RE: [Boost-users] Re: Re: serialization

From: Damien * (damdai_at_[hidden])
Date: 2005-04-04 00:11:01

> >> Damien * wrote:
> >>> has anyone seen this compile error before, and know how to fix it?
> >>>
> >>> 
>/usr/local/include/boost-1_32/boost/archive/detail/iserializer.hpp:428:
> >>> no type named `type' in `struct 
>boost::mpl::eval_if<boost::is_abstract<MyClass>,
> >>> 
>boost::mpl::identity<boost::archive::detail::load_pointer_type<boost::archive::text_iarchive,
> >>> MyClass*>::abstract<MyClass> >,
> >>> 
>boost::mpl::identity<boost::archive::detail::load_pointer_type<boost::archive::text_iarchive,
> >>> MyClass*>::non_abstract<MyClass> > >'
> >>>
> >>> im trying to serialize a polymorphic class that has a pointer to
> >>> another class of the same type in it. if i comment out that line in
> >>> the serialization function, the error goes away.

> >> is MyClass abstract? That is, does it have a pure abstract function
> >> in it ( func() = 0;)?  Check BOOST_IS_ABSTRACT in the documentation.
> >>
> >> Robert Ramey

> > MyClass is not abstract. it has virtual functions, but no pure virtual
> > functions. if i use that macro however, the error goes away, but i
> > then get this runtime assertion failure when it tries to serialize
> > out.
> >
> > /usr/local/include/boost-1_32/boost/archive/detail/oserializer.hpp:432:
> > static void boost::archive::detail::save_pointer_type<Archive,
> > TPtr>::polymorphic<T>::save(Archive&, const T&, const
> > boost::archive::detail::basic_pointer_oserializer*) [with T = MyClass,
> > Archive = boost::archive::binary_oarchive, TPtr = MyClass*]: Assertion
> > `__null != bpos_ptr' failed.

>Hmm, are we serializing through a base class or a derived class?  If 
>through
>a base class has the derived class been "registered" via register(..) or 
>via
>BOOST_CLASS_EXPORT?
>
>Robert Ramey

that appears to have done the trick. thanks a bunch. i dont understand why i 
had to use the BOOST_IS_ABSTRACT macro for a class that wasnt abstract 
though. oh well. thanks again.