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diff --git a/boost/mpl/inherit.hpp b/boost/mpl/inherit.hpp
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+
+#if !defined(BOOST_PP_IS_ITERATING)
+
+///// header body
+
+#ifndef BOOST_MPL_INHERIT_HPP_INCLUDED
+#define BOOST_MPL_INHERIT_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2001-2004
+//
+// 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)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Id: inherit.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
+// $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
+// $Revision: 49267 $
+
+#if !defined(BOOST_MPL_PREPROCESSING_MODE)
+#   include <boost/mpl/empty_base.hpp>
+#   include <boost/mpl/aux_/na_spec.hpp>
+#   include <boost/mpl/aux_/lambda_support.hpp>
+#endif
+
+#include <boost/mpl/aux_/config/use_preprocessed.hpp>
+
+#if !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \
+    && !defined(BOOST_MPL_PREPROCESSING_MODE)
+
+#   define BOOST_MPL_PREPROCESSED_HEADER inherit.hpp
+#   include <boost/mpl/aux_/include_preprocessed.hpp>
+
+#else
+
+#   include <boost/mpl/limits/arity.hpp>
+#   include <boost/mpl/aux_/preprocessor/params.hpp>
+#   include <boost/mpl/aux_/preprocessor/default_params.hpp>
+#   include <boost/mpl/aux_/preprocessor/enum.hpp>
+#   include <boost/mpl/aux_/config/ctps.hpp>
+#   include <boost/mpl/aux_/config/dtp.hpp>
+
+#   include <boost/preprocessor/iterate.hpp>
+#   include <boost/preprocessor/dec.hpp>
+#   include <boost/preprocessor/cat.hpp>
+
+namespace boost { namespace mpl {
+
+// 'inherit<T1,T2,..,Tn>' metafunction; returns an unspecified class type
+// produced by public derivation from all metafunction's parameters 
+// (T1,T2,..,Tn), except the parameters of 'empty_base' class type; 
+// regardless the position and number of 'empty_base' parameters in the 
+// metafunction's argument list, derivation from them is always a no-op;
+// for instance:
+//      inherit<her>::type == her
+//      inherit<her,my>::type == struct unspecified : her, my {};
+//      inherit<empty_base,her>::type == her
+//      inherit<empty_base,her,empty_base,empty_base>::type == her
+//      inherit<her,empty_base,my>::type == struct unspecified : her, my {};
+//      inherit<empty_base,empty_base>::type == empty_base
+
+#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
+
+template< 
+      typename BOOST_MPL_AUX_NA_PARAM(T1)
+    , typename BOOST_MPL_AUX_NA_PARAM(T2)
+    > 
+struct inherit2
+    : T1, T2
+{
+    typedef inherit2 type;
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(2, inherit2, (T1,T2))
+};
+
+template< typename T1 > 
+struct inherit2<T1,empty_base>
+{
+    typedef T1 type;
+    BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2, inherit2, (T1,empty_base))
+};
+
+template< typename T2 > 
+struct inherit2<empty_base,T2>
+{
+    typedef T2 type;
+    BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2, inherit2, (empty_base,T2))
+};
+
+// needed to disambiguate the previous two in case when both 
+// T1 and T2 == empty_base
+template<> 
+struct inherit2<empty_base,empty_base>
+{
+    typedef empty_base type;
+    BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2, inherit2, (empty_base,empty_base))
+};
+
+#else
+
+namespace aux {
+
+template< bool C1, bool C2 >
+struct inherit2_impl
+{
+    template< typename Derived, typename T1, typename T2 > struct result_ 
+        : T1, T2
+    {
+        typedef Derived type_;
+    };
+};
+
+template<>
+struct inherit2_impl<false,true>
+{
+    template< typename Derived, typename T1, typename T2 > struct result_
+        : T1
+    {
+        typedef T1 type_;
+    };
+};
+
+template<>
+struct inherit2_impl<true,false>
+{
+    template< typename Derived, typename T1, typename T2 > struct result_
+        : T2 
+    {
+        typedef T2 type_;
+    };
+};
+
+template<>
+struct inherit2_impl<true,true>
+{
+    template< typename Derived, typename T1, typename T2 > struct result_
+    {
+        typedef T1 type_;
+    };
+};
+
+} // namespace aux
+
+template< 
+      typename BOOST_MPL_AUX_NA_PARAM(T1)
+    , typename BOOST_MPL_AUX_NA_PARAM(T2)
+    > 
+struct inherit2
+    : aux::inherit2_impl<
+          is_empty_base<T1>::value
+        , is_empty_base<T2>::value
+        >::template result_< inherit2<T1,T2>,T1,T2 >
+{
+    typedef typename inherit2::type_ type;
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(2, inherit2, (T1,T2))
+};
+
+#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+BOOST_MPL_AUX_NA_SPEC(2, inherit2)
+
+#define BOOST_PP_ITERATION_PARAMS_1 \
+    (3,(3, BOOST_MPL_LIMIT_METAFUNCTION_ARITY, <boost/mpl/inherit.hpp>))
+#include BOOST_PP_ITERATE()
+
+}}
+
+#endif // BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
+#endif // BOOST_MPL_INHERIT_HPP_INCLUDED
+
+///// iteration
+
+#else
+#define n_ BOOST_PP_FRAME_ITERATION(1)
+
+template<
+      BOOST_MPL_PP_DEFAULT_PARAMS(n_, typename T, na)
+    >
+struct BOOST_PP_CAT(inherit,n_)
+    : inherit2<
+          typename BOOST_PP_CAT(inherit,BOOST_PP_DEC(n_))<
+              BOOST_MPL_PP_PARAMS(BOOST_PP_DEC(n_), T)
+            >::type
+        , BOOST_PP_CAT(T,n_)
+        >
+{
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(
+          n_
+        , BOOST_PP_CAT(inherit,n_)
+        , (BOOST_MPL_PP_PARAMS(n_, T))
+        )
+};
+
+BOOST_MPL_AUX_NA_SPEC(n_, BOOST_PP_CAT(inherit,n_))
+
+#if n_ == BOOST_MPL_LIMIT_METAFUNCTION_ARITY
+/// primary template
+template<
+      BOOST_MPL_PP_DEFAULT_PARAMS(n_, typename T, empty_base)
+    >
+struct inherit
+    : BOOST_PP_CAT(inherit,n_)<BOOST_MPL_PP_PARAMS(n_, T)>
+{
+};
+
+// 'na' specialization
+template<>
+struct inherit< BOOST_MPL_PP_ENUM(5, na) >
+{
+    template<
+#if !defined(BOOST_MPL_CFG_NO_DEFAULT_PARAMETERS_IN_NESTED_TEMPLATES)
+          BOOST_MPL_PP_DEFAULT_PARAMS(n_, typename T, empty_base)
+#else
+          BOOST_MPL_PP_PARAMS(n_, typename T)
+#endif
+        >
+    struct apply
+        : inherit< BOOST_MPL_PP_PARAMS(n_, T) >
+    {
+    };
+};
+
+BOOST_MPL_AUX_NA_SPEC_LAMBDA(n_, inherit)
+BOOST_MPL_AUX_NA_SPEC_ARITY(n_, inherit)
+BOOST_MPL_AUX_NA_SPEC_TEMPLATE_ARITY(n_, n_, inherit)
+#endif
+
+#undef n_
+#endif // BOOST_PP_IS_ITERATING