Hi roottalk, A class in our reconstruction libraries recently underwent a transition such that one of its data members: mutable map<Int_t,Float_t> fTime[2]; // data member in version 2 became: mutable map<Int_t,Double_t> fTime[2]; // data member in version 3 To support this transition, the class version number was changed from 2 to 3. Automatic schema evolution is used for this class (using the '+' after the class pragma statement in LinkDef.h) and always has been. What we've discovered is that automatic schema evolution doesn't seem to work in this case. When the new class attempts to read objects of the old class version, ROOT's TStreamerInfo complains: Cannot convert CandTrack::fTime from type:map<Int_t,Float_t> to type:map<Int_t,Double_t>, skip element Should automatic schema evolution should support this transition and are there plans to introduce support for this in root? If not, do you recommend making use of a customized streamer to transition this data member? For the above test I used the cvs version of root from 2 weeks ago, and gcc 3.2 on rh linux. Thanks for your help, -Sue
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