save_null_pointer is not a virtual function and not meant to be overriden in the derived class. It is an implemenation detail. Hence the cast to the base class reference. You shouldn't have a function called save_null_pointer in your derived class. Look at the other polymorphic archives for examples. Robert Ramey Sergey Skorniakov wrote:
Hello, I'm developing custom polymorphic archive and noticed that virtual function save_null_pointer is never called for my archive.
I think the problem is in save_pointer_type::invoke (boost/archive/detail/oserializer.hpp):
const basic_pointer_oserializer * bpos_ptr = register_type(ar, * t); if(NULL == t){ basic_oarchive & boa = boost::smart_cast_reference<basic_oarchive &>(ar); boa.save_null_pointer(); save_access::end_preamble(ar); return; } save(ar, * t, bpos_ptr);
I see no reasons to use smart_cast here. I think, the code sholud be:
const basic_pointer_oserializer * bpos_ptr = register_type(ar, * t); if(NULL == t){ ar.save_null_pointer(); save_access::end_preamble(ar); return; } save(ar, * t, bpos_ptr);
Please correct this in the next release of library (or explain). _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost