Hi, All, I have a class that I have been allowing ROOT to generate Streamers for: class X { X(); X( const X & ); private: TH1F * x; TH1F * y; ClassDef(X,1) }; Now, I need to extend the class to have an array for "x" and "y": class X { X(); X( const X &); enum Number_t { N=0, N_NUMBER_TYPES }; private: TH1F* x[N]; TH1F* y[N]; ClassDef(X,2) }; Will the automatic Streamer generator be able to pick up this change? I imagine not. So if not, what is the order of the variables streamed in the automatic Streamer? Is there a version number written out? I imagine it to be: version >> x >> y; but I can't really be sure. The automatic generation looks like: void X::Streamer( TBuffer &R__b) { // Stream an object of class X. if (R__b.IsReading()) { X::Class()->ReadBuffer(R__b, this); } else { X::Class()->WriteBuffer(R__b, this); } } so I can't figure out the order of the objects read in and out are. After I know the order, it is of course trivial to write a streamer to handle both versions, but I can't figure out what the order is. Thanks, Sal Rappoccio
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