Here is a list of all namespace members with links to the namespace documentation for each member:

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• ObjClass : xmlio
• Object : xmlio
• ObjectHandling : RooFit
• ObjectIDToColor() : Rgl
• ObjectInst : sqlio
• ObjectName() : RooFit
• ObjectProxy_Check() : PyROOT
• ObjectProxy_CheckExact() : PyROOT
• ObjectProxy_Type : PyROOT
• ObjectPtr : sqlio
• ObjectRef : sqlio
• ObjectRef_Arr : sqlio
• ObjectsTable : sqlio
• ObjectsTableIndex : sqlio
• ObjectSuffix : sqlio
• ObjectUUID : xmlio
• Odd() : TMath
• Offset() : RooFit
• OnlyVersion : xmlio
• op_dealloc_nofree() : PyROOT
• open : ROOT::Math::detail
• OpenFile() : TMVA::TMVAGlob
• operator &() : ROOT::Experimental::Hist , TMVA::DNN
• operator &=() : TMVA::DNN
• operator!=() : ROOT::Experimental::Internal , ROOT::Experimental
• operator*() : ROOT::Math::Impl , ROOT::Math , ROOT::Minuit2
• operator+() : ROOT::Math , ROOT::Minuit2
• operator-() : ROOT::Math , ROOT::Minuit2
• operator/() : ROOT::Math , ROOT::Minuit2
• operator<() : Memstat , ROOT::Experimental::Internal , ROOT::Experimental , TMVA
• operator<<() : RooFit , ROOT::Fit , ROOT::Math::detail , ROOT::Math::Impl , ROOT::Math , ROOT::Minuit2 , TMVA::kNN , TMVA
• operator<=() : ROOT::Experimental::Internal , ROOT::Experimental
• operator==() : ROOT::Experimental::Internal , ROOT::Experimental
• operator>() : ROOT::Experimental::Internal , ROOT::Experimental
• operator>=() : ROOT::Experimental::Internal , ROOT::Experimental
• operator>>() : ROOT::Math::detail , ROOT::Math , TMVA
• operator|() : TMVA::DNN
• operator|=() : TMVA::DNN
• Optimization : RooFit
• Optimize() : RooFit
• optimizer : ClassificationKeras , GenerateModel , MulticlassKeras , RegressionKeras
• OptionsMap : ROOT::Math
• OT_Class : sqlio
• OT_Version : sqlio
• Outer_prod() : ROOT::Minuit2
• Outer_product() : ROOT::Minuit2
• output : ClassificationKeras , MulticlassKeras , RegressionKeras
• OutputFile() : RooFit
• OutputStream() : RooFit
• OwnLinked() : RooFit
• TObjectBits : sqlio
• TObjectProcessId : sqlio
• TObjectUniqueId : sqlio
• ToConstCharPtr() : ROOT::Internal::TDF
• ToHumanReadableSize() : ROOT
• Topic() : RooFit
• ToString() : ROOT::Math::Util