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diff --git a/lib/asio/strand.hpp b/lib/asio/strand.hpp
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+++ b/lib/asio/strand.hpp
@@ -0,0 +1,286 @@
+//
+// 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_STRAND_HPP
+#define ASIO_STRAND_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/strand_executor_service.hpp"
+#include "asio/detail/type_traits.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+/// Provides serialised function invocation for any executor type.
+template <typename Executor>
+class strand
+{
+public:
+  /// The type of the underlying executor.
+  typedef Executor inner_executor_type;
+
+  /// Default constructor.
+  /**
+   * This constructor is only valid if the underlying executor type is default
+   * constructible.
+   */
+  strand()
+    : executor_(),
+      impl_(use_service<detail::strand_executor_service>(
+            executor_.context()).create_implementation())
+  {
+  }
+
+  /// Construct a strand for the specified executor.
+  explicit strand(const Executor& e)
+    : executor_(e),
+      impl_(use_service<detail::strand_executor_service>(
+            executor_.context()).create_implementation())
+  {
+  }
+
+  /// Copy constructor.
+  strand(const strand& other) ASIO_NOEXCEPT
+    : executor_(other.executor_),
+      impl_(other.impl_)
+  {
+  }
+
+  /// Converting constructor.
+  /**
+   * This constructor is only valid if the @c OtherExecutor type is convertible
+   * to @c Executor.
+   */
+  template <class OtherExecutor>
+  strand(
+      const strand<OtherExecutor>& other) ASIO_NOEXCEPT
+    : executor_(other.executor_),
+      impl_(other.impl_)
+  {
+  }
+
+  /// Assignment operator.
+  strand& operator=(const strand& other) ASIO_NOEXCEPT
+  {
+    executor_ = other.executor_;
+    impl_ = other.impl_;
+    return *this;
+  }
+
+  /// Converting assignment operator.
+  /**
+   * This assignment operator is only valid if the @c OtherExecutor type is
+   * convertible to @c Executor.
+   */
+  template <class OtherExecutor>
+  strand& operator=(
+      const strand<OtherExecutor>& other) ASIO_NOEXCEPT
+  {
+    executor_ = other.executor_;
+    impl_ = other.impl_;
+    return *this;
+  }
+
+#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move constructor.
+  strand(strand&& other) ASIO_NOEXCEPT
+    : executor_(ASIO_MOVE_CAST(Executor)(other.executor_)),
+      impl_(ASIO_MOVE_CAST(implementation_type)(other.impl_))
+  {
+  }
+
+  /// Converting move constructor.
+  /**
+   * This constructor is only valid if the @c OtherExecutor type is convertible
+   * to @c Executor.
+   */
+  template <class OtherExecutor>
+  strand(strand<OtherExecutor>&& other) ASIO_NOEXCEPT
+    : executor_(ASIO_MOVE_CAST(OtherExecutor)(other)),
+      impl_(ASIO_MOVE_CAST(implementation_type)(other.impl_))
+  {
+  }
+
+  /// Move assignment operator.
+  strand& operator=(strand&& other) ASIO_NOEXCEPT
+  {
+    executor_ = ASIO_MOVE_CAST(Executor)(other);
+    impl_ = ASIO_MOVE_CAST(implementation_type)(other.impl_);
+    return *this;
+  }
+
+  /// Converting move assignment operator.
+  /**
+   * This assignment operator is only valid if the @c OtherExecutor type is
+   * convertible to @c Executor.
+   */
+  template <class OtherExecutor>
+  strand& operator=(
+      const strand<OtherExecutor>&& other) ASIO_NOEXCEPT
+  {
+    executor_ = ASIO_MOVE_CAST(OtherExecutor)(other);
+    impl_ = ASIO_MOVE_CAST(implementation_type)(other.impl_);
+    return *this;
+  }
+#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Destructor.
+  ~strand()
+  {
+  }
+
+  /// Obtain the underlying executor.
+  inner_executor_type get_inner_executor() const ASIO_NOEXCEPT
+  {
+    return executor_;
+  }
+
+  /// Obtain the underlying execution context.
+  execution_context& context() const ASIO_NOEXCEPT
+  {
+    return executor_.context();
+  }
+
+  /// Inform the strand that it has some outstanding work to do.
+  /**
+   * The strand delegates this call to its underlying executor.
+   */
+  void on_work_started() const ASIO_NOEXCEPT
+  {
+    executor_.on_work_started();
+  }
+
+  /// Inform the strand that some work is no longer outstanding.
+  /**
+   * The strand delegates this call to its underlying executor.
+   */
+  void on_work_finished() const ASIO_NOEXCEPT
+  {
+    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 executor. The function object will be executed
+   * inside this function if the strand is not otherwise busy and if the
+   * underlying 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
+  {
+    detail::strand_executor_service::dispatch(impl_,
+        executor_, ASIO_MOVE_CAST(Function)(f), a);
+  }
+
+  /// 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 by the underlying executor's defer function.
+   *
+   * @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
+  {
+    detail::strand_executor_service::post(impl_,
+        executor_, ASIO_MOVE_CAST(Function)(f), a);
+  }
+
+  /// 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 by the underlying executor's defer function.
+   *
+   * @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
+  {
+    detail::strand_executor_service::defer(impl_,
+        executor_, ASIO_MOVE_CAST(Function)(f), a);
+  }
+
+  /// Determine whether the strand is running in the current thread.
+  /**
+   * @return @c true if the current thread is executing a function that was
+   * submitted to the strand using post(), dispatch() or defer(). Otherwise
+   * returns @c false.
+   */
+  bool running_in_this_thread() const ASIO_NOEXCEPT
+  {
+    return detail::strand_executor_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:
+  Executor executor_;
+  typedef detail::strand_executor_service::implementation_type
+    implementation_type;
+  implementation_type impl_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+// 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_IO_CONTEXT_HPP)
+#  include "asio/io_context_strand.hpp"
+# endif // defined(ASIO_IO_CONTEXT_HPP)
+#endif // !defined(ASIO_NO_EXTENSIONS)
+
+#endif // ASIO_STRAND_HPP