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70 lines
1.7 KiB
70 lines
1.7 KiB
3 years ago
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#ifndef BOOST_MPL_AUX_ERASE_IMPL_HPP_INCLUDED
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#define BOOST_MPL_AUX_ERASE_IMPL_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2000-2004
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Id$
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// $Date$
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// $Revision$
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#include <boost/mpl/clear.hpp>
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#include <boost/mpl/push_front.hpp>
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#include <boost/mpl/reverse_fold.hpp>
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#include <boost/mpl/iterator_range.hpp>
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#include <boost/mpl/next.hpp>
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#include <boost/mpl/aux_/na.hpp>
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namespace boost { namespace mpl {
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// default implementation; conrete sequences might override it by
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// specializing either the 'erase_impl' or the primary 'erase' template
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template< typename Tag >
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struct erase_impl
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{
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template<
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typename Sequence
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, typename First
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, typename Last
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>
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struct apply
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{
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typedef typename if_na< Last,typename next<First>::type >::type last_;
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// 1st half: [begin, first)
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typedef iterator_range<
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typename begin<Sequence>::type
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, First
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> first_half_;
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// 2nd half: [last, end) ... that is, [last + 1, end)
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typedef iterator_range<
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last_
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, typename end<Sequence>::type
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> second_half_;
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typedef typename reverse_fold<
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second_half_
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, typename clear<Sequence>::type
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, push_front<_,_>
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>::type half_sequence_;
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typedef typename reverse_fold<
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first_half_
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, half_sequence_
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, push_front<_,_>
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>::type type;
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};
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};
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}}
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#endif // BOOST_MPL_AUX_ERASE_IMPL_HPP_INCLUDED
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