Re: [Boost-users] serialization and object tracking question...

8 Oct 2007

      Ok I am confused (again)

I changed it to the non-intrusive mode:

namespace boost {
namespace serialization {
template<class Archive>
void serialize(Archive & ar, clients & c, const unsigned int version)
{
    ar & c.client_first_name;  // all std::string
    ar & c.client_middle_initial;
    ar & c.client_last_name;
    ar & c.client_street_address;
}

} // namespace serialization
} // namespace boost

With:
BOOST_CLASS_TRACKING(clients, boost::serialization::track_never)
I receive this error:
boost/serialization/access.hpp:109: error: 'struct clients' has no
member named 'serialize'

Without:
//BOOST_CLASS_TRACKING(clients, boost::serialization::track_never)
I receive this error:
boost/archive/detail/oserializer.hpp:566: error: invalid application
of 'sizeof' to incomplete type
'boost::STATIC_ASSERTION_FAILURE<false>'

Which is what I started with.
What am I missing?

Thanks for any help,
Graham

On 10/7/07, Graham Reitz <graham.cpp@gmail.com> wrote:
...
I think the issue is that the structure clients used in class client_i
as m_client doesn't have any information on how do serialize itself.
I don't have control over the clients structure, as it is created for
me by the mysql++ macro.  It is a simple structure with public access
to its internals which are primitives.
Just use the non-intrusive serialization method?  Or is there a more
convenient method?
Thanks,
Graham
On 10/7/07, Graham Reitz <graham.cpp@gmail.com> wrote:
...
I am having trouble wrapping my head around object tracking for serialization.
I see how to change the default behavior:
BOOST_CLASS_TRACKING(my_class, boost::serialization::track_never)
...but based on the error below how do I determine what kind of object
tracking is needed?
oserializer.hpp:566: error: invalid application of 'sizeof' to
incomplete type 'boost::STATIC_ASSERTION_FAILURE<false>'
inline void save(Archive & ar, T &t){
    // if your program traps here, it indicates taht your doing one of
the following:
    // a) serializing an object of a type marked "track_never" through
a pointer.
    // b) saving an non-const object of a type not markd "track_never)
    // Either of these conditions may be an indicator of an error usage of the
    // serialization library and should be double checked.  See documentation on
    // object tracking.
    BOOST_STATIC_ASSERT(check_tracking<T>::value);
The following is the class to be serialized:
class client_i
{
private:
    friend class boost::serialization::access;
template<class Archive>
    void serialize(Archive & ar, const unsigned int version)
    { ar & m_client; }
clients m_client;
public:
client_i() {};
    client_i(clients c) : m_client(c) {};
    ~client_i() {};
};
clients is a mysql++ specialized sql structure that is created via one
of the mysql++ macros, i.e. sql_create_N().
Any help understanding this would be greatly appreciated.
Thanks,
Graham