[Boost-users] [serialization] Export macro doesnt work

Hi I was trying to use BOOST_CLASS_EXPORT for all my classes in order to save them but I always got unregistered class error. So I used oa.register_type<object>(); for the class that was causing the error and problem solved. But why doesnt the BOOST_CLASS_EXPORT macro work? Why I need to use oa.register_type<object>(); ? Im using Boost 1.46.1 Thanks