Re: [Boost-bugs] [Boost C++ Libraries] #9567: De-serialization of enable_shared_from_this through base class pointer fails

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9567: De-serialization of enable_shared_from_this through base class pointer fails
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-02-04 01:16:38

#9567: De-serialization of enable_shared_from_this through base class pointer
fails
-------------------------+-------------------------------------------------
  Reporter:  Tim Regan   |      Owner:  ramey
      Type:  Bugs        |     Status:  new
 Milestone:  To Be       |  Component:  serialization
  Determined             |   Severity:  Problem
   Version:  Boost       |   Keywords:  serialization
  1.53.0                 |  enable_shared_from_this shared_ptr weak_ptr
Resolution:              |
-------------------------+-------------------------------------------------

Comment (by ramey):

 I compiled and ran your example on my machine and have reproduced the
 problem.

 Looking at your example, it seems to me that the serialization function of
 Derived should be:

 {{{
         template<class Archive>
         void serialize(Archive & ar, const unsigned int version)
         {
                ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Base);
                ar & boost::serialization::make_nvp(
                      enable_shared_from_this,
 boost::serialization::base_object<boost::enable_shared_from_this<Derived>
 >(*this)
                 )
                 ar & BOOST_SERIALIZATION_NVP(m_derived);
          }
 }}}

 Of course this begs the question as to how serialization for
 boost::enable_shared_from_this<Derived> should be implemented.  Of hand I
 don't remember what boost::enable_shared_from_this<Derived>does right now.
 ( could guess but I'm not going to waste your time).  So my advice is to
 figure out how to implement serialization for
 boost::enable_shared_from_this<Derived> and re-submit.

 maybe something like the following would work

 {{{
         template<class Archive>
         void serialize(Archive & ar, const unsigned int version)
         {
               boost_shared_ptr<Derived> m_sp = shared_from_this;
                ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Base);
                ar & BOOST_SERIALIZATION_NVP(m_sp);
                ar & BOOST_SERIALIZATION_NVP(m_derived);
          }
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9567#comment:3>
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