Re: [Boost-bugs] [Boost C++ Libraries] #9601: Unable to load archives with pointer instances which contain self reference cycles in 1.55

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9601: Unable to load archives with pointer instances which contain self reference cycles in 1.55
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-01-30 00:22:03

#9601: Unable to load archives with pointer instances which contain self reference
cycles in 1.55
-------------------------------+---------------------------
  Reporter:  brandon.kohn      |      Owner:  ramey
      Type:  Bugs              |     Status:  assigned
 Milestone:  To Be Determined  |  Component:  serialization
   Version:  Boost 1.55.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+---------------------------

Comment (by ramey):

 I've spent a fair amount of time investigating this.

 I think that this is a problem which as always existed in the library.
 Note that the following fails

 {{{
         PointerHolder *pph = new PointerHolder;
         pph->m_ph = pph;

         test_ostream os(testfile, TEST_STREAM_FLAGS);
         test_oarchive oa(os, TEST_ARCHIVE_FLAGS);

         //oa << BOOST_SERIALIZATION_NVP(pph);
         oa << pph;

 }}}

 While this passes:

 {{{
         PointerHolder ph;
         pph.m_ph = ph;

         test_ostream os(testfile, TEST_STREAM_FLAGS);
         test_oarchive oa(os, TEST_ARCHIVE_FLAGS);

         //oa << BOOST_SERIALIZATION_NVP(pph);
         oa << pph;

 }}}

 That is, this issue is the usage of a recursive data structure at the
 "top" level.

 Actually I believe that this could occur whenever ALL the pointers are
 allocated with "new" so I think your fix is too specific.  On the other
 hand, looking at the internals, it's not obvious how to fix this.  It's
 sort of a chicken and egg issue.  That is it's hard to assign the address
 of an object which we are still creating.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9601#comment:7>
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