[Boost-users] Boost serialization: how to register template derived class

From: ari vol (avf99avf_at_[hidden])
Date: 2008-05-07 04:25:59

Hey,
Boost serialization: how to register template derived class.
The problem in general:
I have the following classes:
- Virtual based class:
 class TemplateBase {  }
- Derived class:
template <class KUKU, int KUKUINT>
class KukuBase : public TemplateBase{ }
 
And I am trying to serialize the derived class KukuBase<KUKU, KUKUINT>through a pointer of the base type (polymorphism…).
The problem is that I can not find a way to register the class KukuBase<KUKU, KUKUINT> and thus get unregistered_class exception. 
How to make it works?
 
The cpp file:
 
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
 
// Serialization                                                               
#include <boost/serialization/string.hpp>
#include <boost/serialization/vector.hpp>
#include <boost/serialization/access.hpp>
#include <boost/serialization/base_object.hpp>
#include <boost/serialization/serialization.hpp>                               
#include <boost/serialization/export.hpp>    
 
#include <fstream>
 
class TemplateBase
{
public:
 TemplateBase() : mI(0) {}
 virtual TemplateBase* Clone() = 0;
 
 int mI;
 
private:
 friend class boost::serialization::access;
 template<class Archive>
 void serialize(Archive & ar, const unsigned int version)
 {
  ar & mI;
 } 
};
 
template <class KUKU, int KUKUINT>
class KukuBase : public TemplateBase
{
public:
  KukuBase() : mZ(1) {}
  TemplateBase* Clone() { return new KukuBase<KUKU, KUKUINT>(*this); }
 
private:
  friend class boost::serialization::access;
  template<class Archive>
  void serialize(Archive & ar, const unsigned int version)
  {
    ar & boost::serialization::base_object<TemplateBase>(*this);
    ar & mZ;
  }
 
  float mZ;
};
 
class foo { 
public:
  foo() : mT(new KukuBase<int, 5>) {};
  
  template<class Archive>
  void serialize(Archive & ar, const unsigned int version)
  {
    ar & mT;
  }
 
  TemplateBase* mT;
};
 
BOOST_CLASS_EXPORT(foo);
//BOOST_CLASS_EXPORT((KukuBase));
BOOST_CLASS_EXPORT(TemplateBase);
 
int main()
{                                                                           
  std::ofstream ofs("/tmp/kuku");                                     
  boost::archive::text_oarchive ar(ofs);                             
 
  const foo bar;
  ar << bar;
}  
 
 
The program returns:
          terminate called after throwing an instance of 'boost::archive::archive_exception'
what():  unregistered class
Abort
 
And the stuck shows:
 (gdb) bt
#0  0x000000000049e409 in kill ()
#1  0x0000000000470582 in abort () at ../sysdeps/generic/abort.c:88
#2  0x0000000000461bf8 in __gnu_cxx::__verbose_terminate_handler ()
#3  0x000000000045e216 in __cxxabiv1::__terminate ()
#4  0x000000000045e243 in std::terminate ()
#5  0x000000000045e343 in __cxa_throw ()
#6  0x000000000040190c in boost::throw_exception<boost::archive::archive_exception> ()
#7  0x00000000004015e1 in boost::archive::detail::save_pointer_type<boost::archive::text_oarchive, TemplateBase*>::polymorphic<TemplateBase>::save ()
#8  0x000000000040152d in boost::archive::detail::save_pointer_type<boost::archive::text_oarchive, TemplateBase*>::save<TemplateBase> ()
#9  0x000000000040142e in boost::archive::detail::save_pointer_type<boost::archive::text_oarchive, TemplateBase*>::invoke ()
#10 0x00000000004013aa in boost::archive::save<boost::archive::text_oarchive, TemplateBase*> ()
#11 0x0000000000401344 in boost::archive::basic_text_oarchive<boost::archive::text_oarchive>::save_override<TemplateBase* const> ()
#12 0x00000000004012e8 in boost::archive::detail::interface_oarchive<boost::archive::text_oarchive>::operator<< <TemplateBase* const> ()
#13 0x0000000000401299 in boost::archive::detail::interface_oarchive<boost::archive::text_oarchive>::operator&<TemplateBase*> ()
#14 0x000000000040124c in foo::serialize<boost::archive::text_oarchive> ()
#15 0x0000000000401197 in boost::serialization::access::serialize<boost::archive::text_oarchive, foo> ()
#16 0x0000000000401107 in boost::serialization::serialize<boost::archive::text_oarchive, foo> ()
#17 0x0000000000400f83 in boost::serialization::serialize_adl<boost::archive::text_oarchive, foo> ()
#18 0x00000000004022c6 in boost::archive::detail::oserializer<boost::archive::text_oarchive, foo>::save_object_data ()
#19 0x0000000000405c59 in boost::archive::detail::basic_oarchive_impl::save_object ()
#20 0x0000000000400d43 in boost::archive::detail::save_non_pointer_type<boost::archive::text_oarchive, foo>::save_standard::invoke ()
#21 0x0000000000400c6f in boost::archive::detail::save_non_pointer_type<boost::archive::text_oarchive, foo>::invoke ()
#22 0x0000000000400aff in boost::archive::save<boost::archive::text_oarchive, foo> ()
#23 0x0000000000400a38 in boost::archive::basic_text_oarchive<boost::archive::text_oarchive>::save_override<foo const> ()
#24 0x000000000040090e in boost::archive::detail::interface_oarchive<boost::archive::text_oarchive>::operator<< <foo const> ()
#25 0x0000000000400423 in main ()
(gdb) Quit
 
 
Thanks,-Ariella


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