#include <string>
#include <vector>
#include <fstream>
#include <iostream>
#include <math.h>
#include <TFile.h>
#include <TDirectory.h>
#include <TCollection.h>
#include <TH1.h>
#include <TH2.h>
#include <TKey.h>
#include <TROOT.h>
#include <TClass.h>
#include <Riostream.h>

// function declarations_________________________________________________________________
void readDir(TDirectory *dir);
//_______________________________________________________________________________________
void readDir(TDirectory *dir)
//void script_Brun(TDirectory *dir)
{
   TDirectory *dirsav = gDirectory;
   TDirectory *currentDir = gDirectory;
   TIter next(dir->GetListOfKeys());
   TKey *key;
   while ((key = (TKey*)next()))
   {
      // if the Key is a folder read the directory and skip the rest of the block
      if (key->IsFolder()) {
         dir->cd(key->GetName());
         currentDir = gDirectory;
         readDir(currentDir);
		 //script_Brun(currentDir);
         dirsav->cd();
         continue;
      }
      // so the key is not a folder
      TClass *cl = gROOT->GetClass(key->GetClassName());
      if (!cl->InheritsFrom("TH1")) continue;
      std::string histname = key->GetName();
	  //cout << "key->GetName(): " << histname.c_str() << endl;
      size_t pos = histname.find("_uncorr");

      if(pos!= string::npos){
         std::string name_to_find = histname.substr(0,pos);
         TH1 *hist_to_find = (TH1*)key->ReadObj();
         
         // AS SOON AS YOU UNCOMMENT THE NEXT LINE SCRIPT will not CRASH
         //if(hist_to_find) {
			//std::cout << hist_to_find->GetName();	
		//	hist_to_find->Draw();
         //}
		 std::cout << "some output" << std::endl;
      }
   }
}