Hi Fred, You can either modify the constructor of the generated class. to contains something along the line (this comes from a MakeClass generated from a TChain): TChain * chain = new TChain("treename",""); chain->Add("file.root"); tree = chain; Or you can do it before instantiate the object and passed as a parameter: TChain * chain = new TChain("treename",""); chain->Add("file.root"); MadeByMakeClass m(chain); m.Loop(); Cheers, Philippe. -----Original Message----- From: owner-roottalk@pcroot.cern.ch [mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Fred Sarazin Sent: Friday, September 27, 2002 5:44 PM To: roottalk@pcroot.cern.ch Subject: [ROOT] TChain after a TTree::MakeClass() call ? Hello, I generated a class with TTree::MakeClass(). If I want the Loop() method to inspect trees of same structure located in different files, where do I declare the TChain and its elements and how do I relate it to TTree *fChain ? Thanks, Fred
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