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diff --git a/lib/asio/io_context.hpp b/lib/asio/io_context.hpp
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-//
-// io_context.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_IO_CONTEXT_HPP
-#define ASIO_IO_CONTEXT_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include <cstddef>
-#include <stdexcept>
-#include <typeinfo>
-#include "asio/async_result.hpp"
-#include "asio/detail/noncopyable.hpp"
-#include "asio/detail/wrapped_handler.hpp"
-#include "asio/error_code.hpp"
-#include "asio/execution_context.hpp"
-
-#if defined(ASIO_HAS_CHRONO)
-# include "asio/detail/chrono.hpp"
-#endif // defined(ASIO_HAS_CHRONO)
-
-#if defined(ASIO_WINDOWS) || defined(__CYGWIN__)
-# include "asio/detail/winsock_init.hpp"
-#elif defined(__sun) || defined(__QNX__) || defined(__hpux) || defined(_AIX) \
-  || defined(__osf__)
-# include "asio/detail/signal_init.hpp"
-#endif
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-namespace detail {
-#if defined(ASIO_HAS_IOCP)
-  typedef class win_iocp_io_context io_context_impl;
-  class win_iocp_overlapped_ptr;
-#else
-  typedef class scheduler io_context_impl;
-#endif
-} // namespace detail
-
-/// Provides core I/O functionality.
-/**
- * The io_context class provides the core I/O functionality for users of the
- * asynchronous I/O objects, including:
- *
- * @li asio::ip::tcp::socket
- * @li asio::ip::tcp::acceptor
- * @li asio::ip::udp::socket
- * @li asio::deadline_timer.
- *
- * The io_context class also includes facilities intended for developers of
- * custom asynchronous services.
- *
- * @par Thread Safety
- * @e Distinct @e objects: Safe.@n
- * @e Shared @e objects: Safe, with the specific exceptions of the restart()
- * and notify_fork() functions. Calling restart() while there are unfinished
- * run(), run_one(), run_for(), run_until(), poll() or poll_one() calls results
- * in undefined behaviour. The notify_fork() function should not be called
- * while any io_context function, or any function on an I/O object that is
- * associated with the io_context, is being called in another thread.
- *
- * @par Concepts:
- * Dispatcher.
- *
- * @par Synchronous and asynchronous operations
- *
- * Synchronous operations on I/O objects implicitly run the io_context object
- * for an individual operation. The io_context functions run(), run_one(),
- * run_for(), run_until(), poll() or poll_one() must be called for the
- * io_context to perform asynchronous operations on behalf of a C++ program.
- * Notification that an asynchronous operation has completed is delivered by
- * invocation of the associated handler. Handlers are invoked only by a thread
- * that is currently calling any overload of run(), run_one(), run_for(),
- * run_until(), poll() or poll_one() for the io_context.
- *
- * @par Effect of exceptions thrown from handlers
- *
- * If an exception is thrown from a handler, the exception is allowed to
- * propagate through the throwing thread's invocation of run(), run_one(),
- * run_for(), run_until(), poll() or poll_one(). No other threads that are
- * calling any of these functions are affected. It is then the responsibility
- * of the application to catch the exception.
- *
- * After the exception has been caught, the run(), run_one(), run_for(),
- * run_until(), poll() or poll_one() call may be restarted @em without the need
- * for an intervening call to restart(). This allows the thread to rejoin the
- * io_context object's thread pool without impacting any other threads in the
- * pool.
- *
- * For example:
- *
- * @code
- * asio::io_context io_context;
- * ...
- * for (;;)
- * {
- *   try
- *   {
- *     io_context.run();
- *     break; // run() exited normally
- *   }
- *   catch (my_exception& e)
- *   {
- *     // Deal with exception as appropriate.
- *   }
- * }
- * @endcode
- *
- * @par Submitting arbitrary tasks to the io_context
- *
- * To submit functions to the io_context, use the @ref asio::dispatch,
- * @ref asio::post or @ref asio::defer free functions.
- *
- * For example:
- *
- * @code void my_task()
- * {
- *   ...
- * }
- *
- * ...
- *
- * asio::io_context io_context;
- *
- * // Submit a function to the io_context.
- * asio::post(io_context, my_task);
- *
- * // Submit a lambda object to the io_context.
- * asio::post(io_context,
- *     []()
- *     {
- *       ...
- *     });
- *
- * // Run the io_context until it runs out of work.
