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-rw-r--r--3rdparty/asio/include/asio/detail/functional.hpp8
1 files changed, 7 insertions, 1 deletions
diff --git a/3rdparty/asio/include/asio/detail/functional.hpp b/3rdparty/asio/include/asio/detail/functional.hpp
index a72a5fc69fa..54256c130b0 100644
--- a/3rdparty/asio/include/asio/detail/functional.hpp
+++ b/3rdparty/asio/include/asio/detail/functional.hpp
@@ -2,7 +2,7 @@
// detail/functional.hpp
// ~~~~~~~~~~~~~~~~~~~~~
//
-// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// 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)
@@ -33,6 +33,12 @@ using boost::function;
#endif // defined(ASIO_HAS_STD_FUNCTION)
} // namespace detail
+
+#if defined(ASIO_HAS_STD_REFERENCE_WRAPPER)
+using std::ref;
+using std::reference_wrapper;
+#endif // defined(ASIO_HAS_STD_REFERENCE_WRAPPER)
+
} // namespace asio
#endif // ASIO_DETAIL_FUNCTIONAL_HPP