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diff --git a/lib/asio/thread_pool.hpp b/lib/asio/thread_pool.hpp
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--- a/lib/asio/thread_pool.hpp
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-//
-// thread_pool.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_THREAD_POOL_HPP
-#define ASIO_THREAD_POOL_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include "asio/detail/noncopyable.hpp"
-#include "asio/detail/scheduler.hpp"
-#include "asio/detail/thread_group.hpp"
-#include "asio/execution_context.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-/// A simple fixed-size thread pool.
-/**
- * The thread pool class is an execution context where functions are permitted
- * to run on one of a fixed number of threads.
- *
- * @par Submitting tasks to the pool
- *
- * 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()
- * {
- *   ...
- * }
- *
- * ...
- *
- * // Launch the pool with four threads.
- * asio::thread_pool pool(4);
- *
- * // Submit a function to the pool.
- * asio::post(pool, my_task);
- *
- * // Submit a lambda object to the pool.
- * asio::post(pool,
- *     []()
- *     {
- *       ...
- *     });
- *
- * // Wait for all tasks in the pool to complete.
- * pool.join(); @endcode
- */
-class thread_pool
-  : public execution_context
-{
-public:
-  class executor_type;
-
-  /// Constructs a pool with an automatically determined number of threads.
-  ASIO_DECL thread_pool();
-
-  /// Constructs a pool with a specified number of threads.
-  ASIO_DECL thread_pool(std::size_t num_threads);
-
-  /// Destructor.
-  /**
-   * Automatically stops and joins the pool, if not explicitly done beforehand.
-   */
-  ASIO_DECL ~thread_pool();
-
-  /// Obtains the executor associated with the pool.
-  executor_type get_executor() ASIO_NOEXCEPT;
-
-  /// Stops the threads.
-  /**
-   * This function stops the threads as soon as possible. As a result of calling
-   * @c stop(), pending function objects may be never be invoked.
-   */
-  ASIO_DECL void stop();
-
-  /// Joins the threads.
-  /**
-   * This function blocks until the threads in the pool have completed. If @c
-   * stop() is not called prior to @c join(), the @c join() call will wait
-   * until the pool has no more outstanding work.
-   */
-  ASIO_DECL void join();
-
-private:
-  friend class executor_type;
-  struct thread_function;
-
-  // The underlying scheduler.
-  detail::scheduler& scheduler_;
-
-  // The threads in the pool.
-  detail::thread_group threads_;
-};
-
-/// Executor used to submit functions to a thread pool.
-class thread_pool::executor_type
-{
-public:
-  /// Obtain the underlying execution context.
-  thread_pool& context() const ASIO_NOEXCEPT;
-
-  /// Inform the thread pool that it has some outstanding work to do.
-  /**
-   * This function is used to inform the thread pool that some work has begun.
-   * This ensures that the thread pool's join() function will not return while
-   * the work is underway.
-   */
-  void on_work_started() const ASIO_NOEXCEPT;
-
-  /// Inform the thread pool that some work is no longer outstanding.
-  /**
-   * This function is used to inform the thread pool that some work has
-   * finished. Once the count of unfinished work reaches zero, the thread
-   * pool's join() function is permitted to exit.
-   */
-  void on_work_finished() const ASIO_NOEXCEPT;
-
-  /// Request the thread pool to invoke the given function object.
-  /**
-   * This function is used to ask the thread pool to execute the given function
-   * object. If the current thread belongs to the pool, @c dispatch() executes
-   * the function before returning. Otherwise, the function will be scheduled
-   * to run on the thread 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 dispatch(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
-
-  /// Request the thread pool to invoke the given function object.
-  /**
-   * This function is used to ask the thread pool 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 thread 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 post(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
-
-  /// Request the thread pool to invoke the given function object.
-  /**
-   * This function is used to ask the thread pool 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 thread pool.
-   *
-   * If the current thread belongs to the thread pool, @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 thread pool is running in the current thread.
-  /**
-   * @return @c true if the current thread belongs to the pool. 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 thread pool.
-   */
-  friend bool operator==(const executor_type& a,
-      const executor_type& b) ASIO_NOEXCEPT
-  {
-    return &a.pool_ == &b.pool_;
-  }
-
-  /// Compare two executors for inequality.
-  /**
-   * Two executors are equal if they refer to the same underlying thread pool.
-   */
-  friend bool operator!=(const executor_type& a,
-      const executor_type& b) ASIO_NOEXCEPT
-  {
-    return &a.pool_ != &b.pool_;
-  }
-
-private:
-  friend class thread_pool;
-
-  // Constructor.
-  explicit executor_type(thread_pool& p) : pool_(p) {}
-
-  // The underlying thread pool.
-  thread_pool& pool_;
-};
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#include "asio/impl/thread_pool.hpp"
-#if defined(ASIO_HEADER_ONLY)
-# include "asio/impl/thread_pool.ipp"
-#endif // defined(ASIO_HEADER_ONLY)
-
-#endif // ASIO_THREAD_POOL_HPP