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diff --git a/lib/asio/detail/win_iocp_overlapped_ptr.hpp b/lib/asio/detail/win_iocp_overlapped_ptr.hpp
new file mode 100644
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+++ b/lib/asio/detail/win_iocp_overlapped_ptr.hpp
@@ -0,0 +1,143 @@
+//
+// detail/win_iocp_overlapped_ptr.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_WIN_IOCP_OVERLAPPED_PTR_HPP
+#define ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_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_HAS_IOCP)
+
+#include "asio/io_context.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/memory.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/win_iocp_overlapped_op.hpp"
+#include "asio/detail/win_iocp_io_context.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+// Wraps a handler to create an OVERLAPPED object for use with overlapped I/O.
+class win_iocp_overlapped_ptr
+  : private noncopyable
+{
+public:
+  // Construct an empty win_iocp_overlapped_ptr.
+  win_iocp_overlapped_ptr()
+    : ptr_(0),
+      iocp_service_(0)
+  {
+  }
+
+  // Construct an win_iocp_overlapped_ptr to contain the specified handler.
+  template <typename Handler>
+  explicit win_iocp_overlapped_ptr(
+      asio::io_context& io_context, ASIO_MOVE_ARG(Handler) handler)
+    : ptr_(0),
+      iocp_service_(0)
+  {
+    this->reset(io_context, ASIO_MOVE_CAST(Handler)(handler));
+  }
+
+  // Destructor automatically frees the OVERLAPPED object unless released.
+  ~win_iocp_overlapped_ptr()
+  {
+    reset();
+  }
+
+  // Reset to empty.
+  void reset()
+  {
+    if (ptr_)
+    {
+      ptr_->destroy();
+      ptr_ = 0;
+      iocp_service_->work_finished();
+      iocp_service_ = 0;
+    }
+  }
+
+  // Reset to contain the specified handler, freeing any current OVERLAPPED
+  // object.
+  template <typename Handler>
+  void reset(asio::io_context& io_context, Handler handler)
+  {
+    typedef win_iocp_overlapped_op<Handler> op;
+    typename op::ptr p = { asio::detail::addressof(handler),
+      op::ptr::allocate(handler), 0 };
+    p.p = new (p.v) op(handler);
+
+    ASIO_HANDLER_CREATION((io_context, *p.p,
+          "io_context", &io_context.impl_, 0, "overlapped"));
+
+    io_context.impl_.work_started();
+    reset();
+    ptr_ = p.p;
+    p.v = p.p = 0;
+    iocp_service_ = &io_context.impl_;
+  }
+
+  // Get the contained OVERLAPPED object.
+  OVERLAPPED* get()
+  {
+    return ptr_;
+  }
+
+  // Get the contained OVERLAPPED object.
+  const OVERLAPPED* get() const
+  {
+    return ptr_;
+  }
+
+  // Release ownership of the OVERLAPPED object.
+  OVERLAPPED* release()
+  {
+    if (ptr_)
+      iocp_service_->on_pending(ptr_);
+
+    OVERLAPPED* tmp = ptr_;
+    ptr_ = 0;
+    iocp_service_ = 0;
+    return tmp;
+  }
+
+  // Post completion notification for overlapped operation. Releases ownership.
+  void complete(const asio::error_code& ec,
+      std::size_t bytes_transferred)
+  {
+    if (ptr_)
+    {
+      iocp_service_->on_completion(ptr_, ec,
+          static_cast<DWORD>(bytes_transferred));
+      ptr_ = 0;
+      iocp_service_ = 0;
+    }
+  }
+
+private:
+  win_iocp_operation* ptr_;
+  win_iocp_io_context* iocp_service_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_HAS_IOCP)
+
+#endif // ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_HPP