Re: [Boost-users] xml serialization : compilation fails

Hughes, James a écrit :

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-----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Cyril Sent: 04 May 2007 15:02 To: boost-users@lists.boost.org Subject: [Boost-users] xml serialization : compilation fails

Hello all, I have a problem while attempting to serialize a simple object using xml (text works fine !).

This is my code :

// SomeData.h #include #include

class OBJECTS_API InternalData { public: InternalData(); virtual ~InternalData(); virtual int getInternals() const = 0; private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { } };

class OBJECTS_API RealData : public InternalData { public: RealData(int internals=0); int getInternals() const; private: int _internals;

friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(InternalData) & BOOST_SERIALIZATION_NVP(_internals); } };

class OBJECTS_API SomeData { public: SomeData(int internals=0); ~SomeData(); InternalData* getInternals() const; private: InternalData* _data; static InternalData* createData(int internals);

friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { //ar.register_type(static_cast(0)); ar & BOOST_SERIALIZATION_NVP(_data); } }; ////////////////// // somewhere else const SomeData data(4); boost::archive::xml_oarchive xoa(archive); //archive is a file stream xoa << data;

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This fails to compile because : // basic_xml_oarchive.hpp // Anything not an attribute and not a name-value pair is an // error and should be trapped here. template<class T> void save_override(T & t, BOOST_PFTO int) { // If your program fails to compile here, its most likely due to // not specifying an nvp wrapper around the variable to // be serialized. BOOST_STATIC_ASSERT(0 == sizeof(T)); }

I can't see why my code isn't correct according to that constraint. Any help ?

Thanks in advance.

I just had a very similar (if not the same) problem - I spent some time assigning GUID's to all the classes, and ensuring all base classes were correctly serialised using BOOST_SERIALIZATION_BASE_OBJECT_NVP and that seems to have fixed the problem. Whether it was that or something else that got changed during the figuring out period is anyones guess!!

See BOOST_CLASS_EXPORT_GUID

James

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It seems that it's not the solution. I tried to add BOOST_CLASS_EXPORT_GUID call for each class in the header, but that doesn't change the problem. Another suggestion ? cd