Hi, I'm trying to write a macro with a very basic tree. I first load a simple class called Mytest, which contains just 4 variables with .L help.cpp. It has the following form: #include "help.h" Mytest::Mytest() { } Mytest::~Mytest() { } void Mytest::Streamer(TBuffer &R__b) { // Stream an object of class Geometry. } where help.h has the form: class Mytest { public: Mytest(); virtual ~Mytest(); void Streamer(TBuffer& R__b); Int_t Run_number; Int_t Record_number; Int_t Fill_number; Int_t Nrhits; }; I'm booking the tree then the following way: { TFile *hfile = new TFile("Test.root","RECREATE","Junk"); TTree *treetrace = new TTree("treetrace","example",1024); Int_t split=0; Int_t bsize = 64000; Mytest *mytest = new Mytest; treetrace->Branch("mytest","Mytest",&mytest,bsize,split); treetrace->Fill(); } At the comand treetrace->Fill() I get a segmentation violation. What could the reason be? I'm running this on a hp system 10. cheers David
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