Backward compatibility and the Event object model

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• Previous message: rene Scholte: "TControlBar"

I've got some problem with my Event model and its evolution in time.

I used this :

Event 1
{
RBHeader fHeader ;
Int_t fNparticleEM ;
Int_t fNparticleHADR ;
TOrdCollection* fParticleEM ;
TOrdCollection* fParticleHADR ;

...
}

and produced some trees in split mode with this.

Now, I would like to use :

Event 2
{
RBHeader fHeader ;
Int_t fNparticleEM ;
Int_t fNparticleHADR ;
Int_t fNparticleGEANT ;
TOrdCollection* fParticleEM ;
TOrdCollection* fParticleHADR ;
TOrdCollection* fParticleGEANT ;
...
}

I used to think (naively, obviously) that reading back the type 1 trees
would be a matter
of dealing with the class version number in Event::Streamer. But it
seems that this
routine is not called at all when reading back the tree (written in
split mode).

So how can I deal with this evolving event class ? Am I lost or is there
a solution ?

Thanks a lot for your help.

-- 
APHECETCHE Laurent (mailto:aphecetche@ganil.fr)       
GANIL, B.P. 5027, 14076, Caen Cedex 5, France 
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WWW: http://ganp03.in2p3.fr/nof/ & (perso.)
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• Previous message: rene Scholte: "TControlBar"