Hi,
why can't I create a branch clones object with the following code:
{
// a test for ClonesArrays
gSystem.Load("$ROOTSYS/lib/libPhysics.so");
gSystem.Load("$ROOTSYS/lib/libProof.so");
TClonesArray a("TLorentzVector", 10);
Int_t j;
TFile * f = new TFile("test.root", "RECREATE");
TTree * t = new TTree("tt", "test tree");
cout << t->Branch("j", & j, "j/I", 2048) << endl; // ok!
cout << t->Branch("a", & a, 2048, 1) << endl; // nil - but why?
for (j = 0; j < 2049; j++) {
for (Int_t i = 0; i < 10; i++) {
new(a[i]) TLorentzVector;
}
t->Fill();
a.Clear();
}
t->Write();
f->Close();
delete f;
}
The file "test.root" only contains a branch for j, but not for the
ClonesArray. Why does it work e.g. in the "Event" example, where the
ClonesArray is a member of the class Event?
ROOT version: 2.23/09
setenv ROOTSYS "/afs/cern.ch/na49/library.4/ROOT/new/i386_redhat51/root"
Martin
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