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diff --git a/src/third_party/boost-1.56.0/boost/asio/detail/win_iocp_socket_send_op.hpp b/src/third_party/boost-1.56.0/boost/asio/detail/win_iocp_socket_send_op.hpp
deleted file mode 100644
index ef25b88b50c..00000000000
--- a/src/third_party/boost-1.56.0/boost/asio/detail/win_iocp_socket_send_op.hpp
+++ /dev/null
@@ -1,111 +0,0 @@
-//
-// detail/win_iocp_socket_send_op.hpp
-// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2014 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 BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_SEND_OP_HPP
-#define BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_SEND_OP_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include <boost/asio/detail/config.hpp>
-
-#if defined(BOOST_ASIO_HAS_IOCP)
-
-#include <boost/asio/detail/addressof.hpp>
-#include <boost/asio/detail/bind_handler.hpp>
-#include <boost/asio/detail/buffer_sequence_adapter.hpp>
-#include <boost/asio/detail/fenced_block.hpp>
-#include <boost/asio/detail/handler_alloc_helpers.hpp>
-#include <boost/asio/detail/handler_invoke_helpers.hpp>
-#include <boost/asio/detail/operation.hpp>
-#include <boost/asio/detail/socket_ops.hpp>
-#include <boost/asio/error.hpp>
-
-#include <boost/asio/detail/push_options.hpp>
-
-namespace boost {
-namespace asio {
-namespace detail {
-
-template <typename ConstBufferSequence, typename Handler>
-class win_iocp_socket_send_op : public operation
-{
-public:
- BOOST_ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_send_op);
-
- win_iocp_socket_send_op(socket_ops::weak_cancel_token_type cancel_token,
- const ConstBufferSequence& buffers, Handler& handler)
- : operation(&win_iocp_socket_send_op::do_complete),
- cancel_token_(cancel_token),
- buffers_(buffers),
- handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler))
- {
- }
-
- static void do_complete(io_service_impl* owner, operation* base,
- const boost::system::error_code& result_ec,
- std::size_t bytes_transferred)
- {
- boost::system::error_code ec(result_ec);
-
- // Take ownership of the operation object.
- win_iocp_socket_send_op* o(static_cast<win_iocp_socket_send_op*>(base));
- ptr p = { boost::asio::detail::addressof(o->handler_), o, o };
-
- BOOST_ASIO_HANDLER_COMPLETION((o));
-
-#if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
- // Check whether buffers are still valid.
- if (owner)
- {
- buffer_sequence_adapter<boost::asio::const_buffer,
- ConstBufferSequence>::validate(o->buffers_);
- }
-#endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
-
- socket_ops::complete_iocp_send(o->cancel_token_, ec);
-
- // 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, boost::system::error_code, std::size_t>
- handler(o->handler_, ec, bytes_transferred);
- p.h = boost::asio::detail::addressof(handler.handler_);
- p.reset();
-
- // Make the upcall if required.
- if (owner)
- {
- fenced_block b(fenced_block::half);
- BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
- boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
- BOOST_ASIO_HANDLER_INVOCATION_END;
- }
- }
-
-private:
- socket_ops::weak_cancel_token_type cancel_token_;
- ConstBufferSequence buffers_;
- Handler handler_;
-};
-
-} // namespace detail
-} // namespace asio
-} // namespace boost
-
-#include <boost/asio/detail/pop_options.hpp>
-
-#endif // defined(BOOST_ASIO_HAS_IOCP)
-
-#endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_SEND_OP_HPP