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diff --git a/src/third_party/boost-1.60.0/boost/asio/detail/handler_invoke_helpers.hpp b/src/third_party/boost-1.60.0/boost/asio/detail/handler_invoke_helpers.hpp
new file mode 100644
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+++ b/src/third_party/boost-1.60.0/boost/asio/detail/handler_invoke_helpers.hpp
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+//
+// detail/handler_invoke_helpers.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2015 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_HANDLER_INVOKE_HELPERS_HPP
+#define BOOST_ASIO_DETAIL_HANDLER_INVOKE_HELPERS_HPP
+
+#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/detail/addressof.hpp>
+#include <boost/asio/handler_invoke_hook.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+// Calls to asio_handler_invoke must be made from a namespace that does not
+// contain overloads of this function. The boost_asio_handler_invoke_helpers
+// namespace is defined here for that purpose.
+namespace boost_asio_handler_invoke_helpers {
+
+template <typename Function, typename Context>
+inline void invoke(Function& function, Context& context)
+{
+#if !defined(BOOST_ASIO_HAS_HANDLER_HOOKS)
+  Function tmp(function);
+  tmp();
+#else
+  using boost::asio::asio_handler_invoke;
+  asio_handler_invoke(function, boost::asio::detail::addressof(context));
+#endif
+}
+
+template <typename Function, typename Context>
+inline void invoke(const Function& function, Context& context)
+{
+#if !defined(BOOST_ASIO_HAS_HANDLER_HOOKS)
+  Function tmp(function);
+  tmp();
+#else
+  using boost::asio::asio_handler_invoke;
+  asio_handler_invoke(function, boost::asio::detail::addressof(context));
+#endif
+}
+
+} // namespace boost_asio_handler_invoke_helpers
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_HANDLER_INVOKE_HELPERS_HPP