#include <iostream>
#include "TFile.h"
#include "TTree.h"
#include "TBranch.h"





int main () {
  
  TFile *oldfile = TFile::Open("/afs/cern.ch/work/p/pandolf/public/test_addbranch.root");
  TTree *oldtree = (TTree*)oldfile->Get("treeProducerSusyFullHad");

  TFile *newfile = TFile::Open("/tmp/pandolf/newfile_cpp.root", "RECREATE");
  TTree *newtree = new TTree("mt2", "post processed baby tree for mt2 analysis");
  newtree = oldtree->CloneTree(-1, "fast");
  newtree->SetName("mt2");


  float f1 = 13.;

  TBranch*  b_1 = newtree->Branch("f1",    &f1,     "f1/F");


  Int_t nentries = oldtree->GetEntries();
  for(Int_t i = 0; i < nentries; i++) {
    if( i % 100000 == 0 ) std::cout << "Entry " << i << " / " << nentries << std::endl;
    b_1->Fill();
  }
  
  
  delete oldtree;
  oldfile->Close();
  
  newtree->Write();
  newfile->Close();

  return 0;

}