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diff --git a/boost/asio/impl/system_executor.hpp b/boost/asio/impl/system_executor.hpp
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+++ b/boost/asio/impl/system_executor.hpp
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+//
+// impl/system_executor.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// 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_SYSTEM_EXECUTOR_HPP
+#define BOOST_ASIO_IMPL_SYSTEM_EXECUTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/executor_op.hpp>
+#include <boost/asio/detail/global.hpp>
+#include <boost/asio/detail/recycling_allocator.hpp>
+#include <boost/asio/detail/type_traits.hpp>
+#include <boost/asio/system_context.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+inline system_context& system_executor::context() const BOOST_ASIO_NOEXCEPT
+{
+  return detail::global<system_context>();
+}
+
+template <typename Function, typename Allocator>
+void system_executor::dispatch(
+    BOOST_ASIO_MOVE_ARG(Function) f, const Allocator&) const
+{
+  typename decay<Function>::type tmp(BOOST_ASIO_MOVE_CAST(Function)(f));
+  boost_asio_handler_invoke_helpers::invoke(tmp, tmp);
+}
+
+template <typename Function, typename Allocator>
+void system_executor::post(
+    BOOST_ASIO_MOVE_ARG(Function) f, const Allocator& a) const
+{
+  typedef typename decay<Function>::type function_type;
+
+  system_context& ctx = detail::global<system_context>();
+
+  // Allocate and construct an operation to wrap the function.
+  typedef detail::executor_op<function_type, Allocator> op;
+  typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
+  p.p = new (p.v) op(BOOST_ASIO_MOVE_CAST(Function)(f), a);
+
+  BOOST_ASIO_HANDLER_CREATION((ctx, *p.p,
+        "system_executor", &this->context(), 0, "post"));
+
+  ctx.scheduler_.post_immediate_completion(p.p, false);
+  p.v = p.p = 0;
+}
+
+template <typename Function, typename Allocator>
+void system_executor::defer(
+    BOOST_ASIO_MOVE_ARG(Function) f, const Allocator& a) const
+{
+  typedef typename decay<Function>::type function_type;
+
+  system_context& ctx = detail::global<system_context>();
+
+  // Allocate and construct an operation to wrap the function.
+  typedef detail::executor_op<function_type, Allocator> op;
+  typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
+  p.p = new (p.v) op(BOOST_ASIO_MOVE_CAST(Function)(f), a);
+
+  BOOST_ASIO_HANDLER_CREATION((ctx, *p.p,
+        "system_executor", &this->context(), 0, "defer"));
+
+  ctx.scheduler_.post_immediate_completion(p.p, true);
+  p.v = p.p = 0;
+}
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_IMPL_SYSTEM_EXECUTOR_HPP