forked from boostorg/mpl
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
//-----------------------------------------------------------------------------
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// boost mpl/aux_/erase_impl.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2000-02
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// Aleksey Gurtovoy
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appears in all copies and
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// that both the copyright notice and this permission notice appear in
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// supporting documentation. No representations are made about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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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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#include "boost/mpl/clear.hpp"
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#include "boost/mpl/push_front.hpp"
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#include "boost/mpl/copy_backward.hpp"
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#include "boost/mpl/iterator_range.hpp"
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#include "boost/mpl/aux_/void_spec.hpp"
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namespace boost {
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namespace mpl {
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// default implementation; conrete sequences might override it by
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// specializing either the |erase_traits| or the primary |erase| template
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template< typename Tag >
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struct erase_traits
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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 algorithm
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{
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private:
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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 copy_backward<
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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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public:
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typedef typename copy_backward<
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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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} // namespace mpl
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} // namespace boost
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#endif // BOOST_MPL_AUX_ERASE_IMPL_HPP_INCLUDED
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