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#ifndef BOOST_MPL_AUX_ERASE_IMPL_HPP_INCLUDED
#define BOOST_MPL_AUX_ERASE_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/clear.hpp>
#include <boost/mpl/push_front.hpp>
#include <boost/mpl/reverse_fold.hpp>
#include <boost/mpl/iterator_range.hpp>
#include <boost/mpl/next.hpp>
#include <boost/mpl/aux_/na.hpp>
namespace boost { namespace mpl {
// default implementation; conrete sequences might override it by
// specializing either the 'erase_impl' or the primary 'erase' template
template< typename Tag >
struct erase_impl
{
template<
typename Sequence
, typename First
, typename Last
>
struct apply
{
typedef typename if_na< Last,typename next<First>::type >::type last_;
// 1st half: [begin, first)
typedef iterator_range<
typename begin<Sequence>::type
, First
> first_half_;
// 2nd half: [last, end) ... that is, [last + 1, end)
typedef iterator_range<
last_
, 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_
, half_sequence_
, push_front<_,_>
>::type type;
};
};
}}
#endif // BOOST_MPL_AUX_ERASE_IMPL_HPP_INCLUDED
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