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Reference Guide
clonesA_Event.C
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1 /// \file
2 /// \ingroup tutorial_tree
3 ///
4 /// Example to write & read a Tree built with a complex class inheritance tree.
5 /// It demonstrates usage of inheritance and TClonesArrays
6 /// This is simplified / stripped extract of an event structure which was used
7 /// within the Marabou project.
8 ///
9 /// To run this example, do:
10 /// ~~~
11 /// root > .x clonesA_Event.C
12 /// ~~~
13 /// \macro_code
14 ///
15 /// \author The ROOT Team
16 
17 #ifndef CLONESA_EVENT_SECOND_RUN
18 
19 void clonesA_Event() {
20  std::string s1(__FILE__);
21  TString dir = gSystem->UnixPathName(s1.substr(0, s1.find_last_of("\\/")).c_str());
22  gROOT->ProcessLine(TString(".L ")+dir+"/clonesA_Event.cxx+");
23 #define CLONESA_EVENT_SECOND_RUN yes
24  gROOT->ProcessLine("#include \"" __FILE__ "\"");
25  gROOT->ProcessLine("clonesA_Event(true)");
26 }
27 
28 #else
29 
30 void clonesA_Event_w()
31 {
32 // protect against old ROOT versions
33  if ( gROOT->GetVersionInt() < 30503 ) {
34  cout << "Works only with ROOT version >= 3.05/03" << endl;
35  return;
36  }
37  if ( gROOT->GetVersionDate() < 20030406 ) {
38  cout << "Works only with ROOT CVS version after 5. 4. 2003" << endl;
39  return;
40  }
41 
42  //write a Tree
43  TFile *hfile = new TFile("clonesA_Event.root","RECREATE","Test TClonesArray");
44  TTree *tree = new TTree("clonesA_Event","An example of a ROOT tree");
45  TUsrSevtData1 *event1 = new TUsrSevtData1();
46  TUsrSevtData2 *event2 = new TUsrSevtData2();
47  tree->Branch("top1","TUsrSevtData1",&event1,8000,99);
48  tree->Branch("top2","TUsrSevtData2",&event2,8000,99);
49  for (Int_t ev = 0; ev < 10; ev++) {
50  cout << "event " << ev << endl;
51  event1->SetEvent(ev);
52  event2->SetEvent(ev);
53  tree->Fill();
54  if (ev <3) tree->Show(ev);
55  }
56  tree->Write();
57  tree->Print();
58  delete hfile;
59 }
60 
61 void clonesA_Event_r()
62 {
63  //read the Tree
64  TFile * hfile = new TFile("clonesA_Event.root");
65  TTree *tree = (TTree*)hfile->Get("clonesA_Event");
66 
67  TUsrSevtData1 * event1 = 0;
68  TUsrSevtData2 * event2 = 0;
69  tree->SetBranchAddress("top1",&event1);
70  tree->SetBranchAddress("top2",&event2);
71  for (Int_t ev = 0; ev < 8; ev++) {
72  tree->Show(ev);
73  cout << "Pileup event1: " << event1->GetPileup() << endl;
74  cout << "Pileup event2: " << event2->GetPileup() << endl;
75  event1->Clear();
76  event2->Clear();
77  // gObjectTable->Print(); // detect possible memory leaks
78  }
79  delete hfile;
80 }
81 
82 void clonesA_Event(bool /*secondrun*/) {
83  // Embedding this load inside the first run of the script is not yet
84  // supported in v6
85  // gROOT->ProcessLine(".L clonesA_Event.cxx+"); // compile shared lib
86  clonesA_Event_w(); // write the tree
87  clonesA_Event_r(); // read back the tree
88 }
89 
90 #endif
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format...
Definition: TFile.h:48
#define gROOT
Definition: TROOT.h:415
Int_t GetPileup()
Definition: clonesA_Event.h:86
Basic string class.
Definition: TString.h:131
void SetEvent(Int_t ev)
int Int_t
Definition: RtypesCore.h:41
virtual const char * UnixPathName(const char *unixpathname)
Convert from a local pathname to a Unix pathname.
Definition: TSystem.cxx:1046
void Clear(Option_t *="")
Definition: clonesA_Event.h:51
Int_t GetPileup()
Definition: clonesA_Event.h:69
R__EXTERN TSystem * gSystem
Definition: TSystem.h:557
#define s1(x)
Definition: RSha256.hxx:91
TObject * Get(const char *namecycle) override
Return pointer to object identified by namecycle.
void SetEvent(Int_t ev)
Definition: tree.py:1
A TTree represents a columnar dataset.
Definition: TTree.h:72