//-----------------------------------------------------------------------------
// boost mpl/insert_range_impl.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2000-02
// Aleksey Gurtovoy
//
// 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)

#ifndef BOOST_MPL_AUX_INSERT_RANGE_IMPL_HPP_INCLUDED
#define BOOST_MPL_AUX_INSERT_RANGE_IMPL_HPP_INCLUDED

#include "boost/mpl/copy_backward.hpp"
#include "boost/mpl/clear.hpp"
#include "boost/mpl/push_front.hpp"
#include "boost/mpl/iterator_range.hpp"
#include "boost/mpl/begin_end.hpp"
#include "boost/mpl/aux_/void_spec.hpp"
#include "boost/mpl/aux_/iter_push_front.hpp"
#include "boost/mpl/aux_/traits_lambda_spec.hpp"
#include "boost/type_traits/same_traits.hpp"

namespace boost {
namespace mpl {

// default implementation; conrete sequences might override it by 
// specializing either the |insert_range_traits| or the primary 
// |insert_range| template


template< typename Tag >
struct insert_range_traits
{
    template<
          typename Sequence
        , typename Pos
        , typename Range
        >
    struct algorithm
    {
        typedef typename copy_backward<
              iterator_range<Pos, typename end<Sequence>::type>
            , typename clear<Sequence>::type
            , push_front<_,_> 
            >::type first_part_;
        
        typedef typename copy_backward< 
              Range
            , first_part_
            , push_front<_,_> 
            >::type second_part_;
        
        typedef typename copy_backward<
              iterator_range<typename begin<Sequence>::type,Pos>
            , second_part_
            , push_front<_,_>
            >::type type;
    };
};

BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(3,insert_range_traits)

} // namespace mpl
} // namespace boost

#endif // BOOST_MPL_AUX_INSERT_RANGE_IMPL_HPP_INCLUDED