Added boost header

test/external/boost/mpl/aux_/back_impl.hpp

@@ -0,0 +1,43 @@
+
+#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: 2008-10-11 02:19:02 -0400 (Sat, 11 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