int counter=0;

void prog(void) 
{
  TH1F h2;
  h2=getH();

  TH1F h3;
  h3=getH();
}


TH1F getH(void)
{ 
  // write out adress of h1
  // in C++ this must not work because 'h1' is not defined yet!!
  if (counter>0) {
    cout << h1 << endl;
  }

  // create new histogramm as object, not pointer
  int size=100;
  TH1F h1("h1","h1",size,1,size+1);

  for (int i=1;i<size;i++) {
    h1.SetBinContent(i,i);
  }

  // increase counter
  counter++;

  // return object
  return h1;
}