[Boost-users] Serialization v1.33.0 and Serializing derived classes through base class

From: David Parks (davidp_at_[hidden])
Date: 2005-12-03 22:56:56

I'm having a newbie issue with serialization on a derived class with a 
virtual function.  I'm using the 1.33.0 build on VS 7.1.
I've shrunken my code to a micro-version of what I tried to do.  Here I 
have two classes, A and B, where B is a subclass of A.  They share a 
virtual function (ie B overrides dumpFunc in A).  I've registered B with 
BOOST_CLASS_EXPORT(B).  I've turned on RTTI in VS 7.1 (/GR or 
whatever).  Still, I get a run time assert error in the boost library 
telling me that the derived/base relationship wasn't registered.  Here's 
the code.  I'll try to spell out the error below.

#include <string>
#include <fstream>

#include <boost/archive/tmpdir.hpp>

#include <boost/archive/text_iarchive.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/serialization/export.hpp>
#include <boost/serialization/base_object.hpp>
#include <boost/serialization/utility.hpp>
#include <boost/serialization/vector.hpp>

class A;
class B;

class A
{
   friend class boost::serialization::access;

   template<class Archive>
       void serialize(Archive & ar, const unsigned int version)
   {
       ar & m_className;
   };
   std::string m_className;
public:
   A()
   {
       m_className = "ClassA\n";
   };
   virtual void dumpFunc() {};
};

class B : public A
{
   friend class boost::serialization::access;

   template<class Archive>
       void serialize(Archive & ar, const unsigned int version)
   {
       ar & m_classNameB;
   };
   std::string m_classNameB;
public:
   B()
   {
       m_classNameB = "ClassB\n";
   };
   virtual void dumpFunc() {};
};

BOOST_CLASS_EXPORT(B)

void main()
{
   std::vector<A *> vecA;
   B *b=new B();
   vecA.push_back(b);

   std::ofstream ofs("saveFile.sav");
   boost::archive::text_oarchive oa(ofs);
   oa & vecA;

   delete b;
}

The following is a stack trace of where it hits the assert.  The key 
thing to note is that save_pointer_type bails out after deciding that 
class B was not registered.  I'm hoping that this is a rookie error but 
I just can't see it.  Thanks.

    kernel32.dll!7c81eb33()        kernel32.dll!7c81eb33()        
junkProject.exe!_CxxThrowException(void * pExceptionObject=0x0012de10, 
const _s__ThrowInfo * pThrowInfo=0x004f8400)  + 0x39    C++
 >    
junkProject.exe!boost::throw_exception<boost::archive::archive_exception>(const 
boost::archive::archive_exception & e={...})  Line 40    C++
    
junkProject.exe!boost::archive::detail::save_pointer_type<boost::archive::text_oarchive,A 
*>::polymorphic<A>::save(boost::archive::text_oarchive & ar={...}, const 
A & t={...}, const boost::archive::detail::basic_pointer_oserializer * 
bpos_ptr=0x00504544)  Line 410 + 0x34    C++
    
junkProject.exe!boost::archive::detail::save_pointer_type<boost::archive::text_oarchive,A 
*>::save<A>(boost::archive::text_oarchive & ar={...}, const A & t={...}, 
const boost::archive::detail::basic_pointer_oserializer * 
bpos_ptr=0x00504544)  Line 438 + 0x11    C++
    
junkProject.exe!boost::archive::detail::save_pointer_type<boost::archive::text_oarchive,A 
*>::invoke(boost::archive::text_oarchive & ar={...}, A * const 
t=0x00323bb0)  Line 466 + 0x11    C++
    junkProject.exe!boost::archive::save<boost::archive::text_oarchive,A 
*>(boost::archive::text_oarchive & ar={...}, A * const & t=0x00323bb0)  
Line 535 + 0xf    C++
    
junkProject.exe!boost::archive::basic_text_oarchive<boost::archive::text_oarchive>::save_override<A 
* const>()  Line 78 + 0x15    C++
    
