more info: On Oct 27, 2007, at 3:36 PM, Hugh Hoover wrote:
I have a curious problem that's just sprung up, after changing from using plain-old-pointers to using boost::shared_ptrs internally in my data structures (stl hash_map and map) The problem is that while the XML archive works correctly, both text and binary fail (they all used to work).
This is using gcc 4.0.1 on darwin and VC8 on windows, boost version is 1.34.1
The failure occurs while unserializing an archive, specifically when trying to read back a shared_ptr to an already unserialized object. In the archive, it shows the object (pointer) as an object_reference (the same reference id in XML and text). While the XML version reads the pointer back correctly, the text version fails and returns NULL. I have not determined the exact reason why the text version fails (it doesn't throw, just returns NULL). The serialization does not appear to have any problems.
The proximate cause of the problem is in void_upcast, which does not find a pre-registered pair of types matching the base and derived types passed in from load_pointer_type::invoke. I'm having a hard time understanding how that could be... I've called void_cast_register for the type pair, so it SHOULD be registered - and the xml_iarchive was able to reconstruct the object properly. Any suggestions?