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diff --git a/boost/asio/impl/io_context.ipp b/boost/asio/impl/io_context.ipp
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+++ b/boost/asio/impl/io_context.ipp
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+//
+// impl/io_context.ipp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2017 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_IMPL_IO_CONTEXT_IPP
+#define BOOST_ASIO_IMPL_IO_CONTEXT_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <boost/asio/io_context.hpp>
+#include <boost/asio/detail/concurrency_hint.hpp>
+#include <boost/asio/detail/limits.hpp>
+#include <boost/asio/detail/scoped_ptr.hpp>
+#include <boost/asio/detail/service_registry.hpp>
+#include <boost/asio/detail/throw_error.hpp>
+
+#if defined(BOOST_ASIO_HAS_IOCP)
+# include <boost/asio/detail/win_iocp_io_context.hpp>
+#else
+# include <boost/asio/detail/scheduler.hpp>
+#endif
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+io_context::io_context()
+  : impl_(add_impl(new impl_type(*this, BOOST_ASIO_CONCURRENCY_HINT_DEFAULT)))
+{
+}
+
+io_context::io_context(int concurrency_hint)
+  : impl_(add_impl(new impl_type(*this, concurrency_hint == 1
+          ? BOOST_ASIO_CONCURRENCY_HINT_1 : concurrency_hint)))
+{
+}
+
+io_context::impl_type& io_context::add_impl(io_context::impl_type* impl)
+{
+  boost::asio::detail::scoped_ptr<impl_type> scoped_impl(impl);
+  boost::asio::add_service<impl_type>(*this, scoped_impl.get());
+  return *scoped_impl.release();
+}
+
+io_context::~io_context()
+{
+}
+
+io_context::count_type io_context::run()
+{
+  boost::system::error_code ec;
+  count_type s = impl_.run(ec);
+  boost::asio::detail::throw_error(ec);
+  return s;
+}
+
+#if !defined(BOOST_ASIO_NO_DEPRECATED)
+io_context::count_type io_context::run(boost::system::error_code& ec)
+{
+  return impl_.run(ec);
+}
+#endif // !defined(BOOST_ASIO_NO_DEPRECATED)
+
+io_context::count_type io_context::run_one()
+{
+  boost::system::error_code ec;
+  count_type s = impl_.run_one(ec);
+  boost::asio::detail::throw_error(ec);
+  return s;
+}
+
+#if !defined(BOOST_ASIO_NO_DEPRECATED)
+io_context::count_type io_context::run_one(boost::system::error_code& ec)
+{
+  return impl_.run_one(ec);
+}
+#endif // !defined(BOOST_ASIO_NO_DEPRECATED)
+
+io_context::count_type io_context::poll()
+{
+  boost::system::error_code ec;
+  count_type s = impl_.poll(ec);
+  boost::asio::detail::throw_error(ec);
+  return s;
+}
+
+#if !defined(BOOST_ASIO_NO_DEPRECATED)
+io_context::count_type io_context::poll(boost::system::error_code& ec)
+{
+  return impl_.poll(ec);
+}
+#endif // !defined(BOOST_ASIO_NO_DEPRECATED)
+
+io_context::count_type io_context::poll_one()
+{
+  boost::system::error_code ec;
+  count_type s = impl_.poll_one(ec);
+  boost::asio::detail::throw_error(ec);
+  return s;
+}
+
+#if !defined(BOOST_ASIO_NO_DEPRECATED)
+io_context::count_type io_context::poll_one(boost::system::error_code& ec)
+{
+  return impl_.poll_one(ec);
+}
+#endif // !defined(BOOST_ASIO_NO_DEPRECATED)
+
+void io_context::stop()
+{
+  impl_.stop();
+}
+
+bool io_context::stopped() const
+{
+  return impl_.stopped();
+}
+
+void io_context::restart()
+{
+  impl_.restart();
+}
+
+io_context::service::service(boost::asio::io_context& owner)
+  : execution_context::service(owner)
+{
+}
+
+io_context::service::~service()
+{
+}
+
+void io_context::service::shutdown()
+{
+#if !defined(BOOST_ASIO_NO_DEPRECATED)
+  shutdown_service();
+#endif // !defined(BOOST_ASIO_NO_DEPRECATED)
+}
+
+#if !defined(BOOST_ASIO_NO_DEPRECATED)
+void io_context::service::shutdown_service()
+{
+}
+#endif // !defined(BOOST_ASIO_NO_DEPRECATED)
+
+void io_context::service::notify_fork(io_context::fork_event ev)
+{
+#if !defined(BOOST_ASIO_NO_DEPRECATED)
+  fork_service(ev);
+#else // !defined(BOOST_ASIO_NO_DEPRECATED)
+  (void)ev;
+#endif // !defined(BOOST_ASIO_NO_DEPRECATED)
+}
+
+#if !defined(BOOST_ASIO_NO_DEPRECATED)
+void io_context::service::fork_service(io_context::fork_event)
+{
+}
+#endif // !defined(BOOST_ASIO_NO_DEPRECATED)
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_IMPL_IO_CONTEXT_IPP