id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13478	multi_index_container serialization of non copyable types	Sébastien Paris <sebastien.paris@…>	Joaquín M López Muñoz	"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
}

}}}"	Bugs	closed	To Be Determined	multi_index	Boost 1.66.0	Problem	fixed	serialization non-copyable