Hi, I hope what I'm saying here makes sense and won't be considered flooding. While trying to check the reason for BOOST_CLASS_EXPORT not working with templates, I found out the problem is simply a preprocessor issue - it treats each comma as a seperation between values, so it treats a template (as below) as two inputs (and the MACRO accepts only one). We implemented BOOST_CLASS_EXPORT_WITH_TWO_VALS, and it worked fine with the template argument below, saving us the need to expand the macro for each instantiation. Is there anything we're missing here? Is support for this planned in future Boost releases? Thanks for your time, Yair Lifshitz Intel Israel ----- Forwarded Message ---- From: Robert Ramey <ramey@rrsd.com> To: boost-users@lists.boost.org Sent: Thursday, May 8, 2008 7:49:08 AM Subject: Re: [Boost-users] Boost serialization: how to register template derivedclass what you would really need is something like BOOST_CLASS_EXPORT(KukuBase<int, 5>); BUT the the shorthand macro BOOST_CLASS_EXPORT doesn't like template instantiations so you'll have to expand the macro "by hand" for the class for each set of template parameters used. This is explained in the manual. Robert Ramey "ari vol" <avf99avf@yahoo.com> wrote in message news:9202.25698.qm@web45110.mail.sp1.yahoo.com... Hey, Boost serialization <http://www.boost.org/doc/libs/1_35_0/libs/serialization/doc/index.html> : 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 <http://us.mg3.mail.yahoo.com/dc/exceptions.html> 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_oarch ive, foo>::save_standard::invoke () #21 0x0000000000400c6f in boost::archive::detail::save_non_pointer_type<boost::archive::text_oarch ive, 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 ________________________________ From: Voloshin, Ariella Sent: Tuesday, May 20, 2008 11:10 AM To: Lifshitz, Yair Subject: RE: Hey Yes I will use it, I guess you will need to register the: boost-users@lists.boost.org. The guy that wrote the boost serialization library is Robert Ramey ramey@rrsd.com. If you like to answer from my email thread please let me know. ________________________________ From: Lifshitz, Yair Sent: Friday, May 16, 2008 8:55 AM To: Voloshin, Ariella Cc: Lifshitz, Yair Subject: RE: Hey Great! :) So I hope you're going to use it. Can you send me the Boost owner's mail - I want to have a look and maybe have a chat with him. ________________________________ From: Voloshin, Ariella Sent: Thursday, May 15, 2008 11:01 PM To: Lifshitz, Yair Subject: Hey It is working, Took some time to compile, long story but it is working. The string is also ok. Thanks, -Ariella --------------------------------------------------------------------- Intel Israel (74) Limited This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.