Re: [boost] [serialization] Support for multiple class name strings

From: Zach Laine (whatwasthataddress_at_[hidden])
Date: 2007-03-23 10:46:26

On 3/22/07, Robert Ramey <ramey_at_[hidden]> wrote:
> How about sending me the whole file.  I don't have 1.33 on my machine
> and export.hpp is ALOT different in the HEAD branch where any changes
> would be made.
>
> Robert Ramey
>
> Zach Laine wrote:
> > On 3/15/07, Zach Laine <whatwasthataddress_at_[hidden]> wrote:
> >> I did something stupid with my serialization code.  I blithely
> >> changed the names of several polymorphic classes everywhere they
> >> appeared in the code, since they had moved out of a class into that
> >> class's namespace (e.g. SomeNS::View::Primitive became
> >> SomeNS::Primitive). Several months later, I discovered that I could
> >> no longer read old binary archives, because I was using
> >> Boost.Serialization's BOOST_CLASS_EXPORT() macro, and this macro was
> >> now registering the Primtive type with the name-string "Primitive",
> >> instead of "View::Primitive", which is how it was saved in the
> >> oldest archives.
> >>
> >> Since there is a 1-1 mapping between name-strings and types, and
> >> since most of the Serialization code uses static/global data, I
> >> cannot currently support both the archives saved with and the
> >> archives saved without the "View::" in the same program.
> >>
> >> Since I suspect this is not the first time someone has done this, nor
> >> the last time someone will do so, is there a way to fix this using
> >> the current library?  If not, would it be technically possible to
> >> add a BOOST_CLASS_EXPORT_ALIAS() macro, or some such?  If it is
> >> possible, I'm willing to supply the implementation.
> >>
> >> Zach Laine
> >>
> >
> > Robert, is there any kind of verdict on the alias patch?  I'd like to
> > finish this topic before the thread gets too stale.
> >
> > Zach Laine
> > _______________________________________________
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>
>
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The patch is actually against 5 files, so I'm leaving it as a patch.
This time the patch is against HEAD.  Find the patch and test program
attached.

Zach Laine