I concede this is somewhat confusing. I made the shared_ptr as a case study and several people helped me out with issues such as this. I don't know if all of them have been address. Its better and worse. 1.33 will have much simpler and robust implementation of shared_ptr (and weak_ptr) serialization based on work done by Martin Ecker. I believe it will address these problems. Also, the requirement that serializations be placed in a particular namespace will be relaxed and ADL will work as expected in all cases. I'm currently making it work on the older compilers. I still have pending the issue of backward compatibility so it will be a while yet. As to your particular issue, I'll have to consider it Jan Eickmann wrote:
Hello,
sorry to bump this but I still haven't found a solution or any information on how to use shared_ptr together with serialization.
Anybody can shed some light on this?
Thanks a lot,
Jan Eickmann
Jan Eickmann wrote:
Hi,
I'm trying to serialize a list of shared_ptr's to objects.
Here's a summary of the code I have:
namespace MyNamespace {
class B { //implementation plus standard serialization function };
class A { private: list< shared_ptr<B> > myBs; public: template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & BOOST_SERIALIZATION_NVP(myBs); } };
}
If I just try to serialize it, I get an unregistered_class exception. So I think I have to use BOOST_SHARED_POINTER_EXPORT(_GUID) to register the shared_ptr.
When I include this inside the namespace (please note that the error messages are from my real code, so they have slightly other names:
BOOST_SHARED_POINTER_EXPORT(B)
I get this: f:\xenocide\xenocide\src\common\simulation\simulation.h(108) : error C2059: syntax error : 'string' f:\xenocide\xenocide\src\common\simulation\simulation.h(108) : error C2146: syntax error : missing ';' before identifier 'BOOST_CLASS_EXPORT_GUID' f:\xenocide\xenocide\src\common\simulation\simulation.h(108) : error C2059: syntax error : 'string' f:\xenocide\xenocide\src\common\simulation\simulation.h(109) : error C2143: syntax error : missing ';' before '}'
When I put it outside the namespace I have to use a fully qualified name including the namespace for class B, so it becomes
BOOST_SHARED_POINTER_EXPORT(MyNamespace::B)
Then I get (not Xenocide is here what MyNamespace is in my example): f:\xenocide\xenocide\src\common\simulation\simulation.h(115) : error C2653: '__shared_ptr_Xenocide' : is not a class or namespace name f:\xenocide\xenocide\src\common\simulation\simulation.h(115) : error C2653: '__shared_ptr_Xenocide' : is not a class or namespace name
I also tried various combinations with BOOST_SHARED_POINTER_EXPORT_GUID but it didn't help.
Can someone explain to me how I have to declare shared_ptr's in order for them to work with boost::serialization? I was unable to find some more indepth documentation.
Thanks,
Jan Eickmann