id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11593	undocumented export problem	mstarzycki@…	Robert Ramey	"when I started using the serialisation I had a problem with duplicated symbols being produced by 
BOOST_CLASS_EXPORT_GUID called twice from different compilation units. 
I have not used the macro as said in tutorial in the definition of class but thought the .h file will be a better place for it.

I think it would be great if either one of those would happen:
- the problem with duplicated guid if the BOOST_CLASS_EXPORT_GUID is called twice from different CU 
- the prevention mechanism would be incorporated in macro (for instance if the guid is registered with a same class, second macro is expanded into nothing)

If the 2nd option is impossible if the documentation would explicitly say that such code:
duplicate symbol __ZN5boost7archive6detail12extra_detail9init_guid is the result of registering class twice 
it could save some time with investigation.
"	Feature Requests	closed	To Be Determined	serialization	Boost 1.58.0	Cosmetic	invalid	serialization