Hi Mathieu, TRef is a good candidate for your problem. We give an example in $ROOTSYS/test/Event.h Rene Brun Mathieu Ribordy wrote: > > Hi, > > I have events that I store in a TTree. > > Now multiple events in the tree points to the same calibration/geometry > object and to the same history (events undergo multiple > reconstruction,...) and to the same run header. > > Then, I do not want to repeat those informations in each event, but I > want to refer to them. How may I do such things (e.g. I'm not sure a can > refer to a specific element of an other tree or use global TRef) ? > > Thanks for any help, > > Mathieu Ribordy
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