[Boost-users] Re: Serialization, shared_ptr and namespaces

Thanks for all your replies. I will try the proposed ideas and pinters to documentation on the weekend and report back. Cheers, Jan Eickmann 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