Re: [Boost-users] Serialization: problems whensplittingserialize into load / save

From: Robert Ramey (ramey_at_[hidden])
Date: 2007-11-08 11:30:45

The following would work.  However as you already know, the state of the
class when loaded is not going to be the same as the state of the clas when
it was saved.  This suggests that one might want to step back and
consider what he really wants to do.

template<class Archive>
               // do not serialize the lock -- use the default constructor. 
               // we assume that no iterators that lock the cache do exist
when serializing.
               // ar & m_Lock;
               ar & m_LookupId;
               ar & m_LookupName; 
               ar & m_SequenceNumber;
           } 

           template<class Archive>
           void load( Archive &ar, unsigned int version) {
               m_CachedAll = true;
               m_offlineMode = true;
               // do not serialize the lock -- use the default constructor. 
               // we assume that no iterators that lock the cache do exist
when serializing.
               // ar & m_Lock;
               ar & m_LookupId;
               ar & m_LookupName; 
               ar & m_SequenceNumber;
               //reset old state for the case we want to continue working

  "Oliver Kania" <kania.oliver_at_[hidden]> wrote in message news:1262c4ee0711080702u39083c2gec466f83af0d22cf_at_mail.gmail.com...
  Hello and thx
  I guess that means I cannot change class state in my save method.
  That is what I need ! Is there any way around it ?

  regards, Oliver

  On Nov 8, 2007 3:47 PM, Oliver Mutz < omutz_at_[hidden]> wrote:

    Hello Oliver,

    Your save method has to be const. 

    Regards

    Oliver

    ________________________________

    Von: boost-users-bounces_at_[hidden]
    [mailto: boost-users-bounces_at_[hidden]] Im Auftrag von Oliver Kania
    Gesendet: Donnerstag, 8. November 2007 15:16
    An: boost-users
    Betreff: [Boost-users] [Boost Users] Serialization: problems when
    splittingserialize into load / save 

    Hello out there !
    I have an urgent problem concerning boost::serialize.
    I have split the serialize operation into save / load as described
    in the tutorial:
    =================================================== 
       template<class Archive>
               void save( Archive &ar, unsigned int version) {
                   m_offlineMode = true;
                   // we cannot load more when offline --> always cachedAll 
                   bool oldCachedAll = m_CachedAll;
                   m_CachedAll   = true;
                   ar & m_CachedAll;
                   ar & m_offlineMode;
                   // do not serialize the lock -- use the default constructor. 
                   // we assume that no iterators that lock the cache do exist
    when serializing.
                   // ar & m_Lock;
                   ar & m_LookupId;
                   ar & m_LookupName; 
                   ar & m_SequenceNumber;
                   //reset old state for the case we want to continue working
                   m_CachedAll = oldCachedAll;
                   m_offlineMode = false;
               } 

               template<class Archive>
               void load( Archive &ar, unsigned int version) {

                   ar & m_CachedAll;
                   ar & m_offlineMode;
                   // do not serialize the lock -- use the default constructor. 
                   // we assume that no iterators that lock the cache do exist
    when serializing.
                   // ar & m_Lock;
                   ar & m_LookupId;
                   ar & m_LookupName; 
                   ar & m_SequenceNumber;
                   //reset old state for the case we want to continue working
               }
               BOOST_SERIALIZATION_SPLIT_MEMBER()
    =============================================================== 

    The class I serialize is part of a deep class hierarchy that I want to
    serialize as a whole.
    With the standard serialize() it seems to work, but now the compiler complains
    ( when I
    want to perform the actual serialization): 

    error C2662: 'void
    jedox::palo::AbstractCache<C,Exception>::save<Archive>(Archive &,unsigned
    int)' :
    cannot convert 'this' pointer from 'const
    jedox::palo::AbstractCache<C,Exception>' to 
    'jedox::palo::AbstractCache<C,Exception> &'

    AbstractCache is the class containing the above load / save operations

    kind regards,
    Oliver

    _______________________________________________ 
    Boost-users mailing list
    Boost-users_at_[hidden]
    http://lists.boost.org/mailman/listinfo.cgi/boost-users 

------------------------------------------------------------------------------

  _______________________________________________
  Boost-users mailing list
  Boost-users_at_[hidden]
  http://lists.boost.org/mailman/listinfo.cgi/boost-users