// Note: one MUST use this code as (pre)compiled (e.g. by ACLiC) because
//       the "storage" class inherits from a compiled class ("TObject"):
//       root [0] .L breakingExample.C++
//       root [1] breakingExampleWrite();
//       root [2] breakingExampleRead();
//

#include <iostream>

#include <TFile.h>
#include <TTree.h>
#include <TTimeStamp.h>
#include <TRandom.h>

class storage : public TObject
{
public:
  TTree* tree;

  storage() { tree = 0; }

  ClassDef(storage, 1); // my storage class
};

void breakingExampleWrite()
{
   TTimeStamp time;
   Double_t value;
   TFile* file = new TFile("tmp.root", "recreate");
   auto tree = new TTree("tree", "tree");
   tree->Branch("Time", &time);
   tree->Branch("Value", &value);

   const int nEvents = 10000000;
   TTimeStamp lastSave;
   for(long i = 0; i < nEvents; ++i) {
       time = TTimeStamp();
       value = gRandom->Uniform(-10., 10.);
       tree->Fill();
       if (time.AsDouble() - lastSave.AsDouble() > 10)
       {
         printf("saving...\n");
         tree->AutoSave("SaveSelf");
         lastSave = time;
       }
   }
   tree->AutoSave("SaveSelf FlushBaskets");
   tree->Write();
   delete file;

   file = new TFile("tmp.root");
   tree = (TTree*)file->Get("tree");

   auto fout = new TFile("final.root", "recreate");
   storage stor;
   stor.tree = tree->CloneTree();
   stor.Write("storage");
   delete fout;
   delete file;
}

void breakingExampleRead()
{
    auto file = new TFile("final.root");
    auto stor = (storage*)file->Get("storage");
    stor->tree->Print();
    stor->tree->Show(22);
    stor->tree->Scan();
    delete file;
}