Olivier Meplan wrote: > > Hi rooters! > > I have a question about increasing the id of ClassDef ; I add members to > a existing class > but I want to be able to read older objects of this class. I understood > that I have to modify the streamer function to take that into account in > the Dictonary file. I have done that and all seems to work but is there > a way to do that automatically (because in the make file I use, the > dictonary file is automatically generated without the modification > if(R__v>1){...}? > Thanks a lot > Olivier Meplan Hi Olivier, By definition, this process cannot be automatized. You should follow the following steps: - Increase class version in ClassDef - Take a copy of your old Streamer in the dictionary and add this function in your class implementation. - Modify your Linkdef.h file to add the symbol "-" after the class name This instructs rootcint to not generate the Streamer function. - run rootcint with the new Linkdef. For more info, see URL: http://root.cern.ch/root/RootCintMan.html Rene Brun
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