- * io_context.run(); @endcode
- *
- * @par Stopping the io_context from running out of work
- *
- * Some applications may need to prevent an io_context object's run() call from
- * returning when there is no more work to do. For example, the io_context may
- * be being run in a background thread that is launched prior to the
- * application's asynchronous operations. The run() call may be kept running by
- * creating an object of type
- * asio::executor_work_guard<io_context::executor_type>:
- *
- * @code asio::io_context io_context;
- * asio::executor_work_guard<asio::io_context::executor_type>
- *   = asio::make_work_guard(io_context);
- * ... @endcode
- *
- * To effect a shutdown, the application will then need to call the io_context
- * object's stop() member function. This will cause the io_context run() call
- * to return as soon as possible, abandoning unfinished operations and without
- * permitting ready handlers to be dispatched.
- *
- * Alternatively, if the application requires that all operations and handlers
- * be allowed to finish normally, the work object may be explicitly reset.
- *
- * @code asio::io_context io_context;
- * asio::executor_work_guard<asio::io_context::executor_type>
- *   = asio::make_work_guard(io_context);
- * ...
- * work.reset(); // Allow run() to exit. @endcode
- */
-class io_context
-  : public execution_context
-{
-private:
-  typedef detail::io_context_impl impl_type;
-#if defined(ASIO_HAS_IOCP)
-  friend class detail::win_iocp_overlapped_ptr;
-#endif
-
-public:
-  class executor_type;
-  friend class executor_type;
-
-#if !defined(ASIO_NO_DEPRECATED)
-  class work;
-  friend class work;
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-  class service;
-
-#if !defined(ASIO_NO_EXTENSIONS)
-  class strand;
-#endif // !defined(ASIO_NO_EXTENSIONS)
-
-  /// The type used to count the number of handlers executed by the context.
-  typedef std::size_t count_type;
-
-  /// Constructor.
-  ASIO_DECL io_context();
-
-  /// Constructor.
-  /**
-   * Construct with a hint about the required level of concurrency.
-   *
-   * @param concurrency_hint A suggestion to the implementation on how many
-   * threads it should allow to run simultaneously.
-   */
-  ASIO_DECL explicit io_context(int concurrency_hint);
-
-  /// Destructor.
-  /**
-   * On destruction, the io_context performs the following sequence of
-   * operations:
-   *
-   * @li For each service object @c svc in the io_context set, in reverse order
-   * of the beginning of service object lifetime, performs
-   * @c svc->shutdown().
-   *
-   * @li Uninvoked handler objects that were scheduled for deferred invocation
-   * on the io_context, or any associated strand, are destroyed.
-   *
-   * @li For each service object @c svc in the io_context set, in reverse order
-   * of the beginning of service object lifetime, performs
-   * <tt>delete static_cast<io_context::service*>(svc)</tt>.
-   *
-   * @note The destruction sequence described above permits programs to
-   * simplify their resource management by using @c shared_ptr<>. Where an
-   * object's lifetime is tied to the lifetime of a connection (or some other
-   * sequence of asynchronous operations), a @c shared_ptr to the object would
-   * be bound into the handlers for all asynchronous operations associated with
-   * it. This works as follows:
-   *
-   * @li When a single connection ends, all associated asynchronous operations
-   * complete. The corresponding handler objects are destroyed, and all
-   * @c shared_ptr references to the objects are destroyed.
-   *
-   * @li To shut down the whole program, the io_context function stop() is
-   * called to terminate any run() calls as soon as possible. The io_context
-   * destructor defined above destroys all handlers, causing all @c shared_ptr
-   * references to all connection objects to be destroyed.
-   */
-  ASIO_DECL ~io_context();
-
-  /// Obtains the executor associated with the io_context.
-  executor_type get_executor() ASIO_NOEXCEPT;
-
-  /// Run the io_context object's event processing loop.
-  /**
-   * The run() function blocks until all work has finished and there are no
-   * more handlers to be dispatched, or until the io_context has been stopped.
-   *
-   * Multiple threads may call the run() function to set up a pool of threads
-   * from which the io_context may execute handlers. All threads that are
-   * waiting in the pool are equivalent and the io_context may choose any one
-   * of them to invoke a handler.
-   *
-   * A normal exit from the run() function implies that the io_context object
-   * is stopped (the stopped() function returns @c true). Subsequent calls to
-   * run(), run_one(), poll() or poll_one() will return immediately unless there
-   * is a prior call to restart().
-   *
-   * @return The number of handlers that were executed.
-   *
-   * @note Calling the run() function from a thread that is currently calling
-   * one of run(), run_one(), run_for(), run_until(), poll() or poll_one() on
-   * the same io_context object may introduce the potential for deadlock. It is
-   * the caller's reponsibility to avoid this.
-   *
-   * The poll() function may also be used to dispatch ready handlers, but
-   * without blocking.
-   */
-  ASIO_DECL count_type run();
-
-#if !defined(ASIO_NO_DEPRECATED)
-  /// (Deprecated: Use non-error_code overload.) Run the io_context object's
-  /// event processing loop.
-  /**
-   * The run() function blocks until all work has finished and there are no
-   * more handlers to be dispatched, or until the io_context has been stopped.
-   *
-   * Multiple threads may call the run() function to set up a pool of threads
-   * from which the io_context may execute handlers. All threads that are
-   * waiting in the pool are equivalent and the io_context may choose any one
-   * of them to invoke a handler.
-   *
-   * A normal exit from the run() function implies that the io_context object
-   * is stopped (the stopped() function returns @c true). Subsequent calls to
-   * run(), run_one(), poll() or poll_one() will return immediately unless there
-   * is a prior call to restart().
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @return The number of handlers that were executed.
-   *
-   * @note Calling the run() function from a thread that is currently calling
-   * one of run(), run_one(), run_for(), run_until(), poll() or poll_one() on
-   * the same io_context object may introduce the potential for deadlock. It is
-   * the caller's reponsibility to avoid this.
-   *
-   * The poll() function may also be used to dispatch ready handlers, but
-   * without blocking.
-   */
-  ASIO_DECL count_type run(asio::error_code& ec);
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-#if defined(ASIO_HAS_CHRONO) || defined(GENERATING_DOCUMENTATION)
-  /// Run the io_context object's event processing loop for a specified
-  /// duration.
-  /**
-   * The run_for() function blocks until all work has finished and there are no
-   * more handlers to be dispatched, until the io_context has been stopped, or
-   * until the specified duration has elapsed.
-   *
-   * @param rel_time The duration for which the call may block.
-   *
-   * @return The number of handlers that were executed.
-   */
-  template <typename Rep, typename Period>
-  std::size_t run_for(const chrono::duration<Rep, Period>& rel_time);
-
-  /// Run the io_context object's event processing loop until a specified time.
-  /**
-   * The run_until() function blocks until all work has finished and there are
-   * no more handlers to be dispatched, until the io_context has been stopped,
-   * or until the specified time has been reached.
-   *
-   * @param abs_time The time point until which the call may block.
-   *
-   * @return The number of handlers that were executed.
-   */
-  template <typename Clock, typename Duration>
-  std::size_t run_until(const chrono::time_point<Clock, Duration>& abs_time);
-#endif // defined(ASIO_HAS_CHRONO) || defined(GENERATING_DOCUMENTATION)
-
-  /// Run the io_context object's event processing loop to execute at most one
-  /// handler.
-  /**
-   * The run_one() function blocks until one handler has been dispatched, or
-   * until the io_context has been stopped.
-   *
-   * @return The number of handlers that were executed. A zero return value
-   * implies that the io_context object is stopped (the stopped() function
-   * returns @c true). Subsequent calls to run(), run_one(), poll() or
-   * poll_one() will return immediately unless there is a prior call to
-   * restart().
-   *
-   * @note Calling the run_one() function from a thread that is currently
-   * calling one of run(), run_one(), run_for(), run_until(), poll() or
-   * poll_one() on the same io_context object may introduce the potential for
-   * deadlock. It is the caller's reponsibility to avoid this.
-   */
-  ASIO_DECL count_type run_one();
-
-#if !defined(ASIO_NO_DEPRECATED)
-  /// (Deprecated: Use non-error_code overlaod.) Run the io_context object's
-  /// event processing loop to execute at most one handler.
-  /**
-   * The run_one() function blocks until one handler has been dispatched, or
-   * until the io_context has been stopped.
-   *
-   * @return The number of handlers that were executed. A zero return value
-   * implies that the io_context object is stopped (the stopped() function
-   * returns @c true). Subsequent calls to run(), run_one(), poll() or
-   * poll_one() will return immediately unless there is a prior call to
-   * restart().
