Re: [boost] [serialization] failures of test_exported* tests with gcc 4.1 and higher

From: Boris Gubenko (Boris.Gubenko_at_[hidden])
Date: 2008-01-18 02:00:55

  The situation is that with polymorphic base class, serialization
  library throws an exception. With non-polymorphic base class, the
  program succeeds.

  You are, probably, right that while x.cpp in my previous mail and
  test_exported.cpp throw the same exception, the cause may be different.
  I tried x.cpp (with polymorphic base class) with aCC instead of gcc
  and got:

aCC runtime: Uncaught exception of type "boost::archive::archive_exception".

  At the same time, test_exported succeeds with aCC.

  I'll try serialization library at rrsd.com when I have a chance.
  In the meantime, do you have any idea why the program might
  be throwing exception with 1.35?

  Thanks,
    Boris

Robert Ramey wrote:
> One can't invoke any function of the derived class through a base class
> pointer unless the base class is polymorphic - that is has at least one
> virtual function.
>
> Serialization is no different in this regard.
>
> I would not expect the behavior of the program below to
> change between version.
>
> The error message is the same as those failures in test_export
> but the cause isn't necessarily the same.
>
> I would be curious of the version 1.36 serialization library
> at rrsd.com would pass tests with gcc 4.1 and higher.
>
> Robert Ramey
>
> Boris Gubenko wrote:
> >  x.cpp below reproduces failures of test_exported* tests on
> >  several platforms using gcc 4.1 and higher. The tests fail with:
> >
> > terminate called after throwing an instance of
> > 'boost::archive::archive_exception'
> >  what():  unregistered void cast
> >
> >  When compiled with macro WORKS defined, i.e. when destructor of
> >  the base class is removed, reproducer succeeds. Does it give any
> >  clue?
> >
> >  Thanks,
> >    Boris
> >
> > x.cpp
> > -----
> > #include <fstream>
> > #include <boost/archive/binary_oarchive.hpp>
> >
> > struct polymorphic_base
> > {
> >    template<class Archive>
> >    void serialize(Archive&, const unsigned int) {}
> > #ifndef WORKS
> >    virtual ~polymorphic_base(){}
> > #endif
> > };
> >
> > struct polymorphic_derived : polymorphic_base
> > {
> >    template<class Archive>
> >    void serialize(Archive&, const unsigned int) {}
> > };
> >
> > int main()
> > {
> >    std::ofstream os("x.x");
> >    boost::archive::binary_oarchive oa(os);
> >    polymorphic_base *rb = new polymorphic_derived;
> >    oa << BOOST_SERIALIZATION_NVP(rb);
> > }
> >
> >