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diff --git a/lib/asio/io_context_strand.hpp b/lib/asio/io_context_strand.hpp
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--- a/lib/asio/io_context_strand.hpp
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-//
-// io_context_strand.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_STRAND_HPP
-#define ASIO_IO_CONTEXT_STRAND_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_NO_EXTENSIONS)
-
-#include "asio/async_result.hpp"
-#include "asio/detail/handler_type_requirements.hpp"
-#include "asio/detail/strand_service.hpp"
-#include "asio/detail/wrapped_handler.hpp"
-#include "asio/io_context.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-/// Provides serialised handler execution.
-/**
- * The io_context::strand class provides the ability to post and dispatch
- * handlers with the guarantee that none of those handlers will execute
- * concurrently.
- *
- * @par Order of handler invocation
- * Given:
- *
- * @li a strand object @c s
- *
- * @li an object @c a meeting completion handler requirements
- *
- * @li an object @c a1 which is an arbitrary copy of @c a made by the
- * implementation
- *
- * @li an object @c b meeting completion handler requirements
- *
- * @li an object @c b1 which is an arbitrary copy of @c b made by the
- * implementation
- *
- * if any of the following conditions are true:
- *
- * @li @c s.post(a) happens-before @c s.post(b)
- * 
- * @li @c s.post(a) happens-before @c s.dispatch(b), where the latter is
- * performed outside the strand
- * 
- * @li @c s.dispatch(a) happens-before @c s.post(b), where the former is
- * performed outside the strand
- * 
- * @li @c s.dispatch(a) happens-before @c s.dispatch(b), where both are
- * performed outside the strand
- *   
- * then @c asio_handler_invoke(a1, &a1) happens-before
- * @c asio_handler_invoke(b1, &b1).
- * 
- * Note that in the following case:
- * @code async_op_1(..., s.wrap(a));
- * async_op_2(..., s.wrap(b)); @endcode
- * the completion of the first async operation will perform @c s.dispatch(a),
- * and the second will perform @c s.dispatch(b), but the order in which those
- * are performed is unspecified. That is, you cannot state whether one
- * happens-before the other. Therefore none of the above conditions are met and
- * no ordering guarantee is made.
- *
- * @note The implementation makes no guarantee that handlers posted or
- * dispatched through different @c strand objects will be invoked concurrently.
- *
- * @par Thread Safety
- * @e Distinct @e objects: Safe.@n
- * @e Shared @e objects: Safe.
- *
- * @par Concepts:
- * Dispatcher.
- */
-class io_context::strand
-{
-public:
-  /// Constructor.
-  /**
-   * Constructs the strand.
-   *
-   * @param io_context The io_context object that the strand will use to
-   * dispatch handlers that are ready to be run.
-   */
-  explicit strand(asio::io_context& io_context)
-    : service_(asio::use_service<
-        asio::detail::strand_service>(io_context))
-  {
-    service_.construct(impl_);
-  }
-
-  /// Destructor.
-  /**
-   * Destroys a strand.
-   *
-   * Handlers posted through the strand that have not yet been invoked will
-   * still be dispatched in a way that meets the guarantee of non-concurrency.
-   */
-  ~strand()
-  {
-  }
-
-#if !defined(ASIO_NO_DEPRECATED)
-  /// (Deprecated: Use context().) Get the io_context associated with the
-  /// strand.
-  /**
-   * This function may be used to obtain the io_context object that the strand
-   * uses to dispatch handlers for asynchronous operations.
-   *
-   * @return A reference to the io_context object that the strand will use to
-   * dispatch handlers. Ownership is not transferred to the caller.
-   */
-  asio::io_context& get_io_context()
-  {
-    return service_.get_io_context();
-  }
-
-  /// (Deprecated: Use context().) Get the io_context associated with the
-  /// strand.
-  /**
-   * This function may be used to obtain the io_context object that the strand
-   * uses to dispatch handlers for asynchronous operations.
-   *
-   * @return A reference to the io_context object that the strand will use to
-   * dispatch handlers. Ownership is not transferred to the caller.
-   */
-  asio::io_context& get_io_service()
-  {
-    return service_.get_io_context();
-  }
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-  /// Obtain the underlying execution context.
-  asio::io_context& context() const ASIO_NOEXCEPT
-  {
-    return service_.get_io_context();
-  }
-
-  /// Inform the strand that it has some outstanding work to do.
-  /**
-   * The strand delegates this call to its underlying io_context.
-   */
-  void on_work_started() const ASIO_NOEXCEPT
-  {
-    context().get_executor().on_work_started();
-  }
-
-  /// Inform the strand that some work is no longer outstanding.
-  /**
-   * The strand delegates this call to its underlying io_context.
-   */
-  void on_work_finished() const ASIO_NOEXCEPT
-  {
-    context().get_executor().on_work_finished();
-  }
-
-  /// Request the strand to invoke the given function object.
-  /**
-   * This function is used to ask the strand to execute the given function
-   * object on its underlying io_context. The function object will be executed
-   * inside this function if the strand is not otherwise busy and if the
-   * underlying io_context's executor's @c dispatch() function is also able to
-   * execute the function before returning.
-   *
-   * @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
-  {
-    typename decay<Function>::type tmp(ASIO_MOVE_CAST(Function)(f));
-    service_.dispatch(impl_, tmp);
-    (void)a;
-  }
-
-#if !defined(ASIO_NO_DEPRECATED)
-  /// (Deprecated: Use asio::dispatch().) Request the strand to invoke
-  /// the given handler.
-  /**
-   * This function is used to ask the strand to execute the given handler.
-   *
-   * The strand object guarantees that handlers posted or dispatched through
-   * the strand will not be executed concurrently. The handler may be executed
-   * inside this function if the guarantee can be met. If this function is
-   * called from within a handler that was posted or dispatched through the same
-   * strand, then the new handler will be executed immediately.
