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diff --git a/lib/asio/detail/resolver_service_base.hpp b/lib/asio/detail/resolver_service_base.hpp
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+++ b/lib/asio/detail/resolver_service_base.hpp
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+//
+// detail/resolver_service_base.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_RESOLVER_SERVICE_BASE_HPP
+#define ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/error.hpp"
+#include "asio/executor_work_guard.hpp"
+#include "asio/io_context.hpp"
+#include "asio/detail/mutex.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/resolve_op.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/detail/socket_types.hpp"
+#include "asio/detail/scoped_ptr.hpp"
+#include "asio/detail/thread.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class 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;
+
+  // Constructor.
+  ASIO_DECL resolver_service_base(asio::io_context& io_context);
+
+  // Destructor.
+  ASIO_DECL ~resolver_service_base();
+
+  // Destroy all user-defined handler objects owned by the service.
+  ASIO_DECL void base_shutdown();
+
+  // Perform any fork-related housekeeping.
+  ASIO_DECL void base_notify_fork(
+      asio::io_context::fork_event fork_ev);
+
+  // Construct a new resolver implementation.
+  ASIO_DECL void construct(implementation_type& impl);
+
+  // Destroy a resolver implementation.
+  ASIO_DECL void destroy(implementation_type&);
+
+  // Move-construct a new resolver implementation.
+  ASIO_DECL void move_construct(implementation_type& impl,
+      implementation_type& other_impl);
+
+  // Move-assign from another resolver implementation.
+  ASIO_DECL void move_assign(implementation_type& impl,
+      resolver_service_base& other_service,
+      implementation_type& other_impl);
+
+  // Cancel pending asynchronous operations.
+  ASIO_DECL void cancel(implementation_type& impl);
+
+protected:
+  // Helper function to start an asynchronous resolve operation.
+  ASIO_DECL void start_resolve_op(resolve_op* op);
+
+#if !defined(ASIO_WINDOWS_RUNTIME)
+  // Helper class to perform exception-safe cleanup of addrinfo objects.
+  class auto_addrinfo
+    : private asio::detail::noncopyable
+  {
+  public:
+    explicit auto_addrinfo(asio::detail::addrinfo_type* ai)
+      : ai_(ai)
+    {
+    }
+
+    ~auto_addrinfo()
+    {
+      if (ai_)
+        socket_ops::freeaddrinfo(ai_);
+    }
+
+    operator asio::detail::addrinfo_type*()
+    {
+      return ai_;
+    }
+
+  private:
+    asio::detail::addrinfo_type* ai_;
+  };
+#endif // !defined(ASIO_WINDOWS_RUNTIME)
+
+  // Helper class to run the work io_context in a thread.
+  class work_io_context_runner;
+
+  // Start the work thread if it's not already running.
+  ASIO_DECL void start_work_thread();
+
+  // The io_context implementation used to post completions.
+  io_context_impl& io_context_impl_;
+
+private:
+  // Mutex to protect access to internal data.
+  asio::detail::mutex mutex_;
+
+  // Private io_context used for performing asynchronous host resolution.
+  asio::detail::scoped_ptr<asio::io_context> work_io_context_;
+
+  // The work io_context implementation used to post completions.
+  io_context_impl& work_io_context_impl_;
+
+  // Work for the private io_context to perform.
+  asio::executor_work_guard<
+      asio::io_context::executor_type> work_;
+
+  // Thread used for running the work io_context's run loop.
+  asio::detail::scoped_ptr<asio::detail::thread> work_thread_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/resolver_service_base.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP