45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
/* Copyright 2003-2021 Joaquin M Lopez Munoz.
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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/multi_index for library home page.
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*/
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#ifndef BOOST_MULTI_INDEX_DETAIL_INVALIDATE_ITERATORS_HPP
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#define BOOST_MULTI_INDEX_DETAIL_INVALIDATE_ITERATORS_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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namespace boost{
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namespace multi_index{
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namespace detail{
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/* invalidate_iterators mimics the interface of index_access_sequence (see
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* index_access_sequence.hpp) but returns dummy indices whose iterator type
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* won't ever match those of the source: the net effect is that safe iterator
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* transfer resolves to iterator invalidation, so backbone function invocation
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* extract_(x,invalidate_iterators()) is used in extraction scenarios other
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* than merging.
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*/
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struct invalidate_iterators
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{
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typedef void iterator;
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invalidate_iterators& get(){return *this;}
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invalidate_iterators& next(){return *this;}
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};
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} /* namespace multi_index::detail */
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} /* namespace multi_index */
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} /* namespace boost */
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#endif
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