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diff --git a/3rdparty/asio/include/asio/detail/non_const_lvalue.hpp b/3rdparty/asio/include/asio/detail/non_const_lvalue.hpp
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+//
+// detail/non_const_lvalue.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 ASIO_DETAIL_NON_CONST_LVALUE_HPP
+#define ASIO_DETAIL_NON_CONST_LVALUE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/detail/type_traits.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename T>
+struct non_const_lvalue
+{
+#if defined(ASIO_HAS_MOVE)
+ explicit non_const_lvalue(T& t)
+ : value(static_cast<typename conditional<
+ is_same<T, typename decay<T>::type>::value,
+ typename decay<T>::type&, T&&>::type>(t))
+ {
+ }
+
+ typename conditional<is_same<T, typename decay<T>::type>::value,
+ typename decay<T>::type&, typename decay<T>::type>::type value;
+#else // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+ explicit non_const_lvalue(const typename decay<T>::type& t)
+ : value(t)
+ {
+ }
+
+ typename decay<T>::type value;
+#endif // defined(ASIO_HAS_MOVE)
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_NON_CONST_LVALUE_HPP