-   *
-   * The strand's guarantee is in addition to the guarantee provided by the
-   * underlying io_context. The io_context guarantees that the handler will only
-   * be called in a thread in which the io_context's run member function is
-   * currently being invoked.
-   *
-   * @param handler The handler to be called. The strand will make a copy of the
-   * handler object as required. The function signature of the handler must be:
-   * @code void handler(); @endcode
-   */
-  template <typename LegacyCompletionHandler>
-  ASIO_INITFN_RESULT_TYPE(LegacyCompletionHandler, void ())
-  dispatch(ASIO_MOVE_ARG(LegacyCompletionHandler) handler)
-  {
-    // If you get an error on the following line it means that your handler does
-    // not meet the documented type requirements for a LegacyCompletionHandler.
-    ASIO_LEGACY_COMPLETION_HANDLER_CHECK(
-        LegacyCompletionHandler, handler) type_check;
-
-    async_completion<LegacyCompletionHandler, void ()> init(handler);
-
-    service_.dispatch(impl_, init.completion_handler);
-
-    return init.result.get();
-  }
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-  /// Request the strand to invoke the given function object.
-  /**
-   * This function is used to ask the executor to execute the given function
-   * object. The function object will never be executed inside this function.
-   * Instead, it will be scheduled to run by the underlying 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
-  {
-    typename decay<Function>::type tmp(ASIO_MOVE_CAST(Function)(f));
-    service_.post(impl_, tmp);
-    (void)a;
-  }
-
-#if !defined(ASIO_NO_DEPRECATED)
-  /// (Deprecated: Use asio::post().) Request the strand to invoke the
-  /// given handler and return immediately.
-  /**
-   * This function is used to ask the strand to execute the given handler, but
-   * without allowing the strand to call the handler from inside this function.
-   *
-   * The strand object guarantees that handlers posted or dispatched through
-   * the strand will not be executed concurrently. The strand's guarantee is in
-   * addition to the guarantee provided by the underlying io_context. The
-   * io_context guarantees that the handler will only be called in a thread in
-   * which the io_context's run member function is currently being invoked.
-   *
-   * @param handler The handler to be called. The strand will make a copy of the
-   * handler object as required. The function signature of the handler must be:
-   * @code void handler(); @endcode
-   */
-  template <typename LegacyCompletionHandler>
-  ASIO_INITFN_RESULT_TYPE(LegacyCompletionHandler, void ())
-  post(ASIO_MOVE_ARG(LegacyCompletionHandler) handler)
-  {
-    // If you get an error on the following line it means that your handler does
-    // not meet the documented type requirements for a LegacyCompletionHandler.
-    ASIO_LEGACY_COMPLETION_HANDLER_CHECK(
-        LegacyCompletionHandler, handler) type_check;
-
-    async_completion<LegacyCompletionHandler, void ()> init(handler);
-
-    service_.post(impl_, init.completion_handler);
-
-    return init.result.get();
-  }
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-  /// Request the strand to invoke the given function object.
-  /**
-   * This function is used to ask the executor to execute the given function
-   * object. The function object will never be executed inside this function.
-   * Instead, it will be scheduled to run by the underlying 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 defer(ASIO_MOVE_ARG(Function) f, const Allocator& a) const
-  {
-    typename decay<Function>::type tmp(ASIO_MOVE_CAST(Function)(f));
-    service_.post(impl_, tmp);
-    (void)a;
-  }
-
-#if !defined(ASIO_NO_DEPRECATED)
-  /// (Deprecated: Use asio::bind_executor().) Create a new handler that
-  /// automatically dispatches the wrapped handler on the strand.
-  /**
-   * This function is used to create a new handler function object that, when
-   * invoked, will automatically pass the wrapped handler to the strand's
-   * dispatch function.
-   *
-   * @param handler The handler to be wrapped. The strand 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 strand'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 strand.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 strand.dispatch(boost::bind(f, a1, ... an)); @endcode
-   */
-  template <typename Handler>
-#if defined(GENERATING_DOCUMENTATION)
-  unspecified
-#else
-  detail::wrapped_handler<strand, Handler, detail::is_continuation_if_running>
-#endif
-  wrap(Handler handler)
-  {
-    return detail::wrapped_handler<io_context::strand, Handler,
-        detail::is_continuation_if_running>(*this, handler);
-  }
-#endif // !defined(ASIO_NO_DEPRECATED)
-
-  /// Determine whether the strand is running in the current thread.
-  /**
-   * @return @c true if the current thread is executing a handler that was
-   * submitted to the strand using post(), dispatch() or wrap(). Otherwise
-   * returns @c false.
-   */
-  bool running_in_this_thread() const ASIO_NOEXCEPT
-  {
-    return service_.running_in_this_thread(impl_);
-  }
-
-  /// Compare two strands for equality.
-  /**
-   * Two strands are equal if they refer to the same ordered, non-concurrent
-   * state.
-   */
-  friend bool operator==(const strand& a, const strand& b) ASIO_NOEXCEPT
-  {
-    return a.impl_ == b.impl_;
-  }
-
-  /// Compare two strands for inequality.
-  /**
-   * Two strands are equal if they refer to the same ordered, non-concurrent
-   * state.
-   */
-  friend bool operator!=(const strand& a, const strand& b) ASIO_NOEXCEPT
-  {
-    return a.impl_ != b.impl_;
-  }
-
-private:
-  asio::detail::strand_service& service_;
-  mutable asio::detail::strand_service::implementation_type impl_;
-};
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // !defined(ASIO_NO_EXTENSIONS)
-
-#endif // ASIO_IO_CONTEXT_STRAND_HPP