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// Example to write & read a Tree built with a complex class inheritance tree.
// It demonstrates usage of inheritance and TClonesArrays
// This is simplied / stripped extract of an event structure used within the
// Marabou project (http://www.bl.physik.uni-muenchen.de/marabou/html/)
//
//to run this example, do:
// root > .x clonesA_Event.C
void clonesA_Event_w()
{
// protect against old ROOT versions
if ( gROOT->GetVersionInt() < 30503 ) {
cout << "Works only with ROOT version >= 3.05/03" << endl;
return;
}
if ( gROOT->GetVersionDate() < 20030406 ) {
cout << "Works only with ROOT CVS version after 5. 4. 2003" << endl;
return;
}
//write a Tree
TFile *hfile = new TFile("clonesA_Event.root","RECREATE","Test TClonesArray");
TTree *tree = new TTree("clonesA_Event","An example of a ROOT tree");
TUsrSevtData1 *event1 = new TUsrSevtData1();
TUsrSevtData2 *event2 = new TUsrSevtData2();
tree->Branch("top1","TUsrSevtData1",&event1,8000,99);
tree->Branch("top2","TUsrSevtData2",&event2,8000,99);
for (Int_t ev = 0; ev < 10; ev++) {
cout << "event " << ev << endl;
event1->SetEvent(ev);
event2->SetEvent(ev);
tree->Fill();
if (ev <3) tree->Show(ev);
}
tree->Write();
tree->Print();
delete hfile;
}
void clonesA_Event_r()
{
//read the Tree
TFile * hfile = new TFile("clonesA_Event.root");
TTree *tree = (TTree*)hfile->Get("clonesA_Event");
TUsrSevtData1 * event1 = 0;
TUsrSevtData2 * event2 = 0;
tree->SetBranchAddress("top1",&event1);
tree->SetBranchAddress("top2",&event2);
for (Int_t ev = 0; ev < 8; ev++) {
tree->Show(ev);
cout << "Pileup event1: " << event1->GetPileup() << endl;
cout << "Pileup event2: " << event2->GetPileup() << endl;
event1->Clear();
event2->Clear();
// gObjectTable->Print(); // detect possible memory leaks
}
delete hfile;
}
void clonesA_Event() {
gROOT->ProcessLine(".L clonesA_Event.cxx+"); // compile shared lib
clonesA_Event_w(); // write the tree
clonesA_Event_r(); // read back the tree
}
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