_cont_helpers::is_continuation(handler);
+
+    // Allocate and construct an operation to wrap the handler.
+    typedef winrt_resolve_op<Protocol, Handler> op;
+    typename op::ptr p = { asio::detail::addressof(handler),
+      op::ptr::allocate(handler), 0 };
+    p.p = new (p.v) op(query, handler);
+
+    ASIO_HANDLER_CREATION((io_context_.context(),
+          *p.p, "resolver", &impl, 0, "async_resolve"));
+    (void)impl;
+
+    try
+    {
+      using namespace Windows::Networking::Sockets;
+      async_manager_.async(DatagramSocket::GetEndpointPairsAsync(
+            winrt_utils::host_name(query.host_name()),
+            winrt_utils::string(query.service_name())), p.p);
+      p.v = p.p = 0;
+    }
+    catch (Platform::Exception^ e)
+    {
+      p.p->ec_ = asio::error_code(
+          e->HResult, asio::system_category());
+      io_context_.post_immediate_completion(p.p, is_continuation);
+      p.v = p.p = 0;
+    }
+  }
+
+  // Resolve an endpoint to a list of entries.
+  results_type resolve(implementation_type&,
+      const endpoint_type&, asio::error_code& ec)
+  {
+    ec = asio::error::operation_not_supported;
+    return results_type();
+  }
+
+  // Asynchronously resolve an endpoint to a list of entries.
+  template <typename Handler>
+  void async_resolve(implementation_type&,
+      const endpoint_type&, Handler& handler)
+  {
+    asio::error_code ec = asio::error::operation_not_supported;
+    const results_type results;
+    io_context_.get_io_context().post(
+        detail::bind_handler(handler, ec, results));
+  }
+
+private:
+  io_context_impl& io_context_;
+  winrt_async_manager& async_manager_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_WINDOWS_RUNTIME)
+
+#endif // ASIO_DETAIL_WINRT_RESOLVER_SERVICE_HPP