Pointers of branch objects inside a TObjArray

Hello rooters,

Suppose I have a TTree with N branches containing the same type of objects. If I store the pointers to these objects into an array, like:

• DCCTower *fTow[70]; //All towers

and if I give the address of these pointers to TTree::SetBranchAddress() by:

• void *pa;
• pa = &fTow[k];
• fTree->SetBranchAddress(branchname[k].Data(), pa);

everything goes fine. If now the pointers to the towers are NOT in an array, but are in a TObjArray, and if I give to SetBranchAddress the address of those pointers in a TObjArray, ROOT crashes at the call to TBranch::GetEntry(). I only succeeded in making the pointers reintegrate the TObjArray by first getting them into the array fTow, and then inserting them into the TObjArray by the method TObjArray::AddAt(). Is it a feature or do I do something wrong?

Thanks a lot in advance.

F.X.Gentit

DAPNIA/SPP CEA Saclay

http://gentit.home.cern.ch/gentit/