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diff --git a/boost/asio/impl/io_service.hpp b/boost/asio/impl/io_service.hpp
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+//
+// impl/io_service.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 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_SERVICE_HPP
+#define BOOST_ASIO_IMPL_IO_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/handler_type_requirements.hpp>
+#include <boost/asio/detail/service_registry.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+template <typename Service>
+inline Service& use_service(io_service& ios)
+{
+  // Check that Service meets the necessary type requirements.
+  (void)static_cast<io_service::service*>(static_cast<Service*>(0));
+  (void)static_cast<const io_service::id*>(&Service::id);
+
+  return ios.service_registry_->template use_service<Service>();
+}
+
+template <>
+inline detail::io_service_impl& use_service<detail::io_service_impl>(
+    io_service& ios)
+{
+  return ios.impl_;
+}
+
+template <typename Service>
+inline void add_service(io_service& ios, Service* svc)
+{
+  // Check that Service meets the necessary type requirements.
+  (void)static_cast<io_service::service*>(static_cast<Service*>(0));
+  (void)static_cast<const io_service::id*>(&Service::id);
+
+  ios.service_registry_->template add_service<Service>(svc);
+}
+
+template <typename Service>
+inline bool has_service(io_service& ios)
+{
+  // Check that Service meets the necessary type requirements.
+  (void)static_cast<io_service::service*>(static_cast<Service*>(0));
+  (void)static_cast<const io_service::id*>(&Service::id);
+
+  return ios.service_registry_->template has_service<Service>();
+}
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#if defined(BOOST_ASIO_HAS_IOCP)
+# include <boost/asio/detail/win_iocp_io_service.hpp>
+#else
+# include <boost/asio/detail/task_io_service.hpp>
+#endif
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+template <typename CompletionHandler>
+inline void io_service::dispatch(
+    BOOST_ASIO_MOVE_ARG(CompletionHandler) handler)
+{
+  // If you get an error on the following line it means that your handler does
+  // not meet the documented type requirements for a CompletionHandler.
+  BOOST_ASIO_COMPLETION_HANDLER_CHECK(CompletionHandler, handler) type_check;
+
+  impl_.dispatch(BOOST_ASIO_MOVE_CAST(CompletionHandler)(handler));
+}
+
+template <typename CompletionHandler>
+inline void io_service::post(BOOST_ASIO_MOVE_ARG(CompletionHandler) handler)
+{
+  // If you get an error on the following line it means that your handler does
+  // not meet the documented type requirements for a CompletionHandler.
+  BOOST_ASIO_COMPLETION_HANDLER_CHECK(CompletionHandler, handler) type_check;
+
+  impl_.post(BOOST_ASIO_MOVE_CAST(CompletionHandler)(handler));
+}
+
+template <typename Handler>
+#if defined(GENERATING_DOCUMENTATION)
+unspecified
+#else
+inline detail::wrapped_handler<io_service&, Handler>
+#endif
+io_service::wrap(Handler handler)
+{
+  return detail::wrapped_handler<io_service&, Handler>(*this, handler);
+}
+
+inline io_service::work::work(boost::asio::io_service& io_service)
+  : io_service_impl_(io_service.impl_)
+{
+  io_service_impl_.work_started();
+}
+
+inline io_service::work::work(const work& other)
+  : io_service_impl_(other.io_service_impl_)
+{
+  io_service_impl_.work_started();
+}
+
+inline io_service::work::~work()
+{
+  io_service_impl_.work_finished();
+}
+
+inline boost::asio::io_service& io_service::work::get_io_service()
+{
+  return io_service_impl_.get_io_service();
+}
+
+inline boost::asio::io_service& io_service::service::get_io_service()
+{
+  return owner_;
+}
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_IMPL_IO_SERVICE_HPP