Re: [Boost-users] XML Serialization Traits Question

From: Robert Ramey (ramey_at_[hidden])
Date: 2006-07-26 12:13:34

"William Bardon" <wbardon_at_[hidden]> wrote in message 
news:C73E689C9FCF884B9A550ECFADA0721C087D3E_at_exchange.cab-cds.org...
I have read both the Boost Serialization online documentation and the 
archives of the Boost-Users mailing list looking for guidance, but I haven't 
found anything relevant.  I see how to use BOOST_CLASS_TRACKING and 
BOOST_CLASS_IMPLEMENTATION to remove version tracking attributes from the 
XML tags.

Usage of these macros does a lot more than remove attributes from the tags.

I want to go in the opposite direction.  I notice that the class_id and 
version attributes only appear the first time an object of a particular 
class is serialized.  I want to force the version attribute to appear in 
every object's attribute list.

Do I need to derive a custom archive to do this?

yes

I have looked at the source code for serialization, but I have trouble 
plowing through all of the macros, template expansions, and overloaded 
functions to locate the specific part that controls whether class traits are 
stored as attributes in a particular XML tag.

I sympathize - its hard to follow.  And I wrote it.  Here are some hints:

a) look at demo_fast_archive.cpp to see a model of how one can derive from
an existing archive.
b) You'll want to derive from xml_oarchive_impl<...> to create 
my_xml_oarchive
c) add a "save_override" function to my_xml_oarchive which replaces the 
"save_override" function in
    basic_xml_oarchive.ipp.  Implement this using functions defined 
basic_xml_oarchive.ipp

Good luck -

Robert Ramey

Thanks in advance,
Bill

_______________________________________________
Boost-users mailing list
Boost-users_at_[hidden]
http://lists.boost.org/mailman/listinfo.cgi/boost-users