Re: [Boost-users] Serialization of a std::vector<boost::shared_ptr< A> > throws unregistered_class exception

Subject: Re: [Boost-users] Serialization of a std::vector<boost::shared_ptr< A> > throws unregistered_class exception
From: Robert Ramey (ramey_at_[hidden])
Date: 2009-03-21 02:09:11

Consider including the following

BOOST_CLASS_EXPORT(House);
BOOST_CLASS_EXPORT(Hospital);

Robert Ramey

Benoit Gagnon wrote:
> On Mar 19, 10:26 am, Benoit Gagnon <b.gag..._at_[hidden]> wrote:
>> On Mar 19, 9:58 am, "Robert Ramey" <ra..._at_[hidden]> wrote:
>>
>>> Depending on which version of boost you're using. You may have
>>> to include a special macro - look into serialization/shared_ptr.hpp
>>> at the end.
>>
>>> Robert Ramey
>>
>> I'm using Boost 1.34.1.
>> The only macro I see in serialization/shared_ptr.hpp is
>> BOOST_SERIALIZATION_SHARED_PTR.
>>
>> Am I missing something?
>>
>
> I still haven't figured this out, if anyone has clues...
> Should I make a wrapper class around the std::vector and implement
> serialization for it?
>
>>> Benoit Gagnon wrote:
>>>> Given the following classes:
>>
>>>> class Building { ... };
>>>> class House : public Building { ... };
>>>> class Hospital : public Building { ... };
>>
>>>> With appropriate serialization method templates such as:
>>
>>>> class House: public Building {
>>>> friend class boost::serialization::access;
>>>> template<class Archive>
>>>> void serialize(Archive& ar, const unsigned int version ) {
>>>> ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP( Building );
>>>> ar & BOOST_SERIALIZATION_NVP( mNumBedrooms );
>>>> ar & BOOST_SERIALIZATION_NVP( mNumBathrooms );
>>>> }
>>>> ...
>>
>>>> I have the following registrations in main.cpp where the archiving/
>>>> restoring is performed:
>>
>>>> BOOST_SERIALIZATION_SHARED_PTR( Building )
>>>> BOOST_SERIALIZATION_SHARED_PTR( House )
>>>> BOOST_SERIALIZATION_SHARED_PTR( Hospital )
>>
>>>> In main.ccp, I would like to serialize a std::vector<
>>>> boost::shared_ptr< Building > > object.
>>>> Like this:
>>
>>>> std::vector< boost::shared_ptr< Building > > buildings;
>>>> ...
>>>> std::ofstream ofs( "archive.txt" );
>>>> boost::archive::text_oarchive oa( ofs );
>>>> oa & BOOST_SERIALIZATION_NVP( buildings );
>>
>>>> This compiles correctly but fails at runtime with a
>>>> "unregistered_class" exception. The individual classes (Building,
>>>> House, Hospital) can be serialized and restored fine individually.
>>>> That is true for objects, pointers and shared_ptr. A vector of
>>>> plain pointers to any of those types also works fine. But a vector
>>>> of shared_ptr to any of those types fails at runtime..
>>
>>>> What kind of registration must be done to achieve this?
>>
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