-   *
-   * @return The number of handlers that were executed.
-   *
-   * @note Calling the run_one() function from a thread that is currently
-   * calling one of run(), run_one(), run_for(), run_until(), poll() or
-   * poll_one() on the same io_context object may introduce the potential for
-   * deadlock. It is the caller's reponsibility to avoid this.
-   */
-  ASIO_DECL count_type run_one(asio::error_code& ec);
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-#if defined(ASIO_HAS_CHRONO) || defined(GENERATING_DOCUMENTATION)
-  /// Run the io_context object's event processing loop for a specified duration
-  /// to execute at most one handler.
-  /**
-   * The run_one_for() function blocks until one handler has been dispatched,
-   * until the io_context has been stopped, or until the specified duration has
-   * elapsed.
-   *
-   * @param rel_time The duration for which the call may block.
-   *
-   * @return The number of handlers that were executed.
-   */
-  template <typename Rep, typename Period>
-  std::size_t run_one_for(const chrono::duration<Rep, Period>& rel_time);
-
-  /// Run the io_context object's event processing loop until a specified time
-  /// to execute at most one handler.
-  /**
-   * The run_one_until() function blocks until one handler has been dispatched,
-   * until the io_context has been stopped, or until the specified time has
-   * been reached.
-   *
-   * @param abs_time The time point until which the call may block.
-   *
-   * @return The number of handlers that were executed.
-   */
-  template <typename Clock, typename Duration>
-  std::size_t run_one_until(
-      const chrono::time_point<Clock, Duration>& abs_time);
-#endif // defined(ASIO_HAS_CHRONO) || defined(GENERATING_DOCUMENTATION)
-
-  /// Run the io_context object's event processing loop to execute ready
-  /// handlers.
-  /**
-   * The poll() function runs handlers that are ready to run, without blocking,
-   * until the io_context has been stopped or there are no more ready handlers.
-   *
-   * @return The number of handlers that were executed.
-   */
-  ASIO_DECL count_type poll();
-
-#if !defined(ASIO_NO_DEPRECATED)
-  /// (Deprecated: Use non-error_code overload.) Run the io_context object's
-  /// event processing loop to execute ready handlers.
-  /**
-   * The poll() function runs handlers that are ready to run, without blocking,
-   * until the io_context has been stopped or there are no more ready handlers.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @return The number of handlers that were executed.
-   */
-  ASIO_DECL count_type poll(asio::error_code& ec);
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-  /// Run the io_context object's event processing loop to execute one ready
-  /// handler.
-  /**
-   * The poll_one() function runs at most one handler that is ready to run,
-   * without blocking.
-   *
-   * @return The number of handlers that were executed.
-   */
-  ASIO_DECL count_type poll_one();
-
-#if !defined(ASIO_NO_DEPRECATED)
-  /// (Deprecated: Use non-error_code overload.) Run the io_context object's
-  /// event processing loop to execute one ready handler.
-  /**
-   * The poll_one() function runs at most one handler that is ready to run,
-   * without blocking.
-   *
-   * @param ec Set to indicate what error occurred, if any.
-   *
-   * @return The number of handlers that were executed.
-   */
-  ASIO_DECL count_type poll_one(asio::error_code& ec);
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-  /// Stop the io_context object's event processing loop.
-  /**
-   * This function does not block, but instead simply signals the io_context to
-   * stop. All invocations of its run() or run_one() member functions should
-   * return as soon as possible. Subsequent calls to run(), run_one(), poll()
-   * or poll_one() will return immediately until restart() is called.
-   */
-  ASIO_DECL void stop();
-
-  /// Determine whether the io_context object has been stopped.
-  /**
-   * This function is used to determine whether an io_context object has been
-   * stopped, either through an explicit call to stop(), or due to running out
-   * of work. When an io_context object is stopped, calls to run(), run_one(),
-   * poll() or poll_one() will return immediately without invoking any
-   * handlers.
-   *
-   * @return @c true if the io_context object is stopped, otherwise @c false.
-   */
-  ASIO_DECL bool stopped() const;
-
-  /// Restart the io_context in preparation for a subsequent run() invocation.
-  /**
-   * This function must be called prior to any second or later set of
-   * invocations of the run(), run_one(), poll() or poll_one() functions when a
-   * previous invocation of these functions returned due to the io_context
-   * being stopped or running out of work. After a call to restart(), the
-   * io_context object's stopped() function will return @c false.
