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diff --git a/lib/asio/detail/win_iocp_handle_write_op.hpp b/lib/asio/detail/win_iocp_handle_write_op.hpp
new file mode 100644
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+++ b/lib/asio/detail/win_iocp_handle_write_op.hpp
@@ -0,0 +1,103 @@
+//
+// detail/win_iocp_handle_write_op.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.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_HANDLE_WRITE_OP_HPP
+#define ASIO_DETAIL_WIN_IOCP_HANDLE_WRITE_OP_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/error.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/buffer_sequence_adapter.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/memory.hpp"
+#include "asio/detail/operation.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename ConstBufferSequence, typename Handler>
+class win_iocp_handle_write_op : public operation
+{
+public:
+  ASIO_DEFINE_HANDLER_PTR(win_iocp_handle_write_op);
+
+  win_iocp_handle_write_op(const ConstBufferSequence& buffers, Handler& handler)
+    : operation(&win_iocp_handle_write_op::do_complete),
+      buffers_(buffers),
+      handler_(ASIO_MOVE_CAST(Handler)(handler))
+  {
+    handler_work<Handler>::start(handler_);
+  }
+
+  static void do_complete(void* owner, operation* base,
+      const asio::error_code& ec, std::size_t bytes_transferred)
+  {
+    // Take ownership of the operation object.
+    win_iocp_handle_write_op* o(static_cast<win_iocp_handle_write_op*>(base));
+    ptr p = { asio::detail::addressof(o->handler_), o, o };
+    handler_work<Handler> w(o->handler_);
+
+    ASIO_HANDLER_COMPLETION((*o));
+
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+    if (owner)
+    {
+      // Check whether buffers are still valid.
+      buffer_sequence_adapter<asio::const_buffer,
+          ConstBufferSequence>::validate(o->buffers_);
+    }
+#endif // defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+
+    // Make a copy of the handler so that the memory can be deallocated before
+    // the upcall is made. Even if we're not about to make an upcall, a
+    // sub-object of the handler may be the true owner of the memory associated
+    // with the handler. Consequently, a local copy of the handler is required
+    // to ensure that any owning sub-object remains valid until after we have
+    // deallocated the memory here.
+    detail::binder2<Handler, asio::error_code, std::size_t>
+      handler(o->handler_, ec, bytes_transferred);
+    p.h = asio::detail::addressof(handler.handler_);
+    p.reset();
+
+    // Make the upcall if required.
+    if (owner)
+    {
+      fenced_block b(fenced_block::half);
+      ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
+      w.complete(handler, handler.handler_);
+      ASIO_HANDLER_INVOCATION_END;
+    }
+  }
+
+private:
+  ConstBufferSequence buffers_;
+  Handler handler_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_HAS_IOCP)
+
+#endif // ASIO_DETAIL_WIN_IOCP_HANDLE_WRITE_OP_HPP