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diff --git a/boost/asio/detail/handler_alloc_helpers.hpp b/boost/asio/detail/handler_alloc_helpers.hpp
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+++ b/boost/asio/detail/handler_alloc_helpers.hpp
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+//
+// detail/handler_alloc_helpers.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 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 BOOST_ASIO_DETAIL_HANDLER_ALLOC_HELPERS_HPP
+#define BOOST_ASIO_DETAIL_HANDLER_ALLOC_HELPERS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <boost/detail/workaround.hpp>
+#include <boost/utility/addressof.hpp>
+#include <boost/asio/detail/noncopyable.hpp>
+#include <boost/asio/handler_alloc_hook.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+// Calls to asio_handler_allocate and asio_handler_deallocate must be made from
+// a namespace that does not contain any overloads of these functions. The
+// boost_asio_handler_alloc_helpers namespace is defined here for that purpose.
+namespace boost_asio_handler_alloc_helpers {
+
+template <typename Handler>
+inline void* allocate(std::size_t s, Handler& h)
+{
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) \
+  || BOOST_WORKAROUND(__GNUC__, < 3)
+  return ::operator new(s);
+#else
+  using boost::asio::asio_handler_allocate;
+  return asio_handler_allocate(s, boost::addressof(h));
+#endif
+}
+
+template <typename Handler>
+inline void deallocate(void* p, std::size_t s, Handler& h)
+{
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) \
+  || BOOST_WORKAROUND(__GNUC__, < 3)
+  ::operator delete(p);
+#else
+  using boost::asio::asio_handler_deallocate;
+  asio_handler_deallocate(p, s, boost::addressof(h));
+#endif
+}
+
+} // namespace boost_asio_handler_alloc_helpers
+
+#define BOOST_ASIO_DEFINE_HANDLER_PTR(op) \
+  struct ptr \
+  { \
+    Handler* h; \
+    void* v; \
+    op* p; \
+    ~ptr() \
+    { \
+      reset(); \
+    } \
+    void reset() \
+    { \
+      if (p) \
+      { \
+        p->~op(); \
+        p = 0; \
+      } \
+      if (v) \
+      { \
+        boost_asio_handler_alloc_helpers::deallocate(v, sizeof(op), *h); \
+        v = 0; \
+      } \
+    } \
+  } \
+  /**/
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_HANDLER_ALLOC_HELPERS_HPP