junkProject.exe!boost::archive::detail::interface_oarchive<boost::archive::text_oarchive>::operator<<<A 
* const>()  Line 86    C++
    junkProject.exe!boost::serialization::nvp<A * 
const>::save<boost::archive::text_oarchive>()  Line 78    C++
    
junkProject.exe!boost::serialization::access::member_save<boost::archive::text_oarchive,boost::serialization::nvp<A 
* const> const >()  Line 94    C++
    
junkProject.exe!boost::serialization::detail::member_saver<boost::archive::text_oarchive,boost::serialization::nvp<A 
* const> >::invoke(boost::archive::text_oarchive & ar={...}, const 
boost::serialization::nvp<A * const> & t={...}, const unsigned int 
file_version=0)  Line 43 + 0x11    C++
    
junkProject.exe!boost::serialization::split_member<boost::archive::text_oarchive,boost::serialization::nvp<A 
* const> >(boost::archive::text_oarchive & ar={...}, 
boost::serialization::nvp<A * const> & t={...}, const unsigned int 
file_version=0)  Line 69 + 0x11    C++
    junkProject.exe!boost::serialization::nvp<A * 
const>::serialize<boost::archive::text_oarchive>()  Line 87 + 0x34    C++
    
junkProject.exe!boost::serialization::access::serialize<boost::archive::text_oarchive,boost::serialization::nvp<A 
* const> >()  Line 110    C++
    
junkProject.exe!boost::serialization::serialize<boost::archive::text_oarchive,boost::serialization::nvp<A 
* const> >(boost::archive::text_oarchive & ar={...}, 
boost::serialization::nvp<A * const> & t={...}, const unsigned int 
file_version=0)  Line 81 + 0x11    C++
    
junkProject.exe!boost::serialization::serialize_adl<boost::archive::text_oarchive,boost::serialization::nvp<A 
* const> >(boost::archive::text_oarchive & ar={...}, 
boost::serialization::nvp<A * const> & t={...}, const unsigned int 
file_version=0)  Line 140 + 0x18    C++
    
junkProject.exe!boost::archive::detail::save_non_pointer_type<boost::archive::text_oarchive,boost::serialization::nvp<A 
* const> >::save_only::invoke(boost::archive::text_oarchive & ar={...}, 
const boost::serialization::nvp<A * const> & t={...})  Line 256 + 0xf    
C++
    
junkProject.exe!boost::archive::detail::save_non_pointer_type<boost::archive::text_oarchive,boost::serialization::nvp<A 
* const> >::invoke(boost::archive::text_oarchive & ar={...}, const 
boost::serialization::nvp<A * const> & t={...})  Line 321 + 0xd    C++
    
junkProject.exe!boost::archive::save<boost::archive::text_oarchive,boost::serialization::nvp<A 
* const> >(boost::archive::text_oarchive & ar={...}, const 
boost::serialization::nvp<A * const> & t={...})  Line 535 + 0xd    C++
    
junkProject.exe!boost::archive::basic_text_oarchive<boost::archive::text_oarchive>::save_override<boost::serialization::nvp<A 
* const> const >()  Line 78 + 0x15    C++
    
junkProject.exe!boost::archive::detail::interface_oarchive<boost::archive::text_oarchive>::operator<<<boost::serialization::nvp<A 
* const> const >()  Line 86    C++
    
junkProject.exe!boost::serialization::stl::save_collection<boost::archive::text_oarchive,std::vector<A 
*,std::allocator<A *> > >(boost::archive::text_oarchive & ar={...}, 
const std::vector<A *,std::allocator<A *> > & s={...})  Line 44    C++
    
junkProject.exe!boost::serialization::save<boost::archive::text_oarchive,A 
*,std::allocator<A *> >(boost::archive::text_oarchive & ar={...}, const 
std::vector<A *,std::allocator<A *> > & t={...}, const unsigned int 
__formal=0)  Line 49 + 0xd    C++
    
