Re: [boost] [serialization] failures of test_exported* tests with gcc4.1 and higher

From: Robert Ramey (ramey_at_[hidden])
Date: 2008-01-18 00:25:44

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);
> }
>
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