Hi Jacek, You do not identify which version you use. I assume the production version 3.01/05. The constructor should be called only once. Remember that you must pass the address of a pointer, not the pointer itself. In your case, you should do: tree = new TTree("WireMap", "WireMap"); WireInfo *globalWireInfo = new WireInfo(); tree->Branch("WireInfo", "WireInfo", &globalWireInfo); or tree = new TTree("WireMap", "WireMap"); WireInfo *globalWireInfo = 0; //must be set to 0 tree->Branch("WireInfo", "WireInfo", &globalWireInfo); Rene Brun Jacek M. Holeczek wrote: > > Hi, > I think I suffer from the following problem. If I do : > tree = new TTree("WireMap", "WireMap"); > tree->Branch("WireInfo", "WireInfo", globalWireInfo); > then the "default" constructor of the class WireInfo is called TWO times > somewhere inside "tree->Branch". This breaks my whole application. > Can I somehow prevent this ? > Thanks in advance, > Jacek.
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