Hi Robert, The keywords "left" and "right" are manipulators used by C++ iostream see: http://www.cplusplus.com/ref/iostream/ios_base/_internal_left_right.html Rene Brun Robert Michaels wrote: > > Using ROOT 3.10/02 compiled with gcc 3.2.3 on a RHEL 3WS. > The following example illustrates my problem. It is minor > but I am wondering why this occured for this newer version > of root ? For some earlier versions of root it was not a > problem. Is it a new bug ? > > thanks > Robert Michaels > Jefferson Lab > > { > // This macro: tsimple.C > // > // Why in this example must I have "R" instead > // of "right" as the 1st argument of TTree ? > // right->Print`() fails > // but if I replace "right" by "R", then > // R->Print() succeeds > > // This problem occurs on a RH enterprise 3WS > // with ROOT version 3.10/02 compiled with gcc 3.2.3 > // kernel 2.4.21-9.0.1.EL > // > // Most relevant is ROOT version, since 3.05/07 > // compiled with same compiler on same system > // right->Print() works fine. > // Some earlier versions also work (3.02/07, 3.03/06). > > gROOT->Reset(); > > Double_t px, py, ev, bb; > Int_t kout = 5000; > > TFile *hfile = new TFile("t.root","RECREATE","Demo"); > > // The following works ok -- can do "R->Print()" > // TTree *tree = new TTree("R","simple tree"); > > // But this does not work: > TTree *tree = new TTree("right","simple tree"); > > // Failure: > // root [0] .x tsimple.C > // root [1] right->Print() > //Error: non class,struct,union object right used with . or -> FILE:(tmpfile) LINE:1 > //*** Interpreter error recovered *** > // So you must: > // root [2] TTree *R = (TTree*)gROOT.FindObject("right") > // root [3] R->Print() > // (no error now) > > tree->Branch("px",&px,"px/D",kout); > tree->Branch("py",&py,"py/D",kout); > tree->Branch("ev",&ev,"ev/D",kout); > tree->Branch("bb",&bb,"bb/D",kout); > > > // Fill tree randomly > gRandom->SetSeed(); > > for (Int_t i = 0; i < 5000; i++) { > gRandom->Rannor(px,py); > ev = ev+1; > bb = 40*ev+1000; > tree->Fill(); > } > > tree->Write(); > > }
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