TChain vs TTree

From: Laurent Aphecetche (aphecetche@ganil.fr)
Date: Mon Apr 20 1998 - 12:50:04 MEST 

Hi,


I would like to transform a program using TTree to a program using
TChain. Basically,
to read my TTree, I do :

TBranch* small = T.GetBranch("small_branch");
TBranch* big = T.GetBranch("the_whole_event") ;

 for (Int_t i=0;i<nevent;i++) {
      small->GetEvent(i);
      if (big->IsNoGood()) continue;
      T.GetEvent(i); //read complete accepted event in memory
   }

I do not see cleary how this could be done with chains. Should I disable
all branches but the small one, read the event, and then, if ok, enable
the other branches, and read again the same event ?
Or is another way ?

Thanks.
-- 
APHECETCHE Laurent (mailto:aphecetche@ganil.fr)       
GANIL, B.P. 5027, 14076, Caen Cedex 5, France 
Vox: +33 (0)2 31 45 45 85 - Fax: +33 (0)2 31 45 46 65         
WWW: http://ganp03.in2p3.fr/nof/ & (perso.)
http://www.mygale.org/~p0mp0n

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