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diff --git a/boost/beast/core/impl/async_base.hpp b/boost/beast/core/impl/async_base.hpp
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+++ b/boost/beast/core/impl/async_base.hpp
@@ -0,0 +1,156 @@
+//
+// 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_IMPL_ASYNC_BASE_HPP
+#define BOOST_BEAST_CORE_IMPL_ASYNC_BASE_HPP
+
+#include <boost/core/exchange.hpp>
+
+namespace boost {
+namespace beast {
+
+namespace detail {
+
+template<class State, class Allocator>
+struct allocate_stable_state final
+    : stable_base
+    , boost::empty_value<Allocator>
+{
+    State value;
+
+    template<class... Args>
+    explicit
+    allocate_stable_state(
+        Allocator const& alloc,
+        Args&&... args)
+        : boost::empty_value<Allocator>(
+            boost::empty_init_t{}, alloc)
+        , value{std::forward<Args>(args)...}
+    {
+    }
+
+    void destroy() override
+    {
+        using A = typename allocator_traits<
+            Allocator>::template rebind_alloc<
+                allocate_stable_state>;
+
+        A a(this->get());
+        detail::allocator_traits<A>::destroy(a, this);
+        detail::allocator_traits<A>::deallocate(a, this, 1);
+    }
+};
+
+} // detail
+
+template<
+    class Handler,
+    class Executor1,
+    class Allocator,
+    class Function>
+void asio_handler_invoke(
+    Function&& f,
+    async_base<Handler, Executor1, Allocator>* p)
+{
+    using net::asio_handler_invoke;
+    asio_handler_invoke(f,
+        p->get_legacy_handler_pointer());
+}
+
+template<
+    class Handler,
+    class Executor1,
+    class Allocator>
+void*
+asio_handler_allocate(
+    std::size_t size,
+    async_base<Handler, Executor1, Allocator>* p)
+{
+    using net::asio_handler_allocate;
+    return asio_handler_allocate(size,
+        p->get_legacy_handler_pointer());
+}
+
+template<
+    class Handler,
+    class Executor1,
+    class Allocator>
+void
+asio_handler_deallocate(
+    void* mem, std::size_t size,
+    async_base<Handler, Executor1, Allocator>* p)
+{
+    using net::asio_handler_deallocate;
+    asio_handler_deallocate(mem, size,
+        p->get_legacy_handler_pointer());
+}
+
+template<
+    class Handler,
+    class Executor1,
+    class Allocator>
+bool
+asio_handler_is_continuation(
+    async_base<Handler, Executor1, Allocator>* p)
+{
+    using net::asio_handler_is_continuation;
+    return asio_handler_is_continuation(
+        p->get_legacy_handler_pointer());
+}
+
+template<
+    class State,
+    class Handler,
+    class Executor1,
+    class Allocator,
+    class... Args>
+State&
+allocate_stable(
+    stable_async_base<
+        Handler, Executor1, Allocator>& base,
+    Args&&... args)
+{
+    using allocator_type = typename stable_async_base<
+        Handler, Executor1, Allocator>::allocator_type;
+
+    using A = typename detail::allocator_traits<
+        allocator_type>::template rebind_alloc<
+            detail::allocate_stable_state<
+                State, allocator_type>>;
+
+    struct deleter
+    {
+        allocator_type alloc;
+        detail::allocate_stable_state<
+            State, allocator_type>* ptr;
+
+        ~deleter()
+        {
+            if(ptr)
+            {
+                A a(alloc);
+                detail::allocator_traits<A>::deallocate(a, ptr, 1);
+            }
+        }
+    };
+
+    A a(base.get_allocator());
+    deleter d{base.get_allocator(), nullptr};
+    d.ptr = detail::allocator_traits<A>::allocate(a, 1);
+    detail::allocator_traits<A>::construct(a, d.ptr,
+        d.alloc, std::forward<Args>(args)...);
+    d.ptr->next_ = base.list_;
+    base.list_ = d.ptr;
+    return boost::exchange(d.ptr, nullptr)->value;
+}
+
+} // beast
+} // boost
+
+#endif