Line data    Source code

       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      101122 :   invalidate_iterators& next(){return *this;}
      36             : };
      37             : 
      38             : } /* namespace multi_index::detail */
      39             : 
      40             : } /* namespace multi_index */
      41             : 
      42             : } /* namespace boost */
      43             : 
      44             : #endif