From: Ingo Nolden (nuttygraphics_at_[hidden])
Date: 2007-05-15 15:15:34
Hi,
I am a bit confused about the purpose of GUID. My understanding was,
that it is a user defined id for a class, so that the serialization
mechanism knows what types to instanciate on load. I somehow assumed
it to be a replacement (or equivalent) of the numbers in the class_id
attributes.
by inserting:
BOOST_CLASS_EXPORT_GUID( bus_schedule, "BusSchedule" );
I'd expected to find something like:
<schedule class_id="BusSchedule"
in the xml file, but I get only:
<schedule class_id="1"
I know that another purpose of the BOOST_CLASS_EXPORT family of
macros is to instanciate the <Archive, T*> pairs, but what is the
"BusSchedule" string then for.
If my assumption was right, where do I have to place the macros
exactly then. I tried at the end of the header with the classes. I
then tried at the beginning, after the includes. That didn't work
unless I forward declared the classes (no surprise really).
Also, is there some docs/tutorials/further reading on xml archives. I
am probably going to make my own archive, and need to understand more
about the mechanism.
Thanks for your help,
Ingo