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diff --git a/lib/asio/ip/resolver_service.hpp b/lib/asio/ip/resolver_service.hpp
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+//
+// ip/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_IP_RESOLVER_SERVICE_HPP
+#define ASIO_IP_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_ENABLE_OLD_SERVICES)
+
+#include "asio/async_result.hpp"
+#include "asio/error_code.hpp"
+#include "asio/io_context.hpp"
+#include "asio/ip/basic_resolver_iterator.hpp"
+#include "asio/ip/basic_resolver_query.hpp"
+#include "asio/ip/basic_resolver_results.hpp"
+
+#if defined(ASIO_WINDOWS_RUNTIME)
+# include "asio/detail/winrt_resolver_service.hpp"
+#else
+# include "asio/detail/resolver_service.hpp"
+#endif
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace ip {
+
+/// Default service implementation for a resolver.
+template <typename InternetProtocol>
+class resolver_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public asio::io_context::service
+#else
+  : public asio::detail::service_base<
+      resolver_service<InternetProtocol> >
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static asio::io_context::id id;
+#endif
+
+  /// The protocol type.
+  typedef InternetProtocol protocol_type;
+
+  /// The endpoint type.
+  typedef typename InternetProtocol::endpoint endpoint_type;
+
+  /// The query type.
+  typedef basic_resolver_query<InternetProtocol> query_type;
+
+  /// The iterator type.
+  typedef basic_resolver_iterator<InternetProtocol> iterator_type;
+
+  /// The results type.
+  typedef basic_resolver_results<InternetProtocol> results_type;
+
+private:
+  // The type of the platform-specific implementation.
+#if defined(ASIO_WINDOWS_RUNTIME)
+  typedef asio::detail::winrt_resolver_service<InternetProtocol>
+    service_impl_type;
+#else
+  typedef asio::detail::resolver_service<InternetProtocol>
+    service_impl_type;
+#endif
+
+public:
+  /// The type of a resolver implementation.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef typename service_impl_type::implementation_type implementation_type;
+#endif
+
+  /// Construct a new resolver service for the specified io_context.
+  explicit resolver_service(asio::io_context& io_context)
+    : asio::detail::service_base<
+        resolver_service<InternetProtocol> >(io_context),
+      service_impl_(io_context)
+  {
+  }
+
+  /// Construct a new resolver implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move-construct a new resolver implementation.
+  void move_construct(implementation_type& impl,
+      implementation_type& other_impl)
+  {
+    service_impl_.move_construct(impl, other_impl);
+  }
+
+  /// Move-assign from another resolver implementation.
+  void move_assign(implementation_type& impl,
+      resolver_service& other_service,
+      implementation_type& other_impl)
+  {
+    service_impl_.move_assign(impl, other_service.service_impl_, other_impl);
+  }
+#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Destroy a resolver implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  /// Cancel pending asynchronous operations.
+  void cancel(implementation_type& impl)
+  {
+    service_impl_.cancel(impl);
+  }
+
+  /// Resolve a query to a list of entries.
+  results_type resolve(implementation_type& impl, const query_type& query,
+      asio::error_code& ec)
+  {
+    return service_impl_.resolve(impl, query, ec);
+  }
+
+  /// Asynchronously resolve a query to a list of entries.
+  template <typename ResolveHandler>
+  ASIO_INITFN_RESULT_TYPE(ResolveHandler,
+      void (asio::error_code, results_type))
+  async_resolve(implementation_type& impl, const query_type& query,
+      ASIO_MOVE_ARG(ResolveHandler) handler)
+  {
+    asio::async_completion<ResolveHandler,
+      void (asio::error_code, results_type)> init(handler);
+
+    service_impl_.async_resolve(impl, query, init.completion_handler);
+
+    return init.result.get();
+  }
+
+  /// Resolve an endpoint to a list of entries.
+  results_type resolve(implementation_type& impl,
+      const endpoint_type& endpoint, asio::error_code& ec)
+  {
+    return service_impl_.resolve(impl, endpoint, ec);
+  }
+
+  /// Asynchronously resolve an endpoint to a list of entries.
+  template <typename ResolveHandler>
+  ASIO_INITFN_RESULT_TYPE(ResolveHandler,
+      void (asio::error_code, results_type))
+  async_resolve(implementation_type& impl, const endpoint_type& endpoint,
+      ASIO_MOVE_ARG(ResolveHandler) handler)
+  {
+    asio::async_completion<ResolveHandler,
+      void (asio::error_code, results_type)> init(handler);
+
+    service_impl_.async_resolve(impl, endpoint, init.completion_handler);
+
+    return init.result.get();
+  }
+
+private:
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown()
+  {
+    service_impl_.shutdown();
+  }
+
+  // Perform any fork-related housekeeping.
+  void notify_fork(asio::io_context::fork_event event)
+  {
+    service_impl_.notify_fork(event);
+  }
+
+  // The platform-specific implementation.
+  service_impl_type service_impl_;
+};
+
+} // namespace ip
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_ENABLE_OLD_SERVICES)
+
+#endif // ASIO_IP_RESOLVER_SERVICE_HPP