Re: [boost] serialization: class version

From: Mikhail Kubzin (mikhail.kubzin_at_[hidden])
Date: 2005-12-08 14:19:03

It looks like I misunderstood the error message or/and didn't read the
documentation carefully.

When I include #include <boost/serialization/version.hpp> line in my A.h
file I get a compilation error message saying that it is impossible to
include version.hpp before archive headers:

c:\Program Files\boost\boost\archive\basic_archive.hpp(21): fatal error
C1189: #error :  "no serialization headers my precede any archive headers"

That's why I have to include <boost/archive/....> headers. Since class A is
used in a lot of places I get unacceptable compilation time.

Could you please advise me how to insert class version information into A.h
file without including  huge archive headers?

Thanks,
Mikhail

"Robert Ramey" <ramey_at_[hidden]> wrote in message
news:dn9mli$ljh$1_at_sea.gmane.org...
> Hmmm - my question is:
>
> My intention has always been that serialization "features" for class A
> always be defined in A.h.
> That way the correct and consistent set of "features" would be used by all
> programs
> which use class A.  So I would expect A.h to look like:
>
> #include <boost/serialization/version.hpp>
>
> namespace boost {
>  namespace serialization {
>      class access;
>  }
> }
> class A
> {...
> };
> BOOST_CLASS_VERSION(A, 1)
>
> which  I think would solve your problem.
>
> I would not expect this to slow down compilation significantly unless
> as long as no <boost/archive/....> headers are not included.
>
> Robert Ramey
>
> Mikhail Kubzin wrote:
> > I use boost serialisation in my project and I need to serialise a
> > vector of pointers (boost::shared_ptr) to a base class. The base class
> > is declared in one dll in the following way:
> >
> > A.h:
> >
> > namespace boost {
> >  namespace serialization {
> >      class access;
> >  }
> > }
> > class A
> > {...
> > };
> >
> > A.cpp
> > #include <... boost serialization headers .. >
> > BOOST_CLASS_VERSION(A, 1)
> >
> > ....
> >
> > In another dll I declare class B derived from A declared and
> > implemented in the same manner ( .h files do not include boost
> > serialization headers). The problem is that inside the sirialisation
> > (save/load) function of the derived class I get correct file_version
> > value while in the serialisation function of the base class
> > file_version is 0.
> >
> > I call serialization function of the base class as advised in the
> > documentation:
> > ar & boost::serialization::base_object<A>(*this);
> >
> > However, if I insert BOOST_CLASS_VERSION(A, 1) into B.cpp then
> > file_version in A's serialisation function is initialised properly.
> >
> > It is a pain to update the version of the base class in all derived
> > classes from one side, it is also impractical to include all boost
> > headers and class version information into .h files since the
> > compilation time grows dramatically and the size of the executables
> > increases several times.
> >
> > Any thoughts and suggestions are welcome!
> > Thank you in advance,
> >
> > Mikhail
> >
> >
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