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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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-//
-// 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