ceph/src/boost/boost/multi_index/detail/invalidate_iterators.hpp

   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
  16 namespace boost{
  17
  18 namespace multi_index{
  19
  20 namespace 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
  30 struct 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