Re: [boost] serialization in multiple dlls

Subject: Re: [boost] serialization in multiple dlls
From: Robert Ramey (ramey_at_[hidden])
Date: 2010-12-08 13:04:44

pipalapop wrote:
> Hi,
> I have a problem with the deserialization of objects defined in
> multiple dlls.
> I define the following classes in a first dll: polymorphic_base (pure
> virtual) and polymorphic_derived1 (derived from polymorphic_base).
> In a second dll, I define the class polymorphic_derived2 (derived
> from polymorphic_derived1).
> In an executable, I serialize an object of type polymorphic_derived2
> followed and two objects of type polymorphic_derived1 in the order
> defined in this function:
>
> void save_exported (const char *testfile)
> {
> std::ofstream os(testfile);
> xml_oarchive oa(os);
>
> polymorphic_base * pb_ptr_1 = new polymorphic_derived1;
> oa << BOOST_SERIALIZATION_NVP(pb_ptr_1);
>
> polymorphic_base * pb_ptr_2 = new polymorphic_derived2;
> oa << BOOST_SERIALIZATION_NVP(pb_ptr_2);
>
> polymorphic_base * pb_ptr_3 = new polymorphic_derived1;
> oa << BOOST_SERIALIZATION_NVP(pb_ptr_3);
>
> }
>
> The serialization works, but when, I try to deserialyze with this
> function:
>
> void load_exported(const char *testfile)
> {
> std::ifstream is(testfile);
> xml_iarchive ia(is);
>
> polymorphic_base * pb_ptr_1 = NULL;
> ia >> BOOST_SERIALIZATION_NVP(pb_ptr_1);
>
> polymorphic_base * pb_ptr_2 = NULL;
> ia >> BOOST_SERIALIZATION_NVP(pb_ptr_2);
>
> polymorphic_base * pb_ptr_3 = NULL;
> ia >> BOOST_SERIALIZATION_NVP(pb_ptr_3);  // <= exception
>
> }
>
> an exception is thrown on the deserialization of the second object of
> type polymorphic_derived1 but it works for the first one.
>
> in the file basic_archive.cpp, line 466 :  "pending_bis = &
> bpis_ptr->get_basic_serializer();"
> bpis_ptr is null.
>
> It seems that the deserialization of the object of type
> polymorphic_derived2 (derived from polymorphic_derived1) has broken
> the part of table cobject_id_vector concerning polymorphic_derived1.
>
> If polymorphic_derived2 is defined in the first dll, there is no
> problem.
>
> Is it possible to make it works with 2 dll?

probably, but would required some investigation.

Robert Ramey

>
> Regards, Yohan
>
>
>
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