2 #ifndef BOOST_MPL_AUX_ERASE_IMPL_HPP_INCLUDED
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3 #define BOOST_MPL_AUX_ERASE_IMPL_HPP_INCLUDED
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5 // Copyright Aleksey Gurtovoy 2000-2004
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7 // Distributed under the Boost Software License, Version 1.0.
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8 // (See accompanying file LICENSE_1_0.txt or copy at
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9 // http://www.boost.org/LICENSE_1_0.txt)
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11 // See http://www.boost.org/libs/mpl for documentation.
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13 // $Id: erase_impl.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
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14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
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15 // $Revision: 49267 $
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17 #include <boost/mpl/clear.hpp>
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18 #include <boost/mpl/push_front.hpp>
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19 #include <boost/mpl/reverse_fold.hpp>
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20 #include <boost/mpl/iterator_range.hpp>
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21 #include <boost/mpl/next.hpp>
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22 #include <boost/mpl/aux_/na.hpp>
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24 namespace boost { namespace mpl {
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26 // default implementation; conrete sequences might override it by
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27 // specializing either the 'erase_impl' or the primary 'erase' template
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29 template< typename Tag >
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39 typedef typename if_na< Last,typename next<First>::type >::type last_;
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41 // 1st half: [begin, first)
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42 typedef iterator_range<
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43 typename begin<Sequence>::type
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47 // 2nd half: [last, end) ... that is, [last + 1, end)
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48 typedef iterator_range<
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50 , typename end<Sequence>::type
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53 typedef typename reverse_fold<
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55 , typename clear<Sequence>::type
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57 >::type half_sequence_;
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59 typedef typename reverse_fold<
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69 #endif // BOOST_MPL_AUX_ERASE_IMPL_HPP_INCLUDED
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