-   *
-   * This function must not be called while there are any unfinished calls to
-   * the run(), run_one(), poll() or poll_one() functions.
-   */
-  ASIO_DECL void restart();
-
-#if !defined(ASIO_NO_DEPRECATED)
-  /// (Deprecated: Use restart().) Reset the io_context in preparation for a
-  /// subsequent run() invocation.
-  /**
-   * This function must be called prior to any second or later set of
-   * invocations of the run(), run_one(), poll() or poll_one() functions when a
-   * previous invocation of these functions returned due to the io_context
-   * being stopped or running out of work. After a call to restart(), the
-   * io_context object's stopped() function will return @c false.
-   *
-   * This function must not be called while there are any unfinished calls to
-   * the run(), run_one(), poll() or poll_one() functions.
-   */
-  void reset();
-
-  /// (Deprecated: Use asio::dispatch().) Request the io_context to
-  /// invoke the given handler.
-  /**
-   * This function is used to ask the io_context to execute the given handler.
-   *
-   * The io_context guarantees that the handler will only be called in a thread
-   * in which the run(), run_one(), poll() or poll_one() member functions is
-   * currently being invoked. The handler may be executed inside this function
-   * if the guarantee can be met.
-   *
-   * @param handler The handler to be called. The io_context will make
-   * a copy of the handler object as required. The function signature of the
-   * handler must be: @code void handler(); @endcode
-   *
-   * @note This function throws an exception only if:
-   *
-   * @li the handler's @c asio_handler_allocate function; or
-   *
-   * @li the handler's copy constructor
-   *
-   * throws an exception.
-   */
-  template <typename LegacyCompletionHandler>
-  ASIO_INITFN_RESULT_TYPE(LegacyCompletionHandler, void ())
-  dispatch(ASIO_MOVE_ARG(LegacyCompletionHandler) handler);
-
-  /// (Deprecated: Use asio::post().) Request the io_context to invoke
-  /// the given handler and return immediately.
-  /**
-   * This function is used to ask the io_context to execute the given handler,
-   * but without allowing the io_context to call the handler from inside this
-   * function.
-   *
-   * The io_context guarantees that the handler will only be called in a thread
-   * in which the run(), run_one(), poll() or poll_one() member functions is
-   * currently being invoked.
-   *
-   * @param handler The handler to be called. The io_context will make
-   * a copy of the handler object as required. The function signature of the
-   * handler must be: @code void handler(); @endcode
-   *
-   * @note This function throws an exception only if:
-   *
-   * @li the handler's @c asio_handler_allocate function; or
-   *
-   * @li the handler's copy constructor
-   *
-   * throws an exception.
-   */
-  template <typename LegacyCompletionHandler>
-  ASIO_INITFN_RESULT_TYPE(LegacyCompletionHandler, void ())
-  post(ASIO_MOVE_ARG(LegacyCompletionHandler) handler);
-
-  /// (Deprecated: Use asio::bind_executor().) Create a new handler that
-  /// automatically dispatches the wrapped handler on the io_context.
-  /**
-   * This function is used to create a new handler function object that, when
-   * invoked, will automatically pass the wrapped handler to the io_context
-   * object's dispatch function.
-   *
-   * @param handler The handler to be wrapped. The io_context will make a copy
-   * of the handler object as required. The function signature of the handler
-   * must be: @code void handler(A1 a1, ... An an); @endcode
-   *
-   * @return A function object that, when invoked, passes the wrapped handler to
-   * the io_context object's dispatch function. Given a function object with the
-   * signature:
-   * @code R f(A1 a1, ... An an); @endcode
-   * If this function object is passed to the wrap function like so:
-   * @code io_context.wrap(f); @endcode
-   * then the return value is a function object with the signature
-   * @code void g(A1 a1, ... An an); @endcode
-   * that, when invoked, executes code equivalent to:
-   * @code io_context.dispatch(boost::bind(f, a1, ... an)); @endcode
-   */
-  template <typename Handler>
-#if defined(GENERATING_DOCUMENTATION)
-  unspecified
-#else
-  detail::wrapped_handler<io_context&, Handler>
-#endif
-  wrap(Handler handler);
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-private:
-  // Helper function to add the implementation.
-  ASIO_DECL impl_type& add_impl(impl_type* impl);
-
-  // Backwards compatible overload for use with services derived from
-  // io_context::service.
