[Boost-bugs] [Boost C++ Libraries] #13478: multi_index_container serialization of non copyable types

Subject: [Boost-bugs] [Boost C++ Libraries] #13478: multi_index_container serialization of non copyable types
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2018-03-13 08:34:46

#13478: multi_index_container serialization of non copyable types
-------------------------------------------------+-------------------------
 Reporter:  Sébastien Paris <sebastien.paris@…>  |      Owner:  Joaquín M
                                                 |  López Muñoz
     Type:  Bugs                                 |     Status:  new
Milestone:  To Be Determined                     |  Component:  multi_index
  Version:  Boost 1.66.0                         |   Severity:  Problem
 Keywords:  serialization non-copyable           |
-------------------------------------------------+-------------------------
 A multi_index container holding non-copyable types fails to serialize
 because of delayed insertion through {{{std::pair<node_type*,bool>
 insert_(const Value& v,Variant variant)}}} in
 multi_index_container.hpp:555 happening in {{{void load(Archive& ar,const
 unsigned int version)}}} in multi_index_container.hpp:940

 The insertion should use a rvalue reference overload moving the previously
 loaded value.

 Minimal example:
 {{{
 template<class Archive>
 void check_serialize(Archive &ar)
 {
     using non_copyable_type = std::unique_ptr<int>;
     using non_copyable_multi_index = boost::multi_index_container
         <   non_copyable_type
         ,   boost::multi_index::indexed_by
             <   boost::multi_index::hashed_unique
                 <   boost::multi_index::const_mem_fun
                     <   non_copyable_type
                     ,   typename non_copyable_type::pointer
                     ,   &non_copyable_type::get
                     >
                 >
             >
         >;

    non_copyable_multi_index mu; // fine

    if constexpr (Archive::is_saving::value)
         ar << boost::serialization::make_nvp("mu",mu); // fine
    else
         ar >> boost::serialization::make_nvp("mu",mu); // error
 }

 }}}

-- 
Ticket URL: <https://svn.boost.org/trac10/ticket/13478>
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