#include <TROOT.h>
#include <TFile.h>
#include <TTree.h>
#include <TRandom3.h>

#include <iostream>
using namespace std;

class myClass {
private:
  Double_t val1;
  Float_t val2;

public:
  virtual ~myClass() {;}

  void SetVal1(Double_t val) {
    val1 = val;
  }
  void SetVal2(Float_t val) {
    val2 = val;
  }

  ClassDef(myClass,1); // myclass
};

void complextree3() {
  myClass *obj0 = new myClass();

  TFile *file = new TFile("complextree3.root","recreate");
  TTree *tree = new TTree("tree","Data tree");

  tree->Branch("data0",&obj0,8000,1);

  for (Int_t i=0;i<1000;++i) {
    obj0->val1 = gRandom->Gaus();
    obj0->val2 = gRandom->Poisson(1);
    tree->Fill();
    cout << '\r' << i << flush;
  }
  cout << endl;

  tree->Write();
  file->Close();

  file->Open("complextree3.root");
}