junkProject.exe!boost::serialization::free_saver<boost::archive::text_oarchive,std::vector<A 
*,std::allocator<A *> > >::invoke(boost::archive::text_oarchive & 
ar={...}, const std::vector<A *,std::allocator<A *> > & t={...}, const 
unsigned int file_version=0)  Line 45 + 0x18    C++
    
junkProject.exe!boost::serialization::split_free<boost::archive::text_oarchive,std::vector<A 
*,std::allocator<A *> > >(boost::archive::text_oarchive & ar={...}, 
std::vector<A *,std::allocator<A *> > & t={...}, const unsigned int 
file_version=0)  Line 74 + 0x11    C++
    
junkProject.exe!boost::serialization::serialize<boost::archive::text_oarchive,A 
*,std::allocator<A *> >(boost::archive::text_oarchive & ar={...}, 
std::vector<A *,std::allocator<A *> > & t={...}, const unsigned int 
file_version=0)  Line 76 + 0x11    C++
    
junkProject.exe!boost::serialization::serialize_adl<boost::archive::text_oarchive,std::vector<A 
*,std::allocator<A *> > >(boost::archive::text_oarchive & ar={...}, 
std::vector<A *,std::allocator<A *> > & t={...}, const unsigned int 
file_version=0)  Line 140 + 0x18    C++
    
junkProject.exe!boost::archive::detail::oserializer<boost::archive::text_oarchive,std::vector<A 
*,std::allocator<A *> > 
 >::save_object_data(boost::archive::detail::basic_oarchive & ar={...}, 
const void * x=0x0012febc)  Line 151 + 0x2b    C++
    
junkProject.exe!boost::archive::detail::basic_oarchive_impl::save_object(boost::archive::detail::basic_oarchive 
& ar={...}, const void * t=0x0012febc, const 
boost::archive::detail::basic_oserializer & bos={...})  Line 271    C++
    
junkProject.exe!boost::archive::detail::basic_oarchive::save_object(const 
void * x=0x0012febc, const boost::archive::detail::basic_oserializer & 
bos={...})  Line 412    C++
    
junkProject.exe!boost::archive::detail::save_non_pointer_type<boost::archive::text_oarchive,std::vector<A 
*,std::allocator<A *> > 
 >::save_standard::invoke(boost::archive::text_oarchive & ar={...}, 
const std::vector<A *,std::allocator<A *> > & t={...})  Line 264    C++
    
junkProject.exe!boost::archive::detail::save_non_pointer_type<boost::archive::text_oarchive,std::vector<A 
*,std::allocator<A *> > >::invoke(boost::archive::text_oarchive & 
ar={...}, const std::vector<A *,std::allocator<A *> > & t={...})  Line 
321 + 0xd    C++
    
junkProject.exe!boost::archive::save<boost::archive::text_oarchive,std::vector<A 
*,std::allocator<A *> > >(boost::archive::text_oarchive & ar={...}, 
const std::vector<A *,std::allocator<A *> > & t={...})  Line 535 + 
0xd    C++
    
junkProject.exe!boost::archive::basic_text_oarchive<boost::archive::text_oarchive>::save_override<std::vector<A 
*,std::allocator<A *> > const >()  Line 78 + 0x15    C++
    
junkProject.exe!boost::archive::detail::interface_oarchive<boost::archive::text_oarchive>::operator<<<std::vector<A 
*,std::allocator<A *> > const >()  Line 86    C++
    
junkProject.exe!boost::archive::detail::interface_oarchive<boost::archive::text_oarchive>::operator&<std::vector<A 
*,std::allocator<A *> > >(std::vector<A *,std::allocator<A *> > & 
t={...})  Line 97    C++
    junkProject.exe!main()  Line 65    C++
    junkProject.exe!mainCRTStartup()  Line 259 + 0x19    C
    kernel32.dll!7c816d4f()        ntdll.dll!7c915b4f()        
kernel32.dll!7c8399f3()   

- David