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erase_impl.hpp in vendors/XIOS/current/extern/boost/include/boost/mpl/aux_ – NEMO

source: vendors/XIOS/current/extern/boost/include/boost/mpl/aux_/erase_impl.hpp @ 3408

Last change on this file since 3408 was 3408, checked in by rblod, 12 years ago

importing initial XIOS vendor drop

  • Property svn:keywords set to Id
File size: 1.8 KB
Line 
1
2#ifndef BOOST_MPL_AUX_ERASE_IMPL_HPP_INCLUDED
3#define BOOST_MPL_AUX_ERASE_IMPL_HPP_INCLUDED
4
5// Copyright Aleksey Gurtovoy 2000-2004
6//
7// Distributed under the Boost Software License, Version 1.0.
8// (See accompanying file LICENSE_1_0.txt or copy at
9// http://www.boost.org/LICENSE_1_0.txt)
10//
11// See http://www.boost.org/libs/mpl for documentation.
12
13// $Id$
14// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
15// $Revision: 49267 $
16
17#include <boost/mpl/clear.hpp>
18#include <boost/mpl/push_front.hpp>
19#include <boost/mpl/reverse_fold.hpp>
20#include <boost/mpl/iterator_range.hpp>
21#include <boost/mpl/next.hpp>
22#include <boost/mpl/aux_/na.hpp>
23
24namespace boost { namespace mpl {
25
26// default implementation; conrete sequences might override it by
27// specializing either the 'erase_impl' or the primary 'erase' template
28
29template< typename Tag >
30struct erase_impl
31{
32    template<
33          typename Sequence
34        , typename First
35        , typename Last
36        >
37    struct apply
38    {
39        typedef typename if_na< Last,typename next<First>::type >::type last_;
40       
41        // 1st half: [begin, first)
42        typedef iterator_range<
43              typename begin<Sequence>::type
44            , First
45            > first_half_;
46
47        // 2nd half: [last, end) ... that is, [last + 1, end)
48        typedef iterator_range<
49              last_
50            , typename end<Sequence>::type
51            > second_half_;
52
53        typedef typename reverse_fold<
54              second_half_
55            , typename clear<Sequence>::type
56            , push_front<_,_>
57            >::type half_sequence_;
58
59        typedef typename reverse_fold<
60              first_half_
61            , half_sequence_
62            , push_front<_,_>
63            >::type type;
64    };
65};
66
67}}
68
69#endif // BOOST_MPL_AUX_ERASE_IMPL_HPP_INCLUDED
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