On using a TList to store TH1 / TGraph objects?

ROOT
5

Okay, got it. I didn’t realize the TGraphs are never attached to the file. I post my code in case someone has a similar question in the future.

TList *GetObjects(char *filename)
{
  TH1 *histo;
  TGraph *graph;
  TList *myObjects = new TList();
  myObjects->SetName("myObjects");

  TFile *f = new TFile(filename);
  TIter next(f->GetListOfKeys());
  TKey *key;
  while (key = (TKey*)next()) {
    TClass *cl = gROOT->GetClass(key->GetClassName());
    if (cl->InheritsFrom("TH1")) { 
      histo = (TH1*)key->ReadObj();
      histo->SetDirectory(0);
      myObjects->Add(histo);
    }
    else if (cl->InheritsFrom("TGraph")) {
      graph = (TGraph*)key->ReadObj();
      myObjects->Add(graph);
    }
  }
  f->Close();

  return myObjects;
}