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+
+#ifndef BOOST_MPL_AUX_BACK_IMPL_HPP_INCLUDED
+#define BOOST_MPL_AUX_BACK_IMPL_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+//
+// 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: back_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
+// $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
+// $Revision: 49267 $
+
+#include <boost/mpl/begin_end.hpp>
+#include <boost/mpl/next_prior.hpp>
+#include <boost/mpl/deref.hpp>
+#include <boost/mpl/aux_/traits_lambda_spec.hpp>
+
+namespace boost { namespace mpl {
+
+// default implementation, requires at least bi-directional iterators;
+// conrete sequences might override it by specializing either the
+// 'back_impl' or the primary 'back' template
+
+template< typename Tag >
+struct back_impl
+{
+ template< typename Sequence > struct apply
+ {
+ typedef typename end<Sequence>::type end_;
+ typedef typename prior<end_>::type last_;
+ typedef typename deref<last_>::type type;
+ };
+};
+
+BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, back_impl)
+
+}}
+
+#endif // BOOST_MPL_AUX_BACK_IMPL_HPP_INCLUDED