> (...) > root [0] .L Myclass.C > (...) > root [3] event = new Event(); > (...) > root [6] mytree->Branch("event", "Event", &event, bufsize,split); > Error in <TTree::BranchObject>: Cannot find class:Event > > It seems not to recognize my class Event. Do you have any idea? To me it seems that you meet the limitation that using interpreted class you cannot do ROOT I/O. Most probably you should inherit from TObject and try to use ACLiC. For examples see chapters : "CINT the C++ Interpreter" -> "ACLiC - The Automatic Compiler ..." "Adding a Class" -> "Adding a Class with ACLiC" Jacek.
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