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+
+#ifndef BOOST_MPL_INSERT_IMPL_HPP_INCLUDED
+#define BOOST_MPL_INSERT_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.
+
+// $Id$
+// $Date$
+// $Revision$
+
+#include <boost/mpl/reverse_fold.hpp>
+#include <boost/mpl/iterator_range.hpp>
+#include <boost/mpl/clear.hpp>
+#include <boost/mpl/push_front.hpp>
+#include <boost/mpl/aux_/na_spec.hpp>
+#include <boost/mpl/aux_/traits_lambda_spec.hpp>
+#include <boost/type_traits/is_same.hpp>
+
+namespace boost { namespace mpl {
+
+// default implementation; conrete sequences might override it by
+// specializing either the 'insert_impl' or the primary 'insert' template
+
+template< typename Tag >
+struct insert_impl
+{
+ template<
+ typename Sequence
+ , typename Pos
+ , typename T
+ >
+ struct apply
+ {
+ typedef iterator_range<
+ typename begin<Sequence>::type
+ , Pos
+ > first_half_;
+
+ typedef iterator_range<
+ Pos
+ , typename end<Sequence>::type
+ > second_half_;
+
+ typedef typename reverse_fold<
+ second_half_
+ , typename clear<Sequence>::type
+ , push_front<_,_>
+ >::type half_sequence_;
+
+ typedef typename reverse_fold<
+ first_half_
+ , typename push_front<half_sequence_,T>::type
+ , push_front<_,_>
+ >::type type;
+ };
+};
+
+BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(3,insert_impl)
+
+}}
+
+#endif // BOOST_MPL_INSERT_IMPL_HPP_INCLUDED