Re: [luabind] Re: Luabind and DLLs: Problem with RTTI

[Stefan S. <Schwarzbach@SilentDreams.de>]

The problems occur when registering classes.

In class.hpp, class_::init(), the following code is executed:
            class_base::init(LUABIND_TYPEID(T)
                , detail::internal_holder_type<HeldType>::apply()
                ,
detail::internal_holder_extractor<HeldType>::apply(detail::type<T>())
                ,
detail::internal_const_holder_extractor<HeldType>::apply(detail::type<T>())
                ,
detail::const_converter<HeldType>::apply(luabind::get_const_holder(crap))
                ,
detail::holder_constructor<HeldType>::apply(detail::type<T>())
                ,
detail::const_holder_constructor<HeldType>::apply(detail::type<T>())
                ,
detail::internal_holder_destructor<HeldType>::apply(detail::type<T>())
                ,
detail::internal_const_holder_destructor<HeldType>::apply(detail::type<T>())
                , detail::internal_holder_size<HeldType>::apply()
                , detail::get_holder_alignment<HeldType>::apply());

LUABIND_TYPEID(T) stands for &typeid(t) an returns different pointers in
different dlls.

When a class is comitted, class_base::commit is called and there tries
to find the base classes in the list of already registered classes:
            for (std::vector<base_desc>::iterator i = m_bases.begin();
                            i != m_bases.end();
                            ++i)
            {
                detail::class_registry* r =
detail::class_registry::get_registry(L);

                // the baseclass' class_rep structure
                detail::class_rep* bcrep = r->find_class(i->type);

                detail::class_rep::base_info base;
                base.pointer_offset = i->ptr_offset;
                base.base = bcrep;

                crep->add_base_class(base);
            }

So when I want to register a class classA in a.dll which inherits a
class classB registered in b.dll, classA cannot find classB.
ClassB is added to the list with typeid(ClassB) called from b.dll.
ClassA gets registered with typeid(ClassA) and typeid(classB) as base
class, but calles from a.dll.
So detail::class_rep* bcrep = r->find_class(i->type) will not find
classB, because i->type and the entry in the list come from typeid calls
from different calls

I hope you understand the problem,
Thanks,
Stefan