-  template <typename Service>
-  friend Service& use_service(io_context& ioc);
-
-#if defined(ASIO_WINDOWS) || defined(__CYGWIN__)
-  detail::winsock_init<> init_;
-#elif defined(__sun) || defined(__QNX__) || defined(__hpux) || defined(_AIX) \
-  || defined(__osf__)
-  detail::signal_init<> init_;
-#endif
-
-  // The implementation.
-  impl_type& impl_;
-};
-
-/// Executor used to submit functions to an io_context.
-class io_context::executor_type
-{
-public:
-  /// Obtain the underlying execution context.
-  io_context& context() const ASIO_NOEXCEPT;
-
-  /// Inform the io_context that it has some outstanding work to do.
-  /**
-   * This function is used to inform the io_context that some work has begun.
-   * This ensures that the io_context's run() and run_one() functions do not
-   * exit while the work is underway.
-   */
-  void on_work_started() const ASIO_NOEXCEPT;
-
-  /// Inform the io_context that some work is no longer outstanding.
-  /**
-   * This function is used to inform the io_context that some work has
-   * finished. Once the count of unfinished work reaches zero, the io_context
-   * is stopped and the run() and run_one() functions may exit.
-   */
-  void on_work_finished() const ASIO_NOEXCEPT;
-
-  /// Request the io_context to invoke the given function object.
-  /**
-   * This function is used to ask the io_context to execute the given function
-   * object. If the current thread is running the io_context, @c dispatch()
-   * executes the function before returning. Otherwise, the function will be
-   * scheduled to run on the io_context.
-   *
-   * @param f The function object to be called. The executor will make a copy
-   * of the handler object as required. The function signature of the function
-   * object must be: @code void function(); @endcode
-   *
-   * @param a An allocator that may be used by the executor to allocate the
-   * internal storage needed for function invocation.
-   */
-  template <typename Function, typename Allocator>
-  void dispatch(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
-
-  /// Request the io_context to invoke the given function object.
-  /**
-   * This function is used to ask the io_context to execute the given function
-   * object. The function object will never be executed inside @c post().
-   * Instead, it will be scheduled to run on the io_context.
-   *
-   * @param f The function object to be called. The executor will make a copy
-   * of the handler object as required. The function signature of the function
-   * object must be: @code void function(); @endcode
-   *
-   * @param a An allocator that may be used by the executor to allocate the
-   * internal storage needed for function invocation.
-   */
-  template <typename Function, typename Allocator>
-  void post(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
-
-  /// Request the io_context to invoke the given function object.
-  /**
-   * This function is used to ask the io_context to execute the given function
-   * object. The function object will never be executed inside @c defer().
-   * Instead, it will be scheduled to run on the io_context.
-   *
-   * If the current thread belongs to the io_context, @c defer() will delay
-   * scheduling the function object until the current thread returns control to
-   * the pool.
-   *
-   * @param f The function object to be called. The executor will make a copy
-   * of the handler object as required. The function signature of the function
-   * object must be: @code void function(); @endcode
-   *
-   * @param a An allocator that may be used by the executor to allocate the
-   * internal storage needed for function invocation.
-   */
-  template <typename Function, typename Allocator>
-  void defer(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
-
-  /// Determine whether the io_context is running in the current thread.
-  /**
-   * @return @c true if the current thread is running the io_context. Otherwise
-   * returns @c false.
-   */
-  bool running_in_this_thread() const ASIO_NOEXCEPT;
-
-  /// Compare two executors for equality.
-  /**
-   * Two executors are equal if they refer to the same underlying io_context.
-   */
-  friend bool operator==(const executor_type& a,
-      const executor_type& b) ASIO_NOEXCEPT
-  {
-    return &a.io_context_ == &b.io_context_;
-  }
-
-  /// Compare two executors for inequality.
-  /**
-   * Two executors are equal if they refer to the same underlying io_context.
-   */
-  friend bool operator!=(const executor_type& a,
-      const executor_type& b) ASIO_NOEXCEPT
-  {
-    return &a.io_context_ != &b.io_context_;
-  }
-
-private:
-  friend class io_context;
-
-  // Constructor.
-  explicit executor_type(io_context& i) : io_context_(i) {}
-
-  // The underlying io_context.
-  io_context& io_context_;
-};
-
-#if !defined(ASIO_NO_DEPRECATED)
-/// (Deprecated: Use executor_work_guard.) Class to inform the io_context when
-/// it has work to do.
