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diff --git a/boost/atomic/detail/casts.hpp b/boost/atomic/detail/casts.hpp
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+/*
+ * 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)
+ *
+ * Copyright (c) 2009 Helge Bahmann
+ * Copyright (c) 2012 Tim Blechmann
+ * Copyright (c) 2013 - 2014 Andrey Semashev
+ */
+/*!
+ * \file   atomic/detail/casts.hpp
+ *
+ * This header defines \c union_cast and \c memcpy_cast used to convert between storage and value types
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_CASTS_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_CASTS_HPP_INCLUDED_
+
+#include <cstring>
+#include <boost/atomic/detail/config.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+namespace atomics {
+namespace detail {
+
+template< typename To, typename From >
+BOOST_FORCEINLINE To union_cast(From const& from) BOOST_NOEXCEPT
+{
+    union
+    {
+        To as_to;
+        From as_from;
+    }
+    caster = {};
+    caster.as_from = from;
+    return caster.as_to;
+}
+
+template< typename To, typename From >
+BOOST_FORCEINLINE To memcpy_cast(From const& from) BOOST_NOEXCEPT
+{
+    struct
+    {
+        To to;
+    }
+    value = {};
+    std::memcpy
+    (
+        &reinterpret_cast< char& >(value.to),
+        &reinterpret_cast< const char& >(from),
+        (sizeof(From) < sizeof(To) ? sizeof(From) : sizeof(To))
+    );
+    return value.to;
+}
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#endif // BOOST_ATOMIC_DETAIL_CASTS_HPP_INCLUDED_