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diff --git a/boost/beast/core/detail/async_base.hpp b/boost/beast/core/detail/async_base.hpp
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+++ b/boost/beast/core/detail/async_base.hpp
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+//
+// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail 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)
+//
+// Official repository: https://github.com/boostorg/beast
+//
+
+#ifndef BOOST_BEAST_CORE_DETAIL_ASYNC_BASE_HPP
+#define BOOST_BEAST_CORE_DETAIL_ASYNC_BASE_HPP
+
+#include <boost/core/exchange.hpp>
+
+namespace boost {
+namespace beast {
+namespace detail {
+
+struct stable_base
+{
+    static
+    void
+    destroy_list(stable_base*& list)
+    {
+        while(list)
+        {
+            auto next = list->next_;
+            list->destroy();
+            list = next;
+        }
+    }
+
+    stable_base* next_ = nullptr;
+
+protected:
+    stable_base() = default;
+    virtual ~stable_base() = default;
+
+    virtual void destroy() = 0;
+};
+
+} // detail
+} // beast
+} // boost
+
+#endif