-/**
- * The work class is used to inform the io_context when work starts and
- * finishes. This ensures that the io_context object's run() function will not
- * exit while work is underway, and that it does exit when there is no
- * unfinished work remaining.
- *
- * The work class is copy-constructible so that it may be used as a data member
- * in a handler class. It is not assignable.
- */
-class io_context::work
-{
-public:
-  /// Constructor notifies the io_context that work is starting.
-  /**
-   * The constructor is used to inform the io_context that some work has begun.
-   * This ensures that the io_context object's run() function will not exit
-   * while the work is underway.
-   */
-  explicit work(asio::io_context& io_context);
-
-  /// Copy constructor notifies the io_context that work is starting.
-  /**
-   * The constructor is used to inform the io_context that some work has begun.
-   * This ensures that the io_context object's run() function will not exit
-   * while the work is underway.
-   */
-  work(const work& other);
-
-  /// Destructor notifies the io_context that the work is complete.
-  /**
-   * The destructor is used to inform the io_context that some work has
-   * finished. Once the count of unfinished work reaches zero, the io_context
-   * object's run() function is permitted to exit.
-   */
-  ~work();
-
-  /// Get the io_context associated with the work.
-  asio::io_context& get_io_context();
-
-  /// (Deprecated: Use get_io_context().) Get the io_context associated with the
-  /// work.
-  asio::io_context& get_io_service();
-
-private:
-  // Prevent assignment.
-  void operator=(const work& other);
-
-  // The io_context implementation.
-  detail::io_context_impl& io_context_impl_;
-};
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-/// Base class for all io_context services.
-class io_context::service
-  : public execution_context::service
-{
-public:
-  /// Get the io_context object that owns the service.
-  asio::io_context& get_io_context();
-
-#if !defined(ASIO_NO_DEPRECATED)
-  /// Get the io_context object that owns the service.
-  asio::io_context& get_io_service();
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-private:
-  /// Destroy all user-defined handler objects owned by the service.
-  ASIO_DECL virtual void shutdown();
-
-#if !defined(ASIO_NO_DEPRECATED)
-  /// (Deprecated: Use shutdown().) Destroy all user-defined handler objects
-  /// owned by the service.
-  ASIO_DECL virtual void shutdown_service();
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-  /// Handle notification of a fork-related event to perform any necessary
-  /// housekeeping.
-  /**
-   * This function is not a pure virtual so that services only have to
-   * implement it if necessary. The default implementation does nothing.
-   */
-  ASIO_DECL virtual void notify_fork(
-      execution_context::fork_event event);
-
-#if !defined(ASIO_NO_DEPRECATED)
-  /// (Deprecated: Use notify_fork().) Handle notification of a fork-related
-  /// event to perform any necessary housekeeping.
-  /**
-   * This function is not a pure virtual so that services only have to
-   * implement it if necessary. The default implementation does nothing.
-   */
-  ASIO_DECL virtual void fork_service(
-      execution_context::fork_event event);
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-protected:
-  /// Constructor.
-  /**
-   * @param owner The io_context object that owns the service.
-   */
-  ASIO_DECL service(asio::io_context& owner);
-
-  /// Destructor.
-  ASIO_DECL virtual ~service();
-};
-
-namespace detail {
-
-// Special service base class to keep classes header-file only.
-template <typename Type>
-class service_base
-  : public asio::io_context::service
-{
-public:
-  static asio::detail::service_id<Type> id;
-
-  // Constructor.
-  service_base(asio::io_context& io_context)
-    : asio::io_context::service(io_context)
-  {
-  }
-};
-
-template <typename Type>
-asio::detail::service_id<Type> service_base<Type>::id;
-
-} // namespace detail
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#include "asio/impl/io_context.hpp"
-#if defined(ASIO_HEADER_ONLY)
-# include "asio/impl/io_context.ipp"
-#endif // defined(ASIO_HEADER_ONLY)
-
-// If both io_context.hpp and strand.hpp have been included, automatically
-// include the header file needed for the io_context::strand class.
-#if !defined(ASIO_NO_EXTENSIONS)
-# if defined(ASIO_STRAND_HPP)
-#  include "asio/io_context_strand.hpp"
-# endif // defined(ASIO_STRAND_HPP)
-#endif // !defined(ASIO_NO_EXTENSIONS)
-
-#endif // ASIO_IO_CONTEXT_HPP