1/* Copyright 2003-2021 Joaquin M Lopez Munoz.
2 * Distributed under the Boost Software License, Version 1.0.
3 * (See accompanying file LICENSE_1_0.txt or copy at
4 * http://www.boost.org/LICENSE_1_0.txt)
5 *
6 * See http://www.boost.org/libs/multi_index for library home page.
7 */
8
9#ifndef BOOST_MULTI_INDEX_DETAIL_INVALIDATE_ITERATORS_HPP
10#define BOOST_MULTI_INDEX_DETAIL_INVALIDATE_ITERATORS_HPP
11
12#if defined(_MSC_VER)
13#pragma once
14#endif
15
16namespace boost{
17
18namespace multi_index{
19
20namespace detail{
21
22/* invalidate_iterators mimics the interface of index_access_sequence (see
23 * index_access_sequence.hpp) but returns dummy indices whose iterator type
24 * won't ever match those of the source: the net effect is that safe iterator
25 * transfer resolves to iterator invalidation, so backbone function invocation
26 * extract_(x,invalidate_iterators()) is used in extraction scenarios other
27 * than merging.
28 */
29
30struct invalidate_iterators
31{
32 typedef void iterator;
33
34 invalidate_iterators& get(){return *this;}
35 invalidate_iterators& next(){return *this;}
36};
37
38} /* namespace multi_index::detail */
39
40} /* namespace multi_index */
41
42} /* namespace boost */
43
44#endif
45