update boost

linx64/include/boost/asio/detail/null_event.hpp

@@ -2,7 +2,7 @@
 // detail/null_event.hpp
 // ~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2023 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)
@@ -56,6 +56,12 @@ public:
   {
   }
 
+  // Unlock the mutex and signal one waiter who may destroy us.
+  template <typename Lock>
+  void unlock_and_signal_one_for_destruction(Lock&)
+  {
+  }
+
   // If there's a waiter, unlock the mutex and signal it.
   template <typename Lock>
   bool maybe_unlock_and_signal_one(Lock&)